학술논문
Rapidity dependence of deuteron production in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
Document Type
Working Paper
Author
BRAHMS Collaboration; Arsene, I.; Bearden, I. G.; Beavis, D.; Bekele, S.; Besliu, C.; Budick, B.; Bøggild, H.; Chasman, C.; Christensen, C. H.; Christensen, P.; Dalsgaard, H. H.; Debbe, R.; Gaardhøje, J. J.; Jørgensen, C. E.; Hagel, K.; Ito, H.; Jipa, A.; Johnson, E. B.; Karabowicz, R.; Katrynska, N.; Kim, E. J.; Larsen, T. M.; Lee, J. H.; Løvhøiden, G.; Majka, Z.; Murray, M.; Natowitz, J.; Nielsen, B. S.; Nygaard, C.; Ouerdane, D.; Pal, D.; Qville, A.; Rami, F.; Ristea, C.; Ristea, O.; Röhrich, D.; Sanders, S. J.; Staszel, P.; Tveter, T. S.; Videbæk, F.; Wada, R.; Yang, H.; Yin, Z.; Zgura, S.
Source
Phys.Rev.C83:044906,2011
Subject
Language
Abstract
We have measured the distributions of protons and deuterons produced in high energy heavy ion Au+Au collisions at RHIC over a very wide range of transverse and longitudinal momentum. Near mid-rapidity we have also measured the distribution of anti-protons and anti-deuterons. We present our results in the context of coalescence models. In particular we extract the "volume of homogeneity" and the average phase-space density for protons and anti-protons. Near central rapidity the coalescence parameter $B_2(p_T)$ and the space averaged phase-space density $ (p_T)$ are very similar for both protons and anti-protons. For protons we see little variation of either $B_2(p_T)$ or the space averaged phase-space density as the rapidity increases from 0 to 3. However both these quantities depend strongly on $p_T$ at all rapidities. These results are in contrast to lower energy data where the proton and anti-proton phase-space densities are different at $y$=0 and both $B_2$ and $f$ depend strongly on rapidity.
Comment: Document updated after proofs received from PRC
Comment: Document updated after proofs received from PRC