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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.


Papers
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Journal ArticleDOI
TL;DR: Based on perturbative QCD, the parton fragmentation picture of hadronic interactions is reviewed in this paper, where the authors propose a perturbation-based QCD-based model of the hadronic interaction.
Abstract: Based on perturbative QCD, the parton fragmentation picture of hadronic interactions is reviewed. (AIP)

127 citations

Journal ArticleDOI
TL;DR: In this paper, a new parametrization of the parton distribution functions is adopted by taking into account the positivity and the counting rule, and the polarized distribution functions of u and d valence quarks, sea quarks and gluon are determined by using world data from the longitudinally polarized deep inelastic scattering experiments.
Abstract: Polarized parton distribution functions are determined by using world data from the longitudinally polarized deep inelastic scattering experiments. A new parametrization of the parton distribution functions is adopted by taking into account the positivity and the counting rule. From the fit to the asymmetry data A_1, the polarized distribution functions of u and d valence quarks, sea quarks, and gluon are obtained. The results indicate that the quark spin content is \Delta\Sigma=0.20 and 0.05 in the leading order (LO) and the next-to-leading-order (NLO) MS-bar scheme, respectively. However, if x dependence of the sea-quark distribution is fixed at small x by "perturbative QCD" and Regge theory, it becomes \Delta \Sigma=0.24 ~ 0.28 in the NLO. The small-x behavior cannot be uniquely determined by the existing data, which indicates the importance of future experiments. From our analysis, we propose one set of LO distributions and two sets of NLO ones as the longitudinally-polarized parton distribution functions.

127 citations

Journal ArticleDOI
Carmen Albajar1, Michael Albrow, O. C. Allkofer, A. Astbury  +184 moreInstitutions (6)
TL;DR: In this article, the production of transverse energy clusters in minimum bias proton-antiproton collisions at the CERN SPS Collider is studied with the UA1 detector over a new range of centre of mass energies (√ s = 0.2−0.9 TeV).

127 citations

Journal ArticleDOI
TL;DR: In this paper, a QCD model for e+e− annihilation is presented, and its consequences are compared with experimental data, which involves production of a shower of partons described by a simple approximation to QCD perturbation theory, and decay of colour singlet clusters of produced partons into hadrons through a simple phase space process.

127 citations

Journal ArticleDOI
TL;DR: In this article, variations in the definitions, at next-to-leading order and at nextto-next-to leading order, of a general-mass variable flavor number scheme (GM-VFNS) for heavy flavor structure functions are considered.
Abstract: I consider variations in the definitions, at next-to-leading order and at next-to-next-to leading order, of a general-mass variable flavor number scheme (GM-VFNS) for heavy flavor structure functions. I also define a new ``optimal'' scheme choice improving the smoothness of the transition from one flavor number to the next. I investigate the variation of the structure function for a fixed set of parton distribution functions (PDFs) and also the change in the PDFs when a new MSTW2008-type global fit to data is performed for each GM-VFNS. At next-to-leading order the parton distributions, and predictions using them at hadron colliders, can vary by $\ensuremath{\sim}2--3%$ from the mean value. At next-to-next-to leading order there is far more stability with varying GM-VFNS definitions, and changes in PDFs and predictions are less than 1%, with most variations at very small $x$ values. Hence, mass-scheme variation is an additional and significant source of uncertainty when considering parton distributions, but as with all perturbative uncertainties, it diminishes quickly as higher orders are included.

127 citations


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