summary of the heavy flavour session joined hfl+pdf session
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Summary of the Heavy Flavour Session Joined HFL+PDF Session. Katerina Lipka (DESY). Deep Inelastic Scattering 2010 Florence. Heavy Flavour Session. HQ and QCD tests: H1 + ZEUS + CDF charmonium in ep and pp open charm and beauty in ep HQ and nucleon structure: H1+ZEUS, NOMAD - PowerPoint PPT PresentationTRANSCRIPT
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Summary of the
Heavy Flavour Session
Joined HFL+PDF Session
Katerina Lipka (DESY)
Deep Inelastic Scattering 2010 Florence
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Heavy Flavour Session
• HQ and QCD tests: H1 + ZEUS + CDF
• charmonium in ep and pp
• open charm and beauty in ep
• HQ and nucleon structure: H1+ZEUS, NOMAD
• charm and beauty structure functions
• Joined Session PDF+HF: HQ in PDF fits
• SM tests via HQ in e+e- : BaBar+ Belle
• HQ in heavy ion collisions and pp: STAR, PHENIX
• Top Quark: CDF, D0
• Cross section, mass, other properties
• First steps at the LHC: ALICE, ATLAS, CMS, LHCb
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WG IV Summary 3
Charmonium: Inelastic J/ production in epTalks: M. Steder, A. Bertolin
Test QCD: Color Singlet vs Color Octet:
Cross section measurement vs pT(J/) and z=E/E
CSM NLO:
describes shape, not normalization
NRQCD (CO):
Recovers normalization
Fails to describe shape of elasticity z
s=320 GeV
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WG IV Summary 4
Charmonium: J/ Polarization in epTalks: M. Steder, A. Bertolin
Additional test of the production models
Polarization parameters extracted using angular measurements
Goal: look for evidence of CO terms at HERA
Various predictions show different deficits to describe the data
Final conclusion needs higher order calculations
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WG IV Summary 5
Upsilon polarization in ppT.Kuhr
transverse
longitudinal
Trend to longitudinal polarization observed
CDF disagrees with D0
Data disagree with NRQCD
J/ polarization not described by NRQCD! mc too low?
NRQCD
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WG IV Summary 6
Open charm, beauty at HERAZ. Staykova, V. Aushev, M. Lysovy, P. Thompson, M. Brinkmann, P. Roloff
• c, b (+ jets) in DIS and p: powerful test of pQCD
• Structure functions F2c, F2
b : direct test of g(x)
c-, b- tagging methods:
reconstruction of charmed mesons, vertex information
different methods have orthogonal uncertainties
Factorization: (HQ) = proton structure hard ME
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WG IV Summary 7
Open charm, beauty at HERAZ. Staykova, V. Aushev, M. Lysovy, P. Thompson, M. Brinkmann, P. Roloff
c, b (+ jets) in DIS and p: powerful test of pQCD
Beauty production:
b in p
Massive NLO pQCD describes the data reasonably well
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WG IV Summary 8
Open charm, beauty at HERAZ. Staykova, V. Aushev, M. Lysovy, P. Thompson, M. Brinkmann, P. Roloff
c, b (+ jets) in DIS and p: powerful test of pQCD
Charm production:
Above production threshold (pT>1.5 GeV)
Massive NLO pQCD describes the data reasonably well At threshold!
NLO underestimates data below the threshold
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WG IV Summary 9
Open charm, beauty at HERAK.Daum, M. Lysovy, P. Thompson, M. Brinkmann, P. Roloff
Structure functions F2c, F2
b : direct test of g(x)
),()1(1
),( 22
22 QxF
yyQxF cc
Lcccc
−+−∝ compare to NC~F2
Combined F2c:
systematic correlations
accounted for
<F2c> ~ 10%
Compared to HERAPDF1.0:
Band: 1.35<mc<1.6
5
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WG IV Summary 10
HERA PDF: additional uncertainty due to variation of 1.4 < mc< 1.65 GeV
The choice of the mc influences
-the gluon PDF,
-most visible in charm PDF,
-consequences for light quarks
HERAPDF1.0 vs HERA F2c : charm mass
A. Cooper-Sarkar
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WG IV Summary 11
LHC@10 TeV
What does it mean for LHCchoice of mc=1.65 raises W/Z cross-section predictions at the LHC by ~3%
More significant than other PDF uncertainties (exp. modelmodel, param..)
Larger mc → more gluons, less charm → more light quarks → larger W
Does matter for the Luminosity measurement @ LHC !
A. Cooper-Sarkar
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WG IV Summary 12
PDF Fits using HERA F2c data
A. Cooper-Sarkar
usual cuts on data Q2 > 3.5 GeV2, formalism as for HERAPDF1.0
two values of charm mass mc=1.4 GeV and mc=1.65 GeV compared
PDF Fit to charm data prefer mc=1.65 GeV
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WG IV Summary 13
PDF Fits using HERA F2c data: test scheme
R. Thorne, A. Cooper-Sarkar
standard
optimal
MSTW prescription for HF treatment
Q2
Test optimal MSTW
Smoother gluon: smaller F2c compensate by smaller mc: obvious effect
Do we learn something?
HQ treatment is crucial for PDF fits
Use charm data to test different schemes @ fixed mc
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WG IV Summary 14
Heavy quark production in N (NOMAD)
Statistic uncertainty 3 - 6%, Systematic uncertainty 2%
Largest charm di- data sample close to charm threshold
• most precise measurement σμμ/σCC
(E 6 GeV)
R. Petti
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WG IV Summary 15
Heavy quark production in N (NOMAD)
NOMAD di- data in global PDF fits
improves the accuracy of the strange sea
and of the charm quark mass by a factor 2
(E 6 GeV)
R. Petti
Largest charm di- data sample close to charm threshold
• most precise measurement σμμ/σCC
• sensitivity to strange see at high x
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WG IV Summary 16
Heavy Quarks in e+e- : test SMBaBar, Belle:
D-Measurements:
• Decay constant fDs: overlap between wave function of light and heavy quarks
BaBar: new measurement closer to Lattice QCD prediction
• Charm mixing and CP in D0, D0 : BaBar: mixing parameters closer to SM
BaBar, Belle: many channels investigated, no evidence for CP violation in D-channel
• No signal for T-violation in D0K+K-+-
B-Measurements:
• BV+V polarization: longitudinal polarization fraction is not understood
disagreement between BaBar and Belle persists
• first observation of 4-body charmless baryonic B decays
Youngjoon Kwon, D. Milanes
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WG IV Summary 17
Heavy Quarks in heavy ion collisions
• STAR and PHENIX NPE result in 200GeV p+p collisions consistent
• FONLL describes data well
Test collinear factorization
Suppression or enhancement: study of quark-gluon plasma
Wei Xie, G. Odyniec, A. Sickles
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WG IV Summary 18
The heaviest quark: Top cross section
Cross-section measurements:
• Test NLO QCD calculations
• Allow the extraction of top pole mass
• Sample validation for other top properties measurements
• Background for Higgs / SUSY search
Top at TEVATRON:
all hadronic
46%
Semi-leptonic
15%dileptons
G. Compostella, S. Chevalier-Thery, Sung Park, J. Adelman G. Petrillo
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WG IV Summary 19
Top cross section
Different channels are combined, systematic correlations taken into account
Error systematic dominated, experimental uncertainty ~ model uncertainty
G. Compostella, S. Chevalier-Thery, Sung Park, J. Adelman G. Petrillo
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WG IV Summary 20
Top pole masstt prediction depends on mt:
Measured cross section compared to (approximate) NNLO calculations:
Pole top mass can be extracted
D0 ”direct” (3.6 fb-1): mt=174.20.91.5 GeV
G. Compostella, S. Chevalier-Thery, Sung Park, J. Adelman G. Petrillo
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WG IV Summary 21
Other top quark propertiesG. Compostella, S. Chevalier-Thery, Sung Park, J. Adelman G. Petrillo
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WG IV Summary 22
On the way to HQ at the LHC First D-mesons at LHCb with L=110 b-1
E. Polycarpo Macedo
Charmonium @ L=160 b-1
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WG IV Summary 23
On the way to HQ at the LHC
ALICE, ATLAS, CMS:
J. N. Donini, A. Rossi, R. Covarelli, T. Matsushita
K0s
900 GeVDATA
• Rich physics programm
• First understand the detector
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WG IV Summary 24
Thanks to all speakers!
Those who made it to come
Those who participated via EVO
Those who agreed to spontaneously feature the talks
only 1 cancelled experimental talk
but many experts missing