Study of dijet events with a large rapidity gap between the two leading jets in pp collisions at sqrt(s) = 7 TeVстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:Events with no charged particles produced between the two leading jets are studied in proton-proton collisions at s√ = 7 TeV. The jets were required to have transverse momentum pjetT > 40 GeV and pseudorapidity 1.5 <|ηjet|< 4.7, and to have values of ηjet with opposite signs. The data used for this study were collected with the CMS detector during low-luminosity running at the LHC, and correspond to an integrated luminosity of 8 pb−1. Events with no charged particles with pT > 0.2 GeV in the interval -1 < η < 1 between the jets are observed in excess of calculations that assume no color-singlet exchange. The fraction of events with such a rapidity gap, amounting to 0.5-1% of the selected dijet sample, is measured as a function of the pT of the second-leading jet and of the rapidity separation between the jets. The data are compared to previous measurements at the Tevatron, and to perturbative quantum chromodynamics calculations based on the Balitsky-Fadin-Kuraev-Lipatov evolution equations, including different modelings of the non-perturbative gap survival probability.