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arXiv 1307.3237nucl-exhep-ex
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$\sqrt{s_{\rm NN}}$ = 5.02 TeV时p-Pb碰撞中$\rm π$，K和p的长程角关联

Long-range angular correlations of $\rm π$, K and p in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV

ALICE Collaboration

备注：
26 pages, 4 captioned figures, 2 tables, authors from page 20, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/445
发表信息：
Phys. Lett. B 726 (2013) 164-177
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摘要：

利用ALICE探测器在横动量范围为$0.3 < p_{\rm T} < 4$ GeV/ $c$的核子-核子质心能量为5.02 TeV的p-Pb碰撞中测量了未识别带电触发粒子与各种带电缔合粒子（未识别粒子、π介子、K介子、质子和反质子）之间的角关联。在赝快度范围$|η_{\rm lab}|<0.8$内得到了以每个触发粒子的关联产额表示的关联。傅立叶系数提取的长程相关投影到方位角差和研究作为一个函数的$p_{\rm T}$和事件的多重性的间隔。在高多重性事件中，质子的二阶系数$v_2^p$被观察到小于π介子的二阶系数$v_2^π$，直到大约$p_{\rm T} = 2$ GeV/ $c$。为了减少由于喷流的相关性，从高多重性事件中减去低多重性事件中测量的每次触发产额。一个双脊结构，得到所有的粒子种类。这种结构的傅里叶分解表明，π介子和K介子的二阶系数是相似的。$v_2^p$被发现是较小的在低$p_{\rm T}$和较大的在较高的$p_{\rm T}$比$v_2^pi$，与交叉发生在约2 GeV。这在性质上类似于在重离子碰撞中观察到的椭圆流模式。在低横向动量的质量排序效果是一致的流体动力学模型计算假设一个集体膨胀系统的预期。

英文摘要：

Angular correlations between unidentified charged trigger particles and various species of charged associated particles (unidentified particles, pions, kaons, protons and antiprotons) are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV in the transverse-momentum range $0.3 < p_{\rm T} < 4$ GeV/$c$. The correlations expressed as associated yield per trigger particle are obtained in the pseudorapidity range $|η_{\rm lab}|<0.8$. Fourier coefficients are extracted from the long-range correlations projected onto the azimuthal angle difference and studied as a function of $p_{\rm T}$ and in intervals of event multiplicity. In high-multiplicity events, the second-order coefficient for protons, $v_2^p$, is observed to be smaller than that for pions, $v_2^π$, up to about $p_{\rm T} = 2$ GeV/$c$. To reduce correlations due to jets, the per-trigger yield measured in low-multiplicity events is subtracted from that in high-multiplicity events. A two-ridge structure is obtained for all particle species. The Fourier decomposition of this structure shows that the second-order coefficients for pions and kaons are similar. The $v_2^p$ is found to be smaller at low $p_{\rm T}$ and larger at higher $p_{\rm T}$ than $v_2^pi$, with a crossing occurring at about 2 GeV. This is qualitatively similar to the elliptic-flow pattern observed in heavy-ion collisions. A mass ordering effect at low transverse momenta is consistent with expectations from hydrodynamic model calculations assuming a collectively expanding system.

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