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Quark Matter 2008, Jaipur. Outline February 9, 2008Quark Matter 2008 2 Results –dN/dy –Stopping Results –dN/dy –Stopping Summary and discussion Experiment.

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Presentation on theme: "Quark Matter 2008, Jaipur. Outline February 9, 2008Quark Matter 2008 2 Results –dN/dy –Stopping Results –dN/dy –Stopping Summary and discussion Experiment."— Presentation transcript:

1 Quark Matter 2008, Jaipur

2 Outline February 9, 2008Quark Matter 2008 2 Results –dN/dy –Stopping Results –dN/dy –Stopping Summary and discussion Experiment and motivation

3 Motivation: reference to understand baryon transport February 9, 2008Quark Matter 2008 3 At RHIC, the mid- rapidity region is almost net-proton free. Large rapidity loss =2 in central Au+Au collisions BRAHMS PRL 93, 102301 (2004) At RHIC, the mid- rapidity region is almost net-proton free. Large rapidity loss =2 in central Au+Au collisions BRAHMS PRL 93, 102301 (2004)

4 Collisions systems at 200 GeV p+p –Minimum bias d+Au –Minimum bias –Central 0-30% =13.6±0.5 –Semi-central 30-60% –Peripheral 60-80% Au+Au –Central 0-5% (PRL93) =357±10 February 9, 2008Quark Matter 2008 4 p p p p d d Au Projectile Target

5 Particle spectra: p+p collisions February 9, 2008Quark Matter 2008 5 Positives in p+p Spectra are scaled by certain factors for the convenience of display y=0 y=3.5 y=0.9 y=0 y=3.5 y=0.9 y=0 y=3.5 y=0.9

6 Particle spectra: d+Au collisions February 9, 2008Quark Matter 2008 6 Positives in minimum bias d+Au Spectra are scaled by certain factors for the convenience of display y=0 y=3.0 y=1.0 y=0 y=3.0 y=0 y=3.0

7 Extract dN/dy from spectra: pion in p+p February 9, 2008Quark Matter 2008 7 y=0, fit by power law

8 Extract dN/dy from spectra: kaon February 9, 2008Quark Matter 2008 8 y=0, fit by exponential in m T

9 Extract dN/dy from spectra: p, p-bar and net-p February 9, 2008Quark Matter 2008 9 Fit by various functions Systematic uncertainties are dominated by extrapolation to p T =0 Boltzmann function Exponential function in p T

10 Rapidity density dN/dy: pions February 9, 2008Quark Matter 2008 10 d+Au collisions The centrality dependence shows the presence of the Au “target” source as well as the projectile deuteron one at forward rapidity. The distributions evolves into one similar to p+p in the most peripheral d+Au collisions The centrality dependence shows the presence of the Au “target” source as well as the projectile deuteron one at forward rapidity. The distributions evolves into one similar to p+p in the most peripheral d+Au collisions p+p collisions

11 Rapidity density dN/dy: kaons February 9, 2008Quark Matter 2008 11 d+Au collisions p+p collisions dN/dy for kaons drastically decreases with increasing rapidity in d+Au dN/dy for kaons changes slowly in p+p collisions at forward rapidity dN/dy for kaons drastically decreases with increasing rapidity in d+Au dN/dy for kaons changes slowly in p+p collisions at forward rapidity

12 Rapidity density dN/dy: protons February 9, 2008Quark Matter 2008 12 dN/dy for proton (p-bar) drastically decreases at forward rapidity Much more protons than p-bar in p+p collisions at forward rapidity the slow decrease trend for proton in the most peripheral d+Au collisions dN/dy for proton (p-bar) drastically decreases at forward rapidity Much more protons than p-bar in p+p collisions at forward rapidity the slow decrease trend for proton in the most peripheral d+Au collisions d+Au collisios p+p collisions

13 Mean p T of pion, kaon, proton February 9, 2008Quark Matter 2008 13 preliminary d+Au collisions p+p collisions no rapidity dependence shown in both systems, and no centrality dependence in d+Au for heavier particles, are larger no rapidity dependence shown in both systems, and no centrality dependence in d+Au for heavier particles, are larger

14 d+Au data: comparing to Au+Au February 9, 2008Quark Matter 2008 14 Pion in central d+Au vs central Au+Au Kaon in central d+Au vs central Au+Au =357±10, Central (0-5%) Au+Au: BRAHMS PRL94(2005)162301 =13.6±0.5, in which d ∼ 2.0, Au ∼ 11.6 scale ~4 could scale pions in central d+Au collisions to dN/dy in central Au+Au collisions =357±10, Central (0-5%) Au+Au: BRAHMS PRL94(2005)162301 =13.6±0.5, in which d ∼ 2.0, Au ∼ 11.6 scale ~4 could scale pions in central d+Au collisions to dN/dy in central Au+Au collisions

15 p+p data: comparing to central Au+Au data February 9, 2008Quark Matter 2008 15 Pion in p+p vs central Au+Au Kaon in p+p vs central Au+Au No scaling works for pions and kaons in p+p collisions =357±10, Central (0-5%) Au+Au: BRAHMS PRL94(2005)162301 No scaling works for pions and kaons in p+p collisions =357±10, Central (0-5%) Au+Au: BRAHMS PRL94(2005)162301

16 Summary on dN/dy Extraction and systematic uncertainties  large systematic uncertainties dominate by extrapolation to p T =0 Rapidity density for identified hadrons in d+Au and p+p collisions  dN/dy for pions, kaons decrease with increasing rapidity  Centrality dependence shows target nucleus plays a role in particle production at forward rapidity, though not as important as projectile nucleus comparing to the central (0-5%) Au+Au collisions  Scaling works for pions in central d+Au collisions (if the average number of participants is 4), but not for kaons  Scaling does not work at all in p+p collisions February 9, 2008Quark Matter 2008 16

17 Stopping: net-proton in p+p collisions February 9, 2008Quark Matter 2008 17 comparison to models More proton at forward rapidity Experiemental data favors HIJING/B (v1.1) more than PYTHIA model More proton at forward rapidity Experiemental data favors HIJING/B (v1.1) more than PYTHIA model - version 1.1

18 Stopping: net-proton in d+Au collisions February 9, 2008Quark Matter 2008 18 Centrality dependence in d+Au collisions when dN/dy for net-proton goes from mid-rapidity to forward rapidity: there is not much difference for net-proton dN/dy in central d+Au collisions (rapidity shifted peak has been flattened ) while net-proton rapidity density increases in semi-cental and pheripheral collisions, which is similar to dN/dy in p+p collisions when dN/dy for net-proton goes from mid-rapidity to forward rapidity: there is not much difference for net-proton dN/dy in central d+Au collisions (rapidity shifted peak has been flattened ) while net-proton rapidity density increases in semi-cental and pheripheral collisions, which is similar to dN/dy in p+p collisions

19 Net-proton: d+Au & p+p vs central Au+Au February 9, 2008Quark Matter 2008 19 net-proton in central Au+Au =357±10 ref BRAHMS PRL93(2003)102301 =13.6±0.5, in which d ∼ 2.0, Au ∼ 11.6 isospin correction factor 0.6: ref Proc. 17th Winter Workshop on Nuclear Dynamics (2001) nucl-exp/0106017 p+p vs central Au+Au Central d+Au vs Au+Au at mid-rapidity, net-proton mainly comes from both deuteron and gold sides, but at forward rapidity, mainly coming from the deuteron side at mid-rapidity, more net-proton in central Au+Au collisions, indicates baryon transport from forward rapidity to mid-rapidity

20 Summary and discussion Rapidity density for identified hadrons in d+Au and p+p collisions are compared with central Au+Au results  Projectile nucleus (Au, d, p) contribute the most to particle production at forward rapidity, There is though a contribution from the target (Au) Stopping, net-proton in d+Au and p+p collisions  Scaling with number of participants (proton participant when comparing to p+p result) from projectile at forward rapidity works well in both d+Au and p+p systems.  but not well at mid-rapidity, indicating more protons in central Au+Au collisions have been transported from forward rapidity to the mid- rapidity comparing to that in p+p collisions. Even more in central d+Au collisions is seen, suggests that target Au nucleus in the asymmetric system partially get involved in the proton production. February 9, 2008Quark Matter 2008 20

21 Thank you! February 9, 2008Quark Matter 2008 21

22 Particle spectra: p+p collisions February 9, 2008Quark Matter 2008 22 Negatives in p+p Spectra are scaled by certain factors for the convenience of display y=0 y=3.5 y=0.9 y=0 y=3.5 y=0.9 y=0 y=3.5 y=0.9

23 February 9, 2008Quark Matter 2008 23 Particle spectra: d+Au collisions Negatives in minimum bias d+Au Spectra are scaled by certain factors for the convenience of display y=0 y=3.0 y=1.0 y=0 y=3.0 y=0 y=3.0

24 Particle identification: TOFW and RICH February 9, 2008Quark Matter 2008 24 MRS: TOFWFS: RICH

25 Extract dN/dy from spectra: p, p-bar and net-p February 9, 2008Quark Matter 2008 25 Exponential function in pT At forward rapidity y=3 Fit functions: Exponential in p T Boltzmann function Large systematic errors result from the extrapolation to p T =0 Boltzmann function

26 Centrality dependence of February 9, 2008Quark Matter 2008 26 preliminary

27 Backup slides: published Au+Au 0-5% February 9, 2008Quark Matter 2008 27

28 Why 0.6? February 9, 2008Quark Matter 2008 28 Stopping in Relativistic Heavy Ion Reactions - From SIS to RHIC By F. Videbaek nucl-exp/0106017, Heavy Ion Phys. 15 (2002) 303-313

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