scholarly journals Higgs-mass predictions in the MSSM and beyond

2021 ◽  
Vol 81 (5) ◽  
Author(s):  
P. Slavich ◽  
S. Heinemeyer ◽  
E. Bagnaschi ◽  
H. Bahl ◽  
M. Goodsell ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Distinctive Feature ◽  
Higgs Mass ◽  
Precise Measurement ◽  
Current Status ◽  
Comprehensive Overview ◽  
The Standard Model ◽  
Supersymmetric Models ◽  
Theoretical Predictions ◽  
The Many

AbstractPredictions for the Higgs masses are a distinctive feature of supersymmetric extensions of the Standard Model, where they play a crucial role in constraining the parameter space. The discovery of a Higgs boson and the remarkably precise measurement of its mass at the LHC have spurred new efforts aimed at improving the accuracy of the theoretical predictions for the Higgs masses in supersymmetric models. The “Precision SUSY Higgs Mass Calculation Initiative” (KUTS) was launched in 2014 to provide a forum for discussions between the different groups involved in these efforts. This report aims to present a comprehensive overview of the current status of Higgs-mass calculations in supersymmetric models, to document the many advances that were achieved in recent years and were discussed during the KUTS meetings, and to outline the prospects for future improvements in these calculations.

scholarly journals PRECISION MASS DETERMINATION OF THE HIGGS BOSON AT PHOTON–PHOTON COLLIDERS

2000 ◽  
Vol 15 (16) ◽  
pp. 2605-2611 ◽  
Author(s):  
TOMOMI OHGAKI
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Higgs Mass ◽  
Statistical Error ◽  
High Energy ◽  
Boson Mass ◽  
Total Width ◽  
Mass Determination ◽  
The Standard Model

We demonstrate a measurement of the Higgs boson mass by the method of energy scanning at photon–photon colliders, using the high energy edge of the photon spectrum. With an integrated luminosity of 50 fb-1 it is possible to measure the standard model Higgs mass to within 110 MeV in photon–photon collisions for mh=100 GeV. As for the total width of the Higgs boson, the statistical error ΔΓh/Γh SM=0.06 is expected for mh=100 GeV, if both Γ(h→γγ) and [Formula: see text] are fixed at the predicted standard model value.

scholarly journals CONSTRAINTS ON THE ELECTROWEAK UNIVERSAL PARAMETERS AND THE TOP AND HIGGS MASSES FROM UPDATED LEP/SLC DATA

1995 ◽  
Vol 10 (33) ◽  
pp. 2553-2569 ◽  
Author(s):  
SEIJI MATSUMOTO
Keyword(s):  
Form Factor ◽  
Higgs Boson ◽  
Top Quark ◽  
Higgs Mass ◽  
Global Analysis ◽  
Mean Value ◽  
The Standard Model ◽  
The Mean ◽  
The Masses ◽  
Vertex Form Factor

A global analysis is performed using the recent data from LEP and SLC. Constraints on the electroweak universal parameters (S, T, U) and on the masses of the top quark and Higgs boson within the standard model (SM) are investigated. The uncertainties due to the QCD and QED effective couplings, αs(mz) and , [Formula: see text] are examined in detail. Even though the mean value of S is increased to be consistent with zero, the naive Technicolor models are still disfavored due to its reduced error. Within the SM, we find the 90% CL constraints; 133 GeV<mt<190 GeV and 10 GeV<mH< 440 GeV for αs(mz)=0.116 and [Formula: see text]. The experimental constraints on the ZbLbL vertex form factor, [Formula: see text] play an important role in disfavoring the region of large mt(mt~200GeV) and large mH(mH~1000 GeV). If mt is precisely known, the present electroweak data give a rather strict upper bound on the Higgs mass, mH<140(300) GeV at 95% CL, for mt=160(175) GeV and for the above αs(mz) and [Formula: see text].

scholarly journals Mixing and CP Violation in the Charm System

2021 ◽  
Vol 71 (1) ◽  
Author(s):  
Alexander Lenz ◽  
Guy Wilkinson
Keyword(s):  
Cp Violation ◽  
Online Publication ◽  
Charm Physics ◽  
Science Volume ◽  
Current Status ◽  
Annual Review ◽  
Publication Date ◽  
Theoretical Understanding ◽  
The Standard Model ◽  
Theoretical Predictions

In recent years charm physics has undergone a renaissance, which has been catalyzed by an unexpected and impressive set of experimental results from the B factories, the Tevatron, and LHCb. The existence of [Formula: see text] oscillations is now well established, and the recent discovery of CP violation in D0 decays has further renewed interest in the charm sector. In this article, we review the current status of charm-mixing and CP-violation measurements and assess their agreement with theoretical predictions within the Standard Model and beyond. We look forward to the great improvements in experimental precision that can be expected over the coming two decades and to the prospects for corresponding advances in theoretical understanding. Expected final online publication date for the Annual Review of Nuclear and Particle Science, Volume 71 is September 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

scholarly journals Constraints on a Fourth Generation of Fermions from Higgs Boson Searches

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Alexander Lenz
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Higgs Doublet ◽  
Current Status ◽  
Fourth Generation ◽  
The Past ◽  
The Standard Model

We review the past and current status of the extension of the standard model (SM) by a fourth generation of fermions. In particular the new results for Higgs boson searches at the LHC and at Tevatron exclude the possibility of having simply a perturbative fourth generation of fermions with one Higgs doublet (SM4). We also briefly mention more complicated extensions of the SM4, which are not yet excluded, like adding in addition another Higgs doublet to the SM4.

Physics potential and motivations for a muon collider

2016 ◽  
Vol 31 (18) ◽  
pp. 1630028 ◽  
Author(s):  
Mario Greco
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Recent Work ◽  
Precise Measurement ◽  
Detailed Knowledge ◽  
Higgs Particle ◽  
Fundamental Component ◽  
Physics Potential ◽  
The Standard Model ◽  
Muon Collider

The discovery of the Higgs particle is demanding a detailed knowledge of the properties of this fundamental component of the Standard Model. From the available data however, it cannot be concluded yet that we have found the SM Higgs boson and not one of the scalars postulated within the possible extensions of the SM. It is shown that a Higgs factory through a muon collider is particularly appropriate for precision studies of the properties of this particle. However sizable QED radiative effects — of order of 50% — must be carefully taken into account for a precise measurement of the leptonic and total widths of the Higgs particle. The results presented here are mainly based on a recent work in collaboration of Tao Han and Zhen Liu.

scholarly journals BOUNDS ON THE LIGHTEST HIGGS BOSON MASS WITH THREE AND FOUR FERMION GENERATIONS

1999 ◽  
Vol 14 (10) ◽  
pp. 1605-1632 ◽  
Author(s):  
DAVID DOOLING ◽  
KYUNGSIK KANG ◽  
SIN KYU KANG
Keyword(s):  
Higgs Boson ◽  
Lower Bounds ◽  
Higgs Mass ◽  
Upper Bounds ◽  
Boson Mass ◽  
Fourth Generation ◽  
Higgs Boson Mass ◽  
Supersymmetric Extension ◽  
Vacuum Stability ◽  
The Standard Model

We present lower bounds on the Higgs boson mass in the Standard Model with three and four fermion generations, SM (3,4), as well as upper bounds on the lightest Higgs boson mass in the minimal supersymmetric extension of the SM with three and four generations, MSSM (3,4). Our analysis utilizes the SM (3,4) renormalization-group-improved one-loop effective potential of the Higgs boson to find the upper bounds on the Higgs mass in the MSSM (3,4), while the lower bounds in the SM (3,4) are derived from considerations of vacuum stability. All the bounds increase as the degenerate fourth generation mass increases, providing more room in theory space that respects the increasing experimental lower limit of the Higgs mass.

scholarly journals Extended Scalar Sectors

2020 ◽  
Vol 70 (1) ◽  
pp. 197-223
Author(s):  
Jan Steggemann
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Particle Physics ◽  
Higgs Bosons ◽  
Precision Measurements ◽  
Final States ◽  
The Standard Model ◽  
Supersymmetric Models ◽  
Charged Higgs Bosons ◽  
Generic Extensions

Extended scalar sectors appear in various extensions of the Standard Model of particle physics, such as supersymmetric models. They are also generic extensions of the Standard Model and can address a number of its shortcomings. Direct searches for additional Higgs bosons and measurements of the 125-GeV Higgs boson, both of which provide insights into the different possible sectors, are carried out at the LHC. This review gives an overview of searches for the additional Higgs bosons and their implications for different models. The discussed analyses comprise searches for neutral and charged Higgs bosons that decay in various final states. In addition, the review summarizes the constraints from precision measurements, including in particular the observed couplings of the 125-GeV Higgs boson. While several models naturally incorporate a Higgs boson with couplings that are similar to the ones in the Standard Model, the measurements of the 125-GeV Higgs boson provide constraints on all considered extensions.

scholarly journals HIGGS BOSON IN RG RUNNING INFLATIONARY COSMOLOGY

2012 ◽  
Vol 21 (14) ◽  
pp. 1250094 ◽  
Author(s):  
YI-FU CAI ◽  
DAMIEN A. EASSON
Keyword(s):  
Higgs Boson ◽  
Power Spectrum ◽  
Higgs Mass ◽  
Hadron Collider ◽  
Higgs Sector ◽  
Inflationary Cosmology ◽  
Microwave Background ◽  
Scale Invariant ◽  
Primordial Power Spectrum ◽  
The Standard Model

An intriguing hypothesis is that gravity may be nonperturbatively renormalizable via the notion of asymptotic safety (AS). We show that the Higgs sector of the standard model (SM) minimally coupled to asymptotically safe gravity can generate the observed near scale-invariant spectrum of the Cosmic Microwave Background through the curvaton mechanism. The resulting primordial power spectrum places an upper bound (CMB) on the Higgs mass, which for finely tuned values of the curvaton parameters, is compatible with the recently released Large Hadron Collider (LHC) data.

LOW ENERGY TESTS OF THE STANDARD MODEL: THE 12 GeV PARITY VIOLATION PROGRAM AT JEFFERSON LABORATORY

2010 ◽  
Vol 19 (05n06) ◽  
pp. 927-937 ◽  
Author(s):  
KRISHNA S. KUMAR
Keyword(s):  
Parity Violation ◽  
New Physics ◽  
Low Energy ◽  
Current Status ◽  
Experimental Program ◽  
Target Species ◽  
Polarized Electrons ◽  
The Standard Model ◽  
Theoretical Predictions ◽  
Sufficient Precision

We discuss the current status and prospects of an experimental program of parity-violating asymmetry measurements in the scattering of longitudinally polarized electrons off unpolarized fixed targets. In particular, we focus on those measurements where judicious choices of target species and kinematics allows the theoretical predictions to be made purely in terms of fundamental electroweak couplings with little theoretical uncertainty. If such asymmetries are measured with sufficient precision, they are sensitive to new physics at the TeV scale. After reviewing recent results, two new experimental initiatives called MOLLER and SoLID being designed for the Jefferson Laboratory 12 GeV upgrade are discussed.

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.

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