oo ~ )À *Ó ²Þ)o~Þ) Þcds.cern.ch/record/2710585/files/poster-2020-1030.pdf · cpv in...
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![Page 1: Oo ~ )À *Ó ²Þ)O~Þ) Þcds.cern.ch/record/2710585/files/Poster-2020-1030.pdf · CPV in interference of decay and decay after B0 B0 mixing ! time dependent CP asymmetries : ! b](https://reader035.vdocuments.net/reader035/viewer/2022071213/60351cf3e69ee252837c094f/html5/thumbnails/1.jpg)
Measurement of CP violation in B0→ D∗±D∓ decays [1]
Philipp Ibis on behalf of the LHCb collaboration
Introduction: CP violation in B0 mixingOscillation between B0 and B0 states.
CT&S Meeting | Status of Simulation Group | MC liaisons: Alex Birnkraut, Margarete Schellenberg 1
u, c, t
W W
u, c, t
d
B0
b
b
B0
d
W
u, c, t u, c , t
W
d
B0
b
b
B0
d
ޠ
u, c, t
W W
u, c, t
d
B0
b
b
B0
d
W
u, c, t u, c , t
W
d
B0
b
b
B0
d
ޠ
Decay of a neutral B meson into the final state f or f : directly or after oscillation→ four time-dependent decay rates.
dΓ(t)
dt=e−t/τd
8τd(1 + rAD∗D)×[
1− d(SD∗D + r∆SD∗D) sin(∆mt) + d(CD∗D + r∆CD∗D) cos(∆mt)]
d =
{1, B0
−1, B0
r =
{1, f−1, f
B2OC TD Meeting | Status of B0→D*D | Margarete Schellenberg
Motivation‣ aim: first measurement of CPV in B0→D*±D∓ decays at LHCb
‣ former measurements by BaBar/Belle
‣ CPV in interference of decay and decay after B0B0 mixing
‣ time dependent CP asymmetries:
‣ b → ccd decay: • higher order contributions are not suppressed
• CPV in B0→D*±D∓ is sensitive to sin(2βeff), βeff (≈β)
‣ measurement of decay-time-dependent decay rate can be performed
2
B0
B0f = D*+D–
f = D*–D+
ACP,f (t) =�(B0(t)� f )� �(B0(t)� f )
�(B0(t)� f ) + �(B0(t)� f )
= Sf sin(�mt)� Cf cos(�mt)
ACP,f (t) =�(B0(t)� f )� �(B0(t)� f )
�(B0(t)� f ) + �(B0(t)� f )
= Sf sin(�mt)� Cf cos(�mt)
d�(t, d, q,�)dt � e�t/� [1 + d(1� 2�) ((S + q�S) sin(�mt)� (C + q�C) cos(�mt))]
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S =1
2(Sf + Sf )
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�S =1
2(Sf � Sf )
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CP violation in B0→ D∗±D∓• First measurement of CP violation in B0→ D∗±D∓at LHCb
• Former measurements by Belle and BaBar [2,3]
D*+- D-+ S
HFL
AV
Sum
mer
201
6
-1 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4
BaBarPRD 79, 032002 (2009)
-0.68 ± 0.15 ± 0.04
BellePRD 85 (2012) 091106
-0.78 ± 0.15 ± 0.05
AverageHFLAV
-0.73 ± 0.11
HFLAVHFLAVSummer 2016
D*+- D-+ C
HFL
AV
Sum
mer
201
6
-0.2 -0.1 0 0.1 0.2
BaBarPRD 79, 032002 (2009)
0.04 ± 0.12 ± 0.03
BellePRD 85 (2012) 091106
-0.01 ± 0.11 ± 0.04
AverageHFLAV
0.01 ± 0.09
HFLAVHFLAVSummer 2016
D*+- D-+ A
HFL
AV
Sum
mer
201
6
-0.1 -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16
BaBarPRD 79, 032002 (2009)
0.01 ± 0.05 ± 0.01
BellePRD 85 (2012) 091106
0.06 ± 0.05 ± 0.02
AverageHFLAV
0.03 ± 0.04
HFLAVHFLAVSummer 2016
[4]
• b→ ccs decays are sensitive to weak phase 2β
• Measured by several experiments in different chan-nels [4]
• Same phase appears in b→ ccd transitions
• ForB0→ D∗±D∓ decays higher-order diagrams con-tribute to CP violation.
Instrumental asymmetries• Overall asymmetry is corrected for instrumentalasymmetries from reconstruction, detection and par-ticle identification
• B0→ D∗±D∓ decay is charge-balanced, asymme-tries only due to different momentum spectra of pos-itive and negative pions and kaons
• 6 million prompt D±→ K∓π±π± decays reweightedto signal D∗− or D− distributions
• Split into four subsamples: One sample perD0 decaymode and one for D∗− and D−, respectively
• Asymmetries AD∗−det and AD−
det calculated with D+ andD− yields from fits to the mass distributions
Final state AD∗−det AD−det AD∗−D+det [%]
K−π+ 0.0169 0.0158 0.11± 0.40± 0.30K−π−π+π+ 0.0146 0.0138 0.09± 0.26± 0.51
Signal extractionReconstruction• D∗+→ D0π+
D0→ K−π+D0→ K−π−π+π+
• D−→ K+π−π−
Full LHCb dataset• 1 fb−1 at 7TeV• 2 fb−1 at 8TeV• 6 fb−1 at 13TeV
Multivariate Selection• Further reduction of combinatorial background
• Boosted Decision Tree (BDT)
• Signal proxy: signal MC
• Background proxy: upper mass sideband from data
• Kinematic, topological and particle identification variables used
• BDT cut point minimises uncertainties of CP parameters
Mass Fit• Disentangle signal from remaining background
• Shapes of the signal and background components based on sim-ulated data
Signal CandidatesK−π+ K−π−π+π+
Run 1 856± 32 469± 28Run 2 3265± 61 1570± 48
Can
didates/(6
MeV/c
2)
200
400
600
800
1000
1200
mD∗±D∓ [MeV/c2]
5000 5200 5400 5600−5
0
5
Pull
LHCbRun 2
Total
B0→ D∗±D∓
B0s→ D∗±D∓
B0→ D+s D
∗−
B0→ D∗+D∗−
B0s→ D∗+D∗−
Comb. bkg.
Can
didates/(6
MeV/c
2)
100
200
300
400
500
600
mD∗±D∓ [MeV/c2]
5000 5200 5400 5600−5
0
5
Pull
LHCbRun 2
Total
B0→ D∗±D∓
B0s→ D∗±D∓
B0→ D+s D
∗−
B0→ D∗+D∗−
B0s→ D∗+D∗−
Comb. bkg.
Flavour TaggingKnowledge of b quark flavour at produc-tion is essential for measurements of time-dependent CP asymmetries.
PV
SV
b→ cb→ X l−
SVc→ s
same side
opposite side
b
b
D∗±
D∓
d
du
duu
π+
p
x
l−
K−
B0
hb
SS pion
SS proton
OS muonOS electron
OS kaon
OS vertex chargeOS charm
Tagging Algorithms• OSµ, e , K, vtx Charge• SSp and SSπ
Calibration Channels• B0→ D+s D−• B0→ D∗−D+s
Tagging PowermD+
s D−(MeV/c2)5300 5400 5500C
andidates/(2.8
MeV/c
2)
0
500
1000
1500
2000
2500 LHCb TotalB0→ D+
s D−
B0s → D−
s D+
Comb. bkg.
[5]
Sample εtag [%] εtagD2 [%]
Run1 K−π+ 80.2± 1.4 5.61± 0.36K−π−π+π+ 88.8± 1.9 6.25± 0.55
Run2 K−π+ 93.5± 0.5 6.61± 0.19K−π−π+π+ 92.7± 0.8 7.05± 0.29
Decay-time fitCP observables are extracted via fit to decay time.
1
10
210
Sign
al Y
ield
/ (
0.12
5 ps
)
LHCb
2 4 6 8 10Decay time [ps]
5−
0
5
Pull
• Decay-time acceptance: cubic splines• Decay-time resolution: triple Gaussian, σt ≈ 60 fs
References[1] LHCb collaboration, R. Aaij et al., submitted to JHEP
[arXiv:1912.03723][2] Belle collaboration, M. Röhrken et al., Phys. Rev. Lett. 108 (2012)
[arXiv:1201.4643][3] BaBar collaboration, B. Aubert et al., Phys. Rev. D79 (2009)
[arXiv:0808.1866][4] Heavy Flavor Averaging Group, Y. Amhis et al. [arXiv:1612.07233][5] LHCb collaboration, R. Aaij et al., Phys. Rev. Lett. 117 (2016)
[arXiv:1608.06620]
ResultsDominant systematic uncertainties:• SD∗D , ∆SD∗D , CD∗D and ∆CD∗D : FT calibration andsignal mass model
• AD∗D : prompt D± meson mass shape
SD∗D = −0.861± 0.077 (stat)± 0.019 (syst)∆SD∗D = 0.019± 0.075 (stat)± 0.012 (syst)CD∗D = −0.059± 0.092 (stat)± 0.020 (syst)∆CD∗D = −0.031± 0.092 (stat)± 0.016 (syst)AD∗D = 0.008± 0.014 (stat)± 0.006 (syst)
• Most precise measurement in B0→ D∗±D∓ decays
• Precision of CD∗D and ∆CD∗D comparable with pre-vious measurements
• Precision of world average forSD∗D ,∆SD∗D andAD∗Dsignificantly improved
1