First simultaneous measurement of the top quark mass in the lepton plus jets and dilepton channels at CDF

被引：25

作者：

不详

机构：

[1] Institute of Physics, Academia Sinica

[2] Argonne National Laboratory, Argonne

[3] University of Athens

[4] Institut de Fisica d'Altes Energies, Universitat Autonoma de Barcelona, E-08193, Bellaterra (Barcelona)

[5] Baylor University, Waco

[6] Istituto Nazionale di Fisica Nucleare Bologna

[7] University of Bologna

[8] Brandeis University, Waltham

[9] University of California, Davis, Davis

[10] University of California, Los Angeles, Los Angeles

[11] University of California, San Diego, San Diego

[12] University of California, Santa Barbara, Santa Barbara

[13] Instituto de Fisica de Cantabria, CSIC-University of Cantabria

[14] Carnegie Mellon University, Pittsburgh

[15] Enrico Fermi Institute, University of Chicago, Chicago

[16] Comenius University

[17] Joint Institute for Nuclear Research

[18] Duke University, Durham

[19] Fermi National Accelerator Laboratory, Batavia

[20] University of Florida, Gainesville

[21] Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare

[22] University of Geneva

[23] Glasgow University

[24] Harvard University, Cambridge

[25] Department of Physics, Helsinki Institute of Physics, University of Helsinki, FIN-00014, Helsinki

[26] University of Illinois, Urbana

[27] Johns Hopkins University, Baltimore

[28] Institut für Experimentelle Kernphysik, Universität Karlsruhe

[29] Center for High Energy Physics, Kyungpook National University

[30] Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley

[31] University of Liverpool

[32] University College London

[33] Centro de Investigaciones Energeticas Medioambientales y Tecnologicas

[34] Massachusetts Institute of Technology, Cambridge

[35] Institute of Particle Physics, McGill University, Montréal

[36] University of Michigan, Ann Arbor

[37] Michigan State University, East Lansing

[38] Institution for Theoretical and Experimental Physics, ITEP

[39] University of New Mexico, Albuquerque

[40] Northwestern University, Evanston

[41] Ohio State University, Columbus

[42] Okayama University

[43] Osaka City University

[44] University of Oxford

[45] Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento

[46] University of Padova

[47] LPNHE, Universite Pierre et Marie Curie/IN2P3-CNRS, UMR7585, Paris

[48] University of Pennsylvania, Philadelphia

[49] Istituto Nazionale di Fisica Nucleare Pisa

[50] University of Pisa

来源：

PHYSICAL REVIEW D | 2009年 / 79卷 / 09期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会; 芬兰科学院; 瑞士国家科学基金会; 俄罗斯基础研究基金会; 英国科学技术设施理事会;

关键词：

(P)OVER-BAR-P COLLISIONS; P(P)OVER-BAR COLLISIONS; COLLIDER DETECTOR;

D O I：

10.1103/PhysRevD.79.092005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a measurement of the mass of the top quark using data corresponding to an integrated luminosity of 1.9 fb(-1) of p (p) over bar collisions collected at root s = 1.96 TeV with the CDF II detector at Fermilab's Tevatron. This is the first measurement of the top quark mass using top-antitop pair candidate events in the lepton + jets and dilepton decay channels simultaneously. We reconstruct two observables in each channel and use a nonparametric kernel density estimation technique to derive two-dimensional probability density functions from simulated signal and background samples. The observables are the top quark mass and the invariant mass of two jets from the W decay in the lepton + jets channel, and the top quark mass and the scalar sum of transverse energy of the event in the dilepton channel. We perform a simultaneous fit for the top quark mass and the jet energy scale, which is constrained in situ by the hadronic W boson mass. Using 332 lepton + jets candidate events and 144 dilepton candidate events, we measure the top quark mass to be M-top 171.9 +/- 1.7(stat + JES) +/- 1.1(other syst) GeV/c(2) 171.9 +/- 2.0 GeV/c(2).

引用

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