2,328 research outputs found

    QCD Factorization for heavy quarkonium production at collider energies

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    In this talk, I briefly review several models of the heavy quarkonium production at collider energies, and discuss the status of QCD factorization for these production models.Comment: 7 pages, 12 figures, Talk presented at the Conference on Quark Confinement and Hadron Spectrum VII, Ponta Delgada, Portugal, 2-7 September, 200

    Collinear factorization for deep inelastic scattering structure functions at large Bjorken xB

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    We examine the uncertainty of perturbative QCD factorization for hadron structure functions in deep inelastic scattering at a large value of the Bjorken variable xB. We analyze the target mass correction to the structure functions by using the collinear factorization approach in the momentum space. We express the long distance physics of structure functions and the leading target mass corrections in terms of parton distribution functions with the standard operator definition. We compare our result with existing work on the target mass correction. We also discuss the impact of a final-state jet function on the extraction of parton distributions at large fractional momentum x.Comment: 18 pages, 10 figures; discussion on baryon number conservation clarifie

    Heavy quarkonium production in hadronic collisions in TMD framework

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    Heavy quarkonium (Υ\Upsilon) production at low transverse momentum (PP_\perp) in high-energy hadronic collisions is revisited from the point of view of transverse momentum dependent (TMD) framework. We perform resummation of double logarithmic correction associated with initial-state soft gluon shower for bbˉb\bar b production by employing Collins-Soper-Sterman (CSS) formalism. We show that the CSS formalism provides a nice description of Υ\Upsilon production data in p+pˉ\rm\bar{p} collisions at Tevatron and p+p collisions at the LHC.Comment: 6 pages, 2 figures, proceedings of QCD Evolution 2017, 22-26 May 2017, Newport News, VA-US

    Novel Phenomenology of Parton Distributions from the Drell-Yan Process

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    The Drell-Yan massive lepton-pair production in hadronic collisions provides a unique tool complementary to the Deep-Inelastic Scattering for probing the partonic substructures in hadrons. We review key concepts, approximations, and progress for QCD factorization of the Drell-Yan process in terms of collinear or transverse momentum dependent (TMD) parton distribution functions. We present experimental results from recent fixed-target Drell-Yan as well as WW and ZZ boson production at colliders, focussing on the topics of flavor structure of the nucleon sea as well as the extraction of novel Sivers and Boer-Mulders functions via single transverse spin asymmetries and azimuthal lepton angular distribution of the Drell-Yan process. Prospects for future Drell-Yan experiments are also presented.Comment: 50 pages and 23 figures, and references added and minor typos correcte
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