Intrinsic fluctuations of the proton saturation momentum scale in high multiplicity p+p collisions

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• 作者：Larry McLerran^a ; ^b ; Prithwish Tribedy^a ; ^{ptribedy@bnl.gov" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Color glass condensate ; High multiplicity p+p collisions
• 刊名：Nuclear Physics A
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：945
• 期：Complete
• 页码：216-225
• 全文大小：320 K

文摘

High multiplicity events in p+p collisions are studied using the theory of the Color Glass Condensate. We show that intrinsic fluctuations of the proton saturation momentum scale are needed in addition to the sub-nucleonic color charge fluctuations to explain the very high multiplicity tail of distributions in p+p collisions. The origin of such intrinsic fluctuations is presumably non-perturbative in nature. Classical Yang Mills simulations using the IP-Glasma model are performed to make quantitative estimations. We find that fluctuations as large as O$\mathcal{O}$(1) of the average values of the saturation momentum scale can lead to rare high multiplicity events seen in p+p data at RHIC and LHC energies. Using the available data on multiplicity distributions we try to constrain the distribution of the proton saturation momentum scale and make predictions for the multiplicity distribution in 13 TeV p+p collisions.