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A Study of Open Charm Produc5on in p+p Collisions at STAR
David TlustyNuclear Physics Ins5tute AS CR
Czech Technical University Prague
ICHEP 14, 04/07/2014 Heavy Flavor at STAR, R. Vértesi 1
Heavy Flavor Measurements at STAR
Nuclear Physics Institute Academy of Sciences of the Czech Republic
Róbert Vértesi
robert.vertesi@ujf.cas.cz .
for the
collaboration
l+
i_l
D0
_K /+
D0
cc
9.6%
3.89%
56.5%
56.5%
_
K
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
Introduc5on
2
ICHEP 14, 04/07/2014 Heavy Flavor at STAR, R. Vértesi 4
1. Open heavy flavor
Open Charm Production – D* Reconstruction -
9
)2) (GeV/c/)-M(K//M(K0.14 0.145 0.15 0.155 0.16 0.165
Cou
nts
0
500
1000
1500
2000
2500
right sign
wrong sign
side band
)2) (GeV/c/M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05
Cou
nts
0
200
400
600
800
1000
1200
1400
1600
1800
2000
candidates0 D
side band
dE/d
x/
mn
-5
0
5
10 (a)pK
/
edE
/dx
Kmn
-5
0
5
10 (b)
K
p
/
Momentum (GeV/c)0 1 2 3 4 5
TOF
Kmn
-20
-10
0
10(c)
K
/
p
D0
K- π+
D*+
π+
p+p 200 GeV
Quark Matter 2014, Zhenyu Ye STAR: PRD 86, 072013 (2012)
! Heavy quarks c, b ! Produced in initial hard processes ! Probe the strongly interacting Quark–Gluon Plasma ! Modified spectrum: access parton energy loss ! Flow: sensitive to dynamics, thermalization
! Semi-leptonic decays ! Higher branching ratio, easy to trigger on ! Indirect access to kinematics,
mixture of c and b contributions
! Hadronic reconstruction ! Direct access to kinematics ! Large combinatorial bg., difficult to trigger
April 8, 2014 WWND
Heavy quarks
✓ c and b quarks are produced in initial hard scattering
3
• Degree of medium thermalization – production and elliptic 4ow sensitive to dynamics of the medium
• Parton energy loss mechanism
• Cross-sections calculable within pQCD
• Unique probes of QGP properties
★Heavy Quarks c, b★produced in ini5al hard processes★produc5on well described by pQCD ★excellent probe of the strongly interac5ng Quark-‐Gluon Plasma
l+
i_l
D0
_K /+
D0
cc
9.6%
3.89%
56.5%
56.5%
_
K
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
Introduc5on
«Direct reconstruc5on of open charm mesons
2
ICHEP 14, 04/07/2014 Heavy Flavor at STAR, R. Vértesi 4
1. Open heavy flavor
Open Charm Production – D* Reconstruction -
9
)2) (GeV/c/)-M(K//M(K0.14 0.145 0.15 0.155 0.16 0.165
Cou
nts
0
500
1000
1500
2000
2500
right sign
wrong sign
side band
)2) (GeV/c/M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05
Cou
nts
0
200
400
600
800
1000
1200
1400
1600
1800
2000
candidates0 D
side band
dE/d
x/
mn
-5
0
5
10 (a)pK
/
edE
/dx
Kmn
-5
0
5
10 (b)
K
p
/
Momentum (GeV/c)0 1 2 3 4 5
TOF
Kmn
-20
-10
0
10(c)
K
/
p
D0
K- π+
D*+
π+
p+p 200 GeV
Quark Matter 2014, Zhenyu Ye STAR: PRD 86, 072013 (2012)
! Heavy quarks c, b ! Produced in initial hard processes ! Probe the strongly interacting Quark–Gluon Plasma ! Modified spectrum: access parton energy loss ! Flow: sensitive to dynamics, thermalization
! Semi-leptonic decays ! Higher branching ratio, easy to trigger on ! Indirect access to kinematics,
mixture of c and b contributions
! Hadronic reconstruction ! Direct access to kinematics ! Large combinatorial bg., difficult to trigger
April 8, 2014 WWND
Heavy quarks
✓ c and b quarks are produced in initial hard scattering
3
• Degree of medium thermalization – production and elliptic 4ow sensitive to dynamics of the medium
• Parton energy loss mechanism
• Cross-sections calculable within pQCD
• Unique probes of QGP properties
★Heavy Quarks c, b★produced in ini5al hard processes★produc5on well described by pQCD ★excellent probe of the strongly interac5ng Quark-‐Gluon Plasma
STAR%Detector%System%%TPC#MTD#Magnet# BEMC# BBC#EEMC# TOF#
HFT#
6/19/14% RHC(AGS%users%meeDng% 7%David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
The STAR Detector
3
EEMC TOFTPCBEMCMTDMagnet
STAR%Detector%System%%TPC#MTD#Magnet# BEMC# BBC#EEMC# TOF#
HFT#
6/19/14% RHC(AGS%users%meeDng% 7%David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
The STAR Detector
« VPD: minimum bias trigger
3
EEMC TOFTPCBEMCMTDMagnet
STAR%Detector%System%%TPC#MTD#Magnet# BEMC# BBC#EEMC# TOF#
HFT#
6/19/14% RHC(AGS%users%meeDng% 7%David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
The STAR Detector
« VPD: minimum bias trigger
« TPC: par4cle iden4fica4on, momentum
3
EEMC TOFTPCBEMCMTDMagnet
STAR%Detector%System%%TPC#MTD#Magnet# BEMC# BBC#EEMC# TOF#
HFT#
6/19/14% RHC(AGS%users%meeDng% 7%David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
The STAR Detector
« VPD: minimum bias trigger
« TPC: par4cle iden4fica4on, momentum
« TOF: par4cle iden4fica4on (4me resolu4on 110 ps in p+p, 87 ps in Au+Au)
3
EEMC TOFTPCBEMCMTDMagnet
STAR%Detector%System%%TPC#MTD#Magnet# BEMC# BBC#EEMC# TOF#
HFT#
6/19/14% RHC(AGS%users%meeDng% 7%David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
The STAR Detector
« VPD: minimum bias trigger
« TPC: par4cle iden4fica4on, momentum
« TOF: par4cle iden4fica4on (4me resolu4on 110 ps in p+p, 87 ps in Au+Au)
« BEMC: high-‐energy trigger, electron iden4fica4on
3
EEMC TOFTPCBEMCMTDMagnet
0 1 2 3 4 5
1
2
p [GeV/c ]
ln(dE/dx
)ln
keVcm
!1 TPC PID
0.5 1 1.5 2 2.5 31
2
3
4
1/!
p [GeV/c ]
protons
kaonspions
1/! =ctL
t from TOFL from TPC
1/!m2
p2+ 1
criterium of PID
Energy 200 GeV 500 GeV 500 GeVTrigger VPDMB VPDMB BHT1# events 105M 51M 111M�pp 30± 3.5 mb 34± 4 mb 6± 1 µb
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
Daughter Par5cle Iden5fica5on
4
TOF provides clean sample of kaons with momentum up to ∼1.6 GeV/c
kaon -‐ pion separa5on be\er by TPC than by TOF for track with momentum above ∼2.5 GeV/c
0 1 2 3 4 5
1
2
p [GeV/c ]
ln(dE/dx
)ln
keVcm
!1 TPC PID
0.5 1 1.5 2 2.5 31
2
3
4
1/!
p [GeV/c ]
protons
kaonspions
1/! =ctL
t from TOFL from TPC
1/!m2
p2+ 1
criterium of PID
Energy 200 GeV 500 GeV 500 GeVTrigger VPDMB VPDMB BHT1# events 105M 51M 111M�pp 30± 3.5 mb 34± 4 mb 6± 1 µb
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
Daughter Par5cle Iden5fica5on
4
TOF provides clean sample of kaons with momentum up to ∼1.6 GeV/c
kaon -‐ pion separa5on be\er by TPC than by TOF for track with momentum above ∼2.5 GeV/c
ln(dE/dx) [ln(keV/cm)]0.6 0.8 1 1.2 1.4 1.6 1.8
1
10
210
310 protonskaonspionselectrons
4.5 < p < 5 GeV/c
]2 [GeV/c/KM1.75 1.8 1.85 1.9 1.95 2 2.05
)2R
aw Y
ield
(/10
MeV
/c
-1-0.5
00.5
11.5
22.5
33.5
310=
1016(RwYld = 4584 /ndf = 27.426/332r
0.003( = 1.865 +
0.0025( = 0.0112 m
]2 [GeV/c/KM0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4
0
5
10
)2R
aw Y
ield
(/10
MeV
/c
15
20
410=
0 1 2 3 4 5 6 7 8 9 10 11Unlike-Sign (left scale)
Like-Sign (left scale)Rotated Momentum (left scale)Unlike – Like (right scale)Unlike – Rotated (right scale)
]2 [GeV/c/KM1.75 1.8 1.85 1.9 1.95 2 2.05
)2R
aw Y
ield
(/10
MeV
/c
-1-0.5
0
0.51
1.5
22.5
33.5
310=
996(RwYld = 3564 /ndf = 17.643/332r
0.003( = 1.866 +
0.0029( = 0.0110 m
410=
1 < pT(K/) < 2 GeV/c-1 < y(K/) < 1
K0*(892)
K2*(1430) D0(1865)
VPDMBp+p @ 500 GeV
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
D0 Meson Reconstruc5on
5
D0
K−
π+
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
D* Meson Reconstruc5on
6
wrong-sign method was included in the systematic uncer-tainties. Details in determining the uncertainties on the rawD! yields including the double-counting effect will bediscussed in Sec. VA. The D! raw yields are summarizedin Table II.
To obtain the cross section, the event-selection criteriadescribed in the previous section were applied. The rawdistributions were further divided into pT slices to obtainthe raw D! yields in each pT bin. Figure 8 shows the D!
candidates and background distributions in different pT
bins. The bottom panel on each plot was generated bysubtracting the sideband background from the right-signcandidates. The mean and width from Gaussian fits arecompared with MC simulation in the right panel of Fig. 6,
and it shows the obtained D! peak positions and widthsagree with the MC simulation well. From this analysis, thetotal signal consisted of 364" 68 counts, and the raw yieldratio of D!#=D!$ is 0:93" 0:37.
IV. EFFICIENCYAND TRIGGER OR VERTEXBIAS CORRECTION
The final charmed-hadron cross section in p$ p colli-sions is calculated as follows:
Ed3!
dp3 % 1
2"& 1
#rec& 1
BR& !ND
pT!pT!y& !NSD
NMB& ftrg;vtx; (3)
where !NSD is the total nonsingly diffractive (NSD) crosssection, which is measured at STAR to be 30:0" 2:4 mb[30].NMB is the total number of minimum-bias events usedfor the analysis. !ND is the raw charmed-hadron signal ineach pT bin within a rapidity window !y. BR is thehadronic decay branching ratio for the channel of interest.There are two correction factors: #rec, which is the recon-struction efficiency including geometric acceptance, trackselection efficiency, PID efficiency, and analysis cut effi-ciency; and ftrg;vtx'pT(, which is the correction factor to
)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165
Cou
nts
0
500
1000
1500
2000
2500
right sign
wrong sign
sideband
)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05
Cou
nts
0
200
400
600
800
1000
1200
1400
1600
1800
2000
candidates0 D
sideband
FIG. 7 (color online). Upper: Raw D! candidate signal fromthe right-sign combinations in all p$ p minimum-biasevents. Histograms are combinatorial background distributionsfrom wrong-sign and sideband methods. Lower: Raw D0
candidates after requiring the D! candidate cut (0:144<!M<0:147 GeV=c2).
TABLE II. D! raw yields.
pT range (GeV=c) 2–3 3–4 4–5 5–6
pT (GeV=c) 2.45 3.44 4.45 5.45Raw yields 209" 58 98" 35 27" 11 12:3" 4:1
Cou
nts
100
200
300
400
500
600 <3GeV/cT
2<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
50
100RS-SB
Cou
nts
20
40
60
80
100 <4GeV/cT
3<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
20
40 RS-SB
Cou
nts
5
10
15
20
25
30<5GeV/c
T4<p right sign (RS)
wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
-5
0
5
10
15 RS-SB
Cou
nts
2
4
6
8
10
12 <6GeV/cT
5<p right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
5
RS-SB
FIG. 8 (color online). Raw D! signals in different pT bins.In each plot, the bottom panel distribution is generated bysubtracting the sideband background from the right-sign distri-bution. Variable binning is used in the bottom panel for betterillustration.
L. ADAMCZYK et al. PHYSICAL REVIEW D 86, 072013 (2012)
072013-8
Phys. Rev. D 86, 72013a)
b)
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
D* Meson Reconstruc5on
6
wrong-sign method was included in the systematic uncer-tainties. Details in determining the uncertainties on the rawD! yields including the double-counting effect will bediscussed in Sec. VA. The D! raw yields are summarizedin Table II.
To obtain the cross section, the event-selection criteriadescribed in the previous section were applied. The rawdistributions were further divided into pT slices to obtainthe raw D! yields in each pT bin. Figure 8 shows the D!
candidates and background distributions in different pT
bins. The bottom panel on each plot was generated bysubtracting the sideband background from the right-signcandidates. The mean and width from Gaussian fits arecompared with MC simulation in the right panel of Fig. 6,
and it shows the obtained D! peak positions and widthsagree with the MC simulation well. From this analysis, thetotal signal consisted of 364" 68 counts, and the raw yieldratio of D!#=D!$ is 0:93" 0:37.
IV. EFFICIENCYAND TRIGGER OR VERTEXBIAS CORRECTION
The final charmed-hadron cross section in p$ p colli-sions is calculated as follows:
Ed3!
dp3 % 1
2"& 1
#rec& 1
BR& !ND
pT!pT!y& !NSD
NMB& ftrg;vtx; (3)
where !NSD is the total nonsingly diffractive (NSD) crosssection, which is measured at STAR to be 30:0" 2:4 mb[30].NMB is the total number of minimum-bias events usedfor the analysis. !ND is the raw charmed-hadron signal ineach pT bin within a rapidity window !y. BR is thehadronic decay branching ratio for the channel of interest.There are two correction factors: #rec, which is the recon-struction efficiency including geometric acceptance, trackselection efficiency, PID efficiency, and analysis cut effi-ciency; and ftrg;vtx'pT(, which is the correction factor to
)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165
Cou
nts
0
500
1000
1500
2000
2500
right sign
wrong sign
sideband
)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05
Cou
nts
0
200
400
600
800
1000
1200
1400
1600
1800
2000
candidates0 D
sideband
FIG. 7 (color online). Upper: Raw D! candidate signal fromthe right-sign combinations in all p$ p minimum-biasevents. Histograms are combinatorial background distributionsfrom wrong-sign and sideband methods. Lower: Raw D0
candidates after requiring the D! candidate cut (0:144<!M<0:147 GeV=c2).
TABLE II. D! raw yields.
pT range (GeV=c) 2–3 3–4 4–5 5–6
pT (GeV=c) 2.45 3.44 4.45 5.45Raw yields 209" 58 98" 35 27" 11 12:3" 4:1
Cou
nts
100
200
300
400
500
600 <3GeV/cT
2<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
50
100RS-SB
Cou
nts
20
40
60
80
100 <4GeV/cT
3<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
20
40 RS-SB
Cou
nts
5
10
15
20
25
30<5GeV/c
T4<p right sign (RS)
wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
-5
0
5
10
15 RS-SB
Cou
nts
2
4
6
8
10
12 <6GeV/cT
5<p right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
5
RS-SB
FIG. 8 (color online). Raw D! signals in different pT bins.In each plot, the bottom panel distribution is generated bysubtracting the sideband background from the right-sign distri-bution. Variable binning is used in the bottom panel for betterillustration.
L. ADAMCZYK et al. PHYSICAL REVIEW D 86, 072013 (2012)
072013-8
Phys. Rev. D 86, 72013a)
b)
D0
K−π+
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
D* Meson Reconstruc5on
6
wrong-sign method was included in the systematic uncer-tainties. Details in determining the uncertainties on the rawD! yields including the double-counting effect will bediscussed in Sec. VA. The D! raw yields are summarizedin Table II.
To obtain the cross section, the event-selection criteriadescribed in the previous section were applied. The rawdistributions were further divided into pT slices to obtainthe raw D! yields in each pT bin. Figure 8 shows the D!
candidates and background distributions in different pT
bins. The bottom panel on each plot was generated bysubtracting the sideband background from the right-signcandidates. The mean and width from Gaussian fits arecompared with MC simulation in the right panel of Fig. 6,
and it shows the obtained D! peak positions and widthsagree with the MC simulation well. From this analysis, thetotal signal consisted of 364" 68 counts, and the raw yieldratio of D!#=D!$ is 0:93" 0:37.
IV. EFFICIENCYAND TRIGGER OR VERTEXBIAS CORRECTION
The final charmed-hadron cross section in p$ p colli-sions is calculated as follows:
Ed3!
dp3 % 1
2"& 1
#rec& 1
BR& !ND
pT!pT!y& !NSD
NMB& ftrg;vtx; (3)
where !NSD is the total nonsingly diffractive (NSD) crosssection, which is measured at STAR to be 30:0" 2:4 mb[30].NMB is the total number of minimum-bias events usedfor the analysis. !ND is the raw charmed-hadron signal ineach pT bin within a rapidity window !y. BR is thehadronic decay branching ratio for the channel of interest.There are two correction factors: #rec, which is the recon-struction efficiency including geometric acceptance, trackselection efficiency, PID efficiency, and analysis cut effi-ciency; and ftrg;vtx'pT(, which is the correction factor to
)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165
Cou
nts
0
500
1000
1500
2000
2500
right sign
wrong sign
sideband
)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05
Cou
nts
0
200
400
600
800
1000
1200
1400
1600
1800
2000
candidates0 D
sideband
FIG. 7 (color online). Upper: Raw D! candidate signal fromthe right-sign combinations in all p$ p minimum-biasevents. Histograms are combinatorial background distributionsfrom wrong-sign and sideband methods. Lower: Raw D0
candidates after requiring the D! candidate cut (0:144<!M<0:147 GeV=c2).
TABLE II. D! raw yields.
pT range (GeV=c) 2–3 3–4 4–5 5–6
pT (GeV=c) 2.45 3.44 4.45 5.45Raw yields 209" 58 98" 35 27" 11 12:3" 4:1
Cou
nts
100
200
300
400
500
600 <3GeV/cT
2<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
50
100RS-SB
Cou
nts
20
40
60
80
100 <4GeV/cT
3<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
20
40 RS-SB
Cou
nts
5
10
15
20
25
30<5GeV/c
T4<p right sign (RS)
wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
-5
0
5
10
15 RS-SB
Cou
nts
2
4
6
8
10
12 <6GeV/cT
5<p right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
5
RS-SB
FIG. 8 (color online). Raw D! signals in different pT bins.In each plot, the bottom panel distribution is generated bysubtracting the sideband background from the right-sign distri-bution. Variable binning is used in the bottom panel for betterillustration.
L. ADAMCZYK et al. PHYSICAL REVIEW D 86, 072013 (2012)
072013-8
Phys. Rev. D 86, 72013a)
b)
D0
K−π+
π+
D*+
M( ) M( )
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
D* Meson Reconstruc5on
6
wrong-sign method was included in the systematic uncer-tainties. Details in determining the uncertainties on the rawD! yields including the double-counting effect will bediscussed in Sec. VA. The D! raw yields are summarizedin Table II.
To obtain the cross section, the event-selection criteriadescribed in the previous section were applied. The rawdistributions were further divided into pT slices to obtainthe raw D! yields in each pT bin. Figure 8 shows the D!
candidates and background distributions in different pT
bins. The bottom panel on each plot was generated bysubtracting the sideband background from the right-signcandidates. The mean and width from Gaussian fits arecompared with MC simulation in the right panel of Fig. 6,
and it shows the obtained D! peak positions and widthsagree with the MC simulation well. From this analysis, thetotal signal consisted of 364" 68 counts, and the raw yieldratio of D!#=D!$ is 0:93" 0:37.
IV. EFFICIENCYAND TRIGGER OR VERTEXBIAS CORRECTION
The final charmed-hadron cross section in p$ p colli-sions is calculated as follows:
Ed3!
dp3 % 1
2"& 1
#rec& 1
BR& !ND
pT!pT!y& !NSD
NMB& ftrg;vtx; (3)
where !NSD is the total nonsingly diffractive (NSD) crosssection, which is measured at STAR to be 30:0" 2:4 mb[30].NMB is the total number of minimum-bias events usedfor the analysis. !ND is the raw charmed-hadron signal ineach pT bin within a rapidity window !y. BR is thehadronic decay branching ratio for the channel of interest.There are two correction factors: #rec, which is the recon-struction efficiency including geometric acceptance, trackselection efficiency, PID efficiency, and analysis cut effi-ciency; and ftrg;vtx'pT(, which is the correction factor to
)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165
Cou
nts
0
500
1000
1500
2000
2500
right sign
wrong sign
sideband
)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05
Cou
nts
0
200
400
600
800
1000
1200
1400
1600
1800
2000
candidates0 D
sideband
FIG. 7 (color online). Upper: Raw D! candidate signal fromthe right-sign combinations in all p$ p minimum-biasevents. Histograms are combinatorial background distributionsfrom wrong-sign and sideband methods. Lower: Raw D0
candidates after requiring the D! candidate cut (0:144<!M<0:147 GeV=c2).
TABLE II. D! raw yields.
pT range (GeV=c) 2–3 3–4 4–5 5–6
pT (GeV=c) 2.45 3.44 4.45 5.45Raw yields 209" 58 98" 35 27" 11 12:3" 4:1
Cou
nts
100
200
300
400
500
600 <3GeV/cT
2<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
50
100RS-SB
Cou
nts
20
40
60
80
100 <4GeV/cT
3<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
20
40 RS-SB
Cou
nts
5
10
15
20
25
30<5GeV/c
T4<p right sign (RS)
wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
-5
0
5
10
15 RS-SB
Cou
nts
2
4
6
8
10
12 <6GeV/cT
5<p right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
5
RS-SB
FIG. 8 (color online). Raw D! signals in different pT bins.In each plot, the bottom panel distribution is generated bysubtracting the sideband background from the right-sign distri-bution. Variable binning is used in the bottom panel for betterillustration.
L. ADAMCZYK et al. PHYSICAL REVIEW D 86, 072013 (2012)
072013-8
Phys. Rev. D 86, 72013a)
b)
D0
K−π+
π+
D*+
M( ) M( )
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
D* Meson Reconstruc5on
6
wrong-sign method was included in the systematic uncer-tainties. Details in determining the uncertainties on the rawD! yields including the double-counting effect will bediscussed in Sec. VA. The D! raw yields are summarizedin Table II.
To obtain the cross section, the event-selection criteriadescribed in the previous section were applied. The rawdistributions were further divided into pT slices to obtainthe raw D! yields in each pT bin. Figure 8 shows the D!
candidates and background distributions in different pT
bins. The bottom panel on each plot was generated bysubtracting the sideband background from the right-signcandidates. The mean and width from Gaussian fits arecompared with MC simulation in the right panel of Fig. 6,
and it shows the obtained D! peak positions and widthsagree with the MC simulation well. From this analysis, thetotal signal consisted of 364" 68 counts, and the raw yieldratio of D!#=D!$ is 0:93" 0:37.
IV. EFFICIENCYAND TRIGGER OR VERTEXBIAS CORRECTION
The final charmed-hadron cross section in p$ p colli-sions is calculated as follows:
Ed3!
dp3 % 1
2"& 1
#rec& 1
BR& !ND
pT!pT!y& !NSD
NMB& ftrg;vtx; (3)
where !NSD is the total nonsingly diffractive (NSD) crosssection, which is measured at STAR to be 30:0" 2:4 mb[30].NMB is the total number of minimum-bias events usedfor the analysis. !ND is the raw charmed-hadron signal ineach pT bin within a rapidity window !y. BR is thehadronic decay branching ratio for the channel of interest.There are two correction factors: #rec, which is the recon-struction efficiency including geometric acceptance, trackselection efficiency, PID efficiency, and analysis cut effi-ciency; and ftrg;vtx'pT(, which is the correction factor to
)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165
Cou
nts
0
500
1000
1500
2000
2500
right sign
wrong sign
sideband
)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05
Cou
nts
0
200
400
600
800
1000
1200
1400
1600
1800
2000
candidates0 D
sideband
FIG. 7 (color online). Upper: Raw D! candidate signal fromthe right-sign combinations in all p$ p minimum-biasevents. Histograms are combinatorial background distributionsfrom wrong-sign and sideband methods. Lower: Raw D0
candidates after requiring the D! candidate cut (0:144<!M<0:147 GeV=c2).
TABLE II. D! raw yields.
pT range (GeV=c) 2–3 3–4 4–5 5–6
pT (GeV=c) 2.45 3.44 4.45 5.45Raw yields 209" 58 98" 35 27" 11 12:3" 4:1
Cou
nts
100
200
300
400
500
600 <3GeV/cT
2<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
50
100RS-SB
Cou
nts
20
40
60
80
100 <4GeV/cT
3<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
20
40 RS-SB
Cou
nts
5
10
15
20
25
30<5GeV/c
T4<p right sign (RS)
wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
-5
0
5
10
15 RS-SB
Cou
nts
2
4
6
8
10
12 <6GeV/cT
5<p right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
5
RS-SB
FIG. 8 (color online). Raw D! signals in different pT bins.In each plot, the bottom panel distribution is generated bysubtracting the sideband background from the right-sign distri-bution. Variable binning is used in the bottom panel for betterillustration.
L. ADAMCZYK et al. PHYSICAL REVIEW D 86, 072013 (2012)
072013-8
Phys. Rev. D 86, 72013a)
b)
D0
K−π+
π+
D*+
M( ) M( )
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
D* Meson Reconstruc5on
6
wrong-sign method was included in the systematic uncer-tainties. Details in determining the uncertainties on the rawD! yields including the double-counting effect will bediscussed in Sec. VA. The D! raw yields are summarizedin Table II.
To obtain the cross section, the event-selection criteriadescribed in the previous section were applied. The rawdistributions were further divided into pT slices to obtainthe raw D! yields in each pT bin. Figure 8 shows the D!
candidates and background distributions in different pT
bins. The bottom panel on each plot was generated bysubtracting the sideband background from the right-signcandidates. The mean and width from Gaussian fits arecompared with MC simulation in the right panel of Fig. 6,
and it shows the obtained D! peak positions and widthsagree with the MC simulation well. From this analysis, thetotal signal consisted of 364" 68 counts, and the raw yieldratio of D!#=D!$ is 0:93" 0:37.
IV. EFFICIENCYAND TRIGGER OR VERTEXBIAS CORRECTION
The final charmed-hadron cross section in p$ p colli-sions is calculated as follows:
Ed3!
dp3 % 1
2"& 1
#rec& 1
BR& !ND
pT!pT!y& !NSD
NMB& ftrg;vtx; (3)
where !NSD is the total nonsingly diffractive (NSD) crosssection, which is measured at STAR to be 30:0" 2:4 mb[30].NMB is the total number of minimum-bias events usedfor the analysis. !ND is the raw charmed-hadron signal ineach pT bin within a rapidity window !y. BR is thehadronic decay branching ratio for the channel of interest.There are two correction factors: #rec, which is the recon-struction efficiency including geometric acceptance, trackselection efficiency, PID efficiency, and analysis cut effi-ciency; and ftrg;vtx'pT(, which is the correction factor to
)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165
Cou
nts
0
500
1000
1500
2000
2500
right sign
wrong sign
sideband
)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05
Cou
nts
0
200
400
600
800
1000
1200
1400
1600
1800
2000
candidates0 D
sideband
FIG. 7 (color online). Upper: Raw D! candidate signal fromthe right-sign combinations in all p$ p minimum-biasevents. Histograms are combinatorial background distributionsfrom wrong-sign and sideband methods. Lower: Raw D0
candidates after requiring the D! candidate cut (0:144<!M<0:147 GeV=c2).
TABLE II. D! raw yields.
pT range (GeV=c) 2–3 3–4 4–5 5–6
pT (GeV=c) 2.45 3.44 4.45 5.45Raw yields 209" 58 98" 35 27" 11 12:3" 4:1
Cou
nts
100
200
300
400
500
600 <3GeV/cT
2<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
50
100RS-SB
Cou
nts
20
40
60
80
100 <4GeV/cT
3<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
20
40 RS-SB
Cou
nts
5
10
15
20
25
30<5GeV/c
T4<p right sign (RS)
wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
-5
0
5
10
15 RS-SB
Cou
nts
2
4
6
8
10
12 <6GeV/cT
5<p right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
5
RS-SB
FIG. 8 (color online). Raw D! signals in different pT bins.In each plot, the bottom panel distribution is generated bysubtracting the sideband background from the right-sign distri-bution. Variable binning is used in the bottom panel for betterillustration.
L. ADAMCZYK et al. PHYSICAL REVIEW D 86, 072013 (2012)
072013-8
Phys. Rev. D 86, 72013a)
b)
D0
K−π+
π+
D*+
π−
M( ) M( )
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
D* Meson Reconstruc5on
6
wrong-sign method was included in the systematic uncer-tainties. Details in determining the uncertainties on the rawD! yields including the double-counting effect will bediscussed in Sec. VA. The D! raw yields are summarizedin Table II.
To obtain the cross section, the event-selection criteriadescribed in the previous section were applied. The rawdistributions were further divided into pT slices to obtainthe raw D! yields in each pT bin. Figure 8 shows the D!
candidates and background distributions in different pT
bins. The bottom panel on each plot was generated bysubtracting the sideband background from the right-signcandidates. The mean and width from Gaussian fits arecompared with MC simulation in the right panel of Fig. 6,
and it shows the obtained D! peak positions and widthsagree with the MC simulation well. From this analysis, thetotal signal consisted of 364" 68 counts, and the raw yieldratio of D!#=D!$ is 0:93" 0:37.
IV. EFFICIENCYAND TRIGGER OR VERTEXBIAS CORRECTION
The final charmed-hadron cross section in p$ p colli-sions is calculated as follows:
Ed3!
dp3 % 1
2"& 1
#rec& 1
BR& !ND
pT!pT!y& !NSD
NMB& ftrg;vtx; (3)
where !NSD is the total nonsingly diffractive (NSD) crosssection, which is measured at STAR to be 30:0" 2:4 mb[30].NMB is the total number of minimum-bias events usedfor the analysis. !ND is the raw charmed-hadron signal ineach pT bin within a rapidity window !y. BR is thehadronic decay branching ratio for the channel of interest.There are two correction factors: #rec, which is the recon-struction efficiency including geometric acceptance, trackselection efficiency, PID efficiency, and analysis cut effi-ciency; and ftrg;vtx'pT(, which is the correction factor to
)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165
Cou
nts
0
500
1000
1500
2000
2500
right sign
wrong sign
sideband
)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05
Cou
nts
0
200
400
600
800
1000
1200
1400
1600
1800
2000
candidates0 D
sideband
FIG. 7 (color online). Upper: Raw D! candidate signal fromthe right-sign combinations in all p$ p minimum-biasevents. Histograms are combinatorial background distributionsfrom wrong-sign and sideband methods. Lower: Raw D0
candidates after requiring the D! candidate cut (0:144<!M<0:147 GeV=c2).
TABLE II. D! raw yields.
pT range (GeV=c) 2–3 3–4 4–5 5–6
pT (GeV=c) 2.45 3.44 4.45 5.45Raw yields 209" 58 98" 35 27" 11 12:3" 4:1
Cou
nts
100
200
300
400
500
600 <3GeV/cT
2<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
50
100RS-SB
Cou
nts
20
40
60
80
100 <4GeV/cT
3<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
20
40 RS-SB
Cou
nts
5
10
15
20
25
30<5GeV/c
T4<p right sign (RS)
wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
-5
0
5
10
15 RS-SB
Cou
nts
2
4
6
8
10
12 <6GeV/cT
5<p right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
5
RS-SB
FIG. 8 (color online). Raw D! signals in different pT bins.In each plot, the bottom panel distribution is generated bysubtracting the sideband background from the right-sign distri-bution. Variable binning is used in the bottom panel for betterillustration.
L. ADAMCZYK et al. PHYSICAL REVIEW D 86, 072013 (2012)
072013-8
Phys. Rev. D 86, 72013a)
b)
D0
K−π+
π+
D*+
M( ) M( )
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
D* Meson Reconstruc5on
6
wrong-sign method was included in the systematic uncer-tainties. Details in determining the uncertainties on the rawD! yields including the double-counting effect will bediscussed in Sec. VA. The D! raw yields are summarizedin Table II.
To obtain the cross section, the event-selection criteriadescribed in the previous section were applied. The rawdistributions were further divided into pT slices to obtainthe raw D! yields in each pT bin. Figure 8 shows the D!
candidates and background distributions in different pT
bins. The bottom panel on each plot was generated bysubtracting the sideband background from the right-signcandidates. The mean and width from Gaussian fits arecompared with MC simulation in the right panel of Fig. 6,
and it shows the obtained D! peak positions and widthsagree with the MC simulation well. From this analysis, thetotal signal consisted of 364" 68 counts, and the raw yieldratio of D!#=D!$ is 0:93" 0:37.
IV. EFFICIENCYAND TRIGGER OR VERTEXBIAS CORRECTION
The final charmed-hadron cross section in p$ p colli-sions is calculated as follows:
Ed3!
dp3 % 1
2"& 1
#rec& 1
BR& !ND
pT!pT!y& !NSD
NMB& ftrg;vtx; (3)
where !NSD is the total nonsingly diffractive (NSD) crosssection, which is measured at STAR to be 30:0" 2:4 mb[30].NMB is the total number of minimum-bias events usedfor the analysis. !ND is the raw charmed-hadron signal ineach pT bin within a rapidity window !y. BR is thehadronic decay branching ratio for the channel of interest.There are two correction factors: #rec, which is the recon-struction efficiency including geometric acceptance, trackselection efficiency, PID efficiency, and analysis cut effi-ciency; and ftrg;vtx'pT(, which is the correction factor to
)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165
Cou
nts
0
500
1000
1500
2000
2500
right sign
wrong sign
sideband
)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05
Cou
nts
0
200
400
600
800
1000
1200
1400
1600
1800
2000
candidates0 D
sideband
FIG. 7 (color online). Upper: Raw D! candidate signal fromthe right-sign combinations in all p$ p minimum-biasevents. Histograms are combinatorial background distributionsfrom wrong-sign and sideband methods. Lower: Raw D0
candidates after requiring the D! candidate cut (0:144<!M<0:147 GeV=c2).
TABLE II. D! raw yields.
pT range (GeV=c) 2–3 3–4 4–5 5–6
pT (GeV=c) 2.45 3.44 4.45 5.45Raw yields 209" 58 98" 35 27" 11 12:3" 4:1
Cou
nts
100
200
300
400
500
600 <3GeV/cT
2<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
50
100RS-SB
Cou
nts
20
40
60
80
100 <4GeV/cT
3<p
right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
20
40 RS-SB
Cou
nts
5
10
15
20
25
30<5GeV/c
T4<p right sign (RS)
wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
-5
0
5
10
15 RS-SB
Cou
nts
2
4
6
8
10
12 <6GeV/cT
5<p right sign (RS) wrong sign (WS) sideband (SB)
)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155
)2C
ount
s (/
0.2
MeV
/c
0
5
RS-SB
FIG. 8 (color online). Raw D! signals in different pT bins.In each plot, the bottom panel distribution is generated bysubtracting the sideband background from the right-sign distri-bution. Variable binning is used in the bottom panel for betterillustration.
L. ADAMCZYK et al. PHYSICAL REVIEW D 86, 072013 (2012)
072013-8
Phys. Rev. D 86, 72013a)
b)
D0
K−π+
π+
D*+
)2) (GeV/c/)-M(K//M(K0.14 0.145 0.15 0.155 0.16 0.165
Cou
nts
100
200
300
400
500
600
right signwrong signside band
STAR preliminary
= 500 GeVsp+p > 4.2 GeVTE
[GeV/c]T
p0 2 4 6 8 10 12 14 16 18 20
]-2
dy) [
mb(
GeV
/c)
Tdp Tp/
/(2
/< / p
pm2 d
-910
-810
-710
-610
-510
-410
-310
-210
-110
1
10 Trigger Efficiency=BHT1 pions
Nucl. Phys. B 335 261-287 500 GeVpUA1 pions from p
scaled from pp 200 to pp 500 GeV by PythiaSTAR pions, Phys. Rev. Lett. 108 72302
< 13.5 GeV/cT
in 12 < pPythia Pions scaled to match STAR pions
with lower and upper boundHagedorn Power-law fit to STAR pions
STAR Pions, measured from Min Bias sample
[GeV/c]T
p
0 2 4 6 8 10 12 14 16 18 20
Eff
icie
ncy
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
[GeV/c]T
p
4 6 8 10 12 14 16 18 20
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iency
-610
-510
-410
-310
-210
-110
Matching0
D
Reconstruction0
D
Matching MB*D
Reconstruction MB*D
Reconstruction HT*D
Trigger HT*D
p+p @ 500 GeV
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
Correc5ons
7
pT [GeV/c] 1-‐2 2-‐3 3-‐8
VPDMB bias 0.70 0.65 0.63
Pion Spectra in VPDMB and BHT1 D0 & D* efficiencies
[GeV/c]Tp0 2 4 6 8 10 12 14 16 18 20
]-2
dy) [
mb(
GeV
/c)
Tdp Tp/
)/(2
ccppm2
(d
-810
-710
-610
-510
-410
-310
-210
-110 / 0.224 BHT1D*md
/ 0.224 MBD*md
/ 0.565 MB0Dmd
Levy-fit to All
0FONLL D
FONLL D*
fact. + BCFY FFTk
fact. + Peterson FFTk
[GeV/c]Tp0 2 4 6 8 10 12 14 16 18 20
]-2
dy) [
mb(
GeV
/c)
Tdp Tp/
)/(2
cppm2
(d
-810
-710
-610
-510
-410
-310
-210
-110
kT fact. : ѥF = ѥR = (mc)T, mc = 1.5 GeV/c2
FONLL D0: ѥF = ѥR = mc = 1.27 GeV/c2
FONLL D*: ѥF = ѥR = (mc)T, 1.3 < mc < 1.7 GeV/c2
[JHEP 9805 007]
[Phys. Rev. C87 014908]
[Phys. Rev. D 87 094022]
[Phys. Rev. D 87 094022]
p+p @ 500 GeV
[GeV/c]T
p0 2 4 6 8 10 12 14 16 18 20
]-2
dy) [
mb(
GeV
/c)
Tdp Tp/
)/(2
ccppm2
(d
-810
-710
-610
-510
-410
-310
-210
[GeV/c]T
p0 2 4 6 8 10 12 14 16 18 20
]-2
dy) [
mb(
GeV
/c)
Tdp Tp/
)/(2
cppm2
(d
-810
-710
-610
-510
-410
-310
-210 ccmd
Levy-fit
cFONLL c
limits cFONLL c
[JHEP 9805 007]
quadratic sum of mass and scale uncertainty
p+p @ 500 GeV
ccmd = dmD ×FONLL ccFONLL D
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
Charm Cross Sec5on at Mid-‐rapidity
8
[GeV]s210 310 410
b]+ [
ccNNm
1
10
210
310
410
NLONLO limitSPS/FNALPHENIX ePamir/MuonUA2
STAR p+pSTAR Au+AuALICE[2]
ATLAS PreliminaryLHCb Preliminary
[1] Vogt R. et al., PoS ConfinementX (2012) 203ALICE Collaboration, JHEP07(2012)191
�+ F/m, + R
/m) = (1.35, 1.71)�+ F/m, + R
/m) = (4.65, 1.48)
NLO: m = 1.27 GeV/c2
+F/m = 2.1+R/m = 1.6
d�cc̄
dy⇥
((5.6± 0.1) @ 500 GeV(4.7± 0.7) @ 200 GeV
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
Total Charm Cross Sec5on
9
Extrapola5on to full rapidity from Pythia simula5on:
[3] Phys. Rev. D86, 72013
[3]
[GeV]s210 310 410
b]+ [
ccNNm
1
10
210
310
410
NLONLO limitSPS/FNALPHENIX ePamir/MuonUA2
STAR p+pSTAR Au+AuALICE[2]
ATLAS PreliminaryLHCb Preliminary
[1] Vogt R. et al., PoS ConfinementX (2012) 203ALICE Collaboration, JHEP07(2012)191
�+ F/m, + R
/m) = (1.35, 1.71)�+ F/m, + R
/m) = (4.65, 1.48)
NLO: m = 1.27 GeV/c2
+F/m = 2.1+R/m = 1.6
d�cc̄
dy⇥
((5.6± 0.1) @ 500 GeV(4.7± 0.7) @ 200 GeV
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
Total Charm Cross Sec5on
9
Many thanks to:
Jaro BielcikXin DongWitek BorowskiJamie DunlopZhangbu XuPavol Federic
Extrapola5on to full rapidity from Pythia simula5on:
[3] Phys. Rev. D86, 72013
[3]
David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015
Special Thanks To
10
Prof. Zdeněk Janout Msgr. Georges Lemaître
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