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HADES coll. meeting, Oct. 31, 2007
Charged pion production in C+C
at 1 and 2 A GeV
• results of data analysis from experiments NOV02 and AUG04
Jehad Mousa and Pavel Tlustý
• study of charged meson production in C+C
• new: more detailed efficiency study of real data
new method of extrapolation of particle yields to full solid angle
better control of systematic errors
• report on C+C charged meson analysis http://hades-wiki.gsi.de/cgibin/view/Physics/HadronProduction
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HADES coll. meeting, Oct. 31, 2007
• two tracking methods: Kick and Runge-Kutta
• Kick+RK : inner mdc segment 2 > -1,
• RK: 2 < 1000, RKAccepted=1, MetaHit matched
• tracks with TOFINO paddle multiplicity =1
• PID - velocity and momentum
Track selection and PIDTrack selection and PID
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HADES coll. meeting, Oct. 31, 2007
PID efficiency and purityPID efficiency and purity
- performance checked using UrQMD
- pions identified for momenta 150 < p < 1000 MeV/c
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HADES coll. meeting, Oct. 31, 2007
Acceptance and efficiencyAcceptance and efficiency efficiency calculated using UrQMD as
ratio
Nrectracks/Nprimary
for p, +,- in theta vs momentum
averaged over phi
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HADES coll. meeting, Oct. 31, 2007
““Selfconsistency check” - NOV02 - Selfconsistency check” - NOV02 -
UrQMDUrQMD
),( ),(
),( ),(),(
pEp
pPpNpN identified
corr
UrQMD input (emitted) and its reconstruction by analysis
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HADES coll. meeting, Oct. 31, 2007
““Selfconsistency check” - NOV02 - Selfconsistency check” - NOV02 -
UrQMDUrQMD UrQMD input (emitted) and its reconstruction by analysis
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HADES coll. meeting, Oct. 31, 2007
Reconstruction efficiency checkReconstruction efficiency check
-
-
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HADES coll. meeting, Oct. 31, 2007
Reconstruction efficiency checkReconstruction efficiency check
Errors of individual data points from
sectorwise analysis:
1 GeV 2 GeV
RMS 3-5% 2-3%
maximum up to 20% up to 20%
Error of integral yield from
sectorwise analysis:
1 GeV 2 GeV
RMS 2% 1.5%
maximum 7% 4%
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HADES coll. meeting, Oct. 31, 2007
Results
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HADES coll. meeting, Oct. 31, 2007
dN/d cos(cm) ~ 1. + A2 ∙ cos2(cm)
Center of mass polar distributions
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HADES coll. meeting, Oct. 31, 2007
H
h
h
Center of mass polar distributions
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HADES coll. meeting, Oct. 31, 2007
Center of mass polar distributions
A2 EXP A2 UrQMD
mom_cm > 200 MeV/c 1.05 ± 0.20 1.08
all momenta 0.70
exp. data in agreement with UrQMD => A2 = 0.7 used for PLUTO simulation of dileptons
2 A GeV
1 A GeV
A2 EXP A2 UrQMD
mom_cm > 200 MeV/c 0.88 ± 0.12 1.45
all momenta 0.56
exp. A2 lower by ~ 40% than UrQMD => A2 = 0.34 recommended for PLUTO simulation of dileptons
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HADES coll. meeting, Oct. 31, 2007
Brockman et al. Ar+KCl 1.8 AGeV
central collisions:
Brockman: similar A2 = 0.52 but different A2 dependence on momentum
FOPI NPA 781 (2007) shows the same anisotropy for Ca+Ca 1.93 A GeV
HADES 2 A GeV
Center of mass polar distributions
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HADES coll. meeting, Oct. 31, 2007
mmTT distributions distributions
21 /2
/12
1 TmTm
TT
TT eCeCdm
d
m
Fitting of mT spectra measured at midrapidity by a Bolzmann distribution with one or two slope function
Inverse slope shows temperature of thermal source
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HADES coll. meeting, Oct. 31, 2007
mmTT distributions C+C 1 A GeV distributions C+C 1 A GeV
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HADES coll. meeting, Oct. 31, 2007
mmTT distributions C+C 2 A GeV distributions C+C 2 A GeV
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HADES coll. meeting, Oct. 31, 2007
mmTT distributions at midrapidity distributions at midrapidity
1 A GeV
2 A GeV
1 A GeV
2 A GeV
H
H
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HADES coll. meeting, Oct. 31, 2007
Fits of pFits of ptt by 1 or 2 slopes by 1 or 2 slopes
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HADES coll. meeting, Oct. 31, 2007
mmTT distributions distributions
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HADES coll. meeting, Oct. 31, 2007
mmTT distributions distributions
1 A GeV 2 A GeV
HADEST+ = 58 ± 1
T- = 58 ± 1
T+ = 50 ± 10; 89.5 ± 2.1
T- = 49 ± 5; 86 ± 3
KaosT- = 45 ± 3; 62 ± 3 T- = 40 ± 3; 86 ± 3
Taps T0 = 54 ± 3 T0 = 83 ± 2 (one slope!)
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HADES coll. meeting, Oct. 31, 2007
Rapidity distributionsRapidity distributions
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HADES coll. meeting, Oct. 31, 2007
Extrapolation in pExtrapolation in ptt
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HADES coll. meeting, Oct. 31, 2007
Extrapolation in pExtrapolation in ptt
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HADES coll. meeting, Oct. 31, 2007
Rapidity distributionsRapidity distributions
symmetrized
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HADES coll. meeting, Oct. 31, 2007
Rapidity distributionsRapidity distributions
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HADES coll. meeting, Oct. 31, 2007
Rapidity distributionsRapidity distributions
symmetrized
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HADES coll. meeting, Oct. 31, 2007
LVL1 trigger events - efficiency corrected
within HADES acceptance and extrapolated to full solid angle
Pion multiplicities IPion multiplicities I
Extrapolation to all rapidities
A – based on UrQMD
B – based on PLUTO
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HADES coll. meeting, Oct. 31, 2007
PLUTO simulationsPLUTO simulations
Variations of extrapolation factor within 3% for both 1 and 2 A GeV data
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HADES coll. meeting, Oct. 31, 2007
LVL1 trigger events - efficiency corrected, within HADES acceptance
Systematic errors from reconstruction efficiency?
1) N(p+d)exp/N(p)UrQMD same within 6%
2) track multiplicity distributions Exp vs UrQMD
reasonably agree
3) sectorwise analysis - error within 5%
Pion multiplicities IIPion multiplicities II
LVL1 trigger events extrapolation from HADES acceptance to 4 and all momenta - using UrQMD and measured anisotropy =>M = 0.53 for 1 A GeV and 1.29 for 2 A GeV - used for normalization of di-lepton spectra
Systematic errors ? - possibly small, extrapolation factor only ~ 1.5,
study using PLUTO show small deviations, still 10% difference between UrQMD and PLUTO
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HADES coll. meeting, Oct. 31, 2007
Pion multiplicities IIIPion multiplicities IIIcentrality selection
by the LVL1 trigger:
estimate of Npart :
8.6 and 8.4 for 1 and 2 A GeV
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HADES coll. meeting, Oct. 31, 2007
Pion multiplicities per participantPion multiplicities per participant
1 A GeV 2 A GeV
HADES 0.061 ± 0.007 0.153 ± 0.016
Kaos0.061 ± 0.009 ± ??
Taps ( 0 )0.056 ± 0.004 + 11% 0.138 ± 0.014 + 23%
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HADES coll. meeting, Oct. 31, 2007
Summary
• charged meson production from C+C at 1 and 2 A GeV studied
• new results:
multiplicities - in large acceptance
polar anisotropies - momentum dependence
mT fits - one vs two slopes
rapidity distributions - rapidity width
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HADES coll. meeting, Oct. 31, 2007
Backup slides
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HADES coll. meeting, Oct. 31, 2007
Principle:for each track a probability that it is of a particle type h is calculated, for all possible particle types Bayes theorem implementedcut on the resulted probability set to decide on PID
Input:for each track (track candidate) with a given momentum we have a set of independent measured variablesin HADES: velocity, energy loss, RICH response, MDC hit, SHOWER response
Output:- a probability, that a given track corresponds to the particle type h- efficiency and purity for a selected cut
Particle Identification MethodParticle Identification Method
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HADES coll. meeting, Oct. 31, 2007
Experimental and analysis Experimental and analysis
detailsdetails November 2002 C+C 2 AGeV 200*106 events: 56% LVL1 trigger + 44% LVL2 trigger only 2 sectors with 4 chambers
20 M events (gen4 dst’s) used for analysis (days 348-350, 1st level trigger events)
UrQMD simulations - 47 M events (gen4) used for parameter production 20 M events (gen4) used for analysis
August 2004 C+C 1 AGeV 650*106 events: 75% LVL1 trigger + 25% LVL2 trigger
20 M events (gen2 dst’s) used for analysis (day 250, 1st level trigger events)
UrQMD simulations - 47 M events (gen2) used for parameter production 20 M events (gen2) used for analysis
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HADES coll. meeting, Oct. 31, 2007
Theta_cm distributions - Kick vs RKTheta_cm distributions - Kick vs RK
dN/d cos(cm) ~ 1. + A2 ∙ cos2(cm)
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HADES coll. meeting, Oct. 31, 2007
Kick track multiplicities - exp vs UrQMD
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HADES coll. meeting, Oct. 31, 2007
pt distributions - exp vs UrQMD vs PLUTOmidrapidity
midrapidity