共查询到20条相似文献,搜索用时 15 毫秒
1.
The next-to-minimal supersymmetric standard model(NMSSM)more naturally accommodates a Higgs boson with a mass of approximately 125 Ge V than the minimal supersymmetric standard model(MSSM).In this work,we assume that the next-to-lightest CP-even Higgs boson h2 is the SM-like Higgs boson h,whereas the lightest CP-even Higgs boson h_(1)is dominantly singlet-like.We discuss the h_1h_1,h_2h_2,and h_1h_(2)pair production processes via gluon-gluon fusion at the LHC for an collision energy of 14 Te V,and we consider the cases in which one Higgsboson decays to bˉb and the other decays toγγorτ~+τ~-.We find that,for m_(h1) 62 GeV,the cross section of the gg→h_1h_(1)process is relatively large and maximally reaches 5400 fb,and the production rate of the h_1h_1→bˉbτ~+τ~-final state can reach 1500 fb,which make the detection of this final state possible for future searches of an integrated luminosity of 300 and 3000 fb~(-1).This is mainly due to the contributions from the resonant production process pp→h_2→h_1h_(1)and the relatively large branching ratio of h_1→bb and h_1→τ~+τ~-.The cross sections of the pp→h_2h_2and pp→h_1h_2 production processes maximally reach 28 fb and 133 fb,respectively. 相似文献
2.
We investigate the one-loop contributions to the mass of the SM-like Higgs boson in the MSSM considering the effect of slepton flavor mixing, which is parametrized by the dimensionless parameter δXY(X, Y = L, R) in the slepton mass matrices. For the surviving samples under the experimental constraints, we calculate the corrections to the mass of the SM-like Higgs boson in terms of δXY. We find that the mass correction ?mhcan even be larger than 10 GeV for large δRLor δLR. Moreover, ?mhhas strong sensitivity to δRLor δLR, while the weak sensitivity to δLLor δRR, sinceδRLor δLRenters directly into the coupling of Higgs boson with sleptons in the calculations of Higgs boson self-energies. 相似文献
3.
We investigate the one-loop contributions to the mass of the SM-like Higgs boson in the MSSM considering the effect of slepton flavor mixing, which is parametrized by the dimensionless parameter δXY (X,Y=L,R) in the slepton mass matrices. For the surviving samples under the experimental constraints, we calculate the corrections to the mass of the SM-like Higgs boson in terms of δXY. We find that the mass correction Δmh can even be larger than 10 GeV for large δRL or δLR. Moreover, Δmh has strong sensitivity to δRL or δLR, while the weak sensitivity to δLL or δRR, since δRL or δLR enters directly into the coupling of Higgs boson with sleptons in the calculations of Higgs boson self-energies. 相似文献
4.
The CP-violating effects to the subprocess gg → H H- are studied in the mSUGRA scenario at the CERN large hadron collider, by taking into account the experimental bounds of electron and neutron electric dipole moments.The CP-violating effects in this process are related to the complex phases ofμ and Af in the mSUGRA scenario. In our calculation we consider smallCP phases ofμ and Af and neglect the effects of neutral Higgs boson mixing. In this case the CP effects to the process mainly come from the complex couplings of Higgs-squark-squark. We find a strong dependence of charged Higgs boson pair production rate on the complex couplings in the parameter space of minimal supersymmetric standard model`` 相似文献
5.
The CP-violating effects to the subprocess gg→H+H- are studied in the mSUGRA scenario at the CERN large hadron collider, by taking into account the
experimental bounds of electron and neutron electric dipole moments.
The CP-violating effects in this process are related to the complex phases of μ and Af in
the mSUGRA scenario. In our calculation we consider small CP phases of
μ and Af and neglect the effects of neutral Higgs boson mixing.
In this case the CP effects to the process mainly come from the complex
couplings of Higgs-squark-squark. We find a strong dependence of
charged Higgs boson pair production rate on the complex couplings
in the parameter space of minimal supersymmetric standard model. 相似文献
6.
Kajari Mazumdar 《Pramana》2007,69(5):801-807
The principal physics motivation of the LHC experiments is to search for the Higgs boson and to probe the physics of TeV energy
scale. Potential of discovery for Higgs bosons in various scenarios beyond standard model have been estimated for both CMS
and ATLAS experiments through detailed detector simulations. Main results from the recently published studies of CMS collaboration
are only included in this write-up.
on behalf of the ATLAS and CMS Collaborations 相似文献
7.
Considering the process pp → VH+X(V = W or Z) is a significant channel for searching for a light Higgs boson,we calculate the contributions of the littlest Higgs model with T-parity(called LHT model) to its production cross section.We find that,in most of the parameter space,the value of the relative correction parameter R is very small.However,with reasonable values of the free parameters,its value can be significantly larger. 相似文献
8.
Considering the process pp→VH +X(V = W or Z) is a significant channel for searching for a light Higgs boson, we calculate the contributions of the littlest Higgs model with T-parity (called LHT model) to its production cross section. We find that, in most of the parameter space, the value of the relative correction parameter R is very small. However, with reasonable values of the free parameters, its value can be significantly larger. 相似文献
9.
计划中的高能量、高亮度对撞机ILC在寻找新物理模型所预言的新的重粒子方面具有很大的潜力。本文,我们研究了在ILC上,通过过程e^+e^- ->r(Z)B_H发现littlest Higgs模型中最轻的新规范玻色子B_H的可能性。结果显示,在较大的参数空间范围,这两个过程都有较大的产生截面,能产生足够的信号探测B_H,尤其是对过程e^+e^- ->rB_H。另外,B_H的一些衰变道可以产生特征比较明显背景比较干净的信号。如果B_H存在,随着ILC的运行,新的规范玻色子B_H应能通过这两过程观测。 相似文献
10.
Eri Asakawa 《Pramana》2007,69(5):927-930
We study resonant effects of heavy Higgs bosons on the top-pair production process at a photon linear collider. Observables
which can be obtained by circular polarization of colliding photons and polarization measurement through the angular distribution
of the top quark decays are useful not only for measuring the Higgs CP parity but also for resolving degeneracy of Higgs bosons.
相似文献
11.
The minimal supersymmetric extension of the standard model (MSSM) predicts the existence of new charged and neutral Higgs
bosons. The pair creation of these new particles at the multi-TeV e
+
e
− compact linear collider (CLIC), followed by decays into standard model particles, were simulated along with the corresponding
background. High-energy beam-beam effects such as ISR, beamstrahlung and hadronic background were included. We have investigated
the possibility of using the ratio between the number of events found in various decay channels to determine the MSSM parameter
tan β and we have derived the corresponding statistical error from the uncertainties on the measured cross-sections and Higgs boson
masses.
相似文献
12.
The minimal supersymmetric extension of the standard model (MSSM) predicts the existence of new charged and neutral Higgs
bosons. The pair creation of these new particles at the multi-TeV e
+
e
− compact linear collider (CLIC), followed by decays into standard model particles, were simulated along with the corresponding
background. High-energy beam-beam effects such as ISR, beamstrahlung and hadronic background were included. We have investigated
the possibility of using the ratio between the number of events found in various decay channels to determine the MSSM parameter
tan β and we have derived the corresponding statistical error from the uncertainties on the measured cross-sections and Higgs boson
masses.
相似文献
13.
Ian G. Moss 《Contemporary Physics》2013,54(4):468-476
The discovery of the Standard Model Higgs boson opens up a range of speculative cosmological scenarios, from the formation of structure in the early universe immediately after the big bang, to relics from the electroweak phase transition one nanosecond after the big bang, on to the end of the present-day universe through vacuum decay. Higgs physics is wide ranging, and gives an impetus to go beyond the Standard Models of particle physics and cosmology to explore the physics of ultra-high energies and quantum gravity. 相似文献
14.
P. Igo-Kemenes 《Pramana》2004,62(3):555-560
During the twelve years of operation of thee
+
e
− collider LEP, the associated collaborations, ALEPH, DELPHI, L3 and OPAL, have extensively searched for Higgs bosons over
a broad range of masses. We present the final results from LEP for the standard model Higgs boson which are obtained from
a statistical combination of the data from the four experiments. We also present preliminary combined results for neutral
Higgs bosons in the minimal supersymmetric model (MSSM) where the Higgs sector is assumed to be CP invariant. Finally, we
discuss an alternative MSSM scenario including CP violation in the Higgs sector. 相似文献
15.
One of the future goals of the LHC is to precisely measure the properties of the Higgs boson. The associated production of a Higgs boson and top quark pair is a promising process to investigate the related Yukawa interaction and the properties of the Higgs. Compared with the pure scalar sector in the Standard Model, the Higgs sector contains both scalars and pseudoscalars in many new physics models, which makes the ttH interaction more complex and provides a variety of phenomena. To investigate the ttH interaction and the properties of the Higgs, we study the top quark spin correlation observables at the LHC. 相似文献
16.
B. Mellado 《Pramana》2009,72(1):15-22
These proceedings summarize the sensitivity for the CMS and ATLAS experiments at the LHC to discover a Standard Model Higgs
boson with relatively low integrated luminosity per experiment. The most relevant discovery modes are dealt with. A brief
discussion on the expected performance from these experiments in searches for one or more of the Higgs bosons from the minimal
version of the supersymmetric theories is also included.
相似文献
17.
18.
Unification at MGUT∼3×1016 GeV of the three Standard Model (SM) gauge couplings can be achieved by postulating the existence of a pair of vectorlike fermions carrying SM charges and masses of order 300 GeV–1 TeV. The presence of these fermions significantly modifies the vacuum stability and perturbativity bounds on the mass of the SM Higgs boson. The new vacuum stability bound in this extended SM is estimated to be 117 GeV, to be compared with the SM prediction of about 128 GeV. An upper bound of 190 GeV is obtained based on perturbativity arguments. The impact on these predictions of type I seesaw physics is also discussed. The discovery of a relatively ‘light’ Higgs boson with mass ∼117 GeV could signal the presence of new vectorlike fermions within reach of the LHC. 相似文献
19.
Large higher-order corrections enter the Higgs boson sector of the MSSM via Higgs-boson self-energies. Their effects have
to be taken into account for the correct treatment of loop-corrected Higgs-boson mass eigenstates as external (on-shell) or
internal particles in Feynman diagrams. We review how the loop corrections, including momentum dependence and imaginary contributions,
are correctly taken into account for external (on-shell) Higgs boson and how effective couplings can be derived. The procedures
are implemented in the code FeynHiggs2.4.
相似文献
20.
The new particle around 125 GeV observed at the LHC is almost consistent with the standard model Higgs boson, except that the diphoton decay mode may be excessive. We summarize a number of possibilities. We propose to use the vector-boson fusion to test the underlying model for electroweak symmetry breaking. Using the well known dijet-tagging technique to single out the vector-boson fusion mechanism, we investigate potential of vector-boson fusion to discriminate a number of models suggested to give an enhanced inclusive diphoton production rate. 相似文献