Triple-parton scatterings in proton-nucleus collisions at high energies

被引：11

作者：

d'Enterria, David ^{[1
]}

Snigirev, Alexander M. ^{[2
,3
]}

机构：

[1] CERN, EP Dept, CH-1211 Geneva, Switzerland

[2] Lomonosov Moscow State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119991, Russia

[3] JINR, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia

来源：

EUROPEAN PHYSICAL JOURNAL C | 2018年 / 78卷 / 05期

关键词：

PAIR PRODUCTION; LHC;

D O I：

10.1140/epjc/s10052-018-5687-2

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

A generic expression to compute triple-parton scattering (TPS) cross sections in high-energy proton-nucleus (pA) collisions is derived as a function of the corresponding single-parton cross sections and an effective parameter encoding the transverse parton profile of the proton. The TPS cross sections are enhanced by a factor of about 9 A similar or equal to 2000 in pPb as compared to those in proton-nucleon collisions at the same center-of-mass energy. Estimates for triple charm (c(c)over-bar) and bottom (b(b)over-bar) production in pPb collisions at LHC and FCC energies are presented based on next-to-next-to-leading-order calculations for c(c)over-bar and b(b)over-bar single-parton cross sections. At root s(NN) = 8.8 TeV, about 10% of the pPb events have three a pairs produced in separate partonic interactions. At root s(NN) = 63 TeV, the pPb cross sections for triple-J/psi and triple-b(b)over-bar are O(1-10 mb). In the most energetic collisions of cosmic rays in the upper atmosphere, equivalent to root s(NN approximate to) 400 TeV, the TPS c(c)over-bar cross section equals the total p-Air inelastic cross section.

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