Measurements of charge and CP asymmetries in b -hadron decays using top-quark events collected by the ATLAS detector in pp collisions at s√=8 TeV

H. WAHLBERG Y ATLAS COLLABORATION

JOURNAL OF HIGH ENERGY PHYSICS - (Online)

SISSA

Año: 2017

1029-8479

Same- and opposite-sign charge asymmetries are measured in lepton+jets t t  ̄ events in whicha b-hadron decays semileptonically to a soft muon, using data corresponding to an integrated√luminosity of 20.3 fb −1 from proton?proton collisions at a centre-of-mass energy of s =8 TeV collected with the ATLAS detector at the Large Hadron Collider at CERN. The chargeasymmetries are based on the charge of the lepton from the top-quark decay and the chargeof the soft muon from the semileptonic decay of a b-hadron and are measured in a fiducialregion corresponding to the experimental acceptance. Four CP asymmetries (one mixing andthree direct) are measured and are found to be compatible with zero and consistent with theStandard Model.