Artigo
Combination of CDF and D0 measurements of the W boson helicity in top quark decays
Fecha
2012-04-27Registro en:
Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 85, n. 7, 2012.
1550-7998
1550-2368
10.1103/PhysRevD.85.071106
2-s2.0-84860492123
2-s2.0-84860492123.pdf
Autor
Centro Brasileiro de Pesquisas Físicas (CBPF)
Universidade do Estado do Rio de Janeiro (UERJ)
Universidade Federal do ABC (UFABC)
McGill University
University of Science and Technology of China
Academia Sinica
Universidad de los Andes
Center for Particle Physics
Czech Technical University in Prague
Academy of Sciences of the Czech Republic
Universidad San Francisco de Quito
University of Helsinki
CNRS/IN2P3
Institut National Polytechnique de Grenoble
SPP
RWTH Aachen University
Universität Freiburg
Georg-August-Universität Göttingen
Karlsruhe Institute of Technology
Universität Mainz
Ludwig-Maximilians-Universität München
Bergische Universität Wuppertal
University of Athens
Panjab University
Delhi University
Tata Institute of Fundamental Research
University College Dublin
Istituto Nazionale di Fisica Nucleare Bologna
University of Bologna
Istituto Nazionale di Fisica Nucleare
Sezione di Padova-Trento
University of Padova
Istituto Nazionale di Fisica Nucleare Pisa
University of Pisa
University of Siena
Scuola Normale Superiore
Sezione di Roma 1
Sapienza Università di Roma
Istituto Nazionale di Fisica Nucleare Trieste/Udine
University of Udine
Okayama University
Osaka City University
Waseda University
University of Tsukuba
Kyungpook National University
Korea University
CINVESTAV
Science Park
Radboud University Nijmegen
Joint Institute for Nuclear Research
Institute for Theoretical and Experimental Physics (ITEP)
Moscow State University
Institute for High Energy Physics
Petersburg Nuclear Physics Institute
Comenius University
Universitat Autonoma de Barcelona
Institut de Física d'Altes Energies (IFAE)
Centro de Investigaciones Energeticas Medioambientales y Tecnologicas
CSIC-University of Cantabria
Uppsala University
University of Geneva
Glasgow University
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Imperial College London
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University of Arizona
Ernest Orlando Lawrence Berkeley National Laboratory
University of California, Davis
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Fermi National Accelerator Laboratory
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Institute of Experimental Physics
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ETH
CERN
University of London
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National Research Nuclear University
University of California Santa Cruz
Yarmouk University
Muons, Inc.
UPIITA-IPN
University of Cyprus
DESY
SLAC
Cornell University
Chonbuk National University
Kinki University
University of Fukui
University of California Santa Barbara
Chonnam National University
Texas Tech University
Centro de Investigacion en Computacion-IPN
Sezione di Cagliari
University of Iowa
Universidad Autonoma de Sinaloa
Universidad Tecnica Federico Santa Maria
U.S. Department of Energy
Universidade Estadual Paulista (Unesp)
Nagasaki Institute of Applied Science
University of California Irvine
Korea Institute of Science and Technology Information
Simon Fraser University
University of Toronto
TRIUMF
Université de Lyon
Seoul National University
Sungkyunkwan University
Resumen
We report the combination of recent measurements of the helicity of the W boson from top quark decay by the CDF and D0 collaborations, based on data samples corresponding to integrated luminosities of 2.7-5.4fb -1 of pp̄ collisions collected during Run II of the Fermilab Tevatron collider. Combining measurements that simultaneously determine the fractions of W bosons with longitudinal (f 0) and right-handed (f +) helicities, we find f 0=0.722±0.081[±0.062(stat)±0.052(syst)] and f +=-0.033±0.046[±0.034(stat)±0.031(syst)]. Combining measurements where one of the helicity fractions is fixed to the value expected in the standard model, we find f 0=0.682±0. 057[±0.035(stat)±0.046(syst)] for fixed f + and f +=-0.015±0.035[±0.018(stat)±0.030(syst)] for fixed f 0. The results are consistent with standard model expectations. © 2012 American Physical Society.