A measurement is presented of dijet angular distributions in proton-proton collisions at s = 13TeV, using data collected with the CMS detector at the CERN LHC and corresponding to an integrated luminosity of 138 fb−1. For the first time, the dijet angular distributions, corrected for detector effects, are compared with the predictions of perturbative quantum chromodynamics at next-to-next-to-leading order, including next-to-leading-order electroweak corrections. While data are generally found to be in agreement with predictions, a small difference in shape of the normalized distributions is seen for dijet masses ranging from 2.4 to 4.8 TeV and above 6 TeV. The distributions are used to search for proposed signatures of quark compositeness, extra spatial dimensions, quantum black holes, dark-matter mediators, axion-like particles, and anomalous gluon couplings. The most stringent limits to date are set for most of these scenarios. Quark contact interactions are excluded at 95% confidence level (CL) up to a scale of 17 (37) TeV for destructive (constructive) interference in a benchmark scenario, valid to next-to-leading order in quantum chromodynamics, and in which only left-handed quarks participate. The coupling of axion-like particles to the gluon, cg/fa, is constrained to be lower than 0.42 TeV−1 at 95% CL. The anomalous triple-gluon coupling, CG/Λ2, in a standard model effective field theory is constrained to be lower than 0.0076 TeV−2 at 95% CL.

Measurement of dijet angular distributions and search for beyond the standard model physics in proton-proton collisions at s = 13TeV

Abbrescia, M.;Barbieri, M.;Buonsante, M.;Colaleo, A.;De Palma, M.;Elmetenawee, W.;Generoso, L.;Louka, M.;Mastrapasqua, V.;My, S.;Nenna, F.;Nuzzo, S.;Pellecchia, A.;Pompili, A.;Radogna, R.;Stamerra, A.;Troiano, D.;Venditti, R.;Zaza, A.;D'Anzi, B.;
2026-01-01

Abstract

A measurement is presented of dijet angular distributions in proton-proton collisions at s = 13TeV, using data collected with the CMS detector at the CERN LHC and corresponding to an integrated luminosity of 138 fb−1. For the first time, the dijet angular distributions, corrected for detector effects, are compared with the predictions of perturbative quantum chromodynamics at next-to-next-to-leading order, including next-to-leading-order electroweak corrections. While data are generally found to be in agreement with predictions, a small difference in shape of the normalized distributions is seen for dijet masses ranging from 2.4 to 4.8 TeV and above 6 TeV. The distributions are used to search for proposed signatures of quark compositeness, extra spatial dimensions, quantum black holes, dark-matter mediators, axion-like particles, and anomalous gluon couplings. The most stringent limits to date are set for most of these scenarios. Quark contact interactions are excluded at 95% confidence level (CL) up to a scale of 17 (37) TeV for destructive (constructive) interference in a benchmark scenario, valid to next-to-leading order in quantum chromodynamics, and in which only left-handed quarks participate. The coupling of axion-like particles to the gluon, cg/fa, is constrained to be lower than 0.42 TeV−1 at 95% CL. The anomalous triple-gluon coupling, CG/Λ2, in a standard model effective field theory is constrained to be lower than 0.0076 TeV−2 at 95% CL.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/601881
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