Discovering non-Abelian weak couplings and an anomalous magnetic dipole moment of the W± at LEP 2

Kuss, I.; Schildknecht, Dieter

doi:10.1016/0370-2693(96)00770-8

Cited by 14 publications

(12 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First it is interesting to test if the coupling between the Z and a pair of W bosons exists [31]. Neglecting the contributions of dimension-six operators, assuming that all electromagnetic properties of the W boson are standard and that a custodial SU(2) symmetry is respected leaves a single parameter, Z [31].…”

Section: Gauge Couplings Of the W Bosonmentioning

confidence: 99%

“…Neglecting the contributions of dimension-six operators, assuming that all electromagnetic properties of the W boson are standard and that a custodial SU(2) symmetry is respected leaves a single parameter, Z [31]. This parameter describes the deviation of the ZWW coupling, g ZWW , from its Standard Model value of cot W ' 1:9, where W is the electroweak mixing angle.…”

Section: Gauge Couplings Of the W Bosonmentioning

confidence: 99%

“…This parameter describes the deviation of the ZWW coupling, g ZWW , from its Standard Model value of cot W ' 1:9, where W is the electroweak mixing angle. The model is extended to include anomalous electromagnetic properties of the W boson, such a s a n additional contribution to its magnetic moment, = 1 [31].…”

Section: Gauge Couplings Of the W Bosonmentioning

confidence: 99%

“…The corresponding contour curves of 68% and 95% probability in the ( Z ; ) plane are shown in Figure 5. The special cases, Z = cot W , i.e., vanishing ZWW coupling, and Z = tan W cot W , where weak triplegauge-boson couplings come about only by /Z mixing (ĝ = 0) [31], are excluded by more than 95% condence level. …”

Section: Gauge Couplings Of the W Bosonmentioning

confidence: 99%

See 3 more Smart Citations

Measurements of mass, width and gauge couplings of the W boson at LEP

Acciarri¹,

Адриани²,

Aguilar-Benı́tez³

et al. 1997

Physics Letters B

View full text Add to dashboard Cite

We report on measurements of mass and total decay width of the W boson and of triple-gauge-boson couplings, WW and ZWW, with the L3 detector at LEP. W-pair events produced in e + e interactions between 161 GeV and 172 GeV centreof-mass energy are selected in a data sample corresponding to a total luminosity of 21.2 pb 1 . The mass and total decay width of the W boson are determined to be M W = 80:75 +0:26 0:27 (exp:) 0:03 (LEP) GeV and W = 1:74 +0:88 0:78 (stat:) 0:25 (syst:) G e V, respectively. Limits on anomalous triple-gauge-boson couplings, WW and ZWW, are determined, in particular 1:5 < Z < 1 : 9 (95% CL), excluding vanishing ZWW coupling at more than 95% condence level. Submitted to Phys. Lett. B 1 IntroductionFor the 1996 data taking period, the centre-of-mass energy, p s, of the e + e collider LEP at CERN was increased to 161 GeV, 170 GeV and 172 GeV. This allowed for the rst time the pair-production of on-shell W bosons in e + e interactions, e + e ! W + W . Analysis of Wpair production adds important knowledge to the Standard Model of electroweak interactions [1] through the measurements of mass and width of the W boson and of the triple-gauge-boson couplings WW and ZWW [2,3]. These parameters were rst measured at p p colliders [4{6].The total W-pair production cross section as calculated within the Standard Model depends on p s and on the mass and total width of the W boson, M W and W . Results for M W derived from total cross section measurements have been published by L3 [7, 8] and the other LEP experiments [9,10]. In this letter a more precise determination of M W and a rst determination of W is presented based on the invariant mass of the W-boson decay products.To lowest order within the Standard Model, three Feynman diagrams contribute to Wpair production, the s-channel and Z-boson exchange and the t-channel e exchange. The s-channel diagrams arise as a consequence of the triple-gauge-boson vertices WW and ZWW which are expected due to the non-Abelian gauge structure of the electroweak theory [1,3]. Results for triple-gauge-boson couplings derived from the data collected at p s = 161 GeV h a v e been published by L3 [7, 11] and the other LEP experiments [10,12]. Here a determination of triple-gauge-boson couplings is presented based on total and dierential cross sections in W-pair mediated four-fermion production.The L3 detector is described in detail in Reference 13. During the 1996 run the L3 detector collected total integrated luminosities of 10.9 pb 1 at p s = 161:34 GeV (threshold data), and 1.0 pb 1 and 9.3 pb 1 at p s = 170:31 GeV and at p s = 172:32 GeV (high-energy data). These centre-of-mass energies are known to 0:06 GeV [14]. The results obtained at threshold and from the high-energy data are combined to determine the mass of the W boson and triplegauge-boson couplings. Analysis of Four-Fermion ProductionThe W boson decays into a quark-antiquark pair, such a s W ! ud or cs, or a lepton-antilepton pair, W !` `(`= e ; ; ); in the following denoted as qq,` or f f in general fo...

show abstract

Section: Gauge Couplings Of the W Bosonmentioning

confidence: 99%

Section: Gauge Couplings Of the W Bosonmentioning

confidence: 99%

Section: Gauge Couplings Of the W Bosonmentioning

confidence: 99%

Section: Gauge Couplings Of the W Bosonmentioning

confidence: 99%

See 2 more Smart Citations

Measurements of mass, width and gauge couplings of the W boson at LEP

Acciarri¹,

Адриани²,

Aguilar-Benı́tez³

et al. 1997

Physics Letters B

View full text Add to dashboard Cite

show abstract

“…Adopting a two-parameter model [57] which is equivalent to α W Φ , α BΦ = 0 and α W = 0, the following preliminary limits were obtained at LEP 2 [56], |δ Z | < 1.9, −2.5 < x γ < 3.8, 95% CL.…”

Section: Para-unitaritymentioning

confidence: 99%

Gauge boson pair production at the LHC: Anomalous couplings and vector boson scattering

Kuss¹,

Nuss²

1998

Eur. Phys. J. C

Self Cite

View full text Add to dashboard Cite

We compare vector boson fusion and quark antiquark annihilation production of vector boson pairs at the LHC and include the effects of anomalous couplings. Results are given for confidence intervals for anomalous couplings at the LHC assuming that measurements will be in agreement with the standard model. We consider all couplings of the general triple vector boson vertex and their correlations. In addition we consider a gauge invariant dimension-six extension of the standard model. Analytical results for the cross sections for quark antiquark annihilation and vector boson fusion with anomalous couplings are given.

show abstract

Results on Triple Gauge-Boson Couplings from LEP2

Weber

1999

International Europhysics Conference on High Energy Physics

View full text Add to dashboard Cite

Discovering non-Abelian weak couplings and an anomalous magnetic dipole moment of the W± at LEP 2

Cited by 14 publications

References 15 publications

Measurements of mass, width and gauge couplings of the W boson at LEP

Measurements of mass, width and gauge couplings of the W boson at LEP

Gauge boson pair production at the LHC: Anomalous couplings and vector boson scattering

Results on Triple Gauge-Boson Couplings from LEP2

Contact Info

Product

Resources

About