TY  - SER
AU  - Aad, G
AU  - Abdallah,J.
AU  - Chelkov,G.A.
AU  - Abbott,B.
ED  - Томский государственный университет
TI  - 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
KW  - ATLAS, детектор
KW  - Большой адронный коллайдер
KW  - кварки
KW  - столкновение частиц
KW  - статьи в журналах
N1  - Библиогр.: 116 назв
N2  - A search for the Standard Model Higgs boson produced in association with a top-quark pair, t ¯tH, is presented. The analysis uses 20.3 fb−1 of pp collision data at √s = 8 TeV, collected with the ATLAS detector at the Large Hadron Collider during 2012. The search is designed for the H b ¯b 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 t ¯t+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 t ¯t+b ¯b 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 t ¯tH signal cross section to the Standard Model expectation is found to be μ = 1.5±1.1 assuming a Higgs boson mass of 125 GeV
UR  - http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000525206
ER  -