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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 article, the role played in double-parton interactions by the parton correlations originating from perturbative QCD parton splittings was examined and the results of the numerical analysis of the integrated DPI cross sections at Tevatron and LHC energies.
Abstract: We examine the role played in double-parton interactions (DPI) by the parton–parton correlations originating from perturbative QCD parton splittings. Also presented are the results of the numerical analysis of the integrated DPI cross sections at Tevatron and LHC energies. To obtain the numerical results the knowledge of the single-parton GPDs gained by the HERA experiments was used to construct the non-perturbative input for generalized double-parton distributions. The perturbative two-parton correlations induced by three-parton interactions contribute significantly to a resolution of the longstanding puzzle of an excess of multi-jet production events in the back-to-back kinematics observed at the Tevatron.

139 citations

Journal ArticleDOI
TL;DR: In this article, the second-order QCD corrections to the production of a Higgs boson recoiling against a parton with finite transverse momentum are derived, working in the effective field theory in which the top quark contributions are integrated out.
Abstract: We derive the second-order QCD corrections to the production of a Higgs boson recoiling against a parton with finite transverse momentum, working in the effective field theory in which the top quark contributions are integrated out. To account for quark mass effects, we supplement the effective field theory result by the full quark mass dependence at leading order. Our calculation is fully differential in the final state kinematics and includes the decay of the Higgs boson to a photon pair. It allows one to make next-to-next-to-leading order (NNLO)-accurate theory predictions for Higgs-plus-jet final states and for the transverse momentum distribution of the Higgs boson, accounting for the experimental definition of the fiducial cross sections. The NNLO QCD corrections are found to be moderate and positive, they lead to a substantial reduction of the theory uncertainty on the predictions. We compare our results to 8 TeV LHC data from ATLAS and CMS. While the shape of the data is well-described for both experiments, we agree on the normalization only for CMS. By normalizing data and theory to the inclusive fiducial cross section for Higgs production, good agreement is found for both experiments, however at the expense of an increased theory uncertainty. We make predictions for Higgs production observables at the 13 TeV LHC, which are in good agreement with recent ATLAS data. At this energy, the leading order mass corrections to the effective field theory prediction become significant at large transverse momenta, and we discuss the resulting uncertainties on the predictions.

139 citations

Journal ArticleDOI
T. Ahmed1, S. Aid2, Vladimir Andreev, B. Andrieu3  +391 moreInstitutions (27)
TL;DR: In this paper, the H1 detector at HERA was used for a class of deep inelastic electron-proton scattering (DIS) events (5 < Q2 < 120 GeV2) at low Bjorken-x (10−4 < x < 10−2) which have almost no hadronic energy flow in a large interval of pseudo-rapidity around the proton remnant direction and which cannot be attributed to our present understanding of DIS and fluctuations in final state hadronic fragmentation.

139 citations

Journal Article
TL;DR: In this article, the authors give an account of the definitions of parton densities, both the conventional ones, integrated over parton transverse momentum, and the unintegrated transverse-momentum-dependent densities.
Abstract: I give an account of the definitions of parton densities, both the conventional ones, integrated over parton transverse momentum, and unintegrated transverse-momentum-dependent densities. The aim is to get a precise and correct definition of a parton density as the target expectation value of a suitable quantum mechanical operator, so that a clear connection to non-perturbative QCD is provided. Starting from the intuitive ideas in the parton model that predate QCD, we will see how the simplest operator definitions suffer from divergences. Corrections to the definition are needed to eliminate the divergences. An improved definition of unintegrated parton densities is proposed.

138 citations

Journal ArticleDOI
TL;DR: In this article, the authors present experimental knowledge and theoretical understanding of deep-inelastic scattering on nuclear targets, focusing mainly on nuclear coherence phenomena, such as shadowing, where the key physics issue is the exploration of hadronic and quark-gluon fluctuations of a high-energy virtual photon and their passage through the nuclear medium.

138 citations


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