Intrinsic transverse parton momenta in deeply inelastic reactions

Schweitzer, P.; Teckentrup, T.; Metz, Andreas

doi:10.1103/physrevd.81.094019

Cited by 129 publications

(202 citation statements)

References 176 publications

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“…A recent study [110] analyzed these data in combination with the CLAS data [111], and concluded that in the kinematics similar to the CLAS data, the Hall C data could be relatively well described by a Gaussian model with average transverse momentum width of 0.24 (GeV/c) 2 . The good description of the π ± cross sections from different targets was argued to indicate that the assumption of flavor-independent Gaussian width for both the transverse widths of quark and fragmentation functions was reasonable, in the valence-x region for z=0.…”

Section: E Nuclear Al/d Ratiosmentioning

confidence: 99%

Semi-inclusive charged-pion electroproduction off protons and deuterons: Cross sections, ratios, and access to the quark-parton model at low energies

Asaturyan¹,

Ent²,

Mkrtchyan³

et al. 2012

Phys. Rev. C

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A large set of cross sections for semi-inclusive electroproduction of charged pions (π ± ) from both proton and deuteron targets was measured. The data are in the deep-inelastic scattering region with invariant mass squared W 2 > 4 GeV 2 (up to ≈ 7 GeV 2 ) and range in four-momentum transfer squared 2 < Q 2 < 4 (GeV/c) 2 , and cover a range in the Bjorken scaling variable 0.2 < x < 0.6. The fractional energy of the pions spans a range 0.3 < z < 1, with small transverse momenta with respect to the virtual-photon direction, P 2 t < 0.2 (GeV/c) 2 . The invariant mass that goes undetected, Mx or W ′ , is in the nucleon resonance region, W ′ < 2 GeV. The new data conclusively show the onset of quark-hadron duality in this process, and the relation of this phenomenon to the high-energy factorization ansatz of electron-quark scattering and subsequent quark → pion production mechanisms. The x, z and P 2 t dependences of several ratios (the ratios of favored-unfavored fragmentation functions, charged pion ratios, deuteron-hydrogen and aluminum-deuteron ratios for π + and π − ) have been studied. The ratios are found to be in good agreement with expectations based upon a high-energy quark-parton model description. We find the azimuthal dependences to be small, as compared to exclusive pion electroproduction, and consistent with theoretical expectations based on tree-level factorization in terms of transverse-momentum-dependent parton distribution and fragmentation functions. In the context of a simple model, the initial transverse momenta of d quarks are found to be slightly smaller than for u quarks, while the transverse momentum width of the favored fragmentation function is about the same as for the unfavored one, and both fragmentation widths are larger than the quark widths.

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Section: E Nuclear Al/d Ratiosmentioning

confidence: 99%

Semi-inclusive charged-pion electroproduction off protons and deuterons: Cross sections, ratios, and access to the quark-parton model at low energies

Asaturyan¹,

Ent²,

Mkrtchyan³

et al. 2012

Phys. Rev. C

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“…ref. [50] for a study dedicated to this issue). The interpolation of a Gaussian with the small-b matching eqs.…”

Section: Jhep03(2017)002mentioning

confidence: 99%

Power corrections and renormalons in Transverse Momentum Distributions

Scimemi

Vladimirov

2017

J. High Energ. Phys.

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Abstract:We study the power corrections to Transverse Momentum Distributions (TMDs) by analyzing renormalon divergences of the perturbative series. The renormalon divergences arise independently in two constituents of TMDs: the rapidity evolution kernel and the small-b matching coefficient. The renormalon contributions (and consequently power corrections and non-perturbative corrections to the related cross sections) have a non-trivial dependence on the Bjorken variable and the transverse distance. We discuss the consistency requirements for power corrections for TMDs and suggest inputs for the TMD phenomenology in accordance with this study. Both unpolarized quark TMD parton distribution function and fragmentation function are considered.

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“…A linear dependence on s has been also claimed for DY and SIDIS in Ref. [5]. However the linearity is very rough and approximate.…”

Section: Gaussian Modelsmentioning

confidence: 86%

“…27 but with the parameters of Ref. [5], setting the initial scale, Q 0 , as the average Q of the HERMES experiment. However, despite these modifications, the description of the HERMES experiment (which is the input for the evolution) is very bad, see Fig.1 of Ref.…”

Section: Tmd/css Phenomenologymentioning

confidence: 99%

Phenomenology of TMDs

Melis

2015

EPJ Web of Conferences

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Abstract. We present a review of current Transverse Momentum Dependent (TMD) phenomenology focusing our attention on the unpolarized TMD parton distribution function and the Sivers function. The paper introduces and comments about the new Collins-Soper-Sterman (CSS) TMD evolution formalism [1]. We make use of a selection of results obtained by several groups to illustrate the achievements and the failures of the simple Gaussian approach and the TMD CSS evolution formalism.

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Intrinsic transverse parton momenta in deeply inelastic reactions

Cited by 129 publications

References 176 publications

Semi-inclusive charged-pion electroproduction off protons and deuterons: Cross sections, ratios, and access to the quark-parton model at low energies

Semi-inclusive charged-pion electroproduction off protons and deuterons: Cross sections, ratios, and access to the quark-parton model at low energies

Power corrections and renormalons in Transverse Momentum Distributions

Phenomenology of TMDs

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