Exploring small-angle emissions in charm quark jets in proton-proton collisions at $\sqrt{s}$ = 5.02 TeV

Abstract

A measurement of the angular structure of inclusive jets and those containing a prompt D${}^0$ meson in proton-proton collisions at the LHC at a center-of-mass energy of 5.02 TeV is presented. The data corresponding to an integrated luminosity of 301 pb${}^{-1}$ were collected by the CMS experiment in 2017. Two jet grooming algorithms, late-$k_{\mathrm{T}}$ and soft drop, are used to study the intrajet radiation pattern using iterative Cambridge$-$Aachen declustering. The splitting-angle distributions of jets with transverse momentum ($p_{\mathrm{T}}$) of around 100 GeV, obtained with these two algorithms, show that there is a shift of the distribution for jets containing a prompt D${}^0$ meson with respect to inclusive jets. The suppression of emissions at small angles observed in the late-$k_{\mathrm{T}}$ grooming approach is consistent with the dead-cone effect, whereas the similar suppression for splittings selected with the soft-drop algorithm appears to be induced by gluon splitting to charm quark-antiquark pairs at large angles. The measured distributions are corrected to the particle level and can be used to constrain model predictions for the substructure of high-$p_{\mathrm{T}}$ charm quark jets.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-24-007 (CMS Public Pages)