Inclusive search for a highly boosted higgs boson decaying to a bottom quark-antiquark pair

• Main Authors: Sirunyan, A. M., Tumasyan, A. R., Adam, Wolfgang, Ambrogi, Federico, Asilar, Ece, Md. Ali, Mohd. Adli
• Format: Article
• Language: English; English; English
• Published: American Physical Society 2018
• Subjects: Q Science (General); QC Physics; QK Botany
• Online Access: http://irep.iium.edu.my/64700/1/64700_Inclusive%20Search%20for%20a%20Highly%20Boosted%20Higgs%20Boson_article.pdf; http://irep.iium.edu.my/64700/2/64700_Inclusive%20Search%20for%20a%20Highly%20Boosted%20Higgs%20Boson_scopus.pdf; http://irep.iium.edu.my/64700/13/64700_Inclusive%20Search%20for%20a%20Highly%20Boosted%20Higgs%20Boson_WoS.pdf; http://irep.iium.edu.my/64700/; https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.120.071802

An inclusive search for the standard model Higgs boson (H) produced with large transverse momentum (pT) and decaying to a bottom quark-antiquark pair (bb) is performed using a data set of pp collisions at s=13 TeV collected with the CMS experiment at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb-1. A highly Lorentz-boosted Higgs boson decaying to bb is reconstructed as a single, large radius jet, and it is identified using jet substructure and dedicated b tagging techniques. The method is validated with Z→bb decays. The Z→bb process is observed for the first time in the single-jet topology with a local significance of 5.1 standard deviations (5.8 expected). For a Higgs boson mass of 125 GeV, an excess of events above the expected background is observed (expected) with a local significance of 1.5 (0.7) standard deviations. The measured cross section times branching fraction for production via gluon fusion of H→bb with reconstructed pT>450 GeV and in the pseudorapidity range -2.5<η<2.5 is 74±48(stat)-10+17(syst) fb, which is consistent within uncertainties with the standard model prediction.