Search for the Standard Model Higgs boson produced in association with top quarks and decaying into bb¯ in pp collisions at √s = 8 TeV with the ATLAS detector
Georges Aad,Brad Abbott,Jalal Abdallah,Ovsat Abdinov,Rosemarie Aben,M. Abolins,Ossama AbouZeid,Halina Abramowicz,Henso Abreu,Ricardo Abreu,Yiming Abulaiti,Bobby Samir Acharya,Leszek Adamczyk,David H. Adams,Jahred Adelman,Stefanie Adomeit,Tim Adye,A. A. Affolder,Tatjana Agatonovic-Jovin,J. A. Aguilar-Saavedra,M. Agustoni,S. P. Ahlen,Faig Ahmadov,Giulio Aielli,Henrik Akerstedt,T. P. A. Åkesson,G. Akimoto,A. V. Akimov,Gian Luigi Alberghi,J. Albert,S. Albrand,M. J. Alconada Verzini,Martin Aleksa,Igor Aleksandrov,Calin Alexa,Gideon Alexander,Theodoros Alexopoulos,Muhammad Alhroob,Gianluca Alimonti,Lion Alio,John Alison,Steven Patrick Alkire,Benedict Allbrooke,P. P. Allport,Alberto Aloisio,Alejandro Alonso,Francisco Alonso,Cristiano Alpigiani,A. Altheimer,B. Alvarez Gonzalez,D. Álvarez Piqueras,M. G. Alviggi,K. Amako,Y. Amaral Coutinho,Christoph Amelung,D. Amidei,S. P. Amor Dos Santos,António Amorim,Simone Amoroso,N. Amram,Glenn Amundsen,Christos Anastopoulos,Lucian Stefan Ancu,Nansi Andari,Timothy Andeen,Christoph Falk Anders,G. Anders,K. J. Anderson,A. Andreazza,V. Andrei,Stylianos Angelidakis,Ivan Angelozzi,Philipp Anger,Aaron Angerami,Francis Anghinolfi,Alexey Anisenkov,Nuno Anjos,Alberto Annovi,Massimo Antonelli,A. Antonov,J. Antos,F. Anulli,Masato Aoki,L. Aperio Bella,Giorgi Arabidze,Yoshio Arai,Juan Pedro Araque,A. T. H. Arce,Francisco Anuar Arduh,J-F. Arguin,S. Argyropoulos,Metin Arik,Aaron James Armbruster,Olivier Arnaez,V. Arnal,Hannah Arnold,Miguel Arratia,Ozan Arslan,A. Artamonov,Giacomo Artoni
European Physical Journal C（2015）
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摘要
A search for the Standard Model Higgs boson produced in association with a top-quark pair, , is presented. The analysis uses 20.3 fb(-1) of pp collision data at , collected with the ATLAS detector at the Large Hadron Collider during 2012. The search is designed for the decay mode and uses events containing one or two electrons or muons. In order to improve the sensitivity of the search, events are categorised according to their jet and b-tagged jet multiplicities. A neural network is used to discriminate between signal and background events, the latter being dominated by +jets production. In the single-lepton channel, variables calculated using a matrix element method are included as inputs to the neural network to improve discrimination of the irreducible background. No significant excess of events above the background expectation is found and an observed (expected) limit of 3.4 (2.2) times the Standard Model cross section is obtained at 95 % confidence level. The ratio of the measured signal cross section to the Standard Model expectation is found to be assuming a Higgs boson mass of 125 Gev.
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关键词
standard model higgs boson,top quarks,$$\varvec{pp}$$ collisions,atlas,standard model
