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Search: authors:"M. V. Garzelli"

9 papers found.
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Prompt neutrino fluxes in the atmosphere with PROSA parton distribution functions

Effects on atmospheric prompt neutrino fluxes of present uncertainties affecting the nucleon composition are studied by using the PROSA fit to parton distribution functions (PDFs). The PROSA fit extends the precision of the PDFs to low x, which is the kinematic region of relevance for high-energy neutrino production, by taking into account LHCb data on charm and bottom ...

Lepton fluxes from atmospheric charm revisited

We update predictions for lepton fluxes from the hadroproduction of charm quarks in the scattering of primary cosmic rays with the Earth’s atmosphere. The calculation of charm-pair hadroproduction applies the latest results from perturbative QCD through next-to-next-to-leading order and modern parton distributions, together with estimates on various sources of uncertainties. Our ...

A critical appraisal and evaluation of modern PDFs

We review the present status of the determination of parton distribution functions (PDFs) in the light of the precision requirements for the LHC in Run 2 and other future hadron colliders. We provide brief reviews of all currently available PDF sets and use them to compute cross sections for a number of benchmark processes, including Higgs boson production in gluon–gluon fusion at ...

Hadroproduction of \( t\overline{t}b\overline{b} \) final states at LHC: predictions at NLO accuracy matched with parton shower

We present predictions for the hadroproduction of \( t\overline{t}b\overline{b} \) final states at the LHC with collision energies \( \sqrt{s} \) = 8 TeV and 14 TeV at NLO accuracy matched with parton shower, as obtained with PowHel + PYTHIA. We quantify the effects of parton shower and hadronization. We find these are in general moderate except the effect of the decay of heavy ...

Impact of heavy-flavour production cross sections measured by the LHCb experiment on parton distribution functions at low x

The impact of recent measurements of heavy-flavour production in deep inelastic ep scattering and in pp collisions on parton distribution functions is studied in a QCD analysis in the fixed-flavour number scheme at next-to-leading order. Differential cross sections of charm- and beauty-hadron production measured by LHCb are used together with inclusive and heavy-flavour production ...

t \( \bar{\mathrm{t}} \) W± + t \( \bar{\mathrm{t}} \) Z hadroproduction at NLO accuracy in QCD with Parton Shower and Hadronization effects

We present theoretical predictions for the hadroproduction of t \( \bar{\mathrm{t}} \) W+, t \( \bar{\mathrm{t}} \) W− and t \( \bar{\mathrm{t}} \) Z at LHC as obtained by matching numerical computations at NLO accuracy in QCD with Shower Monte Carlo programs. The calculation is performed by PowHel, relying on the POWHEG-BOX framework, that allows for the matching between the fixed ...

Feynman rules for the rational part of the electroweak 1-loop amplitudes in the Rξ gauge and in the unitary gauge

We present the complete set of Feynman rules producing the rational terms of kind R2 needed to perform any 1-loop calculation in the Electroweak Standard Model. Our formulae are given both in the R ξ gauge and in the Unitary gauge, therefore completing the results in the ’t Hooft-Feynman gauge already presented in a previous publication. As a consistency check, we verified, in the ...

Feynman rules for the rational part of the electroweak 1-loop amplitudes

We present the complete set of Feynman rules producing the rational terms of kind R2 needed to perform any 1-loop calculation in the Electroweak Standard Model. Our results are given both in the ’t Hooft-Veltman and in the Four Dimensional Helicity regularization schemes. We also verified, by using both the ’t Hooft-Feynman gauge and the Background Field Method, a huge set of Ward ...