Measurements of the differential jet cross section as a function of the jet mass in dijet events from proton-proton collisions at √s=13 TeV

Sirunyan, A.M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Asilar, E. and Bartók, Márton and Csanád, Máté and Filipovic, Nicolas and Major, Péter and Nagy, Márton and Pásztor, Gabriella and Surányi, Olivér and Veres, Gábor and Siklér, Ferenc and Béni, Noémi Tekla and Czellár, Sándor and Karancsi, János and Makovec, Alajos and Molnár, József and Szillási, Zoltán and Ujvári, Balázs (2018) Measurements of the differential jet cross section as a function of the jet mass in dijet events from proton-proton collisions at √s=13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2018 (11). ISSN 1126-6708

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Abstract

Measurements of the differential jet cross section are presented as a function of jet mass in dijet events, in bins of jet transverse momentum, with and without a jet grooming algorithm. The data have been recorded by the CMS Collaboration in proton-proton collisions at the LHC at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 2.3 fb$^{-1}$. The absolute cross sections show slightly different jet transverse momentum spectra in data and Monte Carlo event generators for the settings used. Removing this transverse momentum dependence, the normalized cross section for ungroomed jets is consistent with the prediction from Monte Carlo event generators for masses below 30% of the transverse momentum. The normalized cross section for groomed jets is measured with higher precision than the ungroomed cross section. Semi-analytical calculations of the jet mass beyond leading logarithmic accuracy are compared to data, as well as predictions at leading order and next-to-leading order, which include parton showering and hadronization. Overall, in the normalized cross section, the theoretical predictions agree with the measured cross sections within the uncertainties for masses from 10 to 30% of the jet transverse momentum.

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