103 research outputs found
Electroweak and QCD corrections to Z -boson production with one b jet in a massive five-flavor scheme
No full textWe compute the O(αsα2) and O(αs2α) contributions to the production cross section of a Z boson with one b jet at the Large Hadron Collider (LHC) and study their phenomenological relevance for LHC physics. The accurate prediction of hadronic Z+b-jet production is needed to control a background that greatly affects both the measurement of Higgs-boson properties and the searches of new physics at the LHC. At the same time it could enable the first precise measurement of the b-quark parton distribution function. In this context b-quark mass effects become relevant and need to be studied with care, both at the level of the hard process and at the level of the initial- and final-state parton evolution. It is the aim of this paper to explore some of these issues in the framework of a massive five-flavor scheme and to assess the need for the inclusion of both electroweak corrections, in addition to QCD corrections, and b-quark mass effects in the prediction of total and differential cross sections for hadronic Z+b-jet production
Probing anomalous quartic gauge-boson couplings via 4 fermions+
No full textAll lowest-order amplitudes for e+e- --> 4f+gamma are calculated including five anomalous quartic gauge-boson couplings that are allowed by electromagnetic gauge invariance and the custodial SU(2)_c symmetry. Three of these anomalous couplings correspond to the operators L_0, L_c, and L_n that have been constrained by the LEP collaborations in WWgamma production. The anomalous couplings are incorporated in the Monte Carlo generator RACOONWW. Moreover, for the processes e+e- --> 4f+gamma RACOONWW is improved upon including leading universal electroweak corrections such as initial-state radiation. The discussion of numerical results illustrates the size of the leading corrections as well as the impact of the anomalous quartic couplings for LEP2 energies and at 500GeV
Radiative corrections for the LHC and linear collider era
No full textWe emphasize the importance of including radiative corrections when extracting physics from colliders such as the Tevatron Run II at Fermilab, the Large Hadron Collider (LHC) at CERN, and a future linear collider (LC). We review both well-tested methods and recent advances for calculating these corrections within the Standard Model of electroweak and strong interactions. We discuss the demands on theory and the prospects for matching or exceeding the anticipated experimental precision
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Electroweak radiative corrections to W boson production at the Tevatron
No full textWe present some results of a new calculation of the O({alpha}) electroweak radiative corrections to W boson production at hadron colliders with special emphasis on the transverse mass distribution
MSSM corrections to the top–antitop quark forward–backward asymmetry at the Tevatron
No full textWe study the effects of the complete supersymmetric QCD and electroweak one-loop corrections to the forward–backward asymmetry at the Fermilab Tevatron collider. We work in the complex Minimal Supersymmetric Standard Model (MSSM), only restricted by the condition of minimal flavor violation (MFV). We perform a comprehensive scan over the relevant parameter space of the complex MFV–MSSM and determine the maximal possible contributions of these MSSM loop corrections to the forward–backward asymmetry in the center-of-mass frame. We find that the SUSY loop-induced asymmetry at the Tevatron with M_{t\bar{t}}>450~\mbox{GeV} can be at most +2 % for very light SUSY particles, i.e. for m_{\tilde{t}_{1}} <100~\mbox{GeV} and m_{\min} = \mathrm{Min}\{ m_{\tilde{g}},m_{\tilde{u}_{1,2}},m_{\tilde{d}_{1,2}}\}<100~\mbox{GeV}, which reduces to 0.1 % for gluino and squark masses in the range 850 GeV–1000 GeV and a light top squark of m_{\tilde{t}_{1}}=200~\mbox{GeV}
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Electroweak radiative corrections to W and Z boson production in hadronic collisions
No full textSome results of a calculation of electroweak radiative corrections to {ital W} and {ital Z} boson production in hadronic collisions are presented
Electroweak radiative corrections to e+e−→WW→4 fermions in double-pole approximation — the RacoonWW approach
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