This Letter presents a search for the Standard Model Higgs boson in the decay channel H -> ZZ((*)) -> l(+)l(-)l(-)+l(')-, where l,l' = e or mu, using proton-proton collisions at root s = 7 TeV recorded with the ATLAS detector and corresponding to an integrated luminosity of 4.8 fb(-1). The four-lepton invariant mass distribution is compared with Standard Model background expectations to derive upper limits on the cross section of a Standard Model Higgs boson with a mass between 110 GeV and 600 GeV. The mass ranges 134-156 GeV, 182-233 GeV, 256-265 GeV and 268-415 GeV are excluded at the 95% confidence level. The largest upward deviations from the background-only hypothesis are observed for Higgs boson masses of 125 GeV, 244 GeV and 500 GeV with local significances of 2.1, 2.2 and 2.1 standard deviations, respectively. Once the look-elsewhere effect is considered, none of these excesses are significant. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.

Search for the Standard Model Higgs boson in the decay channel H -> ZZ((*)) -> 4l with 4.8 fb(-1) of pp collision data at root s=7 TeV with ATLAS / Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdelalim, A.A., Abdesselam, A., Abdinov, O., Abi, B., Abolins, M., Abouzeid, O.S., Abramowicz, H., Abreu, H., Acerbi, E., Acharya, B.S., Adamczyk, L., Adams, D.L., Addy, T.N., Adelman, J., Aderholz, M., Adomeit, S., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 710:(2012), pp. 383-402. [10.1016/j.physletb.2012.03.005]

Search for the Standard Model Higgs boson in the decay channel H -> ZZ((*)) -> 4l with 4.8 fb(-1) of pp collision data at root s=7 TeV with ATLAS

G. Artoni;BAGNAIA, Paolo;BINI, Cesare;DE CECCO, Sandro;DIONISI, Carlo;GAUZZI, Paolo;GENTILE, Simonetta;GIAGU, Stefano;M. Kado;LACAVA, Francesco;LUCI, Claudio;MESSINA, Andrea;MONZANI, SIMONE;A. Policicchio;SOLFAROLI CAMILLOCCI, ELENA;VANADIA, MARCO;VERDUCCI, MONICA;
2012

Abstract

This Letter presents a search for the Standard Model Higgs boson in the decay channel H -> ZZ((*)) -> l(+)l(-)l(-)+l(')-, where l,l' = e or mu, using proton-proton collisions at root s = 7 TeV recorded with the ATLAS detector and corresponding to an integrated luminosity of 4.8 fb(-1). The four-lepton invariant mass distribution is compared with Standard Model background expectations to derive upper limits on the cross section of a Standard Model Higgs boson with a mass between 110 GeV and 600 GeV. The mass ranges 134-156 GeV, 182-233 GeV, 256-265 GeV and 268-415 GeV are excluded at the 95% confidence level. The largest upward deviations from the background-only hypothesis are observed for Higgs boson masses of 125 GeV, 244 GeV and 500 GeV with local significances of 2.1, 2.2 and 2.1 standard deviations, respectively. Once the look-elsewhere effect is considered, none of these excesses are significant. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.
2012
01 Pubblicazione su rivista::01a Articolo in rivista
Search for the Standard Model Higgs boson in the decay channel H -> ZZ((*)) -> 4l with 4.8 fb(-1) of pp collision data at root s=7 TeV with ATLAS / Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdelalim, A.A., Abdesselam, A., Abdinov, O., Abi, B., Abolins, M., Abouzeid, O.S., Abramowicz, H., Abreu, H., Acerbi, E., Acharya, B.S., Adamczyk, L., Adams, D.L., Addy, T.N., Adelman, J., Aderholz, M., Adomeit, S., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 710:(2012), pp. 383-402. [10.1016/j.physletb.2012.03.005]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/449365
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