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在LHC与ALICE的正向快度pp和p-Pb碰撞中J/ $ψ$和$ψ$（2S）的产生

Inclusive J/$ψ$ and $ψ$(2S) production in pp and p-Pb collisions at forward rapidity with ALICE at the LHC

Biswarup Paul

备注：
8 pages, 11 figures, contribution to the proceedings of the International Conference on Matter at Extreme Conditions : Then & Now, Bose Institute, Kolkata, India, January 15-17, 2014
发表信息：
Proceedings of the Indian National Science Academy, Vol 81 (2015), p. 179
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摘要：

ALICE合作研究了包容J/ $ψ$和$ψ$（2S）的生产在前向快速PP碰撞在$\sqrt{s} = 7$ TeV与ALICE μ子谱仪。对对应于积分光度$\mathcal{L}_{\rm int}$ = 1.35 pb $^{-1}$的数据样本进行了分析。测量了J/ $ψ$和$ψ$（2S）在横动量（0 $<$ $p_{\mathrm T}$ $<$ 20 GeV/ $c$）和快度（2.5 $<$ $y$ $<$ 4）上积分的产生截面。J/ $ψ$和$ψ$（2S）微分截面，在横向动量和快度，也被测量，显着扩展$p_{\mathrm T}$达到以前的测量在相同的$y$范围内进行。这些结果与先前发表的ALICE结果（$\mathcal{L}_{\rm int}$ = 15.6 nb $^{-1}$）以及LHCb合作组织进行的测量结果进行了比较。测量了在$p_{\mathrm T}$和$y$上积分的$ψ$（2S）/J/ $ψ$比值。这个比率也被评估为横向动量和快度的函数，并与LHCb测量进行比较。最后，对$\sqrt{s_{\rm NN}} = 5.02$ TeV的p-Pb碰撞截面、$ψ$（2S）/J/ $ψ$产额比、核修正因子（$R_{\rm pPb}$）和前向后产额比（$R_{\rm FB}$）的最新结果进行了讨论。

英文摘要：

The ALICE collaboration has studied inclusive J/$ψ$ and $ψ$(2S) production at forward rapidities in pp collisions at $\sqrt{s} = 7$ TeV with the ALICE Muon Spectrometer. The analysis has been carried out on a data sample corresponding to an integrated luminosity $\mathcal{L}_{\rm int}$ = 1.35 pb$^{-1}$. The production cross-sections of J/$ψ$ and $ψ$(2S), integrated over the transverse momentum (0 $<$ $p_{\mathrm T}$ $<$ 20 GeV/$c$) and rapidity (2.5 $<$ $y$ $<$ 4), have been measured. The J/$ψ$ and $ψ$(2S) differential cross-sections, in transverse momentum and rapidity, have also been measured, significantly extending the $p_{\mathrm T}$ reach of previous measurements performed in the same $y$-range. The results have been compared with the previously published ALICE results ($\mathcal{L}_{\rm int}$ = 15.6 nb$^{-1}$) and also with the measurement performed by the LHCb collaboration. The $ψ$(2S)/J/$ψ$ ratio, integrated over $p_{\mathrm T}$ and $y$, has been measured. This ratio has also been evaluated as a function of transverse momentum and rapidity and compared with the LHCb measurement. Finally, recent results on cross-sections, $ψ$(2S)/J/$ψ$ production ratio, nuclear modification factor ($R_{\rm pPb}$) and forward-to-backward yield ratio ($R_{\rm FB}$) in p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV will be discussed.

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