Same-sign WW production in proton-nucleus collisions at the LHC as a signal for double parton scattering

被引：40
|
作者：
d'Enterria, David [1 ]
Snigirev, Alexander M. [2 ]
机构：
[1] CERN, PH Dept, CH-1211 Geneva, Switzerland
[2] Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119991, Russia
来源：
PHYSICS LETTERS B | 2013年 / 718卷 / 4-5期
基金：
俄罗斯基础研究基金会;
关键词：
PP COLLISIONS; (P)OVER-BAR-P COLLISIONS; MULTIPARTON INTERACTIONS; BOSON PRODUCTION; EVENTS; SEARCH; PROBE;
D O I：
10.1016/j.physletb.2012.12.032
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The production of same-sign W-boson pairs from double parton scatterings (DPS) in proton-lead (p-Pb) collisions at the CERN Large Hadron Collider is studied. The signal and background cross sections are estimated with next-to-leading-order perturbative QCD calculations using nuclear parton distribution functions for the Pb ion. At root S-NN = 8.8 TeV the cross section for the DPS process is about 150 pb, i.e. 600 times larger than that in proton-proton collisions at the same centre-of-mass energy and 1.5 times higher than the p-Pb -> (WW +/-)-W-+/- + 2-jets single-parton background. The measurement of such a process, where 10 events with fully leptonic W's decays are expected after cuts in 2 pb(-1), would constitute an unambiguous DPS signal and would help determine the effective sigma(eff) parameter characterising the transverse distribution of partons in the proton. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：1395 / 1400
页数：6
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