Evading Z′ boson mass limits in U(1)′ supersymmetric models

2020 ◽  
Vol 229 (21) ◽  
pp. 3205-3220
Author(s):  
Mariana Frank
Keyword(s):  
Z Boson ◽  
Boson Mass ◽  
Supersymmetric Models

NUMERICAL ANALYSIS OF GUTs PREDICTIONS IN THE LIGHT OF RECENT RESULTS FROM LEP

1992 ◽  
Vol 07 (35) ◽  
pp. 3319-3330
Author(s):  
DARIUSZ GRECH
Keyword(s):  
Z Boson ◽  
Electromagnetic Coupling ◽  
Boson Mass ◽  
Threshold Effects ◽  
Coupling Constant ◽  
Central Values ◽  
Unified Theories ◽  
Proton Lifetime ◽  
Experimental Values ◽  
Best Fit

We find numerical best fit for sin 2 Θw(MZ), unifying mass MX and the proton lifetime τp as the outcome of analysis where experimental values of Z boson mass MZ, strong coupling constant αs(MZ) and electromagnetic coupling α0(MZ) are taken as the only input parameters. It is found that simple nonsupersymmetric models are unlikely to be realistic ones. On the other hand, we find the best numerical fit: sin 2Θw(MZ = 0.2330 ± 0.0007 (theor.) ± 0.0027 (exp.) , [Formula: see text] yr for supersymmetric unified theories with three generations. The central values require, however, that the supersymmetric mass Λs≲300 GeV . Possibilities of increasing this limit as well as cases with four generations and threshold effects are also discussed. Compact formulas for theoretical and experimental uncertainties involved in the analysis are also produced.

CANCELLATION OF ULTRAVIOLET DIVERGENCES IN THE SU(2)L×U(1) ELECTROWEAK MODEL

1989 ◽  
Vol 04 (28) ◽  
pp. 2733-2738 ◽  
Author(s):  
ROGER DECKER ◽  
JEAN PESTIEAU
Keyword(s):  
Top Quark ◽  
Z Boson ◽  
Charged Lepton ◽  
W Boson ◽  
Boson Mass ◽  
Three Generations ◽  
Electroweak Model

We assume that, in the SU(2)L×U(1) model, ultraviolet divergences of the charged lepton self-masses are zero. We predict the top and Higgs masses in the vicinity of the Z-boson mass. Our assumption holds only if there are no more than three generations of quarks and leptons and if quarks and leptons, except for the top quark, have negligible masses compared to the W-boson mass.

scholarly journals Electroweak measurements from W, Z and photon final states

2014 ◽  
Vol 31 ◽  
pp. 1460276
Author(s):  
Hang Yin ◽  
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Z Boson ◽  
W Boson ◽  
Charge Asymmetry ◽  
Distribution Functions ◽  
Boson Mass ◽  
Electroweak Theory ◽  
Final States ◽  
Parton Distribution Functions

We present the most recent precision electroweak measurements of single W and Z boson cross section and properties from the LHC and Tevatron colliders, analyzing data collected by ATLAS, CDF, CMS, D0, and LHCb detectors. The results include the measurement of the single W and Z boson cross section at LHC, the differential cross section measurements, the measurement of W boson mass, the measurement of W and Z charge asymmetry. These measurements provide precision tests on the electroweak theory, high order predictions and the information can be used to constraint parton distribution functions.

scholarly journals Measurement of the Z-boson mass using e+e−→Zγ events at centre-of-mass energies above the Z pole

2004 ◽  
Vol 585 (1-2) ◽  
pp. 42-52 ◽  
Author(s):  
P. Achard ◽  
O. Adriani ◽  
M. Aguilar-Benitez ◽  
J. Alcaraz ◽  
G. Alemanni ◽  
...  
Keyword(s):  
Z Boson ◽  
Boson Mass ◽  
Centre Of Mass

scholarly journals UNUSUAL HIGGS OR SUPERSYMMETRY FROM NATURAL ELECTROWEAK SYMMETRY BREAKING

2009 ◽  
Vol 24 (21) ◽  
pp. 1631-1648 ◽  
Author(s):  
RADOVAN DERMÍŠEK
Keyword(s):  
Higgs Boson ◽  
Symmetry Breaking ◽  
Electroweak Symmetry Breaking ◽  
Fine Tuning ◽  
Boson Mass ◽  
Higgs Boson Mass ◽  
Electroweak Symmetry ◽  
Supersymmetric Models ◽  
Soft Supersymmetry Breaking ◽  
Search Limit

This review provides an elementary discussion of electroweak symmetry breaking in the minimal and the next-to-minimal supersymmetric models with the focus on the fine-tuning problem — the tension between natural electroweak symmetry breaking and the direct search limit on the Higgs boson mass. Two generic solutions of the fine-tuning problem are discussed in detail: models with unusual Higgs decays; and models with unusual pattern of soft supersymmetry breaking parameters.

scholarly journals Review of physics results from the Tevatron: Electroweak physics

2015 ◽  
Vol 30 (06) ◽  
pp. 1541004 ◽  
Author(s):  
Ashutosh V. Kotwal ◽  
Heidi Schellman ◽  
Jadranka Sekaric
Keyword(s):  
Z Boson ◽  
W Boson ◽  
Mass Measurement ◽  
New Physics ◽  
Boson Mass ◽  
Precision Measurements ◽  
Boson Production ◽  
Physics Program ◽  
Electroweak Sector ◽  
Electroweak Physics

We summarize an extensive Tevatron (1984–2011) electroweak physics program that involves a variety of W and Z boson precision measurements. The relevance of these studies using single and associated gauge boson production to our understanding of the electroweak sector, quantum chromodynamics and searches for new physics is emphasized. We discuss the importance of the W boson mass measurement, the W/Z boson distributions and asymmetries, and diboson studies. We highlight the recent Tevatron measurements and prospects for the final Tevatron measurements.

scholarly journals Is the magnitude of the Peccei–Quinn scale set by the landscape?

2019 ◽  
Vol 79 (11) ◽  
Author(s):  
Howard Baer ◽  
Vernon Barger ◽  
Dibyashree Sengupta ◽  
Hasan Serce ◽  
Kuver Sinha ◽  
...  
Keyword(s):  
Dark Matter ◽  
Susy Breaking ◽  
Electroweak Symmetry Breaking ◽  
Boson Mass ◽  
Global Symmetry ◽  
Higgs Boson Mass ◽  
Electroweak Symmetry ◽  
Misalignment Angle ◽  
Intermediate Scale ◽  
Supersymmetric Models

Abstract The value of the Higgs boson mass plus the lack of signal at LHC13 has led to a naturalness crisis for supersymmetric models. In contrast, rather general considerations of the string theory landscape imply a mild statistical draw towards large soft SUSY breaking terms tempered by the requirement of proper electroweak symmetry breaking where SUSY contributions to the weak scale are not too far from $$m_{weak}\sim 100$$mweak∼100 GeV. Such a picture leads to the prediction that $$m_h\simeq 125$$mh≃125 GeV while most sparticles are beyond current LHC reach. Here we explore the possibility that the magnitude of the Peccei–Quinn (PQ) scale $$f_a$$fa is also set by string landscape considerations within the framework of a compelling SUSY axion model. First, we examine the case where the PQ symmetry arises as an accidental approximate global symmetry from a more fundamental gravity-safe $$\mathbb {Z}_{24}^R$$Z24R symmetry and where the SUSY $$\mu $$μ parameter arises from a Kim-Nilles operator. The pull towards large soft terms then also pulls the PQ scale as large as possible. Unless this is tempered by rather severe (unknown) cosmological or anthropic bounds on the density of dark matter, then we would expect a far greater abundance of dark matter than is observed. This conclusion cannot be negated by adopting a tiny axion misalignment angle $$\theta _i$$θi because WIMPs are also overproduced at large $$f_a$$fa. Hence, we conclude that setting the PQ scale via anthropics is highly unlikely. Instead, requiring soft SUSY breaking terms of order the gravity-mediation scale $$m_{3/2}\sim 10$$m3/2∼10–100 TeV places the mixed axion–neutralino dark matter abundance into the intermediate scale sweet zone where $$f_a\sim 10^{11}$$fa∼1011–$$10^{12}$$1012 GeV. We compare our analysis to the more general case of a generic SUSY DFSZ axion model with uniform selection on $$\theta _i$$θi but leading to the measured dark matter abundance: this approach leads to a preference for $$f_a\sim 10^{12}$$fa∼1012 GeV.

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