On physics beyond standard model

Hu, Yang; Wang, You-Kai; Yin, Peng-Fei; Zhu, Shou-hua

doi:10.1007/s11467-013-0382-0

Cited by 7 publications

(8 citation statements)

References 171 publications

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“…Theoretically, in some BSM models there exists a light scalar naturally. For example, (1) in the minimal supersymmetric model, the lightest Higgs boson should be lighter than 140 GeV including higher-order corrections [22] (at tree level it should be lighter than the mass of Z 0 boson); (2) in the little Higgs model, a Higgs boson that is treated as a pseudo-Nambu-Goldstone boson must be light due to classical global symmetry and it acquires mass through quantum effects only [23]; (3) similarly, anomalies in scale invariance can also generate a light Higgs boson as well [24]; and (4) the lightness of Higgs boson can intimately connect with the spontaneous CP violation [25]. While the first three approaches are based on the conjectured symmetry, the last one utilizes the observed approximate CP symmetry.…”

Section: B the Issue Of Lightness Of New Scalar Boson In The Sm And Bsmmentioning

confidence: 99%

“…Cheng and Sher proposed an ansatz [43] that the flavor-changing couplings should be ∝ ffiffiffiffiffiffiffiffiffiffi ffi m i m j p for two fermions with mass m i and m j . One of the authors of this paper had proposed a mechanism [25] to understand the lightness of Higgs boson in the ξ → 0 limit. In this paper, we will explore the relation between the smallness of CP violation and the lightness of Higgs boson in a similar way as the Lee model further.…”

Section: The Lightness Of New Scalar Boson and Spontaneous Cp Violmentioning

confidence: 99%

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Lightness of Higgs boson and spontaneousCPviolation in the Lee model

Mao

Zhu

2014

Phys. Rev. D

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We proposed a mechanism in which the lightness of Higgs boson and the smallness of charge parity (CP) violation are correlated based on the Lee model, namely, the spontaneous CP-violation two-Higgsdoublet model. In this model, the mass of the lightest Higgs boson m h as well as the quantities K and J are ∝ t β s ξ in the limit t β s ξ → 0 (see text for definitions of t β and ξ), namely, the CP conservation limit. Here, K and J are the measures for CP-violation effects in scalar and Yukawa sectors, respectively. It is a new way to understand why the Higgs boson discovered at the LHC is light. We investigated the important constraints from both high energy LHC data and numerous low energy experiments, especially the measurements of electric dipole moments of electron and neutron as well as the quantities of B meson and kaon. Confronting all data, we found that this model is still viable. It should be emphasized that there is no standard-model limit for this scenario; thus it is always testable for future experiments. In order to pin down the Lee model, it is important to discover the extra neutral and charged Higgs bosons and measure their CP properties and the flavor-changing decays. At the LHC with ffiffi ffi s p ¼ 14 TeV, this scenario is favored if there is significant suppression in the bb decay channel or any vector boson fusion, V þ H production channels. On the contrary, it will be disfavored if the signal strengths are standard-model-like more and more. It can be easily excluded at ð3-5Þσ level with several fb −1 at future e þ e − colliders, via accurately measuring the Higgs boson production cross sections.

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Section: B the Issue Of Lightness Of New Scalar Boson In The Sm And Bsmmentioning

confidence: 99%

Section: The Lightness Of New Scalar Boson and Spontaneous Cp Violmentioning

confidence: 99%

Lightness of Higgs boson and spontaneousCPviolation in the Lee model

Mao

Zhu

2014

Phys. Rev. D

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“…After symmetry breaking for the CP conserving case, there are five physical Higgs: two CPeven Higgs bosons (h 0 , H 0 ), one CP-odd Higgs boson (A 0 ) and two charged Higgs bosons (H ± ). In general, there are just six parameters in Higgs sector: Recently we found that CP spontaneous breaking seems intimately connected to the lightness of Higgs boson [3,4]. The phenomenology of this model is similar to the popular 2HDM.…”

Section: Extra Higgs Boson In Bsm Modelsmentioning

confidence: 93%

On extra neutral and charged Higgs bosons at the LHC

Wang

Zhu

2014

Chin. Sci. Bull.

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The properties of 125 GeV new particle, which was discovered in 2012 at the Large Hadron Collider (LHC), are found to be consistent with those of the Higgs boson in the standard model (SM). Hereafter the new particle is dubbed as SM-like Higgs boson. However there is still spacious room for physics beyond the SM (BSM) due to the limited energy and luminosity of the LHC. With more data, experiments will scrutinize whether the new particle is indeed the SM one or not. At the same time, one believes that discovery of the SM-like Higgs boson is just the start of the new era of particle physics. The predominant topic is whether there are others new Higgs bosons as speculated in various BSM models. In this short review we will describe the current status of Higgs physics at the LHC and several BSM models which contain more Higgs sectors. In literature there are numerous studies on extended Higgs sector and a comprehensive review is beyond the scope of this review.Instead, we will present two latest studies on Higgs physics: (1) how to detect the charged Higgs boson and measure tan β after including the top polarization information, and (2) how to discover the extra neutral Higgs boson via the pair production of SM-like Higgs boson.

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“…1. This conjectured new paradigm is based on the assumption that correlation between the lightness of H(125) and the smallness of CP-arXiv:1410.4310v1 [hep-ph] 16 Oct 2014 violation under the framework of spontaneous CP violation (SCPV) [2,3,4]. The SCPV was firstly proposed by T.D.…”

Section: Motivation For Charged Higgs Boson: a Possible New Paradigmmentioning

confidence: 99%