Measurement of the forward-backward asymmetry in the distribution of leptons in tt¯ events in the lepton+jets channel

0435513 - FZÚ 2015 RIV US eng J - Článek v odborném periodiku
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš … celkem 363 autorů
Measurement of the forward-backward asymmetry in the distribution of leptons in tt¯ events in the lepton+jets channel.
Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 90, č. 7 (2014), "072001-1"-"072001-17". ISSN 1550-7998
Grant CEP: GA MŠMT(CZ) LG12006
Institucionální podpora: RVO:68378271
Klíčová slova: Batavia TEVATRON Coll * transverse momentum dependence * experimental results * rapidity dependence * DZERO * 1960 GeV-cms
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 4.643, rok: 2014

We present measurements of the forward-backward asymmetry in the angular distribution of leptons from decays of top quarks and antiquarks produced in proton-antiproton collisions. We consider the final state containing a lepton and at least three jets. The entire sample of data collected by the D0 experiment during Run II of the Fermilab Tevatron Collider, corresponding to 9.7 inverse fb of integrated luminosity, is used. The asymmetry measured for reconstructed leptons is AlFB=(2.9±2.1(stat.)+1.5−1.7(syst.))%. When corrected for efficiency and resolution effects within the lepton rapidity coverage of |yl|<1.5, the asymmetry is found to be AlFB=(4.2±2.3(stat.)+1.7−2.0(syst.))%. Combination with the asymmetry measured in the dilepton final state yields AlFB=(4.2±2.0(stat.)±1.4(syst.))%. We examine the dependence of AlFB on the transverse momentum and rapidity of the lepton.
Trvalý link: http://hdl.handle.net/11104/0239353