A measurement is presented of the cross section in proton-proton collisions for the production of two 𝑊 bosons and one 𝑍 boson. It is based on data recorded by the CMS experiment at the CERN LHC at center-of-mass energies √𝑠 =13 and 13.6 TeV, corresponding to an integrated luminosity of 200 fb−1. Events with four charged leptons (electrons or muons) in the final state are selected. Both nonresonant 𝑊𝑊𝑍 production and 𝑍𝐻production, with the Higgs boson decaying into two 𝑊 bosons, are reported. For the first time, the two processes are measured separately in a simultaneous fit. Combining the two modes, signal strengths relative to the standard model (SM) predictions of 0.75^{+0.34}_{−0.29} and 1.74^{+0.71}_{−0.60} are measured for √𝑠 =13 and 13.6 TeV, respectively. The observed (expected) significance for the triboson signal is 3.8 (2.5) standard deviations for √𝑠=13.6 TeV, thus providing the first evidence for triboson production at this center-of-mass energy. Combining the two modes and the two center-of-mass energies, the inclusive signal strength relative to the SM prediction is measured to be 1.03^{+0.31}_{−0.28}, with an observed (expected) significance of 4.5 (5.0) standard deviations.
Measurement of 𝑊𝑊𝑍 and 𝑍𝐻 Production Cross Sections at √𝑠 =13 and 13.6 TeV
Abbrescia, M.;Barbieri, M.;Buonsante, M.;Colaleo, A.;D'Anzi, B.;Elmetenawee, W.;Louka, M.;Margjeka, I.;Mastrapasqua, V.;My, S.;Nenna, F.;Nuzzo, S.;Pellecchia, A.;Pompili, A.;Pugliese, G.;Radogna, R.;Simone, F. M.;Stamerra, A.;Troiano, D.;Venditti, R.;Verwilligen, P.;Zaza, A.;
2025-01-01
Abstract
A measurement is presented of the cross section in proton-proton collisions for the production of two 𝑊 bosons and one 𝑍 boson. It is based on data recorded by the CMS experiment at the CERN LHC at center-of-mass energies √𝑠 =13 and 13.6 TeV, corresponding to an integrated luminosity of 200 fb−1. Events with four charged leptons (electrons or muons) in the final state are selected. Both nonresonant 𝑊𝑊𝑍 production and 𝑍𝐻production, with the Higgs boson decaying into two 𝑊 bosons, are reported. For the first time, the two processes are measured separately in a simultaneous fit. Combining the two modes, signal strengths relative to the standard model (SM) predictions of 0.75^{+0.34}_{−0.29} and 1.74^{+0.71}_{−0.60} are measured for √𝑠 =13 and 13.6 TeV, respectively. The observed (expected) significance for the triboson signal is 3.8 (2.5) standard deviations for √𝑠=13.6 TeV, thus providing the first evidence for triboson production at this center-of-mass energy. Combining the two modes and the two center-of-mass energies, the inclusive signal strength relative to the SM prediction is measured to be 1.03^{+0.31}_{−0.28}, with an observed (expected) significance of 4.5 (5.0) standard deviations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


