Search for higgs boson and observation of Z boson through their decay into a charm quark-antiquark pair in boosted topologies in proton-proton collisions at √s = 13 TeV

• Autor(a) principal: Tumasyan, Armen
• Data de Publicação: 2023
• Outros Autores: Silveira, Gustavo Gil da, CMS Collaboration
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/270763
• topic: Aceleradores de partículas; Colisões proton-proton; Bosons de higgs

A search for the standard model (SM) Higgs boson (H) produced with transverse momentum (pT) greater than 450 GeV and decaying to a charm quark-antiquark (cc¯) pair is presented. The search is performed using proton-proton collision data collected at ffiffi s p ¼ 13 TeV by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 fb−1. Boosted H → cc¯ decay products are reconstructed as a single large-radius jet and identified using a deep neural network charm tagging technique. The method is validated by measuring the Z → cc¯ decay process, which is observed in association with jets at high pT for the first time with a signal strength of 1.00þ0.17 −0.14 ðsystÞ 0.08ðtheoÞ 0.06ðstatÞ, defined as the ratio of the observed process rate to the SM expectation. The observed (expected) upper limit on σðHÞBðH → cc¯Þ is set at 47 (39) times the SM prediction at 95% confidence level