Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Measurement of the W+W−γ cross-section and first direct limits on anomalous electroweak quartic gauge couplings
AU - Abbiendi, G
AU - Ackerstaff, K
AU - Akesson, P F
AU - Alexander, G
AU - Allison, J
AU - Anderson, K J
AU - Arcelli, S
AU - Asai, S
AU - Ashby, S F
AU - Axen, D
AU - Azuelos, G
AU - Bailey, I
AU - Ball, A H
AU - Barberio, E
AU - Barlow, R J
AU - Batley, J R
AU - Baumann, S
AU - Behnke, T
AU - Bell, K W
AU - Bella, G
AU - Bellerive, A
AU - Bentvelsen, S
AU - Bethke, S
AU - Betts, S
AU - Biebel, O
AU - Biguzzi, A
AU - Bloodworth, I J
AU - Bock, P
AU - Bohme, J
AU - Boeriu, O
AU - Bonacorsi, D
AU - Boutemeur, M
AU - Braibant, S
AU - Bright-Thomas, P
AU - Brigliadori, L
AU - Brown, R M
AU - Burckhart, H J
AU - Capiluppi, P
AU - Carnegie, R K
AU - Carter, A A
AU - Carter, J R
AU - Chang, C Y
AU - Charlton, D G
AU - Chrisman, D
AU - Ciocca, C
AU - Clarke, P E L
AU - Clay, E
AU - Cohen, I
AU - Conboy, J E
AU - Kartvelishvili, V
AU - OPAL Collaboration
PY - 1999/12/30
Y1 - 1999/12/30
N2 - A study of W+W- events accompanied by hard photon radiation produced in e(+)e(-) collisions at LEP is presented. Events consistent with two on-shell W-bosons and an isolated photon are selected from 183 pb(-1) of data recorded at root s = 189 GeV. From these data, 17 W+W- gamma candidates are selected with photon energy greater than 10 GeV, consistent with the Standard Model expectation. These events are used to measure the e(+)e(-) --> W+W- gamma cross-section within a set of geometric and kinematic cuts, <(sigma)over cap>(WW gamma) = 136 +/- 37 +/- 8 fb, where the first error is statistical and the second systematic. The photon energy spectrum is used to set the first direct, albeit weak, limits on possible anomalous contributions to the W+W- gamma gamma and W+W- gamma Z(0) vertices:0.070GeV(-2) < a(0)/Lambda(2) < 0.070 GeV-2,0.13GeV(-2) < a(c)/Lambda(2) < 0.19 GeV-2,0.61GeV(-2) < a(n)/Lambda(2) < 0.57 GeV-2,where Lambda represents the energy scale for new physics. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
AB - A study of W+W- events accompanied by hard photon radiation produced in e(+)e(-) collisions at LEP is presented. Events consistent with two on-shell W-bosons and an isolated photon are selected from 183 pb(-1) of data recorded at root s = 189 GeV. From these data, 17 W+W- gamma candidates are selected with photon energy greater than 10 GeV, consistent with the Standard Model expectation. These events are used to measure the e(+)e(-) --> W+W- gamma cross-section within a set of geometric and kinematic cuts, <(sigma)over cap>(WW gamma) = 136 +/- 37 +/- 8 fb, where the first error is statistical and the second systematic. The photon energy spectrum is used to set the first direct, albeit weak, limits on possible anomalous contributions to the W+W- gamma gamma and W+W- gamma Z(0) vertices:0.070GeV(-2) < a(0)/Lambda(2) < 0.070 GeV-2,0.13GeV(-2) < a(c)/Lambda(2) < 0.19 GeV-2,0.61GeV(-2) < a(n)/Lambda(2) < 0.57 GeV-2,where Lambda represents the energy scale for new physics. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
KW - MONTE-CARLO PROGRAM
KW - W-PAIR PRODUCTION
KW - E(+)E(-) COLLISIONS
KW - E+E ANNIHILATION
KW - EVENT GENERATOR
KW - BOSON
KW - LEP
KW - DETECTOR
KW - PHYSICS
KW - COLLIDERS
U2 - 10.1016/S0370-2693(99)01357-X
DO - 10.1016/S0370-2693(99)01357-X
M3 - Journal article
VL - 471
SP - 293
EP - 307
JO - Physics Letters B
JF - Physics Letters B
SN - 0370-2693
IS - 2-3
ER -