Direct measurement of the mass difference between top and antitop quarks

0367738 - FZÚ 2013 RIV US eng J - Článek v odborném periodiku
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš … celkem 420 autorů
Direct measurement of the mass difference between top and antitop quarks.
Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 84, č. 5 (2011), "052005-1"-"052005-17". ISSN 1550-7998
Grant CEP: GA MŠMT LA08047
Výzkumný záměr: CEZ:AV0Z10100502
Klíčová slova: D0 * Tevatron * anti-top
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 4.558, rok: 2011

We present a direct measurement of the mass difference between top and antitop quarks (Delta m) in lepton + jets t (t) over bar final states using the "matrix element" method. The purity of the lepton + jets sample is enhanced for t (t) over bar events by identifying at least one of the jets as originating from a b quark. The analyzed data correspond to 3.6 fb(-1) of p (p) over bar collisions at root s = 1.96 TeV acquired by D0 in Run II of the Fermilab Tevatron Collider. The combination of the e + jets and mu + jets channels yields Delta m = 0.8 +/- 1.8(stat) +/- 0.5(syst) GeV, which is in agreement with the standard model expectation of no mass difference.
Trvalý link: http://hdl.handle.net/11104/0202303