Direct measurement of the mass difference between top and antitop quarks

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Data

2011-09-14

Autores

Abazov, V. M.
Abbott, B.
Acharya, B. S.
Adams, M.
Adams, T.
Alexeev, G. D.
Alkhazov, G.
Alton, A.
Alverson, G.
Alves, G. A.

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Amer Physical Soc

Resumo

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.

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Physical Review D. College Pk: Amer Physical Soc, v. 84, n. 5, p. 18, 2011.