共查询到20条相似文献,搜索用时 15 毫秒
1.
HaiChen Wang 《中国科学:物理学 力学 天文学(英文版)》2014,57(10):1822-1834
The Standard Model (SM) Higgs boson was predicted by theorists in the 1960s during the development of the electroweak theory. Prior to the startup of the CERN Large Hadron Collider (LHC), experimental searches found no evidence of the Higgs boson. In July 2012, the ATLAS and CMS experiments at the LHC reported the discovery of a new boson in their searches for the SM Higgs boson. Subsequent experimental studies have revealed the spin-0 nature of this new boson and found its couplings to SM particles consistent to those of a Higgs boson. These measurements confirmed the newly discovered boson is indeed a Higgs boson. More measurements will be performed to compare the properties of the Higgs boson with the SM predictions. 相似文献
2.
The large hadron collider (LHC) and its detectors, ATLAS and CMS, are being built to study TeV scale physics, and to fully
understand the electroweak symmetry breaking mechanism. The Monte-Carlo simulation results for the standard model and minimal
super symmetric standard model Higgs boson searches and parameter measurements are discussed. Emphasis is placed on recent
investigations of Higgs produced in association with top quarks and in vector boson fusion channels. These results indicate
that Higgs sector can be explored in many channels within a couple of years of LHC operation, i.e.,L = 30 fb−1. Complete coverage including measurements of Higgs parameters can be carried out with full LHC program. 相似文献
3.
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
4.
The Elementary Goldstone Higgs(EGH) model is a perturbative extension of the standard model(SM),which identifies the EGH boson as the observed Higgs boson. In this paper, we study pair production of the EGH boson via gluon fusion at the LHC and find that the resonant contribution of the heavy scalar is very small and the SM-like triangle diagram contribution is strongly suppressed. The total production cross section mainly comes from the box diagram contribution and its value can be significantly enhanced with respect to the SM prediction. 相似文献
5.
We investigated the neutral Higgs boson pair
production at the CERN Large Hadron Collider (LHC) in the SM with
four families. We found that the gluon-gluon fusion mode is the
most dominant one in producing neutral Higgs boson pair at the
LHC, and it can be used to probe the trilinear Higgs coupling. If
the heavy quarks of the fourth generation really exist within the
SM, they can manifest their effect on the cross section of the
Higgs pair production process at the LHC. Our numerical results
show that there will be 2×104 neutral Higgs boson pair
production events per year if the next generation heavy quarks
really exist, while there will be only 2×103 events
produced per year if there are only three families in the SM. 相似文献
6.
At the CERN large hadron collider (LHC), production of the Higgs boson in association with Z or W bosons provides a dramatic experimental signal for detecting the standard model (SM) Higgs boson. In this paper, we consider the contributions of the left-right twin Higgs (LRTH) model to the processes q\bar{q}→Z(W)H. Our numerical results show that, in the favorable parameter spaces, the cross sections deviate distinctly from the predictions
of the SM. The possible signals of the LRTH model can be detected via these processes at the LHC experiments. 相似文献
7.
Michael Dittmar 《Pramana》2000,55(1-2):151-160
The latest unsuccessful Higgs searches at LEP have pushed its mass well into the domain where significant signals can be expected from the LHC experiments. The most sensitive LHC Higgs signatures are reviewed and the discovery year is estimated as a function of the Higgs mass. Finally, we give some ideas about: ‘What might be known about the production and decays of a SM Higgs boson’ after 10 years of LHC? 相似文献
8.
Tomio KOBAYASHI 《Proceedings of the Japan Academy. Series B, Physical and biological sciences》2021,97(5):211
The history concerning an experimental verification of the standard model of particle physics is reviewed with special emphasis on results from experiments using the highest-energy particle colliders, namely, PETRA, LEP and LHC. This article covers physics subjects from discovering the gluon and precise measurements at LEP, to discovering the Higgs boson. It also covers some searches for physics beyond the standard model, particularly supersymmetry, as well as recent developments of some particle detectors that were used in those experiments. 相似文献
9.
We explore the possibility of distinguishing the SM-like MSSM Higgs boson from the SM Higgs boson via Higgs boson pair production
at future muon collider. We study the behavior of the production cross-section in SM and MSSM with Higgs boson mass for various
MSSM parameters tan β and m
A
. We observe that at fixed CM energy, in the SM, the total cross-section increases with the increase in Higgs boson mass whereas
this trend is reversed for the MSSM. The changes that occur for the MSSM in comparison to the SM predictions are quantified
in terms of the relative percentage deviation in cross-section. The observed deviations in cross-section for different choices
of Higgs boson masses suggest that the measurements of the cross-section could possibly distinguish the SM-like MSSM Higgs
boson from the SM Higgs boson.
相似文献
10.
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
11.
Sebastian Bock Remi Lafaye Tilman Plehn Michael Rauch Dirk Zerwas Peter M. Zerwas 《Physics letters. [Part B]》2010
Higgs couplings can be affected by physics beyond the Standard Model. We study modifications through interactions with a hidden sector and in specific composite Higgs models accessible at the LHC. Both scenarios give rise to congruent patterns of universal, or partially universal, shifts. In addition, Higgs decays to the hidden sector may lead to invisible decay modes which we also exploit. Experimental bounds on such potential modifications will measure the concordance of an observed Higgs boson with the Standard Model. 相似文献
12.
安芬芬 白羽 陈春晖 陈新 陈振兴 Joao Guimaraes da Costa 崔振崴 方亚泉 付成栋 高俊 高艳彦 高原宁 葛韶锋 顾嘉荫 郭方毅 郭军 韩涛 韩爽 何红建 何显柯 何小刚 胡继峰 徐士杰 金山 荆茂强 Susmita Jyotishmati Ryuta Kiuchi 郭家铭 赖培筑 李博扬 李聪乔 李刚 李海峰 李亮 李数 李通 李强 梁浩 梁志均 廖立波 刘波 刘建北 刘涛 刘真 娄辛丑 马连良 Bruce Mellado 莫欣 Mila Pandurovic 钱剑明 钱卓妮 Nikolaos Rompotis 阮曼奇 Alex Schuy 单连友 史静远 史欣 苏淑芳 王大勇 王锦 王连涛 王贻芳 魏彧骞 许悦 杨海军 杨迎 姚为民 于丹 张凯栗 张照茹 赵明锐 赵祥虎 周宁 《中国物理C(英文版)》2019,(4)
The discovery of the Higgs boson with its mass around 125 GeV by the ATLAS and CMS Collaborations marked the beginning of a new era in high energy physics.The Higgs boson will be the subject of extensive studies of the ongoing LHC program.At the same time,lepton collider based Higgs factories have been proposed as a possible next step beyond the LHC,with its main goal to precisely measure the properties of the Higgs boson and probe potential new physics associated with the Higgs boson.The Circular Electron Positron Collider(CEPC)is one of such proposed Higgs factories.The CEPC is an e~+e~- circular collider proposed by and to be hosted in China.Located in a tunnel of approximately 100 km in circumference,it will operate at a center-of-mass energy of 240 GeV as the Higgs factory.In this paper,we present the first estimates on the precision of the Higgs boson property measurements achievable at the CEPC and discuss implications of these measurements. 相似文献
13.
Rohini M Godbole 《Pramana》2006,67(5):835-847
In this talk I discuss some aspects of CP violation (CPV) in supersymmetry (SUSY) as well as in the Higgs sector. Further,
I discuss ways in which these may be probed at hadronic colliders. In particular I will point out the ways in which studies
in the
sector at the Tevatron may be used to provide information on this and how the search can be extended to the LHC. I will then
follow this by a discussion of the CP mixing induced in the Higgs sector due to the above-mentioned CPV in the soft SUSY breaking
parameters and its effects on the Higgs phenomenology at the LHC. I would then point out some interesting aspects of the phenomenology
of a moderately light charged Higgs boson, consistent with the LEP constraints, in this scenario. Decay of such a charged
Higgs boson would also allow a probe of a light (≲50 GeV), CP-violating (CPV) Higgs boson. Such a light neutral Higgs boson
might have escaped detection at LEP and could also be missed at the LHC in the usual search channels. 相似文献
14.
It is likely that the LHC will observe a color- and charge-neutral scalar whose decays are consistent with those of the standard model (SM) Higgs boson. The Higgs interpretation of such a discovery is not the only possibility. For example, electroweak symmetry breaking could be triggered by a spontaneously broken, nearly conformal sector. The spectrum of states at the electroweak scale would then contain a narrow scalar resonance, the pseudo-Goldstone boson of conformal symmetry breaking, with Higgs-boson-like properties. If the conformal sector is strongly coupled, this pseudodilaton may be the only new state accessible at high energy colliders. We discuss the prospects for distinguishing this mode from a minimal Higgs boson at the LHC and ILC. The main discriminants between the two scenarios are (i) cubic self-interactions and (ii) a potential enhancement of couplings to massless SM gauge bosons. 相似文献
15.
《Comptes Rendus Physique》2015,16(4):368-378
To present knowledge, all the physics at the Large Hadron Collider (LHC) can be described in the framework of the Standard Model (SM) of particle physics. Indeed the newly discovered Higgs boson with a mass close to 125 GeV seems to confirm the predictions of the SM. Thus, besides looking for direct manifestations of the physics beyond the SM, one of the primary missions of the LHC is to perform ever more stringent tests of the SM. This requires not only improved theoretical developments to produce testable predictions and provide experiments with reliable event generators, but also sophisticated analyses techniques to overcome the formidable experimental environment of the LHC and perform precision measurements. The present article proposes an overview of the present theoretical tools and of the experimental results in the field of strong and electroweak interactions. 相似文献
16.
As one of the key properties of the Higgs boson, the Higgs total width is sensitive to the global profile of the Higgs boson couplings, and thus new physics would modify the Higgs width. We investigate the total width in various new physics models, including various scalar extensions, composite Higgs models, and the fraternal twin Higgs model. Typically, the Higgs width is smaller than the standard model value due to mixture with other scalars if the Higgs is elementary, or curved Higgs field space for the composite Higgs. On the other hand, except for the possible invisible decay mode, the enhanced Yukawa coupling in the two Higgs doublet model or the exotic fermion embeddings in the composite Higgs could enhance the Higgs width greatly. The precision measurement of the Higgs total width at the high-luminosity LHC can be used to discriminate certain new physics models. 相似文献
17.
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
18.
In this review we do not try to cover all the aspects of physics besnd tile standard model (BSM), instead our latest understanding on tile BSM will be presented: i) Tile Higgs sector is likely related to BSM, which can be confirmed at current running large hadron collider (LHC) or tile fllture eolliders. Furthermore we pointed out that spontaneous CP violation can be closely related to the lightness of the Higgs boson, ii) Top quark forward-backward asymmetry, which was mea.sured by Tewttron, might be the sign of BSM.2; proposed a new color-octet particle Zcr to account fi)r the observation and Z can be fllrther studied at the LHC. iii) If dark matter (DM) is utilized to accommodate astrophysical obserwtions, it ought to be observed at the high energy LttC and DM produced at colliders should be tile slnoking gun signal, iv) Lithium puzzle might also be the sign of the BSM. We briefly review tile newly proposed solution to Lithium puzzle, i.e.. the existonce of non-thermal component during the big bang nuclei-synthesis (BBN). The possible origins of the non-thermal coinponent can be dark matter or the new accelerating mechanism of normal particles. 相似文献
19.
The exclusive decay of the Higgs boson to a vector meson(J/ψ or Υ(1 S)) and Z boson is studied in this work. The decay amplitudes are separated into two parts in a gauge invariant manner. The first part comes from the direct coupling of the Higgs boson to the charm(bottom) quark and the other from the HZZ*or the loop-induced HZγ*vertexes in the standard model. While the branching ratios from the direct channel are much smaller than those of the indirect channel, their interference terms give nontrivial contributions. We further calculate the QCD radiative corrections to both channels, which reduce the total branching ratios by around 20% for both J/ψ and Υ(1S) production. Our results provide a possible chance to check the SM predictions of the Hcc(Hbb)coupling and to seek for hints of new physics at the High Luminosity LHC or future hadron colliders. 相似文献
20.
I start with a brief introduction to Higgs mechanism and supersymmetry. Then I discuss the theoretical expectations, current
limits and search strategies for Higgs boson(s) at LHC — first in the SM and then in the MSSM. Finally I discuss the signatures
and search strategies for the superparticles. 相似文献