Bound on anomalous WWH couplings from W L + W L - →H→W L + W L - scattering
01 Sep 1995-Nuovo Cimento Della Societa Italiana Di Fisica A-nuclei Particles and Fields (Società Italiana di Fisica)-Vol. 108, Iss: 9, pp 1157-1160
TL;DR: In this article, the Goldstone-boson equivalence theorem was used to compute the scattering of WWH couplings in the most general Lorentz covariant WWH vertex.
Abstract: Using the Goldstone-boson equivalence theorem, we compute the scattering W
L
+
W
L
−
→H→W
L
+
W
L
−
assuming anomalous WWH couplings. The most general Lorentz covariant WWH vertex contains oneCP-even and oneCP-odd arbitrary parameters. We show that for a centre-of-mass energy
$$\sqrt s $$
⩾M
H
2
,M
W
2
the contribution to theJ=0 partial wave gives no constraint to this parameter. ForM
W
2
⩽
$$\sqrt s $$
⩽M
H
2
, in order that theJ=0 partial wave does not violate unitarity requires this parameter be in the interval (−4.8 Λ/M
H
2
, +0.8 Λ/M
H
2
), where Λ is an energy scale.
Citations
More filters
01 Jun 1988
TL;DR: Using some new techniques, it is concluded that it is possible to detect longitudinal {ital W} 's even in the presence of background, and to detect a heavy Higgs boson (mass {ge}1 TeV) if it exists.
Abstract: Using some new techniques we examine ways to experimentally study interactions of longitudinal {ital W} bosons in the TeV region, and to detect a heavy Higgs boson (mass {ge}1 TeV) if it exists. This is a problem that must be solved if we are eventually to fully understand and test how the SU(2){times}U(1) symmetry of the standard model is broken. To do so at a hadron collider requires methods to discriminate against large backgrounds. We use a new method based on the color properties of the signal and background, leading to a multiplicity cut, and we use analysis techniques that do not reduce the signal events by strong cuts. Our techniques do not bias {ital W} decay distributions and we conclude that it is possible to detect longitudinal {ital W} 's even in the presence of background. Results are given for how it is possible to study these matters at the Superconducting Super Collider. The use of the equivalence theorem'' between longitudinal {ital W} 's and Goldstone scalars is examined in several ways; in particular, we emphasize that in practice the equivalence does not hold numerically when the widths of heavy resonances are included in the traditional way, i.e., usingmore » the Breit-Wigner prescription. The violations are numerically large.« less
1 citations
References
More filters
Book•
01 Jan 1990
TL;DR: The Higgs Hunter's Guide as mentioned in this paper is a comprehensive and comprehensive guide to the physics of Higgs bosons and discusses the extended Higgs sectors required by those recent theoretical approaches that go beyond the Standard Model, including supersymmetry and superstring inspired models.
Abstract: The Higgs Hunter's Guide is a definitive and comprehensive guide to the physics of Higgs bosons. In particular, it discusses the extended Higgs sectors required by those recent theoretical approaches that go beyond the Standard Model, including supersymmetry and superstring-inspired models.
2,757 citations
TL;DR: In this article, it was shown that if the Higgs boson mass exceeds Mc=(8π23GF)12 partial-wave unitarity is not respected by the tree diagrams for two-body reactions of gauge bosons, then the weak interactions must become strong.
Abstract: It is shown that if the Higgs boson mass exceeds Mc=(8π23GF)12 partial-wave unitarity is not respected by the tree diagrams for two-body reactions of gauge bosons, and the weak interactions must become strong.
493 citations
TL;DR: Anomalously large cross sections for multi W and Z final states will occur at SSC energies if electroweak symmetry breaking is due to new strong interactions as mentioned in this paper, which is not the case here.
139 citations
TL;DR: Estimates of the sensitivity of new experiments measuring the muon's [ital g][minus]2 to the scale of physics underlying the standard model are provided.
Abstract: We investigate the use of effective Lagrangians to describe the effects on high-precision observables of physics beyond the standard model. Using the anomalous magnetic moment of the muon as an example, we detail the use of effective vertices in loop calculations. We then provide estimates of the sensitivity of new experiments measuring the muon's [ital g][minus]2 to the scale of physics underlying the standard model.
48 citations
TL;DR: It is found that the dominant decay rates GAMMA and GAMMA are enhanced by a factor 1 and heavy-Higgs-boson production from W/sup +/W/sup -/ and ZZ fusion is increased.
Abstract: A simple formalism, based on the Goldstone-boson equivalence theorem, is described for calculating O(g/sup 2/m/sub H//sup 2/m/sub W//sup 2/) radiative corrections in the standard model. We apply this method to heavy-Higgs-boson decays and find that the dominant decay rates GAMMA(H..-->..W/sup +/W/sup -/) and GAMMA(H..-->..ZZ) are enhanced by a factor 1+(g/sup 2/8..pi../sup 2/)(m/sub H//sup 2/m/sub W//sup 2/) (1916-3)8..sqrt..3 ..pi..+(548..pi../sup 2/). The same enhancement applies to heavy-Higgs-boson production from W/sup +/W/sup -/ and ZZ fusion. Corrections of O(g/sup 2/lnm/sub H/) are also briefly discussed.
39 citations