A measurement of the fiducial cross section of the associated production of a Z boson and a high-pT photon, where the Z decays to two neutrinos, and a search for anomalous triple gauge couplings are reported. The results are based on data collected by the CMS experiment at the LHC in proton-proton collisions at sqrt(s) = 13 TeV during 2016-2018, corresponding to an integrated luminosity of 138 fb^-1. The fiducial Z-gamma cross section, where a photon with a pT greater than 225 GeV is produced in association with a Z, and the Z decays to a neutrino-antineutrino pair, Z(nu nu)gamma, is measured to be 23.3 (+1.4, -1.3) fb, in agreement, within uncertainties, with the standard model prediction. The differential cross section as a function of the photon pT has been measured and compared with standard model predictions computed at next-to-leading and at next-to-next-to-leading order in perturbative quantum chromodynamics. Constraints have been placed on the presence of anomalous couplings that affect the ZZgamma and Zgamma-gamma vertex using the pT spectrum of the photons. The observed 95% confidence level intervals for CP-conserving h3(gamma) and h4(gamma) are determined to be (-3.4, 3.5)x10^-4 and (-6.8, 6.8)x10^-7, and for h3(Z) and h4(Z) they are (-2.2, 2.2)x10^-4 and (-4.1, 4.2)x10^-7, respectively. These are the strictest limits to date on h3(gamma), h3(Z) and h4(Z).

Measurement of the Zγ production cross section and search for anomalous neutral triple gauge couplings in pp collisions at √s = 13TeV / Null, N., Null, N., Hayrapetyan, A., Hayrapetyan, A., Tumasyan, A., Tumasyan, A., Adam, W., Adam, W., Andrejkovic, J.W., Andrejkovic, J.W., Bergauer, T., Bergauer, T., Chatterjee, S., Chatterjee, S., Damanakis, K., Damanakis, K., Dragicevic, M., Dragicevic, M., Hussain, P.S., Hussain, P.S., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2026:8(2026 Aug), pp. 1-40. [10.1007/jhep08(2026)049]

Measurement of the Zγ production cross section and search for anomalous neutral triple gauge couplings in pp collisions at √s = 13TeV

Cunqueiro Mendez, L.;Cunqueiro Mendez, L.;Del Re, D.;Del Re, D.;Organtini, G.;Organtini, G.;Paramatti, R.;Paramatti, R.;Rahatlou, S.;Rahatlou, S.;Santanastasio, F.;Santanastasio, F.;
2026

Abstract

A measurement of the fiducial cross section of the associated production of a Z boson and a high-pT photon, where the Z decays to two neutrinos, and a search for anomalous triple gauge couplings are reported. The results are based on data collected by the CMS experiment at the LHC in proton-proton collisions at sqrt(s) = 13 TeV during 2016-2018, corresponding to an integrated luminosity of 138 fb^-1. The fiducial Z-gamma cross section, where a photon with a pT greater than 225 GeV is produced in association with a Z, and the Z decays to a neutrino-antineutrino pair, Z(nu nu)gamma, is measured to be 23.3 (+1.4, -1.3) fb, in agreement, within uncertainties, with the standard model prediction. The differential cross section as a function of the photon pT has been measured and compared with standard model predictions computed at next-to-leading and at next-to-next-to-leading order in perturbative quantum chromodynamics. Constraints have been placed on the presence of anomalous couplings that affect the ZZgamma and Zgamma-gamma vertex using the pT spectrum of the photons. The observed 95% confidence level intervals for CP-conserving h3(gamma) and h4(gamma) are determined to be (-3.4, 3.5)x10^-4 and (-6.8, 6.8)x10^-7, and for h3(Z) and h4(Z) they are (-2.2, 2.2)x10^-4 and (-4.1, 4.2)x10^-7, respectively. These are the strictest limits to date on h3(gamma), h3(Z) and h4(Z).
2026-08
beyond standard model; Hadron-Hadron scattering; particle and resonance production; photon production
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Measurement of the Zγ production cross section and search for anomalous neutral triple gauge couplings in pp collisions at √s = 13TeV / Null, N., Null, N., Hayrapetyan, A., Hayrapetyan, A., Tumasyan, A., Tumasyan, A., Adam, W., Adam, W., Andrejkovic, J.W., Andrejkovic, J.W., Bergauer, T., Bergauer, T., Chatterjee, S., Chatterjee, S., Damanakis, K., Damanakis, K., Dragicevic, M., Dragicevic, M., Hussain, P.S., Hussain, P.S., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2026:8(2026 Aug), pp. 1-40. [10.1007/jhep08(2026)049]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1779586
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