scholarly journals DIMINISHED UPPER BOUNDS ON THE UNIFICATION MASS SCALES FOR HEAVY HIGGS BOSON MASSES

2006 ◽  
Vol 21 (03) ◽  
pp. 209-212
Author(s):  
V. ELIAS ◽  
S. HOMAYOUNI ◽  
D. J. JEFFREY
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Higgs Sector ◽  
Upper Bounds ◽  
Higher Order ◽  
Scalar Coupling ◽  
Scalar Couplings ◽  
The Standard Model ◽  
Β Function ◽  
Heavy Higgs Boson

We consider dominant three-, four- and five-loop contributions to λ, the quartic scalar coupling-constant's β-function in the Standard Model. We find that these terms accelerate the evolution of λ to nonperturbative values, thereby lowering the unification bound for which scalar-couplings are still perturbative. We also find that these higher order contributions imply a substantial lowering of λ itself before the anticipated onset of nonperturbative physics in the Higgs sector.

EFFECTS OF THE CHARGED HIGGS BOSON ON THE b→sl+l− DECAY

1989 ◽  
Vol 04 (20) ◽  
pp. 1945-1954 ◽  
Author(s):  
M. CIUCHINI
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Higgs Sector ◽  
Higgs Doublet ◽  
Charged Higgs Boson ◽  
The Standard Model ◽  
Charged Higgs ◽  
Free Parameters

The 2H model that resembles the Higgs sector of the minimal N=1 SUSY version of the standard model is considered and the contribution of the charged Higgs boson to the rate of the b→sl+l− transition is studied as a function of the free parameters MH, Mt and the squared two Higgs doublet v.e.v. ratio r. It is shown that this process can be suppressed by the charged Higgs boson contribution and that in general it is not very sensitive to its presence unless (SUSY-forbidden) values of r>1 are assumed.

scholarly journals STATUS OF HIGHER-ORDER CORRECTIONS IN THE STANDARD ELECTROWEAK THEORY

1995 ◽  
Vol 10 (04) ◽  
pp. 443-464 ◽  
Author(s):  
BERND A. KNIEHL
Keyword(s):  
Standard Model ◽  
Higgs Sector ◽  
Higher Order ◽  
Threshold Effects ◽  
Electroweak Theory ◽  
Radiative Corrections ◽  
Gauge Sector ◽  
The Standard Model ◽  
Text Mode ◽  
Higher Order Corrections

We review recent theoretical progress in the computation of radiative corrections beyond one loop within the standard model of electroweak interactions, in both the gauge and Higgs sectors. In the gauge sector, we discuss universal corrections of [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text], and those due to virtual [Formula: see text]-threshold effects, as well as specific corrections to [Formula: see text] of [Formula: see text], [Formula: see text] and [Formula: see text] including finite-mb effects. We also present an update of the hadronic contributions to Δα. Theoretical uncertainties, other than those due to the lack of knowledge of MH and mt, are estimated. In the Higgs sector, we report on the [Formula: see text] corrections to [Formula: see text] including those which are specific for the [Formula: see text] mode, the [Formula: see text] corrections to [Formula: see text] including the finite-mq terms, and the [Formula: see text] corrections to Γ(H → gg).

Heavy-Higgs-boson decays toW+W−Zin the standard model

1992 ◽  
Vol 46 (11) ◽  
pp. 5069-5073 ◽  
Author(s):  
Paul Langacker ◽  
Jiang Liu
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
The Standard Model ◽  
Heavy Higgs Boson

Probing the Higgs Sector at the SSC: the Standard Model and Beyond

1987 ◽  
Vol 02 (04) ◽  
pp. 957-984 ◽  
Author(s):  
J.F. GUNION ◽  
H.E. HABER
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Higgs Sector ◽  
Search Strategies ◽  
Beyond The Standard Model ◽  
Standard Model Higgs Boson ◽  
Higgs Search ◽  
The Standard Model ◽  
Recent Developments

We survey recent developments in techniques for searching for the Standard Model Higgs boson. We also discuss theories that go beyond the Standard Model, and illustrate the extent to which Higgs search strategies must be altered, with respect to the Standard Model approaches, in order to probe the associated Higgs sectors.

NON-STANDARD HIGGS BOSON AND THE DECAY KL→π0l+l−

1988 ◽  
Vol 03 (17) ◽  
pp. 1677-1682 ◽  
Author(s):  
M.I. DOBROLIUBOV ◽  
A. YU. IGNATIEV
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Branching Ratio ◽  
Branching Ratios ◽  
Upper Bounds ◽  
The Standard Model

We investigate various mechanisms of enhancement of the branching ratios of the decay KL→π0l+l− as compared to the predictions of the Standard Model. We propose a model with several Higgs doublets, which contains a Higgs boson with nearly equal couplings to e+e− and µ+µ− pairs. In this model, the branching ratio BR (KL→π0e+e−, π0µ+µ−) can be close to the present experimental upper bounds.

NEW BOUNDS ON THE HIGGS SECTOR OF MINIMAL SUSY

1990 ◽  
Vol 05 (16) ◽  
pp. 1259-1264 ◽  
Author(s):  
JORGE L. LOPEZ ◽  
D.V. NANOPOULOS
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Top Quark ◽  
Quark Mass ◽  
Higgs Mass ◽  
Higgs Sector ◽  
Boson Mass ◽  
Top Quark Mass ◽  
Supersymmetric Extension ◽  
The Standard Model

We examine the Higgs sector of the minimal supersymmetric extension of the standard model. The requirement of perturbative unification combined with the recent LEP data on Higgs boson searches, excludes substantial regions of parameter space. We find that only 0.42 ≤ tan β≲0.76 and tan β≳1.30 are the allowed values for tan β=υ2/υ1. We also determine the absolute lower bound on the lightest Higgs mass to be ≈8 GeV. We conclude that improved lower bounds on the top quark mass and/or the standard model Higgs boson mass will impose yet more stringent constraints on the model. These results clearly favor tan β>1, in agreement with N=1 supergravity or superstring-inspired models.

scholarly journals Higher order and top mass effects in Higgs boson pair production beyond the Standard Model

2018 ◽  
Author(s):  
Gudrun Heinrich ◽  
Gerhard Buchalla ◽  
Matteo Capozi ◽  
Alejandro Celis ◽  
Ludovic Scyboz
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Pair Production ◽  
Higher Order ◽  
Beyond The Standard Model ◽  
Boson Pair ◽  
Boson Pair Production ◽  
Mass Effects ◽  
The Standard Model ◽  
Top Mass

scholarly journals Integrating out heavy fields in the path integral using the background-field method: general formalism

2021 ◽  
Vol 81 (9) ◽  
Author(s):  
Stefan Dittmaier ◽  
Sebastian Schuhmacher ◽  
Maximilian Stahlhofen
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Path Integral ◽  
General Procedure ◽  
Heavy Particle ◽  
Background Field ◽  
Tree Level ◽  
The Standard Model ◽  
The One ◽  
Heavy Higgs Boson

AbstractBuilding on an older method used to derive non-decoupling effects of a heavy Higgs boson in the Standard Model, we describe a general procedure to integrate out heavy fields in the path integral. The derivation of the corresponding effective Lagrangian including the one-loop contributions of the heavy particle(s) is particularly transparent, flexible, and algorithmic. The background-field formalism allows for a clear separation of tree-level and one-loop effects involving the heavy fields. Using expansion by regions the one-loop effects are further split into contributions from large and small momentum modes. The former are contained in Wilson coefficients of effective operators, the latter are reproduced by one-loop diagrams involving effective tree-level couplings. The method is illustrated by calculating potential non-decoupling effects of a heavy Higgs boson in a singlet Higgs extension of the Standard Model. In particular, we work in a field basis corresponding to mass eigenstates and properly take into account non-vanishing mixing between the two Higgs fields of the model. We also show that a proper choice of renormalization scheme for the non-standard sector of the underlying full theory is crucial for the construction of a consistent effective field theory.

scholarly journals HIGGS BOSON AND WLWL SCATTERING AT e−e− COLLIDERS

1996 ◽  
Vol 11 (09) ◽  
pp. 1541-1550 ◽  
Author(s):  
TAO HAN
Keyword(s):  
Higgs Boson ◽  
Scalar Field ◽  
Standard Model ◽  
Cross Section ◽  
Field Model ◽  
Higgs Sector ◽  
Boson Production ◽  
Standard Model Higgs Boson ◽  
Higgs Boson Production ◽  
The Standard Model

We discuss the Standard-Model Higgs boson production in the channels e−e−→e−e−H, e−νW−H, and e−e−ZH. We also illustrate the enhancements in the W–W– cross section that would result from a strongly-interacting Higgs sector or from a H−− resonance in a doublet + triplet scalar field model.

scholarly journals Prospects for Higgs boson scenarios beyond the standard model

2014 ◽  
Vol 31 ◽  
pp. 1460289
Author(s):  
Oscar Stål
Keyword(s):  
Higgs Boson ◽  
Large Hadron Collider ◽  
Standard Model ◽  
Hadron Collider ◽  
Higgs Sector ◽  
Extended Model ◽  
Beyond The Standard Model ◽  
The Standard Model ◽  
Future Data ◽  
Higgs Scalar

The new particle recently discovered at the Large Hadron Collider has properties compatible with those expected for the Standard Model (SM) Higgs boson. However, this does not exclude the possibility that the discovered state is of non-standard origin, as part of an elementary Higgs sector in an extended model, or not at all a fundamental Higgs scalar. We review briefly the motivations for Higgs boson scenarios beyond the SM, discuss the phenomenology of several examples, and summarize the prospects and methods for studying interesting models with non-standard Higgs sectors using current and future data.

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