THE ONE-PARAMETER MODEL AT LHC

2011 ◽  
Vol 26 (02) ◽  
pp. 87-100
Author(s):  
JAMES MAXIN ◽  
VAN E. MAYES ◽  
D. V. NANOPOULOS
Keyword(s):  
Large Hadron Collider ◽  
Symmetry Breaking ◽  
Hadron Collider ◽  
Susy Breaking ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Brane Model ◽  
String Compactifications ◽  
The One ◽  
Breaking Scale

No-scale supergravity is a framework where it is possible to naturally explain radiative electroweak symmetry breaking and correlate it with the effective SUSY breaking scale. Many string compactifications have a classical no-scale structure, resulting in a one-parameter model (OPM) for the supersymmetry breaking soft terms, which results in a highly constrained subset of mSUGRA. We investigate the allowed supersymmetry parameter space for a generic one-parameter model taking into account the most recent experimental constraints. We also survey the possible signatures which may be observable at the Large Hadron Collider (LHC). Finally, we compare collider signatures of OPM to those from a model with non-universal soft terms, in particular those of an intersecting D6-brane model.

scholarly journals LANDSCAPE IMPLICATIONS OF EXTENDED HIGGS MODELS

2008 ◽  
Vol 23 (22) ◽  
pp. 3509-3523 ◽  
Author(s):  
L. CLAVELLI
Keyword(s):  
Phase Transition ◽  
Large Hadron Collider ◽  
Standard Model ◽  
Symmetry Breaking ◽  
Hadron Collider ◽  
Higgs Sector ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Degenerate Electron ◽  
Points Of View

From several points of view, it is strongly suggested that the current universe is unstable and will ultimately decay to one that is exactly supersymmetric (SUSY). The possibility that atoms and molecules form in this future universe requires that the degenerate electron/selectron mass is non-zero and hence that electroweak symmetry breaking (EWSB) survives the phase transition to exact SUSY. However, the Minimal Supersymmetric Standard Model (MSSM) and several of its extensions have no EWSB in the SUSY limit. Among the extended Higgs models that have been discussed, one stands out in this regard. The Higgs sector that is revealed at the Large Hadron Collider (LHC) will therefore have implications for the future universe. We also address the question as to whether the transition to the exact SUSY phase with EWSB is exothermic.

TOP QUARK PHYSICS, AN EXPERIMENTAL PERSPECTIVE

2013 ◽  
Vol 28 (18) ◽  
pp. 1330027 ◽  
Author(s):  
EMANUELA BARBERIS
Keyword(s):  
Elementary Particle ◽  
Large Hadron Collider ◽  
Symmetry Breaking ◽  
Top Quark ◽  
Hadron Collider ◽  
Electroweak Symmetry Breaking ◽  
Current Status ◽  
Electroweak Symmetry ◽  
Hadron Colliders ◽  
Physics Program

An experimental review of the current status of the top quark physics program at hadron colliders is presented. Since the discovery of the top quark at the Fermilab Tevatron collider in 1995, its production and the decay have been studied with an extraordinary level of sophistication both at the Tevatron and at the Large Hadron Collider. The top quark is the heaviest known elementary particle, with possible unique connections to the mechanism of electroweak symmetry breaking.

scholarly journals VARIOUS MODELS MIMICKING THE SM HIGGS BOSON

2012 ◽  
Vol 27 (28) ◽  
pp. 1230030 ◽  
Author(s):  
JUNG CHANG ◽  
KINGMAN CHEUNG ◽  
PO-YAN TSENG ◽  
TZU-CHIANG YUAN
Keyword(s):  
Higgs Boson ◽  
Large Hadron Collider ◽  
Symmetry Breaking ◽  
Vector Boson ◽  
Hadron Collider ◽  
Gluon Fusion ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Production Mechanism ◽  
The Standard Model

The new particle around 125 GeV observed at the Large Hadron Collider (LHC) is almost consistent with the standard model (SM) Higgs boson, except that the diphoton decay mode may be excessive. We summarize a number of possibilities. While at the LHC the dominant production mechanism for the Higgs boson of SM and some other extensions is via the gluon fusion process, the alternative vector-boson fusion (VBF) is more sensitive to electroweak symmetry breaking. Using the well-known dijet-tagging technique to single out the VBF mechanism, we investigate potential of VBF to discriminate a number of models suggested to give an enhanced inclusive diphoton production rate.

scholarly journals SEARCHING FOR NEW PHYSICS AT FUTURE ACCELERATORS

2005 ◽  
Vol 20 (22) ◽  
pp. 5184-5192 ◽  
Author(s):  
RICCARDO BARBIERI
Keyword(s):  
Large Hadron Collider ◽  
Symmetry Breaking ◽  
Linear Collider ◽  
Hadron Collider ◽  
New Physics ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
The Status

I overview the status of the Electroweak Symmetry Breaking problem, paying special attention to the possible signals of new physics at the Large Hadron Collider (and at a Linear Collider).

scholarly journals PROSPECTS FOR HIGGS BOSON SEARCHES AT THE LHC

2008 ◽  
Vol 23 (32) ◽  
pp. 5093-5115 ◽  
Author(s):  
KARL JAKOBS ◽  
MARKUS SCHUMACHER
Keyword(s):  
Higgs Boson ◽  
Large Hadron Collider ◽  
Symmetry Breaking ◽  
Hadron Collider ◽  
Mass Range ◽  
Electroweak Symmetry Breaking ◽  
Higgs Bosons ◽  
Standard Model Higgs Boson ◽  
Electroweak Symmetry ◽  
Cern Large Hadron Collider

The investigation of the dynamics responsible for electroweak symmetry breaking is one of the prime tasks of experiments at the CERN Large Hadron Collider (LHC). The experiments ATLAS and CMS have been designed to be able to discover a Standard Model Higgs boson over the full mass range as well as Higgs bosons in extended models. In this paper, the prospects for Higgs boson searches at the LHC are reviewed. In addition, the potential for the measurement of Higgs boson parameters is discussed.

scholarly journals HIGGS–ANTI-DE SITTER SPACETIME BUBBLES FROM SPONTANEOUS Z2-VIOLATION AT ELECTROWEAK SYMMETRY BREAKING SCALE

2004 ◽  
Vol 13 (04) ◽  
pp. 641-657 ◽  
Author(s):  
CIPRIAN DARIESCU
Keyword(s):  
Symmetry Breaking ◽  
Electroweak Symmetry Breaking ◽  
De Sitter Spacetime ◽  
Electroweak Symmetry ◽  
De Sitter ◽  
Frw Universe ◽  
Closed Form Solutions ◽  
Sitter Spacetime ◽  
Friedmann Robertson Walker ◽  
Breaking Scale

The Einstein–Gordon equations for Friedmann–Robertson–Walker (FRW) geometries in feedback reaction with the quartically self-interacting physical field, arisen from the spontaneous Z2-symmetry breaking, are explicitly formulated. The fixed point exact solutions to the "inner parity" non-invariant Einstein–Gordon system (mandatory) describe (k=-1)-FRW manifolds which actually are either Milne or anti-de Sitter Universes. Setting the Z2-invariance breaking scale at one of the electroweak symmetry, we speculate on the cosmological implications of the Higgs–anti-de Sitter bubbles and derive a set of closed-form solutions to the S2-cobordism with a spatially-flat FRW Universe.

scholarly journals ELECTROWEAK SYMMETRY BREAKING AND THE HIGGS BOSON: CONFRONTING THEORIES AT COLLIDERS

2013 ◽  
Vol 28 (02) ◽  
pp. 1330004 ◽  
Author(s):  
ALEKSANDR AZATOV ◽  
JAMISON GALLOWAY
Keyword(s):  
Higgs Boson ◽  
Symmetry Breaking ◽  
Model Building ◽  
Hadron Collider ◽  
Experimental Tests ◽  
New Physics ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Parameter Spaces ◽  
Decay Modes

In this review, we discuss methods of parsing direct information from collider experiments regarding the Higgs boson and describe simple ways in which experimental likelihoods can be consistently reconstructed and interfaced with model predictions in pertinent parameter spaces. We review prevalent scenarios for extending the electroweak symmetry breaking sector and emphasize their predictions for nonstandard Higgs phenomenology that could be observed in large hadron collider (LHC) data if naturalness is realized in particular ways. Specifically we identify how measurements of Higgs couplings can be used to imply the existence of new physics at particular scales within various contexts. The most dominant production and decay modes of the Higgs-like state observed in the early data sets have proven to be consistent with predictions of the Higgs boson of the Standard Model, though interesting directions in subdominant channels still exist and will require our careful attention in further experimental tests. Slightly anomalous rates in certain channels at the early LHC have spurred effort in model building and spectra analyses of particular theories, and we discuss these developments in some detail. Finally, we highlight some parameter spaces of interest in order to give examples of how the data surrounding the new state can most effectively be used to constrain specific models of weak scale physics.

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