نتایج جستجو برای: large cross section
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In this article we review the mechanisms in several supersymmetric models for producing gluinos at the LHC and its potential for discovering them. We focus on the MSSM and its left-right extensions. We study in detail the strong sector of both models. Moreover, we obtain the total cross section and differential distributions. We also make an analysis of their uncertainties, such as the gluino a...
A search for the production of neutral Higgs bosons Φ decaying into ττ final states in pp collisions at a center-of-mass energy of 1.96 TeV is presented. The data, corresponding to an integrated luminosity of up to 348 pb, were collected by the DØ experiment at the Fermilab Tevatron Collider. Since no excess compared to the expectation from standard model processes is found, limits on the produ...
The large parton flux at high energy gives rise to events where different pairs of partons interact contemporarily with large momentum exchange. A main effect of multiple parton interactions is to generate events with many jets at relatively large transverse momenta. The large value of the heavy quarks production cross section may however give also rise a sizable rate of events with several b-q...
We calculate the production of a W boson and a single b jet to next-to-leading order in QCD at the Fermilab Tevatron and the CERN Large Hadron Collider. Both exclusive and inclusive cross sections are presented. We separately consider the cross section for jets containing a single b quark and jets containing a bb̄ pair. There are a wide variety of processes that contribute, and it is necessary t...
S. Chatrchyan et al.* (CMS Collaboration) (Received 17 August 2011; published 14 November 2011) A new measurement of the inclusive production cross section for pp ! t t is performed at a center-ofmass energy of 7 TeV using data collected by the CMS experiment at the LHC. The analysis uses a data sample corresponding to an integrated luminosity of 36 pb , and is based on the final state with one...
The purely electroweak (EW) cross section for the production of two jets in association with a Z boson, in proton–proton collisions at √ s = 8 TeV, is measured using data recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 19.7 fb−1. The electroweak cross section for the jj final state (with = e or μ and j representing the quarks produced in the hard int...
At tree-level Higgs production in association with a b-quark pair proceeds through the small Yukawa bottom coupling in the Standard Model. Even in the limit where this coupling vanishes, electroweak one-loop effects, through the top-Higgs Yukawa coupling in particular, can still trigger this reaction. This contribution is small for Higgs masses around 120GeV but it quickly picks up for higher H...
We discuss the strength of the trilinear Higgs boson coupling in technicolor (or composite) models in a model independent way. The coupling is determined as a function of a very general ansatz for the technicolor self-energy, and turns out to be equal or smaller than the one of the standard model Higgs boson depending on the dynamics of the theory. With this trilinear coupling we estimate the c...
The application of the two-photon process pp → pp+μμ for the luminosity measurements at LHC with the ATLAS detector is considered. The expected accuracy of the absolute offline luminosity determination is 1 ÷ 2 % for the luminosity range of 10 ÷10 cm s. The preliminary cross section estimates done for LHCb promise the same level of the luminosity measurement accuracy at L = 2 · 10 cm s.
I present the resummation of collinear and soft gluon corrections to single top quark production in the t channel at next-to-next-to-leading logarithm (NNLL) accuracy using two-loop soft anomalous dimensions. The expansion of the resummed cross section yields approximate next-to-next-to-leading order (NNLO) cross sections. Numerical results for t-channel single top quark (or single antitop) pro...
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