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Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 1 Study B and D Contributions to Non- photonic Electrons via Azimuthal Correlations between Non-

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Presentation on theme: "Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 1 Study B and D Contributions to Non- photonic Electrons via Azimuthal Correlations between Non-"— Presentation transcript:

1 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 1 Study B and D Contributions to Non- photonic Electrons via Azimuthal Correlations between Non- Photonic Electrons and Charged Hadrons Xiaoyan Lin 林晓燕 (for the STAR Collaboration) Central China Normal University Wuhan, P.R. China

2 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 2  Motivation  Data analysis ---- Electron identification ---- Photonic electron background ---- Electron-hadron correlations  Preliminary results of B/(B+D)  Summary Outline

3 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 3 Heavy quark R AA has the similar magnitude as light quark R AA. The high p T region non-photonic electron R AA is surprising ! Where is the bottom contribution? Features in Heavy Quark Measurements at RHIC ----Non-Photonic Electron R AA

4 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 4 The decay kinematics of D and B mesons are different! The same D and B v 2 can lead to very different non- photonic electron v 2 ! Features in Heavy Quark Measurements at RHIC ----Non-Photonic Electron v 2 Y. Zhang, hep-ph/0611182 PYTHIA Reduction of v 2 at p T > 2 GeV/c. Bottom contribution??

5 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 5 Quantitative understanding of features in heavy quark measurements requires experimental measurement of B and D contributions to non-photonic electrons ! Such information should be best obtained from direct measurement of hadronic decays of charm and bottom mesons. This motivates the STAR vertex detector upgrade! See Talk by Andrew Rose (1.4) B and D Contributions to Electrons Poor (wo)man’s approach to measure B/D contributions to non-photonic electrons ---- e-h correlations X.Y. Lin, hep-ph/0602067

6 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 6 PYTHIA Simulation of e-h Correlations B D Associated p T > 0.3 GeV/c. Significant difference in the near-side correlations. Width of near- side correlations largely due to decay kinematics. X.Y. Lin, hep-ph/0602067

7 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 7 Major Detectors Used Time Projection Chamber (TPC) Electro-Magnetic Calorimeter (EMC) Shower Maximum Detector (SMD) Data Sample: p+p collisions at  s NN = 200 GeV in year 5 run. 2.37 million EMC HT1 triggered events with threshold 2.6 GeV; 1.68 million EMC HT2 triggered events with threshold 3.5 GeV. Signal: Non-photonic electron Background: Hadron Photonic electron Charm decay Bottom decay Photon conversion π 0 Dalitz decay η Dalitz decay kaon decay vector meson decays

8 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 8 Electron ID Using TPC and EMC

9 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 9 The purity of electron sample is above 98% up to p T ~ 6.5 GeV/c. Electron ID Using TPC and EMC

10 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 10 The combinatorial background is small in p+p collisions. Reconstructed photonic = Opposite sign – Same sign. Photonic electron = reconstructed-photonic/ ε. ε is the background reconstruction efficiency calculated from simulations. m<100 MeV/c 2 Photonic Background Electron candidates are combined with tracks passing a loose cut on dE/dx around the electron band. The invariant mass for a pair of photonic electrons is small.

11 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 11 All Tracks Inclusive electron Non-photonic electronPhotonic electron Reco-photonic electron =OppSign - combinatorics Not-reco-photonic electron =(1/eff-1)*(reco- photonic) Pass EID cuts Procedure to Extract the Signal of e-h Correlations Semi-inclusive electron Signal: non-photonic = semi-inclusive +combinatorics-(1/eff-1)*reco-photonic Each item has its own corresponding Δφ histogram.

12 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 12 e-h Azimuthal Correlations after Bkgd. Subtraction

13 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 13 Use PYTHIA Curves to Fit Data Points Fit function: R*PYTHIA_B+(1-R)*PYTHIA_D R is B contribution, i.e. B/(B+D), as a parameter in fit function. B D

14 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 14 B/(B+D) consistent varying fit range. Use PYTHIA Curves to Fit Data Points

15 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 15 Preliminary Results: B Contribution.VS. p T Error bars are statistical only! Data uncertainty includes statistic errors and systematic uncertainties from: ---- photonic background reconstruction efficiency (dominant). ---- difference introduced by different fit functions. Preliminary data is within the range that FONLL calculation predicts. Non-zero B contribution is observed.

16 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 16  Non-photonic electron and charged hadron correlations are sensitive to D and B contributions to non-photonic electrons.  We have measured e-h correlations in 200 GeV p+p collisions.  The preliminary data indicates at p T ~ 4-6 GeV/c the measured B contribution to non-photonic electrons is comparable to D contribution based on PYTHIA model.  Our measurement of B/(B+D) provides a constraint to the FONLL prediction. Summary

17 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 17 Backup slides

18 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 18 Δφ non-pho = Δφ semi-inc + Δφ combinatorics - Δφ not-reco-pho = Δφ semi-inc + Δφ combinatorics - (1/eff -1) *Δφ reco-pho-no-partner Method to Extract the Signal of e-h Correlations non-pho. e = semi-incl. e +combinatorics - not-reco-pho. = semi-incl. e +combinatorics - (1/eff-1)*reco-pho. Note Δφ not-reco-pho = (1/eff -1) *Δφ reco-pho-no-partner ! Δφ reco-pho-no-partner is the reco-pho after removing the conversion partner. The photonic background has two parts: reco-pho and not-reco-pho. In electron yield or v 2 analysis, the not-reco-pho part can just be calculated by reco-photonic part after an efficiency correction, i.e. not-reco-photonic = (1/eff-1)*reco-pho. However, in e-h correlation analysis, that is different. The reco-pho electron means we find the conversion partner, while the not-reco-pho electron means we miss the conversion partner. The resulting e-h correlations for these two parts are different. If we use reco-pho part to calculate the not-reco-pho part, we have to remove the conversion partner of reco-pho part.

19 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 19 The distributions of ChiSquare.VS. ratio_B

20 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 20 The distributions of ChiSquare.VS. ratio_B

21 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 21 Preliminary Results: B Contribution.VS. p T

22 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 22 -3σ < z distance < 3σ and -3σ < φdistance < 3σ were set to remove lots of random associations between TPC tracks and BEMC points. Electron Identification: Projection Distance

23 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 23 PYTHIA Simulation: e p T.VS. parent p T  C-quark needs to have larger momentum than b-quark to boost the decayed electron to high p T.

24 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 24 PYTHIA Simulation: e p T.VS. hadron p T  The efficiency of associated p T cut is different between D decay and B decay. Therefore, it is better to use lower p T cut on the associated particles in order to avoid analysis bias!

25 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 25 PYTHIA Simulation: e p T.VS. hadron p T

26 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 26 PYTHIA parameters used in this analysis PYTHIA version: v6.22 δ fragmentation function used for both charm and bottom. Parameters for charm: PARP(67) = 4 (factor multiplied to Q 2 ) = 1.5 GeV/c m c = 1.25 GeV/c 2 K factor = 3.5 MSTP(33) =1 (inclusion of K factor) MSTP(32) = 4 (Q 2 scale) CTEQ5L PDF Parameters for bottom are the same as for charm except m b = 4.8 GeV/c 2. X.Y. Lin, hep-ph/0602067

27 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 27 Near-side width due to decay kinematics All hadronsHadrons from D Background with δ fragmentation function

28 Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 28 Near-side width does not strongly depend on FF 2.5-3.5 GeV/c 3.5-4.5 GeV/c 4.5-5.5 GeV/c 5.5-6.5 GeV/c Will be included in the systematic uncertainties in the future.

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