共查询到20条相似文献,搜索用时 15 毫秒
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We show how a measurement of the process pp→tt̄H0+X at the Large Hadron Collider (LHC) and a measurement of the Higgs boson branching ratios BR(H0→bb̄) and BR(H0→W+W-) at a future linear electron positron collider (ILC) can be combined to extract a value of the top quark Yukawa coupling
in a model-independent way. We find that for masses with 120 GeV/c2<mH<200 GeV/c2 a measurement precision of 15% including systematic uncertainties can be achieved for integrated luminosities of 300 fb-1 at the LHC and 500 fb-1 at the ILC at a centre-of-mass energy of 350 GeV. 相似文献
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C. Merino C. Pajares Yu. M. Shabelski 《The European Physical Journal C - Particles and Fields》2011,71(5):1652
We consider the first LHC data for pp collisions in the framework of Regge theory. The integral cross sections and inclusive densities of secondaries are determined
by the Pomeron exchange, and we present the corresponding predictions for them. The first measurements of inclusive densities
in the midrapidity region are in agreement with these predictions. The contribution of the baryon-number transfer due to String
Junction diffusion in the rapidity space is at the origin of the differences in the inclusive spectra of particle and antiparticle
in the central region, and this effect could be significant at LHC energies. We discuss the first data of ALICE and LHCb collaborations
on the baryon/antibaryon asymmetry at LHC. 相似文献
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A. V. Berezhnoy A. K. Likhoded A. V. Luchinsky A. A. Novoselov 《Physics of Atomic Nuclei》2013,76(1):102-112
Cross sections for J/ψ mesons produced in association with open charm and two charmed hadrons from different $c\bar c$ pairs under LHC conditions are predicted theoretically. The respective processes are considered both in single and in double parton interactions. Particular attention is given to kinematical limits of the LHCb detector, and a comparison with the most recent experimental data is performed for them. 相似文献
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O. Çakır İ. T. Çakır H. Duran Yıldız R. Mehdiyev 《The European Physical Journal C - Particles and Fields》2008,56(4):537-543
We study the single production of fourth-family quarks through the process pp→Q′jX at the Large Hadron Collider (LHC). We have calculated the decay widths and branching ratios of the fourth-family quarks
(b′ and t′) in the mass range 300–800 GeV. The cross sections for the signal and background processes have been calculated in a Monte
Carlo framework. It is shown that the LHC can discover single t′ and b′ quarks if the CKM matrix elements |V
t′q
|,|V
qb′|≳0.01. 相似文献
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We explore constraints on various new physics resonances from four top-quark production based on current experimental data.Both light and heavy resonances are studied in this work.A comparison of the full width effect and narrow width approximation is also presented. 相似文献
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Diptimoy Ghosh Monoranjan Guchait Dipan Sengupta 《The European Physical Journal C - Particles and Fields》2012,72(9):1-7
We have analyzed the prospect of detecting a Higgs signal in mSUGRA/cMSSM based Supersymmetric (SUSY) model via chargino-neutralino ( ${\tilde{\chi}}^{\pm}_{1}\tilde{\chi}^{0}_{2}In order to generate mass for an abelian spin-1 vector field while preserving gauge invariance we couple it to a symmetric tensor. The derivative coupling includes up to three derivatives. We show that unitarity, causality and absence of Stueckelberg (compensating) fields single out a unique model up to trivial field redefinitions. The model contains one massive and one massless spin-1 particle. It is shown by means of a master action to be dual to the direct sum of a Maxwell plus a Maxwell?CProca theory. 相似文献
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M. V. Chizhov V. A. Bednyakov J. A. Budagov 《Physics of Particles and Nuclei Letters》2013,10(2):144-146
The main distribution for a bump search is the dilepton-invariant-mass distribution with appropriate cut on an absolute value of pseudorapidity difference Δη ≡ |η1 ? η2| between the two leptons. The back-ground from the Standard Model Drell-Yan process contributes mainly to the central pseudorapidity region Δη ≈ 0. By contrast, the excited bosons lead to a peak at Δη ≈ 1.76. We show that this property allows one to enhance the significance of their bump search by means of the new cut optimization. Nevertheless, in order to confirm an observation of the bump and reveal the resonance nature, other angular distributions should be used in addition. 相似文献
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Robert Harlander 《Pramana》2006,67(5):875-884
Recent theoretical developments concerning Higgs production at the large hadron collider are reviewed, both in the standard
model and in the MSSM. Emphasis is put on the inclusive and exclusive cross-sections for gluon fusion, as well as on the associated
production with bottom quarks. 相似文献
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Y. Kiyo J. H. Kühn S. Moch M. Steinhauser P. Uwer 《The European Physical Journal C - Particles and Fields》2009,60(3):375-386
The next-to-leading order analysis for the cross section for hadroproduction of top-quark pairs close to threshold is presented.
Within the framework of non-relativistic QCD a significant enhancement compared to fixed-order perturbation theory is observed
which originates from the characteristic remnant of the 1S peak below production threshold of top-quark pairs. The analysis includes all color-singlet and color-octet configurations
of top-quark pairs in S-wave states and, for the dominant configurations, it employs all-order soft-gluon resummation for the hard parton cross section.
Numerical results for the Large Hadron Collider at
TeV and
TeV and also for the Tevatron are presented. The possibility of a top-quark mass measurement from the invariant-mass distribution
of top-quark pairs is discussed. 相似文献
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A. V. Kisselev 《Physics of Particles and Nuclei Letters》2014,11(6):716-719
In the framework of the Randall-Sundrum-like scenario with the small curvature κ (RSSC model), p ⊥-distributions for the dielectron production at the LHC are calculated. For the summary statistics taken at 7 TeV (L = 5 fb?1) and 8 TeV (L = 20 fb?1), the exclusion limit on the 5-dimensional gravity scale M 5 is found to be 6.35 TeV at 95% C.L. For √s = 13 TeV and integrated luminosity 30 fb?1, the LHC search limit is estimated to be 8.95 TeV. These limits on M 5 are independent of κ, provided the relation κ ? M 5 is satisfied. 相似文献
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We outline some of the popular mass restricting variables for the semi-invisible productions at the Large Hadron Collider. In this context, heavy resonating mass, if produced through antler decay topology may already be detectable. New mass variables constructed by applying this mass constraint proved to have an array of interesting properties, including a new kink solution at the true masses of the produced particles. This enables one to measure the mass of the invisible particle and the parent particle simultaneously. This variable in turn can also be applied in reconstructing such events with the momenta of invisible particles. This feature is further demonstrated with the Higgs boson decaying into a pair of third-generation tau-lepton (\(\tau \)) and thus exploring direct Higgs coupling with the leptonic sector. Dominant discovery signatures rely upon the hadronic decay of tau which is associated with a pair of invisible neutrinos. Exploiting the already measured Higgs mass bound, present technique is capable of providing unique event reconstruction. Moreover, a significant efficiency enhancement is demonstrated in comparison with the existing methods. 相似文献