Tevatron Higgs mass bounds: Projecting <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi mathvariant="normal">U</mml:mi><mml:msup><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mn>1</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mo>′</mml:mo></mml:msup></mml:math> models to LHC domain

Sert, H.; Cinciog̃lu, Elif; Demir, Durmuş A.; Solmaz, Levent

doi:10.1016/j.physletb.2010.08.007

Cited by 4 publications

(4 citation statements)

References 29 publications

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“…For this reason in addition to the general motivation given in Section 1 -clear-cut combination of Z constraints from quite distinct sources -we adopt a statistical framework wherein it is straightforward to address interference effects and to vary the coupling strength (see also Ref. [54]) up to the strong coupling regime (and broad resonances).…”

Section: The Bayesian Statistical Methodsmentioning

confidence: 99%

Z ′ bosons at colliders: a Bayesian viewpoint

Erler

Langacker

Munir

et al. 2011

J. High Energ. Phys.

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We revisit the CDF data on di-muon production to impose constraints on a large class of Z bosons occurring in a variety of E 6 GUT based models. We analyze the dependence of these limits on various factors contributing to the production crosssection, showing that currently systematic and theoretical uncertainties play a relatively minor role. Driven by this observation, we emphasize the use of the Bayesian statistical method, which allows us to straightforwardly (i) vary the gauge coupling strength, g , of the underlying U (1) ; (ii) include interference effects with the Z amplitude (which are especially important for large g ); (iii) smoothly vary the U (1) charges; (iv) combine these data with the electroweak precision constraints as well as with other observables obtained from colliders such as LEP 2 and the LHC; and (v) find preferred regions in parameter space once an excess is seen. We adopt this method as a complementary approach for a couple of sample models and find limits on the Z mass, generally differing by only a few percent from the corresponding CDF ones when we follow their approach. Another general result is that the interference effects are quite relevant if one aims at discriminating between models. Finally, the Bayesian approach frees us of any ad hoc assumptions about the number of events needed to constitute a signal or exclusion limit for various actual and hypothetical reference energies and luminosities at the Tevatron and the LHC.

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Section: The Bayesian Statistical Methodsmentioning

confidence: 99%

Z ′ bosons at colliders: a Bayesian viewpoint

Erler

Langacker

Munir

et al. 2011

J. High Energ. Phys.

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“…These values are predicted when UMSSM is constrained at the GUT scale, which yield h S 0.7 at most. As is known, if UMSSM is considered at the low energy scale; then, the tree-level Higgs boson mass can be obtained as heavy as about 180 GeV [18].…”

Section: Higgs Boson Mass In Umssmmentioning

confidence: 99%

“…since it is apparent from Eqs. (18,19) that the U (1) breaking scale termed with v S is also the main factor that determines the fine-tuning measure at the electroweak symmetry breaking scale. On the other hand, the fundamental assumption behind the usual definition of ∆ EW is that the fine-tuning measure is determined by the cancellations among the parameters such as µ, m Hu and m H d , which are, in principle, independent of each other, since they exhibit different nature.…”

Section: Notes On Fine-tuningmentioning

confidence: 99%

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Least fine-tuned U(1) extended SSM

et al. 2018

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We consider the Higgs boson mass in a class of the UMSSM models in which the MSSM gauge group is extended by an additional U (1) group. Implementing the universal boundary condition at the GUT scale we target phenomenologically interesting regions of UMSSM where the necessary radiative contributions to the lightest CP-even Higgs boson mass are significantly small and LSP is always the lightest neutralino. We find that the smallest amount of radiative contributions to the Higgs boson mass is about 50 GeV in UMSSM, this result is much lower than that obtained in the MSSM framework, which is around 90 GeV. Additionally, we examine the Higgs boson properties in these models in order to check whether if it can behave similar to the SM Higgs boson under the current experimental constraints. We find that enforcement of smaller radiative contribution mostly restricts the U (1) breaking scale as v S 10 TeV. Besides, such low contributions demand h S ∼ 0.2 − 0.45. Because of the model dependency in realizing these radiative contributions θ E 6 < 0 are more favored, if one seeks for the solutions consistent with the current dark matter constraints. As to the mass spectrum, we find that stop and stau can be degenerate with the LSP neutralino in the range from 300 GeV to 700 GeV; however, the dark matter constraints restrict this scale as mt, mτ 500 GeV. Such degenerate solutions also predict stop-neutralino and stau-neutralino coannihilation channels, which are effective to reduce the relic abundance of neutralino down to the ranges consistent with the current dark matter observations. Finally, we discuss the effects of heavy M Z in the fine-tuning. Even though the radiative contributions are significantly low, the required fine-tuning can still be large. We comment about reinterpretation of the fine-tuning measure in the UMSSM framework, which can yield efficiently low results for the fine-tuning the electroweak scale.1

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