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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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Journal ArticleDOI
TL;DR: In this paper, the authors present a study of lνband l + l − b production at hadron colliders, based on automatic matrix-element calculations performed by MadLoop and MadFKS, and are given at both the parton level, and after the matching with the Herwig event generator.
Abstract: We present a study of lνband l + l − bproduction at hadron colliders. Our re- sults, accurate to the next-to-leading order in QCD, are based on automatic matrix-element calculations performed by MadLoop and MadFKS, and are given at both the parton level, and after the matching with the Herwig event generator, achieved with aMC@NLO. We retain the complete dependence on the bottom-quark mass, and include exactly all spin correlations of final-state leptons. We discuss the cases of several observables at the LHC which highlight the importance of accurate simulations.

93 citations

Journal ArticleDOI
TL;DR: The Sivers transverse single spin asymmetry (TSSA) is calculated and compared at different scales using the transverse-momentum-dependent (TMD) evolution equations applied to previously existing extractions using the Collins-Soper-Sterman (CSS) formalism.
Abstract: In this letter, we show that it is necessary to include the full treatment of QCD evolution of Transverse Momentum Dependent parton densities to explain discrepancies between HERMES data and recent COMPASS data on a proton target for the Sivers transverse single spin asymmetry in Semi-Inclusive Deep Inelastic Scattering (SIDIS). Calculations based on existing fits to TMDs in SIDIS, and including evolution within the Collins-Soper-Sterman with properly defined TMD PDFs are shown to provide a good explanation for the discrepancy. The non-perturbative input needed for the implementation of evolution is taken from earlier analyses of unpolarized Drell-Yan (DY) scattering at high energy. Its success in describing the Sivers function in SIDIS data at much lower energies is strong evidence in support of the unifying aspect of the QCD TMD-factorization formalism.

92 citations

01 Oct 2006
TL;DR: The TeV4LHC QCD Working Group as mentioned in this paper focused on important aspects of QCD at hadron colliders: jet definitions, extraction and use of Parton distribution functions, the underlying event, Monte Carlo tunes, and diffractive physics.
Abstract: The experiments at Run 2 of the Tevatron have each accumulated over 1 fb{sup -1} of high-transverse momentum data. Such a dataset allows for the first precision (i.e. comparisons between theory and experiment at the few percent level) tests of QCD at a hadron collider. While the Large Hadron Collider has been designed as a discovery machine, basic QCD analyses will still need to be performed to understand the working environment. The Tevatron-for-LHC workshop was conceived as a communication link to pass on the expertise of the Tevatron and to test new analysis ideas coming from the LHC community. The TeV4LHC QCD Working Group focused on important aspects of QCD at hadron colliders: jet definitions, extraction and use of Parton Distribution Functions, the underlying event, Monte Carlo tunes, and diffractive physics. This report summarizes some of the results achieved during this workshop.

92 citations

Journal ArticleDOI
01 Feb 1997
TL;DR: Parton distribution functions give the probability to find partons (quarks and gluons) in a hadron as a function of the fraction η of the proton's momentum carried by the parton as mentioned in this paper.
Abstract: Parton distribution functions give the probability to find partons (quarks and gluons) in a hadron as a function of the fraction η of the proton's momentum carried by the parton. They are conventionally defined in terms of matrix elements of certain operators. They are determined from experimental results on short distance scattering of the partons. Integrals of these functions weighted with ηn are calculable using lattice QCD. Some simple models for their behavior have implications that could also be tested in lattice QCD.

92 citations

Journal ArticleDOI
TL;DR: In this paper, it was shown that the error due to unknown dynamical (higher-twist) corrections to the QCD parton model is small provided an isoscalar target is used.

92 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023384
2022897
2021410
2020423
2019472
2018424