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arXiv 1504.02771nucl-ex
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BNL和RHIC 2014的亮点

Highlights from BNL and RHIC 2014

M. J. Tannenbaum

摘要:

重点新闻从布鲁克海文国家实验室(BNL)和结果从相对论重离子对撞机(RHIC)在2013年7月至2014年6月期间。今年是新闻业繁忙的一年,最引人注目的是美国总统奥巴马。S. 2013年10月1日起,由于缺乏2014财年的批准预算,政府关闭16天。即使有这种不寻常的政府活动,RHIC的$\sqrt{s_{NN}}=200$ GeV Au+Au运行14是有史以来最好的,其积分亮度超过了所有以前运行的总和。此外,还有一个简短的他$^3$ +金运行,继续研究集体流动的小系统,这是加强了新的结果,确定粒子流在d+金。其他科学亮点也主要涉及"软(低$p_T$)“物理学,并辅之以RHIC金+金碰撞中硬散射部分子重建喷流的第一个初步结果。横向能量的测量($E_T$)在p-p,d+Au和Au+Au碰撞中的光谱,去年证明了组分夸克是所有3个系统中粒子产生的基本元素,得出的结论是,这两个-已被用来表示作为中心性函数的$E_T$分布的分量安纳托利只是组成夸克参与者数量的代理,以及对一个解释了U+U碰撞导致的令人惊讶的椭圆流。广泛讨论的最新测量在金+金的净电荷和净质子分布的累积量的分布和计划在RHIC的束能量扫描寻找QCD临界点,并在2011年ISSP期间的新闻稿暗示的索赔进行了比较。

英文摘要:

Highlights of news from Brookhaven National Laboratory (BNL) and results from the Relativistic Heavy Ion Collider (RHIC) in the period July 2013-June 2014 are presented. It was a busy year for news, most notably a U. S. Government shutdown for 16 days beginning October 1, 2013 due to the lack of an approved budget for FY2014. Even with this unusual government activity, the $\sqrt{s_{NN}}=200$ GeV Au+Au Run14 at RHIC was the best ever with integrated luminosity exceeding the sum of all previous runs. Additionally there was a brief He$^3$+Au run to continue the study of collective flow in small systems which was reinforced by new results presented on identified particle flow in d+Au. The other scientific highlights are also mostly concerned with ``soft (low $p_T$)'' physics complemented by the first preliminary results of reconstructed jets from hard-scattered partons in Au+Au collisions at RHIC . The measurements of transverse energy ($E_T$) spectra in p-p, d+Au and Au+Au collisions, which demonstrated last year that constituent quarks are the fundamental elements of particle production in all 3 systems, led to the conclusion that the two-component ansatz which has been used to represent $E_T$ distributions as a function of centrality is simply a proxy for the number of constituent quark participants as well as to an explanation of the surprising elliptical flow results from U+U collisions. An extensive discussion of the latest measurements in Au+Au of net-charge and net-proton distributions represented by Cumulants of the distributions and plans for a Beam Energy Scan at RHIC to look for a QCD critical point is presented and compared to the claim implied by a press release during the 2011 ISSP.

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