» RHIC Polarimetry « Oleg Eyser for the RHIC Polarimetry Group 2014 RHIC Retreat, August 14.
Heavy Flavor Production in p+p Collisions in PHENX Experiment at RHIC
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Heavy Flavor Production in p+p Collisions in PHENX Experiment at RHIC
W. Xie (RBRC) for PHENIX Collaboration
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Motivation for Heavy Flavor measurements at RHIC
• An very important probe for study pQCD.
0D
D0
J/
K+
l
l
K-
e-/-
e+/+
e-/-
e+/+
• A very important Probe for studying properties of Hot Partonic Matter and Cold Muclear Matter
(See Xiaorong Wang’s talk in Heavy-ion section)
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Pioneering High Energy Nuclear Interaction eXperiment (460 participant from 57 institutions of 12 countries)
• Maximal Set of Observables– Photons, Electrons, Muons, ID-hadrons
• Highly Selective Triggering– High Rate Capability.– Rare Processes.
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How PHENIX Measure Heavy Flavor• high resolution tracking and
momentum measurement from Drift chamber.
Good electron identification from Ring Imaging Cherenkov detector (RICH) and Electromagnetic Calorimeter (EMCal).
High rate capability: powerful level-1 electron trigger
E/p
Hadronic background
J/Psi->ee
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Good momentum resolution and muon identification from ID and Trk.
High rate capability: powerful level-1 dimuon trigger
How PHENIX Measure Heavy Flavor
J/Psi->uu
J/Psi->uu
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Measure Open Heavy Flavor via electrons at midrapidity
Subtraction of “photonic” sources.• conversion of photons from hadron decays in material
• Dalitz decays of light mesons ()
Converter method• Comparison of e+/- spectra with and without converter
allows separation of photonic and non-photonic sources of single electrons.
measurement via -e coincidences • Yield of -e in vicinity of mass with mixed event
subtraction
cocktail
-e invariant mass
γe+
e-ConverterAu
Au
All 3 methods cross check each other and give consistent results
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TrackerIdentifier Absorber
Collision vertex range
Collision
Muon HadronAbsorberSymbols
Detector
1
1 : Hadrons, interacting and absorbed (98%),
2
2 : Charged /K's, “decaying into ” before absorber (≤1%),
3
3 : Hadrons, penetrating and interacting (“stopped”)
4
4 : Hadrons, “punch-through”, 5 : Prompt , ”desired signal”
5
zcoll zcollzcoll
Measure Open Heavy Flavor via muon at forward rapidity
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Prompt electron cross section at midrapidity
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PRELIMINARYPRELIMINARY
PRELIMINARY
Prompt Muon cross section at forward rapidity
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J/Psi Cross Section Measurement
The total cross section in p-p collisions is:
2.61+/-0.20(fit)+/-0.26(abs) µb
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J/Psi pT distribution
Fitting function:
A*[1+(pT/B)2]-6
<pT2>= 4.31±0.85
At midrapidity
<pT2>= 2.51±0.21
at forward rapidity
Run3 (Y=0)
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Run3 (Y=0)
<pT2>= 4.31±0.85
CSM
COM
CSM
COM
J/Psi pT distribution
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Upsilon Measurement PHENIX accumulated ~3pb-1 p-p collision during 2005 run.
1st Upsilons at RHIC !
Phenix muon arm
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Future Measurement
S. Lebedev
• We see Chi_c in run5 with 3pb-1
• We are expecting to accumulate a factor of 3 more luminosity in the current ongoing run6.
•RHICII:
•Detector Upgrade