共查询到20条相似文献,搜索用时 0 毫秒
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《Comptes Rendus Physique》2007,8(9):986-998
An introduction is made to the key concepts of gauge invariance and spontaneous symmetry breaking which are the foundations of the Standard Model of particle physics. A new scalar field corresponding to a spin-0 particle, the Higgs boson, is a necessary consequence of this model. Properties of the Higgs boson are constrained; however, its mass is not. Searches using LEP have been both unique, intense, and also efficient: the Standard Model Higgs boson must be heavier than 114 GeV. A hint of a signal was obtained at 115 GeV, but will have to be confirmed (or falsified) by forthcoming experiments at the Tevatron and LHC. To cite this article: M. Davier, C. R. Physique 8 (2007). 相似文献
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We analyse one-loop radiative corrections to the inflationary potential in the theory, where inflation is driven by the Standard Model Higgs field. We show that inflation is possible provided the Higgs mass mH lies in the interval mmin<mH<mmax, where mmin=[136.7+(mt−171.2)×1.95] GeV, mmax=[184.5+(mt−171.2)×0.5] GeV and mt is the mass of the top quark. In the renormalization scheme associated with the Einstein frame the predictions of the spectral index of scalar fluctuations and of the tensor-to-scalar ratio practically do not depend on the Higgs mass within the admitted region and are equal to ns=0.97 and r=0.0034 correspondingly. 相似文献
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We argue that the Higgs boson of the Standard Model can lead to inflation and produce cosmological perturbations in accordance with observations. An essential requirement is the non-minimal coupling of the Higgs scalar field to gravity; no new particle besides already present in the electroweak theory is required. 相似文献
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Jun-Quan Tao M. Aamir Shahzad Si-Jing Zhang Chu Wang Yu-Qiao Shen Guo-Ming Chen He-Sheng Chen S. Gascon-Shotkin M. Lethuillier L. Finco C. Camen 《中国物理C(英文版)》2018,42(10):103107-103107
Following the discovery of the Higgs boson with a mass of approximately 125 Ge V at the LHC, many studies have been performed from both the theoretical and experimental viewpoints to search for a new Higgs Boson that is lighter than 125 Ge V. We explore the possibility of constraining a lighter neutral scalar Higgs boson h_1 and a lighter pseudo-scalar Higgs boson a_1 in the Next-to-Minimal Supersymmetric Standard Model by restricting the next-to-lightest scalar Higgs boson h_2 to be the one observed at the LHC after applying the phenomenological constraints and those from experimental measurements. Such lighter particles are not yet completely excluded by the latest results of the search for a lighter Higgs boson in the diphoton decay channel from LHC data. Our results show that some new constraints on the Next-to-Minimal Supersymmetric Standard Model could be obtained for a lighter scalar Higgs boson at the LHC if such a search is performed by experimental collaborations and more data. The potentials of discovery for other interesting decay channels of such a lighter neutral scalar or pseudo-scalar particle are also discussed. 相似文献
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The OPAL Collaboration G. Abbiendi et al. 《The European Physical Journal C - Particles and Fields》2003,26(4):479-503
This paper summarises the search for the Standard Model Higgs boson in e
+
e
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collisions at centre-of-mass energies up to 209 GeV performed by the OPAL Collaboration at LEP. The consistency of the data
with the background hypothesis and various Higgs boson mass hypotheses is examined. No indication of a signal is found in
the data and a lower bound of 112.7 Gev/c2 is obtained on the mass of the Standard Model Higgs boson at the 95% CL.
Received: 13 March 2002 / Revised version: 9 October 2002 / Published online: 13 December 2002 相似文献
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《Comptes Rendus Physique》2007,8(9):999-1012
We review the realization of the Brout–Englert–Higgs mechanism in the electroweak theory and describe the experimental and theoretical constraints on the mass of the single Higgs boson expected in the minimal Standard Model. We also discuss the couplings of this Higgs boson and its possible decay modes as functions of its unknown mass. We then review the structure of the Higgs sector in the minimal supersymmetric extension of the Standard Model (MSSM), noting the importance of loop corrections to the masses of its five physical Higgs bosons. Finally, we discuss some non-minimal models. To cite this article: J. Ellis et al., C. R. Physique 8 (2007). 相似文献
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We study the feasibility of two experiments to test the existence of the new light Higgs boson (Higglet) h: (1) the observation servation of Higglets produced in high energy proton reactions using the Bethe-Heitler process h + Fe → ?+?? + Fe for detection; (2) the production of Higglets using low energy intensive electron beam with detection using the two photon decay mode. 相似文献
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Gross Eilam Kniehl Bernd A. Wolf Gustavo 《Zeitschrift fur Physik C Particles and Fields》1994,63(3):417-425
We collect and update theoretical predictions for the production rate and decay branching fractions of the Standard Model Higgs boson that will be relevant for the Higgs search at LEP200. We make full use of the present knowledge of radiative corrections. We estimate the systematics arising from theoretical and experimental uncertainties. 相似文献
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《Physics letters. [Part B]》1988,208(2):315-318
It is shown that LEP can set a lower bound on the mass of the lightest supersymmetric Higgs boson (H20) only if both processes Z0→H20μ+μ− and Z0→H20H30 (where H30 is an extra supersymmetric Higgs) are simultaneously considered. 相似文献
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Asai S. Azuelos G. Buttar C. Cavasinni V. Costanzo D. Cranmer K. Harper R. Jakobs K. Kanzaki J. Klute M. Mazini R. Mellado B. Quayle W. Richter-Ws E. Takemoto T. Vivarelli I. Wu Sau Lan 《The European Physical Journal C - Particles and Fields》2003,32(2):s19-s54
The European Physical Journal C - The potential for the discovery of a Standard Model Higgs boson in the mass range m H < 2 m Z in the vector boson fusion mode has been studied for the ATLAS... 相似文献
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The existence of exotic scalars that mix with the Standard Model (SM) Higgs boson can affect Higgs boson phenomenology in a multitude of ways. We consider two light Higgs bosons with shared couplings to SM fields and with masses close to each other, in the range where the h→WW→lνlν is an important search channel. In this channel, we do not find the dilution of significance of the ‘SM-like’ Higgs boson that is naively expected because of the mixing. This is because of leakage of events from the other scalar into its signal region. Nevertheless, we show that the broadening of the h→WW→lνlν significance plots of Standard Model Higgs boson searches could indicate the first evidence of the extra scalar state. 相似文献
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In type III seesaw utilized to explain the observed solar and atmospheric neutrino oscillations the Standard Model (SM) particle spectrum is extended by introducing three SU(2)L triplet fermion fields. This can have important implications for the SM Higgs boson mass (MH) bounds based on vacuum stability and perturbativity arguments. We compute the appropriate renormalization group equations for type III seesaw, and then proceed to identify regions of the parameter space such that the SM Higgs boson mass window is enlarged to 125 GeV?MH?174 GeV, with the type III seesaw scale close to TeV. We also display regions of the parameter space for which the vacuum stability and perturbativity bounds merge together for large neutrino Yukawa couplings. Comparison with type I seesaw is also presented. 相似文献
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Constraints on the parameter space of theMinimal Supersymmetric StandardModel (MSSM) that are imposed by the experimentally observed mass of the Higgs boson (mH = 125 GeV) upon taking into account radiative corrections within an effective theory for the Higgs sector in the decoupling limit are examined. It is also shown that simplified approximations for radiative corrections in theMSSM Higgs sector could reduce, to a rather high degree of precision, the dimensionality of the multidimensionalMSSM parameter space to two. 相似文献