A search for the standard model Higgs boson decaying to a charm quark-antiquark pair, H -> ccbar, produced in association with a leptonically decaying V (W or Z) boson is presented. The search is performed with proton-proton collisions at sqrt(s) = 13 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb-1. Novel charm jet identification and analysis methods using machine learning techniques are employed. The analysis is validated by searching for Z -> ccbar in VZ events, leading to its first observation at a hadron collider with a significance of 5.7 standard deviations. The observed (expected) upper limit on sigma(VH)B(H -> ccbar) is 0.94 (0.50(-0.15)(+0.22) )pb at 95% confidence level (C.L.), corresponding to 14 (7.6(-2.3)(+3.4)) times the standard model prediction. For the Higgs-charm Yukawa coupling modifier, Kc, the observed (expected) 95% C.L. interval is 1.1 < |Kc| < 5.5 (|Kc| < 3.4), the most stringent constraint to date.
Search for Higgs Boson Decay to a Charm Quark-Antiquark Pair in Proton-Proton Collisions at sqrt(s) = 13 TeV
Cappati, A.;Meridiani, P.;Amapane, N.;Argiro', S.;Bellan, R.;Bellora, A.;Costa, M.;Covarelli, R.;Grippo, M.;Kiani, B.;Migliore, E.;Monteil, E.;Obertino, M. M.;Pacher, L.;Shchelina, K.;Siviero, F.;Sola, V.;Solano, A.;Soldi, D.;Tornago, M.;Vagnerini, A.;Rumerio, P.;Ravera, F.;Salvatico, R.;
2023-01-01
Abstract
A search for the standard model Higgs boson decaying to a charm quark-antiquark pair, H -> ccbar, produced in association with a leptonically decaying V (W or Z) boson is presented. The search is performed with proton-proton collisions at sqrt(s) = 13 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb-1. Novel charm jet identification and analysis methods using machine learning techniques are employed. The analysis is validated by searching for Z -> ccbar in VZ events, leading to its first observation at a hadron collider with a significance of 5.7 standard deviations. The observed (expected) upper limit on sigma(VH)B(H -> ccbar) is 0.94 (0.50(-0.15)(+0.22) )pb at 95% confidence level (C.L.), corresponding to 14 (7.6(-2.3)(+3.4)) times the standard model prediction. For the Higgs-charm Yukawa coupling modifier, Kc, the observed (expected) 95% C.L. interval is 1.1 < |Kc| < 5.5 (|Kc| < 3.4), the most stringent constraint to date.File | Dimensione | Formato | |
---|---|---|---|
1.PhysRevLett.131.061801_printed.pdf
Accesso aperto
Tipo di file:
PDF EDITORIALE
Dimensione
1.19 MB
Formato
Adobe PDF
|
1.19 MB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.