A concise review about the status of the calculation of radiative corrections to the Drell-Yan processes is presented. The effect of matching together exact electroweak O(alpha) corrections with higher-order QED effects due to multiple photon emission is displayed in some physical distributions in the charged current channel, which have obtained with the new version of the event generator HORACE
We present a detailed study of the charged current Drell-Yan process, which includes the exact O(alpha) electroweak corrections properly matched with leading-log effects due to multiple-photon emission, as required by the experiments at the Tevatron and the LHC. Numerical results for the relevant observables of single W boson production at hadron colliders are presented. The impact of the radiative corrections and of some sources of theoretical uncertainty is discussed in detail. The calculation has been implemented in the new version of the event generator HORACE, which is available for precision simulations of the charged current Drell-Yan process
The production of four fermions plus a visible photon in electron-positron collisions is analyzed, with particular emphasis on the LEP2 energy range. The study is based on the calculation of exact matrix elements, including the effect of fermion masses. In the light of the present measurements performed at LEP, triple and quartic anomalous gauge couplings are taken into account. Due to the presence of a visible photon in the final state, particular attention is paid to the treatment of higher-order QED corrections. Explicit results for integrated cross sections and differential distributions are shown and commented. The features of the Monte Carlo program WRAP, used to perform the calculation and available for experimental analysis, are described
To avoid loss of sensitivity in the search for new physics in single- and multi-photon final states with large missing energy at LEP, precise predictions for the Standard Model irreducible background are required. At LEP1 the theoretical situation is satisfactory. Going to LEP2, some improvements are necessary. To this aim, the matrix elements for the processes e+e- → vv̄nγ, with n = 1,2,3, are exactly computed in the Standard Model, including the possibility of anomalous couplings for single-photon production. Due to the presence of observed photons in the final state, particular attention is paid to the treatment of higher-order QED corrections. Comparisons with existing calculations are shown and commented. An improved version of the event generator NUNUGPV is presented
The search for new physics in single- and multi-photon final states with large missing energy at LEP and future e^+ e^- colliders requires precise predictions for the Standard Model irreducible background. While at LEP1 the theoretical situation is under control, going to LEP2 (and beyond) some improvements are necessary. To approach the aimed O(1 theoretical accuracy, the tree-level matrix elements for the processes e+e−→ννˉthepossibilityofanomalouscouplingsforsingle−photonproduction.Duetothepresenceofobservedphotonsinthefinalstate,particularattentionispaidtothetreatmentofhigher−orderQEDcorrections.Comparisonswithexistingcalculationsareshownandcommented.AnimprovedversionoftheeventgeneratorNUNUGPVispresented.Thesearchfornewphysicsinsingle−andmulti−photonfinalstateswithlargemissingenergyatLEPandfuturee+e−collidersrequiresprecisepredictionsfortheStandardModelirreduciblebackground.WhileatLEP1thetheoreticalsituationisundercontrol,goingtoLEP2(andbeyond)someimprovementsarenecessary.ToapproachtheaimedO(1%)theoreticalaccuracy,thetree−levelmatrixelementsfortheprocessese^+ e^- \to \nu \bar\nu n\gamma,withn=1,2,3,areexactlycomputedintheStandardModel,includingthepossibilityofanomalouscouplingsforsingle−photonproduction.Duetothepresenceofobservedphotonsinthefinalstate,particularattentionispaidtothetreatmentofhigher−orderQEDcorrections.Comparisonswithexistingcalculationsareshownandcommented.AnimprovedversionoftheeventgeneratorNUNUGPVispresented.Thesearchfornewphysicsinsingle−andmulti−photonfinalstateswithlargemissingenergyatLEPandfuturee+e−collidersrequiresprecisepredictionsfortheStandardModelirreduciblebackground.WhileatLEP1thetheoreticalsituationisundercontrol,goingtoLEP2(andbeyond)someimprovementsarenecessary.ToapproachtheaimedO(1%)theoreticalaccuracy,thetree−levelmatrixelementsfortheprocessese^+ e^- \to \nu \bar\nu n\gamma,withn=1,2,3,areexactlycomputedintheStandardModel,includingthepossibilityofanomalouscouplingsforsingle−photonproduction.Duetothepresenceofobservedphotonsinthefinalstate,particularattentionispaidtothetreatmentofhigher−orderQEDcorrections.Comparisonswithexistingcalculationsareshownandcommented.AnimprovedversionoftheeventgeneratorNUNUGPVispresented.Thesearchfornewphysicsinsingle−andmulti−photonfinalstateswithlargemissingenergyatLEPandfuturee+e−collidersrequiresprecisepredictionsfortheStandardModelirreduciblebackground.WhileatLEP1thetheoreticalsituationisundercontrol,goingtoLEP2(andbeyond)someimprovementsarenecessary.ToapproachtheaimedO(1%)theoreticalaccuracy,thetree−levelmatrixelementsfortheprocessese^+ e^- \to \nu \bar\nu n\gamma$, with n=1,2,3, are exactly computed in the Standard Model, including the possibility of anomalous couplings for single-photon production. Due to the presence of observed photons in the final state, particular attention is paid to the treatment of higher-order QED corrections. Comparisons with existing calculations are shown and commented. An improved version of the event generator NUNUGPV is presented.The search for new physics in single- and multi-photon final states with large missing energy at LEP and future e + e − colliders requires precise predictions for the Standard Model irreducible background. While at LEP1 the theoretical situation is under control, going to LEP2 (and beyond) some improvements are necessary. To approach the aimed O (1%) theoretical accuracy, the tree-level matrix elements for the processes e + e − → ν ν nγ , with n = 1, 2, 3, are exactly computed in the Standard Model, including the possibility of anomalous couplings for single-photon production. Due to the presence of observed photons in the final state, particular attention is paid to the treatment of higher-order QED corrections. Comparisons with existing calculations are shown and commented on. An improved version of the event generator NUNUGPV is presented
After discussing the relevance of single-W and single-Z production processes at hadron colliders, a review of the theoretical knowledge of Drell-Yan physics is given, with some emphasis on the available implementations in simulation tools, in view of the LHC startup
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