scholarly journals A possibility of Lorentz violation in the Higgs sector

2019 ◽  
Vol 35 (10) ◽  
pp. 2050064 ◽  
Author(s):  
Satoshi Iso ◽  
Noriaki Kitazawa
Keyword(s):  
Higgs Boson ◽  
Dimensional Space ◽  
Higgs Field ◽  
Higgs Sector ◽  
Angular Frequency ◽  
Energy Scale ◽  
Boson Mass ◽  
Effective Theory ◽  
Higher Dimensional ◽  
Phenomenological Consequence

In string theory, a scalar field often appears as a moduli of a geometrical configuration of D-branes in higher-dimensional space. In the low energy effective theory on D-branes, the distance between D-branes is translated into the energy scale of the gauge symmetry breaking. In this paper, we study a phenomenological consequence of a possibility that the Higgs field is such a moduli field and the D-brane configuration is stabilized by a stationary motion, in particular, revolution of D-branes on which we live. Then, due to the Coriolis force, Higgs mode is mixed with the angular fluctuation of branes and the Lorentz symmetry is violated in the dispersion relation of the Higgs boson. The Higgs boson mass measurements at LHC experiments give an upper bound [Formula: see text][Formula: see text][Formula: see text] GeV for the angular frequency of the revolution of D-branes.

scholarly journals A Proposed SUSY Alternative (SUSYA) Based on a New Type of Seesaw Mechanism Applicable to All Elementary Particles and Predicting a New Type of Aether Theory

2020 ◽  
pp. 19-52
Author(s):  
Andrei-Lucian Drăgoi
Keyword(s):  
Higgs Boson ◽  
W Boson ◽  
Higgs Field ◽  
Energy Scale ◽  
Elementary Particles ◽  
Fermion Mass ◽  
Physical Vacuum ◽  
Zero Energy ◽  
Seesaw Mechanism ◽  
New Type

This paper proposes a potentially viable “out-of-the-box” alternative (called “SUSYA”) to the currently known supersymmetry (SUSY) theory variants: SUSYA essentially proposes a new type of seesaw mechanism (SMEC) applicable to all elementary particles (EPs) and named “Z-SMEC”; Z-SMEC is a new type of charge-based mass symmetry/”conjugation” between EPs which predicts the zero/non-zero rest masses of all known/unknown EPs, EPs that are “conjugated” in boson-fermion pairs sharing the same electromagnetic charge (EMC). Z-SMEC is actually derived from an extended zero-energy hypothesis (eZEH) which is essentially a conservation principle applied on zero-energy (assigned to the ground state of vacuum) that mainly states a general quadratic equation governing a form of ex-nihilo creation and having a pair of conjugate boson-fermion mass solutions for each set of given coefficients. eZEH proposes a general formula for all the rest masses of all EPs from Standard model, also indicating the true existence of the graviton and a possible bijective connection between the three types of neutrinos (all predicted to be actually Majorana fermions) and the massless bosons (photon, gluon and the hypothetical graviton), between the electron/positron and the W boson, predicting at least three generations of leptoquarks (LQs) (defined here as the “mass-conjugates” of the three known generations of quarks) and predicting two distinct types of neutral massless fermions (NMFs) (modelled as mass-conjugates of the Higgs boson and Z boson respectively) which may be plausible constituents for a hypothetical lightest possible (hot fermionic) dark matter (LPDM) or, even more plausible, the main constituents of a superfluid fermionic vacuum/aether, as also proposed by the notorious Superfluid vacuum theory (SVT) (in which the physical vacuum is modeled as a bosonic/fermionic superfluid). SUSYA also predicts two hypothetical bosons defined as the ultra-heavy bosonic mass-conjugates of the muon and tauon called here the “W-muonic boson” (Wmb) and the “W-tauonic boson” (Wtb) respectively: Wmb and Wtb are predicted much heavier than the W boson and the Higgs boson so that Wmb and Wtb can be regarded as ultra-heavy charged Higgs bosons with their huge predicted rest energies defining the energy scale at which the electroweak field (EWF) may be unified with the Higgs field (HF).

scholarly journals Electroweak sphaleron for effective theory in the limit of large Higgs boson mass

1995 ◽  
Vol 51 (9) ◽  
pp. 5327-5330 ◽  
Author(s):  
X. Zhang ◽  
B.-L. Young ◽  
S. K. Lee
Keyword(s):  
Higgs Boson ◽  
Boson Mass ◽  
Effective Theory ◽  
Higgs Boson Mass

RICCION FROM HIGHER-DIMENSIONAL SPACE–TIME AND ONE-LOOP RENORMALIZATION

2000 ◽  
Vol 15 (18) ◽  
pp. 2917-2932
Author(s):  
S. K. SRIVASTAVA
Keyword(s):  
Dimensional Space ◽  
Mass Scale ◽  
Space Time ◽  
Energy Scale ◽  
Coupling Constants ◽  
Higher Dimensional Space Time ◽  
Higher Derivative ◽  
Higher Dimensional ◽  
Renormalization Group Equations ◽  
Dimensional Space Time

Using higher-derivative gravitational action in (4+D)-dimensional space–time, Lagrangian density of riccion is obtained with the quartic self-interacting potential. It is found that after compactification to four-dimensional space–time the resulting theory for riccions is one-loop multiplicatively renormalizable. Renormalization group equations are solved and its solutions yield many interesting results such as (i) dependence of extra dimensions on the energy mass scale showing that these dimensions increase with the increasing mass scale, (ii) phase transition at 1.76×1016 GeV and (iii) dependence of gravitational and other coupling constants on energy scale. Results also suggest that space–time above 1.76×1016 GeV should be fractal.

scholarly journals ACCOUNTING FOR THE FINITENESS OF THE HIGGS–BOSON MASS IN THE 3D GEORGI–GLASHOW MODEL

2002 ◽  
Vol 17 (05) ◽  
pp. 279-288 ◽  
Author(s):  
DMITRI ANTONOV
Keyword(s):  
Higgs Boson ◽  
Weak Coupling ◽  
W Boson ◽  
Higgs Field ◽  
String Tension ◽  
Boson Mass ◽  
Cumulant Expansion ◽  
Debye Mass ◽  
Weak Coupling Approximation ◽  
Order Of Magnitude

(2 + 1)-dimensional Georgi–Glashow model is explored in the regime when the Higgs boson is not infinitely heavy, but its mass is of the same order of magnitude as the mass of the W-boson. In the weak-coupling limit, the Debye mass of the dual photon and the expression for the monopole potential are found. The cumulant expansion applied to the average over the Higgs field is checked to be convergent for the known data on the monopole fugacity. These results are further generalized to the SU (N)-case. In particular, it is found that the requirement of convergence of the cumulant expansion establishes a certain upper bound on the number of colors. This bound, expressed in terms of the parameter of the weak-coupling approximation, allows the number of colors to be large enough. Finally, the string tension and the coupling constant of the so-called rigidity term of the confining string are found at arbitrary number of colors.

scholarly journals Calibration and Performance of the CMS Electromagnetic Calorimeter in LHC Run2

2020 ◽  
Vol 245 ◽  
pp. 02027
Author(s):  
Francesca Cavallari ◽  
Chiara Rovelli
Keyword(s):  
Higgs Boson ◽  
Energy Resolution ◽  
Mass Measurement ◽  
Energy Scale ◽  
Boson Mass ◽  
Electromagnetic Calorimeter ◽  
High Mass ◽  
Final State ◽  
Z Boson Decays ◽  
And Performance

Many physics analyses using the Compact Muon Solenoid (CMS) detector at the LHC require accurate, high resolution electron and photon energy measurements. Excellent energy resolution is crucial for studies of Higgs boson decays with electromagnetic particles in the final state, as well as searches for very high mass resonances decaying to energetic photons or electrons. The CMS electromagnetic calorimeter (ECAL) is a fundamental instrument for these analyses and its energy resolution is crucial for the Higgs boson mass measurement. Recently the energy response of the calorimeter has been precisely calibrated exploiting the full Run2 data, aiming at a legacy reprocessing of the data. A dedicated calibration of each detector channel has been performed with physics events exploiting electrons from W and Z boson decays, photons from π0 and η decays, and from the azimuthally symmetric energy distribution of minimum bias events. This talk presents the calibration strategies that have been implemented and the excellent performance achieved by the CMS ECAL with the ultimate calibration of Run2 data, in terms of energy scale stability and energy resolution.

scholarly journals Resolving the (g − 2)μ discrepancy with $$ \mathcal{F} $$–SU(5) intersecting D-branes

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Joseph L. Lamborn ◽  
Tianjun Li ◽  
James A. Maxin ◽  
Dimitri V. Nanopoulos
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Model Building ◽  
Rare Decay ◽  
Model Space ◽  
Higgs Sector ◽  
Boson Mass ◽  
Light Higgs Boson ◽  
Brane Model ◽  
Extended Higgs Sector

Abstract A discrepancy between the measured anomalous magnetic moment of the muon (g − 2)μ and computed Standard Model value now stands at a combined 4.2σ following experiments at Brookhaven National Lab (BNL) and the Fermi National Accelerator Laboratory (FNAL). A solution to the disagreement is uncovered in flipped SU(5) with additional TeV-Scale vector-like 10 + $$ \overline{\mathbf{10}} $$ 10 ¯ multiplets and charged singlet derived from local F-Theory, collectively referred to as $$ \mathcal{F} $$ F –SU(5). Here we engage general No-Scale supersymmetry (SUSY) breaking in $$ \mathcal{F} $$ F –SU(5) D-brane model building to alleviate the (g −2)μ tension between the Standard Model and observations. A robust ∆aμ(SUSY) is realized via mixing of M5 and M1X at the secondary SU(5) × U(1)X unification scale in $$ \mathcal{F} $$ F –SU(5) emanating from SU(5) breaking and U(1)X flux effects. Calculations unveil ∆aμ(SUSY) = 19.0–22.3 × 10−10 for gluino masses of M($$ \overset{\sim }{g} $$ g ~ )= 2.25–2.56 TeV and higgsino dark matter, aptly residing within the BNL+FNAL 1σ mean. This (g − 2)μ favorable region of the model space also generates the correct light Higgs boson mass and branching ratios of companion rare decay processes, and is further consistent with all LHC Run 2 constraints. Finally, we also examine the heavy SUSY Higgs boson in light of recent LHC searches for an extended Higgs sector.

scholarly journals Dynamical Electroweak Symmetry Breaking with a Heavy Fermion in Light of Recent LHC Results

2013 ◽  
Vol 2013 ◽  
pp. 1-8
Author(s):  
Pham Q. Hung
Keyword(s):  
Higgs Boson ◽  
Symmetry Breaking ◽  
Higgs Field ◽  
New Physics ◽  
Energy Scale ◽  
Electroweak Symmetry Breaking ◽  
Fourth Generation ◽  
Electroweak Symmetry ◽  
Hierarchy Problem ◽  
Quantum Numbers

The recent announcement of a discovery of a possible Higgs-like particle—its spin and parity are yet to be determined—at the LHC with a mass of 126 GeV necessitates a fresh look at the nature of the electroweak symmetry breaking, in particular if this newly-discovered particle will turn out to have the quantum numbers of a Standard Model Higgs boson. Even if it were a 0+scalar with the properties expected for a SM Higgs boson, there is still the quintessential hierarchy problem that one has to deal with and which, by itself, suggests a new physics energy scale around 1 TeV. This paper presents a minireview of one possible scenario: the formation of a fermion-antifermion condensate coming from a very heavy fourth generation, carrying the quantum number of the SM Higgs field, and thus breaking the electroweak symmetry.

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 Flavor violating top decays and flavor violating quark decays of the Higgs boson

2017 ◽  
Vol 32 (22) ◽  
pp. 1750135 ◽  
Author(s):  
Tarek Ibrahim ◽  
Ahmad Itani ◽  
Pran Nath ◽  
Anas Zorik
Keyword(s):  
Higgs Boson ◽  
Top Quark ◽  
Branching Ratio ◽  
Higgs Sector ◽  
Branching Ratios ◽  
Boson Mass ◽  
Tree Level ◽  
Extended Model ◽  
Quark Decays ◽  
Quark Generation

In the Standard Model, flavor violating decays of the top quark and of the Higgs boson are highly suppressed. Further, the flavor violating decays of the top and of the Higgs are also small in MSSM and not observable in current or in near future experiment. In this work, we show that much larger branching ratios for these decays can be achieved in an extended MSSM model with an additional vector-like quark generation. Specifically, we show that in the extended model, one can achieve branching ratios for [Formula: see text] and [Formula: see text] as large as the current experimental upper limits given by the ATLAS and the CMS Collaborations. We also analyze the flavor violating quark decay of the Higgs boson, i.e. [Formula: see text] and [Formula: see text]. Here again, one finds that the branching ratio for these decays can be as large as [Formula: see text]. The analysis is done with inclusion of the CP phases in the Higgs sector, and the effect of CP phases on the branching ratios is investigated. Specifically, the Higgs sector spectrum and mixings are computed involving quarks and mirror quarks, squarks and mirror squarks in the loops consistent with the Higgs boson mass constraint. The resulting effective Lagrangian with inclusion of the vector-like quark generation induce flavor violating decays at the tree level. In the analysis, we also include the experimental constraints from the flavor changing quark decays of the [Formula: see text] boson. The test of the branching ratios predicted could come with further data from LHC13 and such branching ratios could also be accessible at future colliders such as the Higgs factories where the Higgs couplings to fermions will be determined with greater precision.

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