Precise Measurement of the Top Quark Mass in the Dilepton Channel at D0

Authors

V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
Kenneth A. Bloom, University of Nebraska-LincolnFollow
Daniel R. Claes, University of Nebraska-LincolnFollow
Kayle DeVaughan, University of Nebraska-Lincoln
Aaron Dominguez, University of Nebraska-LincolnFollow
Michael Eads, University of Nebraska-LincolnFollow
D. Johnston, University of Nebraska-LincolnFollow
Ioannis Katsanos, University of Nebraska-LincolnFollow
Sudhir Malik, University of Nebraska-LincolnFollow
Gregory Snow, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

2011

Citation

PHYSICAL REVIEW LETTERS 107, 082004 (2011); DOI: 10.1103/PhysRevLett.107.082004

Comments

Copyright 2011 American Physical Society

Abstract

We measure the top quark mass (m_t) in pp̅ collisions at a center of mass energy √s= 1.96 TeV using dilepton tt̅ →W⁺bW^-b̅→ℓ⁺v_ℓbℓ^-v̅_ℓb̅ events, where ℓ denotes an electron, a muon, or a tau that decays leptonically. The data correspond to an integrated luminosity of 5:4 fb1 collected with the D0 detector at the Fermilab Tevatron Collider. We obtain m_t= 174.0±1.8(stat) ± 2.4 (syst) GeV, which is in agreement with the current world average m_t = 173.3 ± 1.1 GeV. This is currently the most precise measurement of m_t in the dilepton channel.