dariusz miskowiec, particle correlations in alice, physics at the lhc, hamburg, 10-jun-2010 1 first...
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Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun 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 collisionsTRANSCRIPT
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
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)
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
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)
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
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
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
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
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
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
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
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
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
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
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
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
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.
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
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
backup
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)
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
Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 23
7 TeV, identical pions
low mult
high mult
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
Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 25
7 TeV, unlike-sign pions
low mult
high mult
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