Abstract
The mass of the W boson is determined from the direct reconstruction of W decays in WW→qq̄qq̄ and WW→ℓνqq̄ events in e+e- collisions at LEP. The data sample corresponds to an integrated luminosity of 683 pb-1 collected with the ALEPH detector at centre-of-mass energies up to 209 GeV. To minimise any effect from colour reconnection a new procedure is adopted in which low energy particles are not considered in the mass determination from the qq̄qq̄ channel. The combined result from all channels is \(m_{\text{W}}=80.440 \pm0.043{\text{(stat.)}} \pm0.024{\text{(syst.)}} \pm0.009{\text{(FSI)}} \pm0.009{\text{(LEP)}} \text{GeV/}c^2, \)where FSI represents the possible effects of final state interactions in the qq̄qq̄ channel and LEP indicates the uncertainty in the beam energy. From two-parameter fits to the W mass and width, the W width is found to be \(\Gamma_{\text{W}} = 2.14 \pm0.09{\text{(stat.)}} \pm0.04{\text{(syst.)}} \pm0.05{\text{(FSI)}} \pm0.01{\text{(LEP)}} \text{GeV}. \)
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
The ALEPH, DELPHI, L3, OPAL, SLD Collaborations, the LEP Electroweak Working Group, the SLD Electroweak, Heavy Flavour Groups, Precision Electroweak Measurements on the Z Resonance, Phys. Rep. 427, 257–454 (2006)
The CDF, D0 Collaborations, the Tevatron Electroweak Working Group, Combination of CDF and D0 results on the top-quark mass, hep-ex/0404010, (2004)
ALEPH Collaboration, Phys. Lett. B 422, 384 (1998)
ALEPH Collaboration, Phys. Lett. B 453, 121 (1999)
ALEPH Collaboration, Eur. Phys. J. C 17, 241 (2000)
ALEPH Collaboration, Phys. Lett. B 401, 347 (1997)
ALEPH Collaboration, Phys. Lett. B 415, 435 (1997)
ALEPH Collaboration, Eur. Phys. J. C 38, 147 (2004)
S. Jadach et al., Comp. Phys. Commun. 140, 432 (2001)
ALEPH Collaboration, Nucl. Inst. Meth. A 294, 121 (1990)
ALEPH Collaboration, Nucl. Inst. Meth. A 360, 481 (1995)
GEANT3 Manual, CERN Program Library Long Writeup W5013 (1994)
Y.L. Dokshitzer, J. Phys. G 17, 1441 (1991)
S. Jadach et al., Comp. Phys. Commun. 140, 475 (2001)
T. Sjöstrand, Comp. Phys. Commun. 82, 74 (1994)
T. Sjöstrand et al., Comp. Phys. Commun. 135, 238 (2001)
G. Corcella et al., JHEP 0101, 010 (2001)
L. Lönnblad, Comput. Phys. Commun. 71, 15 (1992)
T. Sjöstrand, V.A. Khoze, Z. Phys. C 62, 281 (1994); Phys. Rev. Lett. 72, 28 (1994)
J. Rathsman, Phys. Lett. B 452, 364 (1999); A. Edin, G. Ingelman, J. Rathsman, Phys. Lett. B 366, 371 (1996); Z. Phys. C 75, 57 (1997)
L. Lönnblad, Z. Phys. C 70, 107 (1996) and private communication
L. Lönnblad, T. Sjöstrand, Phys. Lett. B 351, 293 (1995)
L. Lönnblad, T. Sjöstrand, Eur. Phys. J. C 2, 165 (1998)
S. Jadach, B.F.L. Ward, Z. Was, Comput. Phys. Commun. 130, 260 (2000)
J.A.M. Vermaseren, Proceedings of the IV International Workshop on Gamma Gamma Interactions, ed. by G. Cochard, P. Kessler (1980)
S. Jadach et al., Phys. Lett. B 390, 298 (1997)
D. Boumediene, Mesure de la masse du boson W± dans l’expérience ALEPH, Thèse de Doctorat de l’Université Paris VI (2002), DAPNIA-2002-03-T, CERN-THESIS-2003-008
W. Bartel et al., Z. Phys. C 33, 23 (1986); S. Bethke et al., Phys. Lett. B 213, 235 (1988)
Determination of the mass of the W boson, in Physics at LEP2, CERN 96-01, ed. by G. Altarelli, T. Sjöstrand, F. Zwirner, vol. 1, p. 141
V.A. Khoze, T. Sjostrand, Z. Phys. C 70, 625 (1996); W. Beenakker, A.P. Chapovsky, F.A. Berends, Nucl. Phys. B 508, 17 (1997); Phys. Lett. B 411, 203 (1997); A. Denner, S. Dittmaier, M. Roth, Phys. Lett. B 429, 145 (1998); Nucl. Phys. B 519, 39 (1998)
T. Sjöstrand, private communication
ALEPH Collaboration, Test of colour reconnection models using three-jet events in hadronic Z decays, hep-ex/ 0604042, submitted to Eur. Phys. J. C
H. Ruiz-Pérez, Measurement of the W mass from the WW→qq̄qq̄ channel with the ALEPH detector, Ph.D. Dissertation Universitat Autònoma de Barcelona, CERN-THESIS-2003-004
R. Assmann et al., LEP Energy Working Group, Eur. Phys. J. C 39, 253 (2005)
ALEPH Collaboration, Eur. Phys. J. C 5, 205 (1998)
S. Jadach, K. Zalewski, Acta Phys. Pol. B 28, 1363 (1997)
A.P. Chapovsky, V.A. Khoze, Eur. Phys. J. C 9, 449 (1999)
M. Skrzypek et al., Phys. Lett. B 523, 117 (2001); W. Placzek, private communication
F. Cossutti, Eur. Phys. J. C 44, 383 (2005)
A. Denner, S. Dittmaier, M. Roth, D. Wackeroth, Nucl. Phys. B 560, 33 (1999); Nucl. Phys. B 587, 67 (2000); Phys. Lett. B 475, 127 (2000); EPJdirect C Vol.2 4, 1 (2000)
ALEPH Collaboration, Phys. Lett. B 478, 50 (2000)
ALEPH Collaboration, Phys. Lett. B 606, 265 (2005)
ALEPH Collaboration, Phys. Lett. B 464, 339 (1999)
DELPHI Collaboration, A Determination of the Centre-of-Mass Energy at LEP2 using Radiative 2-fermion Events, CERN-PH-EP/2005-050, to be published in Eur. Phys. J. C.; L3 Collaboration, Phys. Lett. B 585, 42 (2004); OPAL Collaboration, Phys. Lett. B 604, 31 (2004)
OPAL Collaboration, Eur. Phys. J. C 45, 307 (2006)
L3 Collaboration, Eur. Phys. J. C 45, 569 (2006)
DELPHI Collaboration, Phys. Lett. B 511, 159 (2001)
CDF Collaboration, Phys. Rev. D 64, 052001 (2001); D0 Collaboration, Phys. Rev. D 66, 012001 (2002)
ALEPH Collaboration, Phys. Rep. 294, 1 (1998)
Author information
Authors and Affiliations
Consortia
Rights and permissions
About this article
Cite this article
Schael, S., Barate, R., Brunelière, R. et al. Measurement of the W boson mass and width in e+e- collisions at LEP. Eur. Phys. J. C 47, 309–335 (2006). https://doi.org/10.1140/epjc/s2006-02576-8
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1140/epjc/s2006-02576-8