Search results for: Leandro Cieri

Items from 1 to 10 out of 10 results

article

Higher-order power corrections in a transverse-momentum cut for colour-singlet production at NLO

Leandro Cieri, Carlo Oleari, Marco Rocco

The European Physical Journal C > 2019 > 79 > 10 > 1-31

We consider the production of a colourless system at next-to-leading order in the strong coupling constant $$\alpha _{{\displaystyle } {\scriptstyle } {\scriptscriptstyle } {\scriptscriptstyle } \mathrm{S}}$$ αS . We impose a transverse-momentum cutoff, $$q_{{\displaystyle } {\scriptstyle } {\scriptscriptstyle } {\scriptscriptstyle } \mathrm{T}}^{{\displaystyle } {\scriptstyle } {\scriptscriptstyle...

article

Higgs boson production at the LHC using the q_T subtraction formalism at N³LO QCD

Leandro Cieri, Xuan Chen, Thomas Gehrmann, E. W. N. Glover, more

Journal of High Energy Physics > 2019 > 2019 > 2 > 1-33

Abstract We consider higher-order QCD corrections to Higgs boson production through gluon-gluon fusion in the large top quark mass limit in hadron collisions. We extend the transverse-momentum (q_T ) subtraction method to next-to-next-to-next-to-leading order (N³LO) and combine it with the NNLO Higgs-plus-jet calculation to numerically compute differential infrared-safe observables at N³LO for Higgs...

article

Combining QED and QCD transverse-momentum resummation for Z boson production at hadron colliders

Leandro Cieri, Giancarlo Ferrera, Germán F. R. Sborlini

Journal of High Energy Physics > 2018 > 2018 > 8 > 1-16

Abstract We consider the transverse-momentum (q_T) distribution of Z bosons produced in hadronic collisions. At small values of q_T, we perform the analytic resummation of the logarithmically enhanced QED contributions up to next-to-leading logarithmic accuracy, including the mixed QCD-QED contributions at leading logarithmic accuracy. Resummed results are consistently matched with the next-to-leading...

article

Master integrals for double real radiation emission in heavy-to-light quark decay

Roberto Bonciani, Alessandro Broggio, Leandro Cieri, Andrea Ferroglia

The European Physical Journal C > 2018 > 78 > 8 > 1-12

We evaluate analytically the master integrals for double real radiation emission in the $$b \rightarrow u W^*$$ b→uW∗ decay, where b and u are a massive and massless quark, respectively, while $$W^{*}$$ W∗ is an off-shell charged weak boson. Since the W boson can subsequently decay in a lepton anti-neutrino pair, the results of the present paper constitute a further step toward a fully analytic...

article

Diphoton production at the LHC: a QCD study up to NNLO

Stefano Catani, Leandro Cieri, Daniel Florian, Giancarlo Ferrera, more

Journal of High Energy Physics > 2018 > 2018 > 4 > 1-76

Abstract We consider the production of prompt-photon pairs at the LHC and we report on a study of QCD radiative corrections up to the next-to-next-to-leading order (NNLO). We present a detailed comparison of next-to-leading order (NLO) results obtained within the standard and smooth cone isolation criteria, by studying the dependence on the isolation parameters. We highlight the role of different...

article

Diphoton production at hadron colliders: transverse-momentum resummation at next-to-next-to-leading logarithmic accuracy

Leandro Cieri, Francesco Coradeschi, Daniel Florian

Journal of High Energy Physics > 2015 > 2015 > 6 > 1-22

Abstract We consider the transverse-momentum (q_T) distribution of a diphoton pair produced in hadron collisions. At small values of q_T, we resum the logarithmically-enhanced perturbative QCD contributions up to next-to-next-to-leading logarithmic accuracy. At intermediate and large values of q_T, we consistently combine resummation with the known next-to-leading order perturbative result. All perturbative...

article

Threshold resummation at N3LL accuracy and soft-virtual cross sections at N3LO

Stefano Catani, Leandro Cieri, Daniel de Florian, Giancarlo Ferrera, more

Nuclear Physics B > 2014 > 888 > C > 75-91

We consider QCD radiative corrections to the production of colorless high-mass systems in hadron collisions. We show that the recent computation of the soft-virtual corrections to Higgs boson production at N³LO [1] together with the universality structure of soft-gluon emission can be exploited to extract the general expression of the hard-virtual coefficient that contributes to threshold resummation...

article

Universality of transverse-momentum resummation and hard factors at the NNLO

Stefano Catani, Leandro Cieri, Daniel de Florian, Giancarlo Ferrera, more

Nuclear Physics, Section B > 2014 > 881 > Complete > 414-443

We consider QCD radiative corrections to the production of colorless high-mass systems in hadron collisions. The logarithmically-enhanced contributions at small transverse momentum are treated to all perturbative orders by a universal resummation formula that depends on a single process-dependent hard factor. We show that the hard factor is directly related to the all-order virtual amplitude of the...

article

Diphoton production at Next-to-Next-to-Leading-Order

Leandro Cieri

Nuclear Physics B (Proceedings Supplements) > 2013 > 234 > Complete > 29-32

We consider direct diphoton production in hadron collisions. We compute the next-to-next-to-leading order (NNLO) QCD radiative corrections at the fully-differential level. Our calculation uses the qT subtraction formalism and it is implemented in a parton level Monte Carlo program, which allows the user to apply arbitrary kinematical cuts on the final-state photons and the associated jet activity,...

article

Vector-boson production at hadron colliders: hard-collinear coefficients at the NNLO

Stefano Catani, Leandro Cieri, Daniel Florian, Giancarlo Ferrera, more

The European Physical Journal C > 2012 > 72 > 11 > 1-9

We consider QCD radiative corrections to vector-boson production in hadron collisions. We present the next-to-next-to-leading order (NNLO) result of the hard-collinear coefficient function for the all-order resummation of logarithmically enhanced contributions at small transverse momenta. The coefficient function controls NNLO contributions in resummed calculations at full next-to-next-to-leading...

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Search results for: Leandro Cieri

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