Transverse spin effects of sea quarks in unpolarized nucleons

Lü, Zhun; Qiang, Bo; Schmidt, Iván

doi:10.1103/physrevd.75.014026

Cited by 20 publications

(20 citation statements)

References 54 publications

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“…However, if intrinsic transverse parton motion in the initial state is taken into account the Boer-Mulders function h ⊥ 1 contributes to the cos 2φ term according to (92) which may explain the observed violation of the Lam-Tung relation [33]. This finding stimulated a lot of phenomenological work on this subject [11,33,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80].…”

Section: Leading Spin Observablesmentioning

confidence: 99%

Dilepton production from polarized hadron hadron collisions

2009

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In this paper we present a comprehensive formalism for dilepton production from the collision of two polarized spin-1 2 hadrons by identifying the general angular distribution of the cross section in combination with a complete set of structure functions. The various structure functions are computed in the parton model approximation where we mainly consider the case when the transverse momentum of the dilepton pair is much smaller than its invariant mass. In this kinematical region dilepton production can be described in terms of transverse momentum dependent parton distributions.

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Section: Leading Spin Observablesmentioning

confidence: 99%

Dilepton production from polarized hadron hadron collisions

2009

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“…A new suggestion (Lu et al, 2006(Lu et al, , 2007 is to make use of the cos 2φ dependence in unpolarized Drell-Yan scattering to measure the flavor dependence of the Boer-Mulders structure function for both quarks and antiquarks. In order to measure the quark (antiquark) distribution, a pion (proton) beam on both hydrogen and deuteron targets is proposed to perform the flavor separation.…”

Section: F Azimuthal Asymmetriesmentioning

confidence: 99%

Nucleon and pion distribution functions in the valence region

2010

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We provide an experimental and theoretical perspective on the behavior of unpolarized distribution functions for the nucleon and pion on the valence-quark domain; namely, Bjorken-x > ∼ 0.4. This domain is key to much of hadron physics; e.g., a hadron is defined by its flavor content and that is a valence-quark property. Furthermore, its accurate parametrization is crucial to the provision of reliable input for large collider experiments. We focus on experimental extractions of distribution functions via electron and muon inelastic scattering, and from Drell-Yan interactions; and on theoretical treatments that emphasize an explanation of the distribution functions, providing an overview of major contemporary approaches and issues. Valence-quark physics is a compelling subject, which probes at the heart of our understanding of the Standard Model. There are numerous outstanding and unresolved challenges, which experiment and theory must confront. In connection with experiment, we explain that an upgraded Jefferson Lab facility is well-suited to provide new data on the nucleon, while a future electron ion collider could provide essential new data for the mesons. There is also great potential in using Drell-Yan interactions, at FNAL, J-PARC and GSI, to push into the large-x domain for both mesons and nucleons. We argue furthermore that explanation, in contrast to modeling and parametrization, requires a widespread acceptance of the need to adapt theory: to the lessons learnt already from the methods of nonperturbative quantum field theory; and a fuller exploitation of those methods. * Electronic address: holt@anl.gov † Electronic address: cdroberts@anl.gov

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“…As proposed by Boer [10], the non-zero cos 2φ term can be produced by the product of two h ⊥ 1 s, each coming from one of the two incident hadrons. In the case of the p + D Drell-Yan processes, the coefficient ν can be expressed as [31] …”

Section: Extracting the Boer-mulders Function From Unpolarized P mentioning

confidence: 99%

“…The reason is that in processes in which the Boer-Mulders function contributes, one finds that it is always convoluted with itself or with other chiral-odd functions, such as the transversity or the Collins fragmentation function [27]. Despite this, some theoretical calculations and phenomenological analysis [12,28,29,30,31,32,33,34,35,36,37,38] have been performed on h ⊥ 1 . An interesting problem is its flavor dependence [39].…”

Section: Introductionmentioning

confidence: 99%

Extracting Boer-Mulders functions fromp+DDrell-Yan processes

et al. 2008

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We extract the Boer-Mulders functions of valence and sea quarks in the proton from unpolarized p + D DrellYan data measured by the FNAL E866 Collaboration. Using these Boer-Mulders functions, we calculate the cos 2φ asymmetries in unpolarized pp Drell-Yan processes, both for the FNAL E866/NuSea and the BNL Relativistic Heavy Ion Collider (RHIC) experiments. We also estimate the cos 2φ asymmetries in the unpolarized pp Drell-Yan processes at GSI.

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Transverse spin effects of sea quarks in unpolarized nucleons

Cited by 20 publications

References 54 publications

Dilepton production from polarized hadron hadron collisions

Dilepton production from polarized hadron hadron collisions

Nucleon and pion distribution functions in the valence region

Extracting Boer-Mulders functions fromp+DDrell-Yan processes

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