616 citations · 2.3k across the 30 of their papers we have counts for
18 papers · 1 filter
On the polarization of the non-prompt contribution to inclusive J/ production in pp collisions
Pietro Faccioli, Carlos Lourenço
Of the J/ mesons (inclusively) produced in pp collisions, a big fraction results from B decays, increasing with transverse momentum and exceeding 50\% for GeV.…
From prompt to direct J/ production: new insights on the and polarizations and feed-down contributions from a global-fit analysis of mid-rapidity LHC data
Pietro Faccioli, Carlos Lourenço, Thomas Madlener
While the prompt J/ cross section and polarization have been measured with good precision as a function of transverse momentum, , those of the directly produced J/…
NRQCD colour-octet expansion vs LHC quarkonium production: signs of a hierarchy puzzle?
Pietro Faccioli, Carlos Lourenco
The observation of unpolarized quarkonium production in high energy pp collisions, at mid rapidity, implies a significant violation of the non-relativistic QCD (NRQCD) velocity sca…
The fate of quarkonia in heavy-ion collisions at LHC energies: a unified description of the sequential suppression patterns
Pietro Faccioli, Carlos Lourenco
Measurements made at the LHC have shown that the production of the , (2S), (1S) and (2S) quarkonia is suppressed in Pb-Pb collisions, with respect to the extrap…
From identical S- and P-wave pT/M spectra to maximally distinct polarizations: probing NRQCD with chi states
Pietro Faccioli, Carlos Lourenco, Mariana Araujo +3
A global analysis of ATLAS and CMS measurements reveals that, at mid-rapidity, the directly-produced , and J/ mesons have differential cross sections of seeming…
Universal kinematic scaling as a probe of factorized long-distance effects in high-energy quarkonium production
Pietro Faccioli, Carlos Lourenco, Mariana Araujo +1
Dimensional analysis reveals general kinematic scaling rules for the momentum, mass, and energy dependence of Drell-Yan and quarkonium cross sections. Their application to mid-rapi…
Quarkonium production at the LHC: a data-driven analysis of NRQCD's predictions
Pietro Faccioli, Mariana Araújo, Valentin Knünz +3
While non-relativistic QCD (NRQCD) foresees a variety of elementary quarkonium production mechanisms naturally leading to state-dependent kinematic patterns, the LHC cross sections…
Quarkonium production at the LHC: a phenomenological analysis of surprisingly simple data patterns
Pietro Faccioli, Mariana Araújo, Valentin Knünz +3
The LHC quarkonium production measurements reveal a startling observation: the J/, (2S), and (nS) -differential cross sections are compatible with on…
Quarkonium production in the LHC era: a polarized perspective
Pietro Faccioli, Valentin Knuenz, Carlos Lourenco +2
Polarization measurements are usually considered as the most difficult challenge for the QCD description of quarkonium production. In fact, global data fits for the determination o…
Minimal physical constraints on the angular distributions of two-body boson decays
Pietro Faccioli, Carlos Lourenco, Joao Seixas +1
The angular distribution of the two-body decay of a boson of unknown properties is strongly constrained by angular momentum conservation and rotation invariance, as well as by the…
Quarkonium production in high energy proton-proton and proton-nucleus collisions
Z. Conesa del Valle, G. Corcella, F. Fleuret +13
We present a brief overview of the most relevant current issues related to quarkonium production in high energy proton-proton and proton-nucleus collisions along with some perspect…
Towards the experimental clarification of quarkonium polarization
Pietro Faccioli, Carlos Lourenco, Joao Seixas +1
We highlight issues which are often underestimated in the experimental analyses on quarkonium polarization: the relation between the parameters of the angular distributions and the…
A new approach to quarkonium polarization studies
Pietro Faccioli, Carlos Lourenco, Joao Seixas
Significant progress in understanding quarkonium production requires improved polarization measurements, fully considering the intrinsic multidimensionality of the problem. We prop…
Rotation-invariant relations in vector meson decays into fermion pairs
Pietro Faccioli, Carlos Lourenco, Joao Seixas
The rotational properties of angular momentum eigenstates imply the existence of a frame-independent relation among the parameters of the decay distribution of vector mesons into f…
Heavy Quarkonium Physics
N. Brambilla, M. Krämer, R. Mussa +82
This report is the result of the collaboration and research effort of the Quarkonium Working Group over the last three years. It provides a comprehensive overview of the state of t…
A microscopic calculation of secondary Drell-Yan production in heavy ion collisions
C. Spieles, L. Gerland, N. Hammon +6
A study of secondary Drell-Yan production in nuclear collisions is presented for SPS energies. In addition to the lepton pairs produced in the initial collisions of the projectile…
Hard probes in nucleus-nucleus collisions
C. Lourenco
The present knowledge on hard processes in the context of heavy ion collisions is reviewed, with particular emphasis on J/psi production. The p-A data on charmonia production from…
A Quantitative Analysis of Charmonium Suppression in Nuclear Collisions
D. Kharzeev, C. Lourenco, M. Nardi +1
Data from J/psi and psi' production in p-A collisions are used to determine the cross section for absorption of pre-resonance charmonium in nuclear matter. The J/psi suppression in…