first results on particle correlations from alice
DESCRIPTION
First results on particle correlations from ALICE. Dariusz Mi ś kowiec, GSI Darmstadt and EMMI for the ALICE Collaboration . why two-pion correlations two-pion correlations at 900 GeV first look at 7 TeV data try harder: high-p T correlations summary. - PowerPoint PPT PresentationTRANSCRIPT
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 1
First results on particle correlations from ALICE
Dariusz Miśkowiec, GSI Darmstadt and EMMI
for the ALICE Collaboration
why two-pion correlationstwo-pion correlations at 900 GeVfirst look at 7 TeV datatry harder: high-pT correlationssummary
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 222
transverse expansion pT spectra look thermal but boostedlongitudinal expansion source size depends on pT
Collectivity in nuclear collisions
collective transverse velocity
apparent source of pions with given (y,pT)
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 33
temperature and transverse flow when energy conservation treated properly
3
Mike Lisa, CERN Theory Phenomenology Seminar, 16-Oct-2009
Transverse expansion
transverse expansion seems to be there even in very peripheral nuclear collisions
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 4
Pion source size from STAR
STAR, arXiv:1004.0925 [nucl-ex]STAR, Phys. Rev. C 80 (2009) 24905
pT dependence of pion source size similar in nuclear and pp collisions
Au + AuCu + Cu
p + p
(various ways of fitting)
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 5
identical-pion correlation analysis technique (HBT)
peak width ~ 1 / source size
pion source size accessible experimentally
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 6
Two-pion correlation functions in A+A and p+p collisions
baseline shape is the challenge in p+p data
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 777
pp at sqrt(s) = 900 GeV250 k minimum bias events10 days starting on Dec 6, 2009
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 8D. Miskowiec, ALICE femto meeting 2010-03-22 88
identical pion correlation functions
Bose-Einstein peak clearly visible
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 9D. Miskowiec, ALICE femto meeting 2010-03-22 99
Unlike-sign pion correlation function
Coulomb and K0S peaks visible
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 10
Multiplicity and transverse momentum dependenceidentical pions unlike-sign pions
baseline has to be treated properly
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 11
Multiplicity dependence
visible dependence in pp HBT radii depend on multiplicity rather than on collision geometry
for comp.: nuclear collisionsM. Lisa, Ann. Rev. Nucl. Part. Sci. 55, 357
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 12
Transverse momentum dependence
no significant dependence on transverse momentum
for comparison: in nuclear collisions
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 13
Dependence on the baseline assumption
but: transverse momentum dependence is sensitive to the baseline shape assumption
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 14
pp at sq
rt(s)
= 7 TeV
180 M
minim
um bias ev
ents
from M
arch 31
till n
ow
120 M events used for this talk
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 15
pp at sqrt(s) = 900 GeV
7 M minbias events
on May 2-3, 2010
2.1 M events used for this talk
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 16
7 TeV and new 900 GeV data
high-q baseline flatter at 7 TeV
identical pion correlations
120 M events at 7 TeV2.1 M events at 0.9 TeV
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 17
π+π - correlations at 7 TeV
K0S
ρf0 f2
ω
Coulomb
rich resonance structure
low-q baseline steeper at 7 TeV origin: jets
high-q baseline flatter at 7 TeV origin: momentum cons.
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 18
Non-identical particle correlations from pp at 7 TeV
C(qout ) asymmetry -- another handle on transverse flow
pion - kaon
pion - proton
K*
Δ
Λ
example: Pb+Au at 17.2 GeV CF’s from CERES
π+π - π- p π+p
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 19
Summary
HBT radii at 900 GeV depend on multiplicity no strong dependence on transverse momentumcorrelation baseline of crucial importance
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backup
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 212121
transverse momentum dependence of Rside
Tm
RpRf
Gside 2
1
)(
Rlong fTmt
K2(mt /T)K1(mt /T)
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 222222
baseline slope significant at 0.9 TeV and abovestudy by Adam Kisiel
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 23
7 TeV, identical pions
low mult
high mult
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 24
High stat 900 GeV from 2010, identical pions
low mult
high mult
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 25
7 TeV, unlike-sign pions
low mult
high mult
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 26
High stat 900 GeV, from 2010 unlike-sign pions
low mult
high mult