Topic
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 article, the inclusion of single and double differential crosssections for neutral and charged current processes with four-momentum transfer squared Q^2 between 150 and 30,000 GeV2 and with Bjorken x between 0.0032 and 0.65 are measured in e^+ p collisions.
Abstract: The inclusive single and double differential cross-sections for neutral and charged current processes with four-momentum transfer squared Q^2 between 150 and 30,000 GeV2 and with Bjorken x between 0.0032 and 0.65 are measured in e^+ p collisions. The data were taken with the H1 detector at HERA between 1994 and 1997, and they correspond to an integrated luminosity of 35.6 pb^-1. The Q^2 evolution of the parton densities of the proton is tested, yielding no significant deviation from the prediction of perturbative QCD. The proton structure function F_2(x,Q^2) is determined. An extraction of the u and d quark distributions at high x is presented. At high Q^2 electroweak effects of the heavy bosons Z0 and W are observed and found to be consistent with Standard Model expectation.
113 citations
TL;DR: In this article, the authors parametrize new physics by model-independent dimension-6 eective operators, and study their tests via Higgs pair production at hadron colliders.
Abstract: Despite the discovery of a Higgs boson h(125 GeV) at the LHC Run-1, its self-interaction has fully evaded direct experimental probe so far. Such self-interaction is vital for electroweak symmetry breaking, vacuum stability, electroweak phase transition, and Higgs ination. It is a most likely place to encode new physics beyond the standard model. We parametrize such new physics by model-independent dimension-6 eective operators, and study their tests via Higgs pair production at hadron colliders. We analyze three major di-Higgs production channels at parton level, and compare the parameter-dependence of total cross sections and kinematic distributions at the LHC (14TeV) and pp(100TeV) hadron collider. We further perform full simulations for the diHiggs production channel gg ! hh ! b b and its backgrounds at the pp (100TeV) hadron collider. We construct four kinds of benchmark points, and study the sensitivities to probing dierent regions of the parameter space of cubic Higgs interactions. We nd that for one-parameter
113 citations
TL;DR: In this paper, the authors provide a proper definition of all the leading-twist (un)polarized gluon transverse momentum dependent parton distribution functions (TMDPDFs), by considering the Higgs boson transversal momentum distribution in hadron-hadron collisions and derive the factorization theorem in terms of them.
Abstract: We provide the proper definition of all the leading-twist (un)polarized gluon transverse momentum dependent parton distribution functions (TMDPDFs), by considering the Higgs boson transverse momentum distribution in hadron-hadron collisions and deriving the factorization theorem in terms of them. We show that the evolution of all the (un)polarized gluon TMDPDFs is driven by a universal evolution kernel, which can be resummed up to next-to-next-to-leading-logarithmic accuracy. Considering the proper definition of gluon TMDPDFs, we perform an explicit next-to-leading-order calculation of the unpolarized (f
1
), linearly polarized (h
1
⊥
) and helicity (g
1
) gluon TMDPDFs, and show that, as expected, they are free from rapidity divergences. As a byproduct, we obtain the Wilson coefficients of the refactorization of these TMDPDFs at large transverse momentum. In particular, the coefficient of g
1
, which has never been calculated before, constitutes a new and necessary ingredient for a reliable phenomenological extraction of this quantity, for instance at RHIC or the future AFTER@LHC or Electron-Ion Collider. The coefficients of f
1
and h
1
⊥
have never been calculated in the present formalism, although they could be obtained by carefully collecting and recasting previous results in the new TMD formalism. We apply these results to analyze the contribution of linearly polarized gluons at different scales, relevant, for instance, for the inclusive production of the Higgs boson and the C-even pseudoscalar bottomonium state η
b
. Applying our resummation scheme we finally provide predictions for the Higgs boson q
T
-distribution at the LHC.
113 citations
TL;DR: The full analytic result of the quark contribution to F/sub L/(x,Q/sup 2/) up to next-to-leading order is presented and the phenomenological implications are discussed for the large-x region.
Abstract: The full analytic result of the quark contribution to F/sub L/(x,Q/sup 2/) up to next-to-leading order is presented. The phenomenological implications are discussed for the large-x region, where gluons are not supposed to be relevant but other effects, such as higher twist, have to be included.
113 citations
TL;DR: In this paper, a QCD model for leptoproduction of heavy quarks based on gluon dissociation is presented, and rates for charm and heavier quark production are calculated and inclusive distributions are compared with dimuon data.
113 citations