A search for the standard model Higgs boson decaying to a charm quark-antiquark pair, 𝐻→𝑐 ¯ 𝑐 , produced in association with a top quark-antiquark pair (𝑡 ¯ 𝑡 𝐻 ) is presented. The search is performed with data from proton-proton collisions at √𝑠 =13 TeV , corresponding to an integrated luminosity of 138 fb−1 . Advanced machine learning techniques are employed for jet flavor identification and event classification. The Higgs boson decay to a bottom quark-antiquark pair is measured simultaneously and the observed 𝑡 ¯ 𝑡 𝐻(𝐻→𝑏 ¯ 𝑏 ) event rate relative to the standard model expectation is 0.91+0.26 −0.22 . The observed (expected) upper limit on the product of production cross section and branching fraction 𝜎(𝑡 ¯ 𝑡 𝐻)ℬ(𝐻→𝑐 ¯ 𝑐 ) is 0.11 (0.13) pb at 95% confidence level, corresponding to 7.8 (8.7) times the standard model prediction. When combined with the previous search for 𝐻 →𝑐 ¯ 𝑐 via associated production with a 𝑊 or 𝑍 boson, the observed (expected) 95% confidence interval on the Higgs-charm Yukawa coupling modifier, 𝜅𝑐 , is |𝜅𝑐| <3.5 (2.7), the most stringent constraint to date.
Simultaneous Probe of the Charm and Bottom Quark Yukawa Couplings Using (Formula presented) Events
Abbrescia, M.;Buonsante, M.;Colaleo, A.;De Palma, M.;Elmetenawee, W.;Louka, M.;My, S.;Nenna, F.;Pellecchia, A.;Pompili, A.;Radogna, R.;Simone, F. M.;Stamerra, A.;Troiano, D.;Venditti, R.;Zaza, A.;
2026-01-01
Abstract
A search for the standard model Higgs boson decaying to a charm quark-antiquark pair, 𝐻→𝑐 ¯ 𝑐 , produced in association with a top quark-antiquark pair (𝑡 ¯ 𝑡 𝐻 ) is presented. The search is performed with data from proton-proton collisions at √𝑠 =13 TeV , corresponding to an integrated luminosity of 138 fb−1 . Advanced machine learning techniques are employed for jet flavor identification and event classification. The Higgs boson decay to a bottom quark-antiquark pair is measured simultaneously and the observed 𝑡 ¯ 𝑡 𝐻(𝐻→𝑏 ¯ 𝑏 ) event rate relative to the standard model expectation is 0.91+0.26 −0.22 . The observed (expected) upper limit on the product of production cross section and branching fraction 𝜎(𝑡 ¯ 𝑡 𝐻)ℬ(𝐻→𝑐 ¯ 𝑐 ) is 0.11 (0.13) pb at 95% confidence level, corresponding to 7.8 (8.7) times the standard model prediction. When combined with the previous search for 𝐻 →𝑐 ¯ 𝑐 via associated production with a 𝑊 or 𝑍 boson, the observed (expected) 95% confidence interval on the Higgs-charm Yukawa coupling modifier, 𝜅𝑐 , is |𝜅𝑐| <3.5 (2.7), the most stringent constraint to date.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


