Measurement of the mass and width of the W boson

Abbiendi, G. and Ainsley, C. and Akesson, P. F. and Alexander, G. and Anagnostou, G. and Anderson, K. J. and Asai, S. and Axen, D. and Bailey, I. and Barberio, E. and Barillari, T. and Barlow, R. J. and Batley, R. J. and Bechtle, P. and Behnke, T. and Bell, K. W. and Bell, P. J. and Bella, G. and Bellerive, A. and Benelli, C. and Bethke, S. and Biebel, O. and Boeriu, O. and Bock, P. and Boutemeur, M. and Braibant, S. and Brown, R. M. and Burckhart, H. J. and Campana, S. and Capiluppi, P. and Carnegie, R. K. and Carter, A. A. and Carter, J. R. and Chang, C. Y. and Charlton, D. C. and Ciocca, C. and Csilling, A. and Cuffiani, M. and Dado, S. and De Roeck, A. and De Wolf, E. A. and Desch, K. and Dienes, B. and Dubbert, J. and Duchovni, E. and Duckeck, G. and Duerdoth, I. P. and Etzion, E. and Fabbri, F. and Ferrari, P. and , OPAL Collaboration (2006) Measurement of the mass and width of the W boson. European Physical Journal C: Particles and Fields, 45 (2). pp. 307-335. ISSN 1434-6044

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The mass and width of the W boson are measured using e(+)e(-) -> W+W- events from the data sample collected by the OPAL experiment at LEP at centre-of-mass energies between 170 GeV and 209 GeV. The mass (m(W)) and width (Gamma(W)) are determined using direct reconstruction of the kinematics of W+W- -> q (q) over bar lfv and W+W- -> q (q) over barq (q) over bar events. When combined with previous OPAL measurements using W+W- -> lvlv events and the dependence on m(W) of the WW production cross-section at threshold, the results are determined to be m(W) = 80.415 +/- 0.042 +/- 0.030 +/- 0.009 GeV Gamma(W) = 1.996 +/- 0.096 +/- 0.102 +/- 0.003 GeV where the first error is statistical, the second systematic and the third due to uncertainties in the value of the LEP beam energy. By measuring m(W) in the q (q) over barq (q) over bar channel using several different determinations of the direction of jets with differing sensitivities to soft particles, a limit is also obtained on possible final-state interactions due to colour reconnection effects in W+W- -> q (q) over barq (q) over bar events. The consistency of the results for the W mass and width with those inferred from other electroweak parameters provides an important test of the Standard Model of electroweak interactions.

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Journal Article
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European Physical Journal C: Particles and Fields
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Deposited On:
09 Mar 2012 02:59
Last Modified:
11 Jun 2020 02:03