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Observation of H→bb¯ decays and VH production with the ATLAS detector

Physics letters. B, 2018-11, Vol.786, p.59-86 [Peer Reviewed Journal]

2018 The Author(s) ;ISSN: 0370-2693 ;ISSN: 1873-2445 ;EISSN: 1873-2445 ;DOI: 10.1016/j.physletb.2018.09.013

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Title:
Observation of H→bb¯ decays and VH production with the ATLAS detector
Author: Alberghi, G.L. ; Alconada Verzini, M.J. ; Alderweireldt, S. ; Alexopoulos, T. ; Aperio Bella, L. ; Bandyopadhyay, A. ; Beddall, A.J. ; Bedognetti, M. ; Bentvelsen, S. ; Beringer, J. ; Biebel, O. ; Biesuz, N.V. ; Bisanz, T. ; Borissov, G. ; Brock, R. ; Camarero Munoz, D. ; Campanelli, M. ; Carbone, R.M. ; Chapman, J.D. ; Clark, M.R. ; Da Via, C. ; Darmora, S. ; Del Peso, J. ; Dova, M.T. ; Ellis, N. ; Gasnikova, K. ; Ghasemi, S. ; Giromini, P. ; Gravili, F.G. ; Grimm, K. ; Guest, D. ; Gutierrez, P. ; Haddad, N. ; Hansen, J.D. ; Haywood, S.J. ; Held, A. ; Hill, J.C. ; Hill, K.K. ; Iizawa, T. ; Kempster, J.J. ; Khubua, J. ; Lanni, F. ; Lanza, A. ; Lau, T.S. ; Lellouch, D. ; Li, L. ; Litke, A.M. ; Lösle, A. ; Marzin, A. ; Mastrandrea, P. ; McCarthy, T.G. ; Merola, L. ; Merritt, F.S. ; Metcalfe, J. ; Miyagawa, P.S. ; Navarro, G. ; Neal, H.A. ; Nechaeva, P.Y. ; Nikiforou, N. ; Nomachi, M. ; Otero y Garzon, G. ; Pater, J.R. ; Pedersen, M. ; Peleganchuk, S.V. ; Perepelitsa, D.V. ; Perrella, S. ; Phillips, P.W. ; Podberezko, P. ; Powell, T.D. ; Ravinovich, I. ; Read, A.L. ; Reichert, J. ; Rijssenbeek, M. ; Ristić, B. ; Romano, M. ; Salazar Loyola, J.E. ; Sandaker, H. ; Sbarra, C. ; Schott, M. ; Seidel, S.C. ; Shi, L. ; Stegler, M. ; Strom, D.M. ; Sulin, V.V. ; Tahirovic, E. ; Tian, Y. ; Tikhonov, Yu.A. ; Todome, K. ; Tompkins, L. ; Tuts, P.M. ; Vadla, K.O.H. ; Villa, M. ; Watson, M.F. ; Wolters, H. ; Wyatt, T.R. ; Xu, L. ; Yuen, S.P.Y. ; Zeißner, S.V. ; Zhang, G. ; Zhou, Y.
Subjects: Fysik ; Natural Sciences ; Naturvetenskap ; Physical Sciences ; Subatomic Physics ; Subatomär fysik
Is Part Of: Physics letters. B, 2018-11, Vol.786, p.59-86
Description: A search for the decay of the Standard Model Higgs boson into a bb¯ pair when produced in association with a W or Z boson is performed with the ATLAS detector. The data, corresponding to an integrated luminosity of 79.8fb−1 were collected in proton–proton collisions during Run 2 of the Large Hadron Collider at a centre-of-mass energy of 13TeV. For a Higgs boson mass of 125GeV, an excess of events over the expected background from other Standard Model processes is found with an observed (expected) significance of 4.9 (4.3) standard deviations. A combination with the results from other searches in Run 1 and in Run 2 for the Higgs boson in the bb¯ decay mode is performed, which yields an observed (expected) significance of 5.4 (5.5) standard deviations, thus providing direct observation of the Higgs boson decay into b-quarks. The ratio of the measured event yield for a Higgs boson decaying into bb¯ to the Standard Model expectation is 1.01±0.12(stat.)−0.15+0.16(syst.). Additionally, a combination of Run 2 results searching for the Higgs boson produced in association with a vector boson yields an observed (expected) significance of 5.3 (4.8) standard deviations.
Publisher: Elsevier B.V
Language: English
Identifier: ISSN: 0370-2693
ISSN: 1873-2445
EISSN: 1873-2445
DOI: 10.1016/j.physletb.2018.09.013
Source: SWEPUB Freely available online
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Observation of H→bb¯ decays and VH production with the ATLAS detector

2018 The Author(s) ;ISSN: 0370-2693 ;ISSN: 1873-2445 ;EISSN: 1873-2445 ;DOI: 10.1016/j.physletb.2018.09.013

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