1,721,087 research outputs found
Heavy-quark fragmentation: perturbative resummation with the analytic coupling model
No full textWe describe a model to include non-perturbative corrections to heavy-quark fragmentation, based on next-to-next-to-leading logarithmic threshold resummation and on an effective QCD coupling not containing the Landau pole. We present a phenomenological comparison between the predictions of the model and experimental data from B and D meson fragmentation in e(+)e(-) annihilation
Higher order QCD corrections for the Drell-Yan process
No full textIn this talk we consider higher-order QCD corrections for Drell-Yan like processes. In particular
we present results for next-to-next-to-leading order (NNLO) QCD calculations at fully differential
level, for vector boson production and for associated W -Higgs production at hadron colliders. The
calculations are based on the qT -subtraction formalism and are implemented in parton level Monte Carlo numerical programs. The codes allow the user to apply arbitrary (infrared safe) kinematical cuts on the final state leptons and on the accompanying jet activity. We show some illustrative numerical results at the Tevatron and the LHC
Threshold resummation with the analytic coupling model in b and c-quark fragmentation
No full textWe present a model to include non-perturbative corrections to heavy-quark fragmentation. The model is based on next-to-next-to-leading logarithmic perturbative threshold resummation and on an analytic QCD coupling not containing the Landau pole. We compare the predictions of the model against the experimental data from B and D meson fragmentation in e+e- Annihilation. Our model gives a good description of the experimental data without introducing any free non-perturbative parameter
Diphoton production at hadron colliders in NNLO QCD
No full textWe consider higher-order QCD corrections for direct photon pair production in hadron collisions and we present results for the next-to-next-to-leading order (NNLO) calculation at fully differential level. The calculation is based on the qT -subtraction formalism and it is implemented in a parton level Monte Carlo numerical program. The program allows the user to apply arbitrary infrared-safe kinematical cuts on the final-state photons and on the accompaining jet activity. We show some illustrative numerical results at the LHC and the Tevatron
Higher-order QCD corrections to associated VH production with H → bb ̄ decay at the LHC
No full textWe consider QCD radiative corrections to the production of a Standard Model Higgs boson H in association with a vector boson V (V = W/Z) at hadron colliders. We present a fully exclusive perturbative QCD calculation at next-to-next-to-leading order (NNLO) for the production of the VH pair, including the Higgs boson decay into a bottom-antibottom quark (bb ̄) pair up to nextto-leading order in QCD. We consider the selection cuts that are typically applied in the LHC experimental analysis, and we compare perturbative fixed-order results with NLO parton shower predictions
Fully differential NNLO QCD calculations for vector boson and W-Higgs production at hadron colliders [Higher order QCD corrections for the Drell-Yan process]
No full textIn this talk we consider higher-order QCD corrections for Drell-Yan like processes. In particular we present results for next-to-next-to-leading order (NNLO) QCD calculations at fully differential level, for vector boson production and for associated W-Higgs production at hadron colliders. The calculations are based on the qT -subtraction formalism and are implemented in parton level Monte Carlo numerical programs. The codes allow the user to apply arbitrary (infrared safe) kinematical cuts on the final state leptons and on the accompanying jet activity. We show some illustrative numerical results at the Tevatron and the LHC
Threshold resummation in semi-inclusive B decays
Full text linkWe discuss threshold resummation in radiative and charmless semileptonic B decays. To deal with the large non perturbative effects, we introduce a model for NNLL resummed form factors based on the analytic QCD coupling. By means of this model we can reproduce with good accuracy the experimental data. Finally we briefly present an improved threshold resummed formula to deal with jets initiated by massive quarks as in the case of semileptonic charmed decays
High precision perturbative QCD predictions for Large Hadron Collider physics
No full textTheoretical predictions at an unprecedented level of precision are nowadays indispensable
to fully exploit the discovery potential of the collected and forthcoming data at the CERN
Large Hadron Collider (LHC). In this contribution we present recent results on high-precision
perturbative QCD calculations by considering the formalisms necessary to perform fully-
differential fixed-order calculations at high perturbative order and to resum to all-order the
infrared (Sudakov) large logarithmic corrections. We show illustrative phenomenological
results for cross sections and associated distributions of key LHC processes, such as Higgs
boson, vector boson and diphoton productio
NNLO QCD corrections for Higgs boson production in association with a W boson at the LHC
No full textWe consider QCD corrections to Standard Model Higgs boson production in association with a iv boson in hadron collisions. We present a fully exclusive perturbative computation at next-to-next-to-leading order (NNLO) including the decay of the Higgs boson into a bb pair at next-to-leading order (NLO). We consider the selection cuts that are typically applied in the LHC experimental analysis, and we compare perturbative fixed-order results with NLO parton shower predictions. Vile comment on such a comparison and we show some illm;trative numerical result
Standard model physics at the LHC
Full text linkIn this brief overview, we summarize theoretical advances and discuss selected topics of Standard Model physics at the Large Hadron Collider (LHC). In particular we show some illustrative recent results in the determination of parton densities and in the calculation of QCD radiative corrections
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