Bingchu Huang, USTC/BNL 1 Bingchu Huang (for STAR Collaboration) University of Science and Technology of China (USTC) Brookhaven National Laboratory (BNL)

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Presentation transcript:

Bingchu Huang, USTC/BNL 1 Bingchu Huang (for STAR Collaboration) University of Science and Technology of China (USTC) Brookhaven National Laboratory (BNL) STAR measurement on di-lepton spectrum from p+p collisions at 200 GeV STAR WWND 2011, Winter park, Colorado, Feb. 6-13, 2010

STAR Outline  Motivation  Di-electron production in 200GeV p+p collisions  Invariant mass distribution of e + e - pairs  Particle cocktail simulation  Light meson and heavy flavor components  Comparison with data  ω (782) yields  Summary & outlook Bingchu Huang, USTC/BNL 2 WWND 2011, Winter park, Colorado, Feb. 6-13, 2010

STAR Di-lepton measurement of p+p at 200 GeV Bingchu Huang, USTC/BNL 3 WWND 2011, Winter park, Colorado, Feb. 6-13, 2010 MeasurementsPhysics low mass thermal radiation of QGP; in-medium modifications of vector meson (    ), chiral symmetry restoration intermediate mass thermal radiation of QGP; heavy flavor modification; resonances in QGP large mass: heavy quarkonia T of QGP, color screening, quarkonium production mechanism p+p is a baseline for Au+Au. This analysis will focus on p+p 200 GeV analysis. It will provide a good reference for Au+Au topics:

STAR STAR Detector Bingchu Huang, USTC/BNL 4 Time Projection Chamber 1. Tracking 2. Ionization energy loss (dE/dx PID): 3. Coverage -1<  <1 Time Of Flight Timing resolution (<100ps) 2. Coverage: -0.9<  < Install (4% y2008, 72% y2009, 100% y2010) WWND 2011, Winter park, Colorado, Feb. 6-13, 2010 Particle ID: TOF Tracking: TPC

STAR STAR Time of Flight detector performance Bingchu Huang, USTC/BNL WWND 2011, Winter park, Colorado, Feb. 6-13, TOF PID: ( , K) ~ 1.6, proton ~ 3 GeV/c STAR Collaboration, PLB616(2005)8 TOF enables clean electron PID up to p T < 3 GeV/c. (STAR Collaboration, PRL94(2005)062301) M. Shao et al., NIMA 558(2006)419 |1/  -1|<0.03

STAR STAR Preliminary The dE/dx cut efficiency on e Electron ID Bingchu Huang, USTC/BNL 6 nσ e cut: f(p T )<nσ e <2. STAR Preliminary f(p T ) WWND 2011, Winter park, Colorado, Feb. 6-13, 2010 Event Cut : 300 M p+p 200 GeV events from year |vertexZ|<50 cm && |vpdVz-vertexZ|<6 cm ~107 M events after cut. High electron purity: 99%. Efficiency: greater than the 60% for the dE/dx cut.

STAR Di-lepton background Bingchu Huang, USTC/BNL WWND 2011, Winter park, Colorado, Feb. 6-13, Mix-event normalize to like-sign within GeV/c 2 Mix-event consistent with like-sign within 1-3 GeV/c 2 Cross-pair bg. can only be described by like-sign method. For minimum bias events, we subtracted like-sign bg at M ee <0.7 GeV/c 2, mix-event bg subtraction was applied at 0.7<M ee <3.5 GeV/c 2.

STAR Di-lepton invariant mass spectrum in p+p collisions --- low mass range Bingchu Huang, USTC/BNL WWND 2011, Winter park, Colorado, Feb. 6-13, Di-lepton at run9 p+p collisions: signal excess above background ω: S/B~0.7, significance: 5 σ  : S/B~1, significance: 4 σ

STAR Di-lepton invariant mass spectrum in p+p collisions --- full range Bingchu Huang, USTC/BNL WWND 2011, Winter park, Colorado, Feb. 6-13,

STAR Particle cocktail simulation: spectrum input Bingchu Huang, USTC/BNL WWND 2011, Winter park, Colorado, Feb. 6-13, Z. Tang et al., PRC 79,051901(R)(2009); M. Shao et al., J. Phys. G: Nucl. Part. Phys. 37 (2010) STAR: π , K S, K*, , ρ PHENIX: η, ω, J/  In GEANT simulation: input the particle Tsallis fit function; output the e + e - invariant mass cocktail. Same cuts were applied in simulation as in data. Tsallis blast-wave model (TBW) is an implementing Tsallis statistics in the Blast-Wave model and is used to fit identified particle spectra at RHIC. Parameters:  q-1: the degree of non-equilibrium.  T: the average temperature of the local source.  β: the average flow velocity (0 in p+p collisions).

STAR Source of ee pairs Mesons: – Dalitz: π 0 ω η η’ ϕ – Two body: ρ ω ϕ J/ψ Heavy flavor: – Bingchu Huang, USTC/BNL WWND 2011, Winter park, Colorado, Feb. 6-13,

STAR Dalitz decay --- π 0 ω η η’ ϕ Bingchu Huang, USTC/BNL WWND 2011, Winter park, Colorado, Feb. 6-13, NA60: Phys. Lett. B 677 (2009) PHYSICS REPORTS (Review Section of Physics Letters) 128, No. 6 (1985) 301— 376. phase space of ω :

STAR ρ line shape Bingchu Huang, USTC/BNL WWND 2011, Winter park, Colorado, Feb. 6-13, ρ→ee: use Γ e instead of Γ π in BW function. PHYSICAL REVIEW C 78, (2008) Described by a BW×PS function in ππ.

STAR Charm and bottom Bingchu Huang, USTC/BNL 14 ccbar: STAR measured cross section as input; STAR Collaboration, PRL94(2005) bb/cc ratio from PYTHIA Procedures: 1)Scale simulated b  e/NPE run8 to STAR published b  e/(B  e+D  e). 2)Compare simulation c  e and NPE run8 – scaled b  e. 3)Tune the shape of simulation c  e. 4)Reproduce and contributions. PRL 105, (2010)

STAR Cocktail comparison with data Bingchu Huang, USTC/BNL WWND 2011, Winter park, Colorado, Feb. 6-13, The cocktail simulation can describe p+p data. The enhanced yield in the LMR and IMR observed in the heavy ion collisions by HELIOS, NA38/50, NA60 and PHENIX etc.. STAR has 355M minimum-bias Au+Au events at 200 GeV to study the enhancement at those mass range. The p+p results is a baseline for Au+Au. Statistical errors only

STAR Bingchu Huang, USTC/BNL 16 Fit range GeV/c 2 ω raw yields fit Raw yield fit: two histograms combined fit 1) ω 2) rest components of the cocktail. Systematic uncertainty estimation: Take the other bg. particle yields uncertainty as systematic uncertainty.

STAR ω raw yields fit Bingchu Huang, USTC/BNL WWND 2011, Winter park, Colorado, Feb. 6-13, STAR Preliminary

STAR ω efficiency Bingchu Huang, USTC/BNL 18 ω embedding data correct the acceptance and TPC+TOF efficiency. For omega: |y|<1 For electron: |η| 0.2 STAR Preliminary Function only guide eyes.

STAR ω invariant yields Bingchu Huang, USTC/BNL WWND 2011, Winter park, Colorado, Feb. 6-13,

STAR ω invariant yields comparison Bingchu Huang, USTC/BNL 20 PHENIX results: arXiv: Z. Tang et al., PRC 79,051901(R)(2009) Tsallis fit is only the fit function of the previous published high p T ω yields reconstructed by hadron channel!

STAR Summary  STAR’s di-lepton measurement enabled by TOF detector.  Di-electron continuum measured in 200 GeV p+p collisions. Cocktail simulation is consistent with data.  The ω invariant yields are obtained, they are consistent with the PHENIX submitted results reconstructed by e+e- channel, and also consistent with the Tsallis fit of ω results from hadron channel. Outlook: 1. Systematic uncertainty estimation on continuum will be completed. 2. The p+p results provide a good reference for Au+Au. We will look into the Au+Au data at 200 GeV. Bingchu Huang, USTC/BNL WWND 2011, Winter park, Colorado, Feb. 6-13,

Bingchu Huang, USTC/BNL WWND 2011, Winter park, Colorado, Feb. 6-13, Thanks!

STAR Photonic electron rejection doesn’t help too much for pp analysis. Bingchu Huang, USTC/BNL 23

STAR Raw yields Bingchu Huang, USTC/BNL 24 STAR Preliminary