在质心能量平方根√(sNN)=130 GeV的金离子与金离子碰撞中反质子与质子比率的快度依赖性
Rapidity dependence of antiproton-to-proton ratios in Au+Au collisions at square root of (sNN) = 130 GeV.
作者信息
Bearden I G, Beavis D, Besliu C, Blyakhman Y, Brzychczyk J, Budick B, Bøggild H, Chasman C, Christensen C H, Christiansen P, Cibor J, Debbe R, Gaardhøje J J, Grotowski K, Hagel K, Hansen O, Holm A, Holme A K, Ito H, Jakobsen E, Jipa A, Jørdre J I, Jundt F, Jørgensen C E, Keutgen T, Kim E J, Kozik T, Larsen T M, Lee J H, Lee Y K, Løvhøiden G L, Majka Z, Makeev A, McBreen B, Murray M, Natowitz J, Nielsen B S, Olchanski K, Olness J, Ouerdane D, Planeta R, Rami F, Röhrich D, Samset B H, Sanders S J, Sheetz R A, Sosin Z, Staszel P, Thorsteinsen T F, Tveter T S, Videbaek F, Wada R, Wieloch A, Zgura I S
机构信息
Niels Bohr Institute, University of Copenhagen, Denmark.
出版信息
Phys Rev Lett. 2001 Sep 10;87(11):112305. doi: 10.1103/PhysRevLett.87.112305. Epub 2001 Aug 24.
Measurements, with the BRAHMS detector, of the antiproton-to-proton ratio at midrapidities and forward rapidities, are presented for Au+Au reactions at square root of [s(NN)] = 130 GeV, and for three different collision centralities. For collisions in the 0%-40% centrality range, we find N(&pmacr;)/N(p) = 0.64+/-0.04((stat))+/-0.06((syst)) at y approximately 0, 0.66+/-0.03+/-0.06 at y approximately 0.7, and 0.41+/-0.04+/-0.06 at y approximately 2. The ratios are found to be nearly independent of collision centrality and transverse momentum. The antiproton and proton rapidity densities vary differently with rapidity, and indicate a significant degree of collision transparency, although a net-baryon free midrapidity plateau (Bjorken limit) is not yet reached.
本文展示了使用BRAHMS探测器对质心能量为(\sqrt{s_{NN}} = 130) GeV的金离子与金离子碰撞，在中快度和前向快度下的反质子与质子比率的测量结果，以及三种不同碰撞中心度的情况。对于中心度在0%-40%范围内的碰撞，我们发现在(y\approx0)时，(N(\bar{p})/N(p)=0.64\pm0.04)（统计误差）(\pm0.06)（系统误差）；在(y\approx0.7)时，(N(\bar{p})/N(p)=0.66\pm0.03\pm0.06)；在(y\approx2)时，(N(\bar{p})/N(p)=0.41\pm0.04\pm0.06)。这些比率几乎与碰撞中心度和横向动量无关。反质子和质子的快度密度随快度的变化不同，并且表明了显著程度的碰撞透明度，尽管尚未达到净重子数为零的中快度平台（比约肯极限）。
Zotero 插件