An Tai QM2004, Oakland Jan.11-17, 2004 STAR 1 STAR measurements of open charm production in dAu collisions at √s NN =200 GeV An Tai For the STAR Collaboration.

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Presentation transcript:

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 1 STAR measurements of open charm production in dAu collisions at √s NN =200 GeV An Tai For the STAR Collaboration (1) Motivations (2) Data analysis (3) Results and Conclusions

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 2 Motivations:  Study heavy quark dynamic in medium, such as heavy quark energy loss in dense matter, and probe medium properties through heavy quarks  Gluon structure function of nuclei  Comparing ratios of different open charm species with the statistical model prediction--- is the charm quark hadronization modified by the thermal medium ? dAu provides an important reference to study heavy flavor production in Au+Au

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 3 (9.1%) we also measure D from its semi-leptonic decay to electrons in both dAu and pp collisions at √s NN =200 GeV Decay channels used in this analysis (6.2%) About 15 M dAu minbias events are used in the analysis

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 4 Mass plots from dAu data using event- mixing technique D±D± 7.4<pt<9.3 GeV/c D 0 +D 0 0 < p T < 3 GeV/c, |y| < 1.0 d+Au minbias 8.5< pt<11.0 GeV/c

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 5 D* ± 2.4<pt<3.5 GeV/c D* ± Signal D0  K-π+π0 (13.1%) 2.4<pt<3.5 GeV/c 00 DD  D 0 from D * decay (tagged D 0 )

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 6 Results Assuming σ(D*) = σ(D ± ) and scale σ(D*) and σ(D ± ) to match D0 by D*/D0=0.40 dAu minbias at √s=200 GeV = 1.12 ± 0.20 ± 0.37 mb = dn/dy*42*4/7.5 total multiplicity=4*dn/dy(|y|<0.5)

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 7 Lijuan Ruan’s talk (Thursday afternoon) A combined fit using D 0 and the electron data leads =1.36± 0.20 ± 0.39 mb The measurements of open charms are consistent with background-subtracted electron data in STAR ! The band is obtained from D decay based on the power-law fit to the measured open charm spectrum.

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 8 STAR background-subtracted electrons by EMC first time seeing beauty at RHIC ! Alex Suaide’s talk (Thursday afternoon) B decay dominated region

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 9 ratios --- consistent with other experiments CDF: hep-ex/ HERA: www-h1.de/h1/www/publications/conf_list.html e+e-: hep-ph/ Statistical model: A. Andronic etc. nucl-th/ and private communication.

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 10 Open charm spectrum is hard ! Phenix: Phys. Rev. Lett. 88, (2002) D. Kharzeev,hep-ph/

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 11 Charm quark hadronization at RHIC NLO pQCD predictions are provided by R. Vogt, Int. J. Mod. Phys. E12 (2003) 211 bare c-quark spectrum, normalized to measured dn/dy D spectrum would be drop by a factor of 3 at pt~10GeV/c when Peterson fragmentation function is set in. Harder fragmentation function, like, δ(z-1), is needed c-quark may hadronize through recombination mechanism.

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 12 Conclusion I D0,D* and D± are first measured in dAu run at √s=200 GeV using STAR TPC with a p T coverage of 0<pt<11 GeV/c =1.12 ± 0.20 ± 0.37 mb from directly-measured open charm and =1.36± 0.20 ± 0.39 mb from D 0 and the single electron measurement D*/D 0 = 0.40±0.09(stat)±0.13(sys), consistent with other experimental results.

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 13 Conclusion II STAR measured D spectrum and single electron are consistent. The measured D pt spectrum coincides with the bare-quark distribution from the NLO calculation. A hard D meson p T spectrum may be obtained from k T factorization scheme (Kharzeev et al), or charm quark recombination or very hard charm fragmentation function (δ(z-1) function).

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 14

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 15 broadening and c-quark fragmentation at fixed target experiment Bare c-quark spectrum After and fragmentation ε=0.06 π+A scattering at 350 GeV/c momentum loss due to fragmentation can be counter-balanced by initial

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 16 Charm quark hadronization at RHIC ---- harder fragmentation function or c-quark recombination ?? MRST HOPeterson’s function ε=0.06MRST HOPeterson’s function ε=0.06 c quark =1 (GeV)^2 =1.37 (GeV)^2c quark =1 (GeV)^2 =1.37 (GeV)^2 After and fragmentationAfter and fragmentation A factor of ~3 drop at pt~10 GeV/cA factor of ~3 drop at pt~10 GeV/c NLO pQCD predictions are provided by R. Vogt bare c-quark spectrum, normalized to measured dn/dy MRST HO Peterson’s function ε=0.06 c quark =1 (GeV)^2 =1.37 (GeV)^2 After and fragmentation A factor of ~3 drop at pt~10 GeV/c

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 17 KπPut M(Kπ) into D0 histogram Kπ + π~ If 0.143<ΔM=M(Kππs)-M(Kπ)<0.148 GeV/c^2 Put M(Kπ) into D0-from-D* histogram If 1.82<M(Kπ)<1.9 GeV/c^2 Put ΔM=M(Kππs)-M(Kπ) into D* histogram Analysis procedure Put M(Kππ~) into D± histogram If( , π~  πs

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 18 D± signal is real 0-40% centrality D±D± K-π+π- ---wrong charge combination No signal ! Raw countings are close for D+ and D- D- D+

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 19 signal from BR=6.2% 0.53GeV < m(ρ) < 0.95GeV 8.5< pt<11.0 GeV/c

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 20 signal is real 0-40% centrality wrong charge combination No signal !

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 21 ratios (1) Assume D*=D 0 (dir) D 0 =D 0 (dir)+0.68D *± +D* 0 D*/D 0 =0.37 (2) Assume D*=3D 0 (dir) D 0 =D*/3+0.68D* ± +D* 0 D*/D 0 =0.50 CDF: hep-ex/ HERA: www-h1.de/h1/www/publications/conf_list.html e+e-: hep-ph/ Statistical model: A. Andronic etc. nucl-th/ and private communication.

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 22 Mass and width: Measured vs Monte Carlo Agree well width is dominated by detector resolutions mass=1.864± GeV mass(MC)=1.868±0.002 GeV Sigma=13.83±3.7 MeV Sigma(MC)=14.9±1.6 MeV mass=1.867±0.006 GeV mass(MC)=1.865 GeV Sigma=13.7±6.8 MeV Sigma(MC)=14.5 MeV mass=0.1467± GeV mass(MC)= GeV Sigma=0.43±0.14 MeV Sigma(MC)=0.67 MeV

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 23 Pythia parameters Phenix-tuned pythia parameters: =1.5 GeV/c, mc=1.25 GeV/c^2 K-factor=3.5, CTEQ5L, PARP(67)=1 σ(ccbar)=653μb STAR tuned pythia parameters =2.0 GeV/c, mc=1.7 GeV/c^2, K-factor=2.2, CTEQ5M1, PARP(67)=4 σ(ccbar)=1078 μb

An Tai QM2004, Oakland Jan.11-17, 2004 STAR 24