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1.
《中国物理C(英文版)》2016,(6)
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
2.
L.G. Jin C.S. Li R.J. Oakes S.H. Zhu 《The European Physical Journal C - Particles and Fields》2000,14(1):91-101
We calculate the Yukawa corrections of order to charged Higgs boson production in association with a top quark at the Tevatron and the LHC. The corrections are not very
sensitive to the mass of the charged Higgs boson and can exceed for low values of , where the contribution of the top quark is large, and high values of where the contribution of the bottom quark becomes large. These Yukawa corrections could be significant for charged Higgs
boson searches based on this production process, particularly at the LHC where the cross section is relatively large.
Received: 12 October 1999 / Revised version: 3 December 1999 / Published online: 6 April 2000 相似文献
3.
Physics of Atomic Nuclei - To date, Higgs boson production has been observed at the Large Hadron Collider (LHC) in four different channels. Associated Higgs boson production with a single top quark... 相似文献
4.
Inclusive standard model Higgs boson pair production and subsequent decay to same-sign dileptons via weak gauge W+/- bosons at the CERN Large Hadron Collider (LHC) has the capability to determine the Higgs boson self-coupling, lambda. The large top quark mass limit is found not to be a good approximation for the signal if one wishes to utilize differential distributions in the analysis. We find that it should be possible at the LHC with design luminosity to establish that the standard model Higgs boson has a nonzero self-coupling and that lambda/lambda(SM) can be restricted to a range of 0-3.7 at 95% confidence level if its mass is between 150 and 200 GeV. 相似文献
5.
I start with a brief introduction to the elementary particles and their interactions, Higgs mechanism and supersymmetry. The major physics objectives of the Tevatron and LHC colliders are identified. The status and prospects of the top quark, charged Higgs boson and superparticle searches are discussed in detail, while those of the neutral Higgs boson(s) are covered in a parallel talk by R.J.N. Phillips at this workshop. 相似文献
6.
I start with a brief introduction to the elementary particles and their interactions, Higgs mechanism and supersymmetry. The
major physics objectives of the Tevatron and LHC colliders are identified. The status and prospects of the top quark, charged
Higgs boson and superparticle searches are discussed in detail, while those of the neutral Higgs boson(s) are covered in a
parallel talk by R.J.N. Phillips at this workshop. 相似文献
7.
We investigate the prospects for the discovery at the CERN Large Hadron Collider (LHC) of a neutral Higgs boson produced with one bottom quark followed by Higgs decay into a muon pair. We work within the framework of the minimal supersymmetric model. The dominant physics background from the production of b mu(+)mu(-), j mu(+)mu(-), j=g,u,d,s,c, and bbW+W- is calculated with realistic acceptance cuts. Promising results are found for the CP-odd pseudoscalar (A0) and the heavier CP-even scalar (H0) Higgs bosons with masses up to 600 GeV. This discovery channel with one energetic bottom quark greatly improves the discovery potential of the LHC beyond the inclusive channel pp-->phi(0)-->mu(+)mu(-)+X. 相似文献
8.
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
9.
Martin Schumacher 《Annalen der Physik》2014,526(5-6):215-226
The electroweak Higgs boson has been discovered in ongoing experiments at the LHC, leading to a mass of this particle of 126 GeV. This Higgs boson mediates the generation of mass for elementary particles, including the mass of elementary (current) quarks. These current‐quark masses leave 98% of the mass of the atom unexplained. This large fraction is mediated by strong interaction, where instead of the Higgs boson the σ meson is the mediating particle. Though already introduced in 1957 by Schwinger, the σ meson has been integrated out in many theories of hadron properties because it had not been observed and was doubted to exist. With the observation of the σ meson in recent experiments on Compton scattering by the nucleon at MAMI (Mainz) it has become timely to review the status of experimental and theoretical researches on this topic. 相似文献
10.
11.
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
12.
Michael Spira 《Fortschritte der Physik》1998,46(3):203-284
Higgs boson production at the LHC within the Standard Model and its minimal supersymmetric extension is reviewed. The predictions for decay rates and production cross sections are updated by choosing the present value of the top quark mass and recent parton density sets. Moreover, all relevant higher order corrections, some of which have been obtained only recently, are included in a consistent way. 相似文献
13.
We add fermions to an Abelian-gauged hidden sector. We show that the lightest can be the dark matter with the right thermal relic abundance, and discovery is within reach of upcoming dark matter detectors. We also show that these fermions change Higgs boson phenomenology at the Large Hadron Collider (LHC), and in particular could induce a large invisible width to the lightest Higgs boson state. Such an invisibly decaying Higgs boson can be discovered with good significance in the vector boson fusion channel at the LHC. 相似文献
14.
The Gfitter Group J. Haller A. Hoecker R. Kogler K. Mönig T. Peiffer J. Stelzer 《The European Physical Journal C - Particles and Fields》2018,78(8):675
We present an update of the global fit of the Standard Model electroweak sector to latest experimental results. We include new kinematic top quark and W boson mass measurements from the LHC, a \(\sin \!^2\theta ^{\ell }_{\mathrm{eff}}\) result from the Tevatron, and a new evaluation of the hadronic contribution to \(\alpha (M_Z^2)\). We present tests of the internal consistency of the electroweak Standard Model and updated numerical predictions of key observables. The electroweak data combined with measurements of the Higgs boson coupling strengths and flavour physics observables are used to constrain parameters of two-Higgs-doublet models. 相似文献
15.
S. F. Taghavi M. Mohammadi Najafabadi 《International Journal of Theoretical Physics》2014,53(12):4326-4337
We study the angular correlation and the amount of top quark polarization in the production of a higgs boson in association with a single top quark in the t?channel at the LHC. We also study the effect of anomalous W t b couplings on the angular correlation and on the production cross section of the process. The cross section and angular correlation is almost insensitive to the variation of the Higgs boson mass within 3 GeV. The robustness of the angular correlation against the center-of-mass energy of the proton-proton collision, the variation of parton distribution functions, and the change of factorization scale is investigated. The sensitivity of this process to the anomalous couplings is examined. 相似文献
16.
LIU Yao-Bei SHEN Jie-Fen CUI Xiao-Min REN Xiao-Yan 《理论物理通讯》2008,49(5):1279-1282
The littlest Higgs (LH) model is the most economical one among various little Higgs models, which predicts the existence of the charged scalars Φ^±. In this paper, we study the production of the charged Higgs boson Φ^- with single top quark via the process gb →tΦ^- at the CERN Large Hadron Collider (LHC). The numerical results show that the production cross section is sma/ler than 0.2 pb in most of the parameters space, it is very difficult to observe the signatures of the charged scalars via the process pp → gb + X → tΦ^- + X at the LHC experiments. However, it can open a window to distinguish the top-pions in the TC2 model or charged Higgs in the MSSM from Φ^±. 相似文献
17.
Bhupal Dev PS Djouadi A Godbole RM Mühlleitner MM Rindani SD 《Physical review letters》2008,100(5):051801
The search and the probe of the fundamental properties of Higgs boson(s) and, in particular, the determination of their charge conjugation and parity (CP) quantum numbers, are the main tasks of future high-energy colliders. We demonstrate that the CP properties of a standard model-like Higgs particle can be unambiguously assessed by measuring just the total cross section and the top polarization in associated Higgs boson production with top quark pairs in e(+)e(-) collisions. 相似文献
18.
In this paper the charged Higgs signal through the decay to a pair of muon and neutrino (H
±→μν) is analyzed. The analysis attempts to estimate the amount of muonic signal of the charged Higgs at LHC at a center of mass
energy of 14 TeV. The signal process is the top quark pair production with one of the top quarks decaying to a charged Higgs
(non SM anomalous top decay) and the other decaying to a W boson which is assumed to decay hadronically to two light jets.
Due to the small branching ratio of charged Higgs decay to muon, results are quoted for data corresponding to an integrated
luminosity of 300 fb−1 which is expected to be collected at the LHC high luminosity regime. It is shown that a signal significance close to 5σ down to below 1σ is achievable for a charged Higgs mass in the range 80 GeV<m(H
±)<150 GeV taking the top quark pair production with both top quarks decaying to W bosons as the main irreducible background. 相似文献
19.
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
20.
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