scholarly journals A closer study of the framed standard model yielding testable new physics plus a hidden sector with dark matter candidates

2018 ◽  
Vol 33 (33) ◽  
pp. 1850195 ◽  
Author(s):  
José Bordes ◽  
Hong-Mo Chan ◽  
Sheung Tsun Tsou
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Vector Boson ◽  
New Physics ◽  
The Other ◽  
Hidden Sector ◽  
The Standard Model ◽  
Experimental Errors ◽  
Mixing Patterns

This closer study of the FSM (I) retains the earlier results of Ref. 1 in offering explanation for the existence of three fermion generations, as well as the hierarchical mass and mixing patterns of leptons and quarks; (II) predicts a vector boson [Formula: see text] with mass of order TeV which mixes with [Formula: see text] and [Formula: see text] of the standard model. The subsequent deviations from the standard mixing scheme are calculable in terms of the [Formula: see text] mass. While these deviations for (i) [Formula: see text], (ii) [Formula: see text], and (iii) [Formula: see text] are all within present experimental errors so long as [Formula: see text] TeV, they should soon be detectable if the [Formula: see text] mass is not too much bigger; (III) suggests that in parallel to the standard sector familiar to us, there is another where the roles of flavour and colour are interchanged. Though quite as copiously populated and as vibrant in self-interactions as our own, it communicates but little with the standard sector except via mixing through a couple of known portals, one of which is the [Formula: see text] complex noted in (II), and the other is a scalar complex which includes the standard model Higgs. As a result, the new sector appears hidden to us as we appear hidden to them, and so its lowest members with masses of order 10 MeV, being electrically neutral and seemingly stable, but abundant, may make eligible candidates as constituents of dark matter. A more detailed summary of these results together with some remarks on the model’s special theoretical features can be found in the last section of this paper.

scholarly journals The Z boson in the framed standard model

2018 ◽  
Vol 33 (32) ◽  
pp. 1850190 ◽  
Author(s):  
José Bordes ◽  
Hong-Mo Chan ◽  
Sheung Tsun Tsou
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Z Boson ◽  
Unknown Parameter ◽  
Vector Boson ◽  
Great Accuracy ◽  
Experimental Accuracy ◽  
Hidden Sector ◽  
The Standard Model ◽  
Mixing Patterns

The framed standard model (FSM), constructed initially for explaining the existence of three fermion generations and the hierarchical mass and mixing patterns of quarks and leptons,[Formula: see text] suggests also a “hidden sector” of particles3 including some dark matter candidates. It predicts in addition a new vector boson [Formula: see text], with mass of order TeV, which mixes with the [Formula: see text] and [Formula: see text] of the standard model yielding deviations from the standard mixing scheme, all calculable in terms of a single unknown parameter [Formula: see text]. Given that standard mixing has been tested already to great accuracy by experiment, this could lead to contradictions, but it is shown here that for the three crucial and testable cases so far studied (i) [Formula: see text], (ii) [Formula: see text], (iii) [Formula: see text]), the deviations are all within the present stringent experimental bounds provided [Formula: see text] TeV, but should soon be detectable if experimental accuracy improves. This comes about because of some subtle cancellations, which might have a deeper reason that is not yet understood. By virtue of mixing, [Formula: see text] can be produced at the LHC and appear as a [Formula: see text] anomaly. If found, it will be of interest not only for its own sake but serve also as a window on to the “hidden sector” into which it will mostly decay, with dark matter candidates as most likely products.

scholarly journals Generation patterns, modified γ − Z mixing, and hidden sector with dark matter candidates as framed standard model results

2018 ◽  
Vol 33 (36) ◽  
pp. 1830034 ◽  
Author(s):  
José Bordes ◽  
Hong-Mo Chan ◽  
Sheung Tsun Tsou
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Vector Boson ◽  
Higgs Field ◽  
Geometric Meaning ◽  
Experimental Accuracy ◽  
Hidden Sector ◽  
Experimental Errors ◽  
Mixing Patterns ◽  
Opening Up

A descriptive summary is given of the results to-date from the framed standard model (FSM) which: Assigns geometric meaning to the Higgs field and to fermion generations, hence offering an explanation for the observed mass and mixing patterns of quarks and leptons, reproducing near-quantitatively 17 of SM parameters with only 7. Predicts a new vector boson [Formula: see text] which mixes with [Formula: see text] and [Formula: see text], leading to deviations from the SM mixing scheme. For [Formula: see text] TeV, these deviations are within present experimental errors but should soon be detectable at LHC when experimental accuracy is further improved. Suggests the existence of a hidden sector of particles as yet unknown to experiment which interact but little with the known particles. The lowest members of the hidden sector of mass around 17 MeV, being electrically neutral and stable, may figure as dark matter constituents. The idea is to retrace the steps leading to the above results unencumbered by details already worked out and reported elsewhere. This has helped to clarify the logic, tighten some arguments and dispense with one major assumption previously thought necessary, thus strengthening earlier results in opening up possibly a new and exciting vista for further exploration.

scholarly journals PREDICTED SIGNATURES AT THE LHC FROM U(1) EXTENSIONS OF THE STANDARD MODEL

2010 ◽  
Vol 25 (36) ◽  
pp. 3003-3016 ◽  
Author(s):  
PRAN NATH
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Vector Boson ◽  
Hadron Collider ◽  
Mass Growth ◽  
Hidden Sector ◽  
Quantum Numbers ◽  
The Standard Model ◽  
Vector Bosons

We discuss the U (1)X extensions of the standard model with focus on the Stueckelberg mechanism for mass growth for the extra U (1)X gauge boson. The assumption of an axionic connector field which carries dual U(1) quantum numbers, i.e. quantum numbers for the hypercharge U(1) Y and for the hidden sector gauge group U (1)X, allows a nontrivial mixing between the mass growth for the neutral gauge vector bosons in the SU(2) L × U (1)Y sector and the mass growth for the vector boson by the Stueckelberg mechanism in the U (1)X sector. This results in an extra Z′ which can be very narrow, but still detectable at the Large Hadron Collider (LHC). The U (1)X extension of the minimal supersymmetric standard model is also considered and the role of the Fayet–Illiopoulos term in such an extension discussed. The U (1)X extensions of the SM and of the MSSM lead to new candidates for dark matter.

scholarly journals R-PARITY VIOLATING U(1)′-EXTENDED SUPERSYMMETRIC STANDARD MODEL

2008 ◽  
Vol 23 (39) ◽  
pp. 3271-3283 ◽  
Author(s):  
HYE-SUNG LEE
Keyword(s):  
Dark Matter ◽  
Gauge Symmetry ◽  
Standard Model ◽  
Supersymmetric Standard Model ◽  
Discrete Symmetries ◽  
Discrete Symmetry ◽  
New Physics ◽  
Dark Matter Candidate ◽  
Hidden Sector

Supersymmetry is one of the best motivated new physics scenarios. To build a realistic supersymmetric standard model, however, a companion symmetry is necessary to address various issues. While R-parity is a popular candidate that can address the proton and dark matter issues simultaneously, it is not the only option for such a property. We review how a TeV scale U(1)′ gauge symmetry can replace the R-parity. Discrete symmetries of the U(1)′ can make the model still viable and attractive with distinguishable phenomenology. For instance, with a residual discrete symmetry of the U(1)′, Z6 = B3 × U2, the proton can be protected by the baryon triality (B3) and a hidden sector dark matter candidate can be protected by the U-parity (U2).

scholarly journals A global view of the off-shell Higgs portal

2020 ◽  
Vol 8 (2) ◽  
Author(s):  
Maximilian Ruhdorfer ◽  
Ennio Salvioni ◽  
Andreas Weiler
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Vector Boson ◽  
Effective Interaction ◽  
Goldstone Boson ◽  
High Energy ◽  
Beyond The Standard Model ◽  
The Standard Model ◽  
Higgs Portal ◽  
First Time

We study for the first time the collider reach on the derivative Higgs portal, the leading effective interaction that couples a pseudo Nambu-Goldstone boson (pNGB) scalar Dark Matter to the Standard Model. We focus on Dark Matter pair production through an off-shell Higgs boson, which is analyzed in the vector boson fusion channel. A variety of future high-energy lepton colliders as well as hadron colliders are considered, including CLIC, a muon collider, the High-Luminosity and High-Energy versions of the LHC, and FCC-hh. Implications on the parameter space of pNGB Dark Matter are discussed. In addition, we give improved and extended results for the collider reach on the marginal Higgs portal, under the assumption that the new scalars escape the detector, as motivated by a variety of beyond the Standard Model scenarios.

scholarly journals Electroweak symmetry non-restoration from dark matter

2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
Oleksii Matsedonskyi ◽  
James Unwin ◽  
Qingyun Wang
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Higgs Mass ◽  
Direct Detection ◽  
Higgs Doublet ◽  
New Physics ◽  
Electroweak Symmetry ◽  
The Standard Model ◽  
New States ◽  
Potential Remedy

Abstract Restoration of the electroweak symmetry at temperatures around the Higgs mass is linked to tight phenomenological constraints on many baryogenesis scenarios. A potential remedy can be found in mechanisms of electroweak symmetry non-restoration (SNR), in which symmetry breaking is extended to higher temperatures due to new states with couplings to the Standard Model. Here we show that, in the presence of a second Higgs doublet, SNR can be realized with only a handful of new fermions which can be identified as viable dark matter candidates consistent with all current observational constraints. The competing requirements on this class of models allow for SNR at temperatures up to ∼TeV, and imply the presence of sub-TeV new physics with sizable interactions with the Standard Model. As a result this scenario is highly testable with signals in reach of next-generation collider and dark matter direct detection experiments.

scholarly journals A Heavy Scalar at the LHC from Vector-Boson Fusion

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Qiurong Mou ◽  
Sibo Zheng
Keyword(s):  
Standard Model ◽  
Vector Boson ◽  
Mass Range ◽  
New Physics ◽  
Vector Boson Fusion ◽  
Mixing Angle ◽  
The Standard Model ◽  
Scalar Mass ◽  
Event Simulations ◽  
Integrated Luminosity

A hypothetical scalar mixed with the standard model Higgs appears in few contexts of new physics. This study addresses the question what mass range is in the reach of 14 TeV LHC given different magnitudes of mixing angle α, where event simulations are based on production from vector-boson fusion channel and decays into SM leptons through WW or ZZ. It indicates that heavy scalar mass up to 539 GeV and 937 GeV can be excluded by integrated luminosity of 300 fb-1 and 3000 fb-1, respectively, for sin2α larger than 0.04.

scholarly journals REDUCING PENGUIN POLLUTION

2013 ◽  
Vol 28 (15) ◽  
pp. 1350063 ◽  
Author(s):  
BHUBANJYOTI BHATTACHARYA ◽  
ALAKABHA DATTA ◽  
DAVID LONDON
Keyword(s):  
Standard Model ◽  
New Physics ◽  
Electroweak Penguin ◽  
Theoretical Error ◽  
Angular Analysis ◽  
The Standard Model ◽  
Tree Diagram ◽  
Experimental Errors ◽  
Exact Size

The most common decay used for measuring 2βs, the phase of [Formula: see text] mixing, is [Formula: see text]. This decay is dominated by the color-suppressed tree diagram, but there are other contributions due to gluonic and electroweak penguin diagrams. These are often referred to as "penguin pollution" (PP) because their inclusion in the amplitude leads to a theoretical error in the extraction of 2βsfrom the data. In the standard model (SM), it is estimated that the PP is negligible, but there is some uncertainty as to its exact size. Now, [Formula: see text] (the measured value of 2βs) is small, in agreement with the SM, but still has significant experimental errors. When these are reduced, if one hopes to be able to see clear evidence of new physics (NP), it is crucial to have the theoretical error under control. In this paper, we show that, using a modification of the angular analysis currently used to measure [Formula: see text] in [Formula: see text], one can reduce the theoretical error due to PP. Theoretical input is still required, but it is much more modest than entirely neglecting the PP. If [Formula: see text] differs from the SM prediction, this points to NP in the mixing. There is also enough information to test for NP in the decay. This method can be applied to all [Formula: see text] decays.

scholarly journals BOSONIC SEESAW AND A SOLUTION TO THE μ PROBLEM IN THE UNPARTICLE PHYSICS

2010 ◽  
Vol 25 (09) ◽  
pp. 691-701
Author(s):  
TATSURU KIKUCHI
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Symmetry Breaking ◽  
Conformal Symmetry ◽  
New Physics ◽  
Electroweak Symmetry Breaking ◽  
Effective Theory ◽  
Electroweak Symmetry ◽  
Hidden Sector ◽  
The Standard Model

Recently, conceptually new physics beyond the Standard Model has been proposed by Georgi, where a new physics sector becomes conformal and provides "unparticle" which couples to the Standard Model sector through higher dimensional operators in low energy effective theory. Among several possibilities, we focus on operators involving the unparticle and Higgs boson. Once the Higgs develops the vacuum expectation value (VEV), the conformal symmetry is broken and as a result, the mixing between the unparticle and the Higgs boson emerges. In the former part of this paper, we consider a natural realization of bosonic seesaw in the context of unparticle physics. In this framework, the negative mass squared or the electroweak symmetry breaking vacuum is achieved as a result of mass matrix diagonalization. So, the bosonic seesaw mechanism for the electroweak symmetry breaking can naturally be understood in the framework of unparticle physics. In the latter part of this paper, we consider the unparticle as a hidden sector of supersymmetry breaking, and give some phenomenological consequences of this scenario. The result shows that there is a possibility for the unparticle as a hidden sector in SUSY breaking sector, and can provide a solution to the μ problem in SUSY models.

ASTROPARTICLE PHYSICS

2007 ◽  
Vol 22 (30) ◽  
pp. 5550-5560
Author(s):  
A. BETTINI
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Experimental Evidence ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Astroparticle Physics ◽  
The Standard Model ◽  
New Particles

Astroparticle is a very wide, expanding, sector of Physics; this report covers only a fraction of it complementing the plenary reports of Y. Takahashi and K. Inoue. I will focus, in particular, on the experimental evidence of new physics, beyond the Standard Model. Astroparticle and accelerator experiments will give complementary tools in the search of new particles, like those of the dark matter, and new fundamental fields, like the inflaton.

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