Open charm hadron production via hadronic decays at STAR

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Presentation transcript:

Open charm hadron production via hadronic decays at STAR David Tlusty NPI ASCR, CTU Prague for the STAR collaboration

Outline Motivation Analysis methods, Detector Setup and Particle Identification D0 and D* in p+p 200 GeV collisions D0 in Au+Au 200 GeV collisions Analysis status on D0 and D* in p+p 500 GeV collisions Summary David Tlusty Hard Probes 2012, Cagliari

Why to study heavy quarks X. Zhu, et al, PLB 647, 366(2007) Produced in initial hard partonic collisions Sensitive to initial gluon density and gluon distribution. Due to it’s large mass a good pQCD test at RHIC collision energies. Heavy quark mass is believed to be external to QCD (=> stay heavy even in QGP) Couple differently with the medium than light quarks. Reveal critical features of the medium Spectra could be significantly modified but still would retain memory about their interaction history David Tlusty Motivation

How to measure charm quarks Indirect measurements through semi-leptonic decay can be triggered easily (high pT) higher B.R. indirect access to the heavy quark kinematics contribution from both charm and bottom hadron decays non-photonic electrons in STAR by Olga HAJKOVA (parallel room T3: Thursday 14:00 - 14:20) Direct reconstruction direct access to heavy quark kinematics difficult to trigger (high energy trigger only for correlation measurements) smaller Branching Ratio (B.R.) large combinatorial background (need handle on decay vertex) David Tlusty 2. Analysis Methods, Detector Setup and PID

2. Analysis Methods, Detector Setup and PID The STAR detector VPD: minimum bias trigger TPC: PID, tracking TOF: PID (b, time resolution = 110 ps in p+p, = 100 ps in Au+Au) BEMC: remove pile-up tracks, Energy triggers, E/p Year 2009 72% of full TOF Year 2010/2011 100% of full TOF David Tlusty 2. Analysis Methods, Detector Setup and PID

Hadron Identification STAR preliminary Kaons: TOF only Pions: TOF if available, otherwise TPC dE/dx with matching to BEMC required to remove pile-up tracks STAR preliminary STAR preliminary David Tlusty 2. Analysis Methods, Detector Setup and PID

D0 and D* signal in p+p 200 GeV arXiv: 1204.4244 K*0 K*0 K2*(1430) arXiv: 1204.4244 D0 D0 D0 mass window zoom D0 mass window zoom p+p minimum bias 105 M Different methods reproduce combinatorial background. Consistent results from two background methods. D0 D0 David Tlusty 3. D0 and D* in p+p 200 GeV collisions

D0 and D* pT spectra in p+p 200 GeV D0 scaled by ND0/Ncc= 0.56[1] D* scaled by ND*/Ncc= 0.22[1] Xsec = dN/dy|ccy=0 * F * spp F = 4.7 ± 0.7 scale to full rapidity. spp(NSD) = 30 mb arXiv: 1204.4244 The charm cross section at mid-rapidity is: The charm total cross section is extracted as: Consistent with FONLL[2] upper limit. [1] C. Amsler et al. (Particle Data Group), PLB 667 (2008) 1. [2] Fixed-Order Next-to-Leading Logarithm: M. Cacciari, PRL 95 (2005) 122001. David Tlusty 3. D0 and D* in p+p 200 GeV collisions

4. D0 in Au+Au 200 GeV collisions D0 signal in Au+Au 200 GeV STAR, Quark Matter 2011, JPG 38, 124142 (2011) K*0 D0 Minimum bias 0-80% 280M Au+Au 200 GeV events. S/√(S+B) = 8 Mass = 1863 ± 2 MeV (PDG value is 1864.5 ± 0.4 MeV) Width = 12 ± 2 MeV David Tlusty 4. D0 in Au+Au 200 GeV collisions

Number-of-binary-collisions scaling STAR, Quark Matter 2012, JPG 38, 124142 (2011) arXiv:1204.4244. Measurements from Year 2009 p+p D0+D* and Year 2010 Au+Au D0 are consistent Charm cross section in Au+Au 200 GeV is estimated from D0 cross section, scaled by fragmentation ratio 0.56: Cross section at mid-rapidity: 186 ± 22 (stat.) ± 30 (sys.) ± 18 (norm.) mb Total cross section: 876 ± 103 (stat.) ± 211 (sys.) mb [1] FONLL: M. Cacciari, PRL 95 (2005) 122001. [2] NLO: R. Vogt, Eur.Phys.J.ST 155 (2008) 213 [3] PHENIX e: A. Adare, et al., PRL 97 (2006) 252002. [4] STAR d+Au: J. Adams, et al., PRL 94 (2005) 62301 Charm cross section follows number of binary collisions scaling => Charm quark produced at early stage of collisions. David Tlusty 4. D0 in Au+Au 200 GeV collisions

4. D0 in Au+Au 200 GeV collisions D0 RAA vs pT D0 Au+Au 0-80% divided by p+p with Nbin scaled. Below 3 GeV/c, RAA consistent with unity. Consistent with D0 yield Nbin scaling behavior. ALICE results shows D meson is suppressed at high pT. At present, The Non-photonic Electrons analysis is the key to study high pT charm and bottom production at RHIC. Heavy Flavor Tracker, the new STAR subsystem, will make a significant improvement David Tlusty 4. D0 in Au+Au 200 GeV collisions

5. D0 and D* in p+p 500 GeV collisions D0 signal in p+p 500 GeV STAR preliminary Like-sign background subtracted. S/√(S+2B) = 4 from 52 M minimum bias events STAR preliminary Rotated background subtracted. S/√(S+2B) = 4.1 David Tlusty 5. D0 and D* in p+p 500 GeV collisions

5. D0 and D* in p+p 500 GeV collisions Minimum bias events High tower triggered events STAR preliminary STAR preliminary 2< pT < 20 GeV/c 2< pT < 20 GeV/c David Tlusty 5. D0 and D* in p+p 500 GeV collisions

Summary D0 and D* are measured in p+p 200 GeV up to 6 GeV/c the first direct measurement at RHIC consistent with FONLL upper limit. Sufficient D0 and D* signal from p+p 500 GeV collisions promises first open charm cross section calculation in such energy with pT coverage being 0.4 – 7.0 GeV/c D0 are measured in Au+Au 200 GeV up to 5 GeV/c. 1) Charm cross sections at mid-rapidity follow number of binary collisions scaling 2) RAA is consistent with unity for pT < 3 GeV/c. => charm is produced at early stage of the collisions. Run 2011 Au+Au data with twice more statistics will allow us to extend the RAA pT range up to 7 – 8 GeV/c. David Tlusty 6. Summary

Backup Slides David Tlusty, NPI ASCR WWND Puerto Rico

Heavy Flavor Tracker TPC SSD IST PXL FGT STAR Heavy Flavor Tracker Project. Reconstruct secondary vertex. Dramatically improve the precision of measurements. Address physics related to heavy flavor. v2 : thermalization RCP: charm quark energy loss mechanism. David Tlusty

Systematic error study Raw Counts – Difference between methods nFitPoints - difference between MC(nFitPts>25)/MC(nFitPts>15) and Data(nFitPts>25)/Data(nFitPts>15) 3) DCA - difference between MC(dca<1)/MC(dca<2) and Data(dca<1)/Data(dca<2) David Tlusty

Pile-up removal pp collisions peak luminosity Lpeak = 5*1031 cm-2s-1 in year 2009. EventRate = Lpeak*sNSD(30 mb) = 1.5 MHz TPC readout ~ 80 ms => TPC sees tracks from 120‎ collisions. Pile-ups are removed by‎ ‎ |VpdVz - TpcVz| < 6cm cut ‎ TPC PPV reconstruction algorithm ‎‎ David Tlusty

Charm cross section vs David Tlusty