Energy dependence of πp>±p>, p and transverse momentum spectra for Au+Au collisions at and 200 GeV

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• 作者：B.I. Abelev ; M.M. Aggarwal ; Z. Ahammed ; B.D. Anderson ; D. Arkhipkin ; G.S. Averichev ; Y. Bai ; J. Balewski ; O. Barannikova ; L.S. Barnby ; S. Baumgart ; V.V. Belaga ; A. Bellingeri-Laurikainen ; R. Bellwied
• 关键词：Particle production ; Recombination ; Fragmentation ; Jet quenching ; Nuclear modification factor ; Particle ratios
• 刊名：Physics Letters B
• 出版年：2007
• 出版时间：1 November 2007
• 年：2007
• 卷：655
• 期：3-4
• 页码：104-113
• 全文大小：1345 K

文摘

We study the energy dependence of the transverse momentum (l43"">l43&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=afe330cd3a8f1b7205662c39f466b90c"" title=""Click to view the MathML source"">p_T) spectra for charged pions, protons and anti-protons for l44"">l44&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=207ef0d593a99fb474d9fdcc11cd6481"" title=""Click to view the MathML source"">Au+Au collisions at l45"">l45&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=0a78c717075e315603b11a0e2c621023"">p://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-4P192F9-1-FJ/0?wchp=dGLbVlb-zSkzV"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=17 width=88> and 200 GeV. Data are presented at mid-rapidity (l46"">l46&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=e2c8cc7fc402e4c26d8009c601cd3e59"" title=""Click to view the MathML source"">|y|<0.5) for l47"">l47&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=0c729e1012349a67b33bdb6f8cbe1930"">p://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-4P192F9-1-GB/0?wchp=dGLbVlb-zSkzV"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=14 width=143>. In the intermediate l48"">l48&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=57d0d76963bf33941ee26bdc6e0da7ad"" title=""Click to view the MathML source"">p_T region (l49"">l49&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=766552fca5e02a16f9ec12ebf6713aec"">p://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-4P192F9-1-V/0?wchp=dGLbVlb-zSkzV"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=14 width=123>), the nuclear modification factor is higher at 62.4 GeV than at 200 GeV, while at higher p_T (p://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-4P192F9-1-1M/0?wchp=dGLbVlb-zSkzV"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=14 width=96>) the modification is similar for both energies. The p/πp>+p> and p://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-4P192F9-1-2D/0?wchp=dGLbVlb-zSkzV"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=14 width=40> ratios for central collisions at 496e8801588e6946658"">p://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-4P192F9-1-5W/0?wchp=dGLbVlb-zSkzV"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=17 width=121> peak at p://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-4P192F9-1-68/0?wchp=dGLbVlb-zSkzV"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=14 width=96>. In the 49c6ab1c592a165b3fe11"" title=""Click to view the MathML source"">p_T range where recombination is expected to dominate, the p/πp>+p> ratios at 62.4 GeV are larger than at 200 GeV, while the p://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-4P192F9-1-39/0?wchp=dGLbVlb-zSkzV"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=14 width=40> ratios are smaller. For p://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-4P192F9-1-3P/0?wchp=dGLbVlb-zSkzV"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=14 width=96>, the p://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-4P192F9-1-43/0?wchp=dGLbVlb-zSkzV"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=14 width=40> ratios at the two beam energies are independent of 49e8e53f3d8e"" title=""Click to view the MathML source"">p_T and centrality indicating that the dependence of the p://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-4P192F9-1-4W/0?wchp=dGLbVlb-zSkzV"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=14 width=40> ratio on p_T does not change between 62.4 and 200 GeV. These findings challenge various models incorporating jet quenching and/or constituent quark coalescence.