scholarly journals Extra vectorlike matter and the lightest Higgs scalar boson mass in low-energy supersymmetry

2010 ◽  
Vol 81 (3) ◽  
Author(s):  
Stephen P. Martin
Keyword(s):  
Low Energy ◽  
Boson Mass ◽  
Scalar Boson ◽  
Higgs Scalar

scholarly journals The LHC Higgs boson discovery: Implications for Finite Unified Theories

2014 ◽  
Vol 29 (18) ◽  
pp. 1430032 ◽  
Author(s):  
S. Heinemeyer ◽  
M. Mondragón ◽  
G. Zoupanos
Keyword(s):  
Higgs Boson ◽  
Predictive Power ◽  
Low Energy ◽  
Boson Mass ◽  
Higgs Boson Mass ◽  
Light Higgs Boson ◽  
Quark Masses ◽  
Grand Unified Theories ◽  
Unified Theories ◽  
Discovery Potential

Finite Unified Theories (FUTs) are N = 1 supersymmetric Grand Unified Theories (GUTs) which can be made finite to all-loop orders, based on the principle of reduction of couplings, and therefore are provided with a large predictive power. We confront the predictions of an SU(5) FUT with the top and bottom quark masses and other low-energy experimental constraints, resulting in a relatively heavy SUSY spectrum, naturally consistent with the nonobservation of those particles at the LHC. The light Higgs boson mass is automatically predicted in the range compatible with the Higgs discovery at the LHC. Requiring a light Higgs boson mass in the precise range of Mh= 125.6 ±2.1 GeV favors the lower part of the allowed spectrum, resulting in clear predictions for the discovery potential at current and future pp, as well as future e+e-colliders.

scholarly journals Unitarily inequivalent vacua and long-range forces: Phenomenology with scalar boson mass-shift

2020 ◽  
Vol 35 (17) ◽  
pp. 2050139
Author(s):  
Quan Le Thien ◽  
Dennis E. Krause
Keyword(s):  
Long Range ◽  
Vacuum State ◽  
Mass Shift ◽  
Boson Mass ◽  
Exchange Potential ◽  
Beyond The Standard Model ◽  
Scalar Boson ◽  
Boson Exchange ◽  
The One ◽  
The Impact

We explore the impact of a sudden shift in the mass of a scalar boson field on long-range forces mediated by this field under the framework of unitarily inequivalent vacua. Since the search for new long-range forces is an active experimental area probing physics beyond the Standard Model, the consequence of a non-trivial vacuum state of a scalar boson on these experiments is elucidated. We show that while the mass shift affects the one-boson exchange potential, the Casimir force remains only dependent on the vacuum state.

scholarly journals Calculation the production cross-section of the BSM boson via photon fusion reaction

2019 ◽  
pp. 94-97 ◽  
Author(s):  
O. Barabash
Keyword(s):  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Fusion Reaction ◽  
W Bosons ◽  
Boson Mass ◽  
Scalar Boson ◽  
Effective Lagrangian ◽  
Calculated Amplitude ◽  
Charged Leptons

The production cross-section of the beyond the standard model (BSM) scalar boson (S-boson) have been considered it the article. Scalar boson produced via photon fusion reaction in the deep inelastic scattering of a charged particle (proton or electron) on heavy nucleus of the target. This process is one of the possible mecha- nisms of BSM boson production at the SHiP (Search for Hidden Particles) experiment at the CERN LHC and may be dominating among others processes due to large nuclear charge. In a low-energy case for which virtual photon wavelength similar or bigger nuclear size one can consider nucleus as an elementary particle with the charge Z. Corresponding amplitude is proportional to Z and the cross-section proportional to Z^2. Due to this the alpha_{EM}^2 suppression of the production cross-section is approximately compensated by the charge number factor Z^2. The mass of boson cannot exceed 4 MeV for the incident proton (or less than 80 MeV for electron). We calculated amplitude and the production cross-section of this reaction directly without using equivalent photon approximation. Interaction between photon and neutral boson is described by triangular diagrams with the loop containing all charged leptons, quarks and W-bosons. For this interaction we used effective lagrangian. The found cross-section was analyzed for the case of proton scattering on the lead nucleous and compared with the production cross-section in the decay of Ds mesons. It was found that the photon fusion reaction becomes effective only with a S-boson mass less than 0.1 keV.

A DILATON IN TECHNICOLOR

1992 ◽  
Vol 07 (03) ◽  
pp. 201-206
Author(s):  
E. HALYO
Keyword(s):  
Energy Spectrum ◽  
Symmetry Breaking ◽  
Gauge Group ◽  
Goldstone Boson ◽  
Low Energy ◽  
Scalar Boson ◽  
Low Mass ◽  
Pseudo Goldstone Boson ◽  
Rule Out

It is argued that due to spontaneous and anomalous scale symmetry breaking in technicolor there must be a pseudo-Goldstone boson of dilatations in the low energy spectrum of the theory. The technidilaton mass is estimated to be MD≃(7.5/Nr) TeV for a SU (N) TC gauge group with r technifermion doublets. Therefore the existence of a low mass (i.e., MD<1 TeV ) scalar boson will not rule out technicolor.

SUPERSTRING INSPIRED NEUTRAL GAUGE BOSON IN ELASTIC ep-ASYMMETRIES

1989 ◽  
Vol 04 (27) ◽  
pp. 2689-2699 ◽  
Author(s):  
V.A. BEDNYAKOV
Keyword(s):  
Electron Beam ◽  
Elastic Scattering ◽  
Z Boson ◽  
Low Energy ◽  
Boson Mass ◽  
Kinematic Variable ◽  
Accelerator Facility ◽  
Good Opportunity ◽  
Mixing Angle ◽  
The Standard Model

The possible manifestations of the superstring inspired extra Z′-boson in polarized electron and positron elastic scattering on protons was studied. The Z′-boson generated deviations from the Standard Model in asymmetries [Formula: see text] and [Formula: see text] were investigated as functions of the kinematic variable Q2, Z′-boson mass, Z–Z′ mixing angle in the U1η, U1χ and U1ψ low energy superstring models. These deviations vary from fractions of per cent to 20–25%, depending on the above mentioned parameters. We show that precise measurements of these asymmetries (for example, on the Continuous Electron Beam Accelerator Facility) can give a good opportunity to obtain strong restrictions on parameters of superstring E6-models.

scholarly journals LOW ENERGY DATA AND A MODEL OF FLAVOR MIXING

1999 ◽  
Vol 14 (22) ◽  
pp. 1487-1496 ◽  
Author(s):  
EHAB MALKAWI ◽  
C.-P. YUAN
Keyword(s):  
B Mesons ◽  
Low Energy ◽  
Boson Mass ◽  
Energy Data ◽  
The Third ◽  
Quark Sector ◽  
Flavor Changing ◽  
Heavy Gauge Boson ◽  
Flavor Mixing ◽  
Gauge Boson Mass

We consider a model in which the third family fermions are subjected to an SU(2) interaction different from the first two family fermions. Constrained by the Z-pole data, the heavy gauge boson mass is bounded from below to be about 1.7 TeV at the 2σ level. In this model, the flavor mixing between τ and μ can be so large that [Formula: see text] and Br (τ→μμμ) provide a better constraint than the LEP/SLC data in some region of parameter space. Furthermore, flavor-changing neutral currents are unavoidable in the quark sector of the model. Significant effects to the [Formula: see text] mixing and the rare decays of the K and B mesons, such as [Formula: see text], [Formula: see text], Bs→τ+τ-, μ+μ- and Bs,d→μ±τ∓, are expected.

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