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Parton
About: Parton is a research topic. Over the lifetime, 13484 publications have been published within this topic receiving 368877 citations.
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TL;DR: In this paper, the Drell-Yan process is used to measure the transverse spin polarization distribution of quarks in a proton, which contributes at leading twist to the angular distribution of lepton pair production in doubly polarized proton-proton collisions.
Abstract: The transverse spin polarization distribution of quarks in a proton contributes at leading twist to the angular distribution of lepton pair production in doubly polarized proton-proton collisions. Although this distribution is straightforward to define in the QCD-improved parton model and represents a fundamental quark degree of freedom, it has never been measured. Moreover, deeply inelastic electroproduction experiments are only sensitive to this distribution at the higher twist level, and then mix this contribution with others, including the one coming from multiparton initial states. Reviewing this, we conclude that the Drell-Yan process is the best way to measure the quark transverse spin polarization distribution.
99 citations
TL;DR: In this article, the authors use Regge phenomenology in combination with perturbative quantum chromodynamics to estimate that a substantial fraction (perhaps 30%) of all hard scattering events are diffractive.
99 citations
TL;DR: The results strongly support energy loss as a dominant effect in quarkonium suppression and give some hint on its hadroproduction mechanism suggesting color neutralization to happen on long time scales.
Abstract: The effects of energy loss in cold nuclear matter on J/ψ suppression in p-A collisions are studied. A simple model based on first principles and depending on a single free parameter is able to reproduce J/ψ suppression data at large x(F) and at various center-of-mass energies. These results strongly support energy loss as a dominant effect in quarkonium suppression. They also give some hint on its hadroproduction mechanism suggesting color neutralization to happen on long time scales. Predictions for J/ψ and Υ suppression in p-Pb collisions at the LHC are made.
99 citations
TL;DR: In this paper, a complete list of quarkparton model relations among deep inelastic lepton-nucleon scattering processes is given, to be compared with forthcoming neutrino and anti-neutrino data.
99 citations
TL;DR: In this article, the antenna subtraction framework has been successfully applied to the calculation of NNLO corrections to the 3-jet cross section and related event shape distributions in electron-positron annihilation.
Abstract: We use the antenna subtraction method to isolate the double real radiation infrared singularities present in gluonic scattering amplitudes at next-to-next-to-leading order. The antenna subtraction framework has been successfully applied to the calculation of NNLO corrections to the 3-jet cross section and related event shape distributions in electron-positron annihilation. Here we consider processes with two coloured particles in the initial state, and in particular two-jet production at hadron colliders such as the Large Hadron Collider (LHC). We construct a subtraction term that describes the single and double unresolved contributions from the six-gluon tree-level process using antenna functions with initial state partons and show numerically that the subtraction term correctly approximates the matrix elements in the various single and double unresolved configurations.
99 citations