Study of dijet events with a large rapidity gap between the two leading jets in pp collisions at $\sqrt{s}=7$ $\,\text {TeV}$
(2018) European Physical Journal C. Particles and Fields — Vol. C78, p. 242 (2018)
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- Events with no charged particles produced between the two leading jets are studied in proton-proton collisions at $\sqrt{s}$ = 7 TeV. The jets were required to have transverse momentum $p_\mathrm{T}^{\text{jet}}$ > 40 GeV and pseudorapidity 1.5 $<|\eta^{\text{jet}}| <$ 4.7, and to have values of $\eta^{\text{jet}}$ 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 $p_\mathrm{T}$ > 0.2 GeV in the interval -1 < $\eta$ < 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 $p_\mathrm{T}$ 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.
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Bakhshiansohi, H., Bondu, O., Brochet, S., Bruno, G., Caudron, A., De Visscher, S., Delaere, C., Delcourt, M., François, B., Giammanco, A., Jafari, A., Komm, M., Krintiras, G., Lemaitre, V., Magitteri, A., Mertens, A., Musich, M., Piotrzkowski, K., Quertenmont, L., et al. (2018). Study of dijet events with a large rapidity gap between the two leading jets in pp collisions at $\sqrt{s}=7$ $\,\text {TeV}$. European Physical Journal C. Particles and Fields, C78, 242. https://doi.org/10.1140/epjc/s10052-018-5691-6 (Original work published 2018)