1 Identified Particle Dependence of Nuclear Modification Factors in d+Au Collisions at RHIC. Lee Barnby - University of Birmingham For the STAR Collaboration.

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Presentation transcript:

1 Identified Particle Dependence of Nuclear Modification Factors in d+Au Collisions at RHIC. Lee Barnby - University of Birmingham For the STAR Collaboration

2 Outline Motivation for d+Au measurements –Previous p+A results –Au+Au results STAR setup for d+Au run Nuclear modification factors in d+Au Implications for Au+Au interpretation Forward rapidity region Summary and outlook

3 Motivation Species dependent Cronin effect at lower energies. –Cronin effect decreasing with increasing √s. –Still existing at √s = 200 GeV? Final state explanation for high p T suppression and disappearance of back-to-back correlations in Au+Au but… –What about particle dependence of nuclear modification factors in Au+Au at intermediate p T ? RHIC provided d+Au rather than p+Au collisions purely for technical reasons.

4 Lower energy p+A measurements PRD 11, 3105 (1975) Cronin et. al Enhancement growing with p T Larger enhancement with heavier particle:     <  proton

5 Lower Energy Cronin effect data Ratio of per nucleon cross sections for p+W and p+Be collisions at √s=38.8 GeV –Enhancement varies with p T and with particle species p T GeV/c PRL 68, 452 (1992) Straub et al.

6 Lower Energy Cronin data (II) √s Cronin enhancement decreasing with increasing √s Certainly for , K Trend less clear for proton? Larger magnitude effect for p R W/Be PRL 68, 452 (1992) Straub et al.

7 Au+Au Nuclear Modification PRL 91, (2003) STAR

8 Au+Au Nuclear Modification PRL 91, (2003) STAR

9 Au+Au Nuclear Modification See poster by P. Sorensen (STAR) Different behaviour for  and K 0 in p T 2- 4 GeV range.

10 d+Au Nuclear Modification h ± STAR, PRL 91 (2003)

11 STAR Setup 10 M minimum bias d+Au events used. Main TPC at mid-rapidity measures charged tracks –Reconstruct “V0s”  p    and   s     –And “kinks” K ±  ±  K ±  ±   TOF at mid-rapidity identifies , K, p FTPC reconstructs charged tracks at forward rapidity (  ~ 3) –Used in centrality classification See poster C.Mironov

12 Spectra √s=200 GeV d+Au collisions K0SK0S P T [GeV/c]

13 Spectra √s=200 GeV p+p collisions See poster J. Adams & M. Heinz STAR Preliminary P T [GeV/c]

14 Nuclear modification factors R dAu K 0 s STAR Preliminary

15 Nuclear modification factors h ± K 0 s h ± data PRL 91 (2003) STAR Preliminary R dAu

16 Nuclear modification factors STAR Preliminary R dAu STAR TOF data nucl-ex/ h ± K 0 s proton

17 Nuclear modification factors STAR Preliminary R dAu STAR TOF data nucl-ex/ h ± K 0 s proton K ±

18 Nuclear modification factors STAR Preliminary R dAu STAR TOF data nucl-ex/ h ± K 0 s proton K ± 

19 Central to peripheral STAR Preliminary P T [GeV/c]

20 Au+Au interpretation Difference between identified particle  nuclear modification factors also seen in d+Au collisions. However they are smaller and unlikely to explain difference in R CP at intermediate p T Order 20% not a factor 2. Baseline for suppression in central Au+Au is actually is close to N binary scaling Depends on details of convoluting d+Au collisions

21 Au+Au Nuclear Modification

22 Spectra at forward rapidities  dN/d  STAR Preliminary See poster J. Putschke Minimum bias curve shows agreement with PHOBOS and with HIJING model Dotted lines are saturation model predictions for centrality selections

23 d+Au R CP at forward rapidities P T [GeV/c] R CP Au-Side R CP shows almost no variation with centrality d-side is interesting: more central is more suppressed

24 Summary and Outlook Particle dependence of nuclear modification factors in d+Au of order 20% unlikely to explain R CP differences in d+Au. More conspicuous differences at forward rapidity on d-side. More p+p data required to go further in p T and improve precision of R dAu measurement.