Transversity distribution in spin asymmetries in semi-inclusive DIS and in the Drell-Yan process

Ефремов, А. В.; Goeke, K.; Schweitzer, P.

doi:10.1007/bf03032004

Cited by 14 publications

(15 citation statements)

References 53 publications

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“…A good illustration of this point is that in spite of the enormous dedicated theoretical and phenomenological effort [396,397,465,535,536,537,538,539,540,541,542,543,544,545,546,547,548,549,550,551,552,553,554,555] to explain the first single spin phenomena in SIDIS, A sin φ U L and A sin φ LU , these observables are still not understood. The theoretical challenge is that presently it is not understood how to control light-cone divergences in SIDIS at 1/Q order [555].…”

Section: Subleading-twist Tmdsmentioning

confidence: 99%

Gluons and the quark sea at high energies: distributions, polarization, tomography

Boer¹,

Diehl²,

Milner³

et al. 2011

198

291

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ForewordThe study of the fundamental structure of nuclear matter is a central thrust of physics research in the United States. As indicated in Frontiers of Nuclear Science, the 2007 Nuclear Science Advisory Committee long range plan, consideration of a future Electron-Ion Collider (EIC) is a priority and will likely be a significant focus of discussion at the next long range plan. We are therefore pleased to have supported the ten week program in fall 2010 at the Institute of Nuclear Theory which examined at length the science case for the EIC. This program was a major effort; it attracted the maximum allowable attendance over ten weeks.This report summarizes the current understanding of the physics and articulates important open questions that can be addressed by an EIC. It converges towards a set of "golden" experiments that illustrate both the science reach and the technical demands on such a facility, and thereby establishes a firm ground from which to launch the next phase in preparation for the upcoming long range plan discussions. We thank all the participants in this productive program. In particular, we would like to acknowledge the leadership and dedication of the five co-organizers of the program who are also the co-editors of this report.David Kaplan, Director, National Institute for Nuclear Theory Hugh Montgomery, Director, Thomas Jefferson National Accelerator Facility Steven Vigdor, Associate Lab Director, Brookhaven National Laboratory iii Preface This volume is based on a ten-week program on "Gluons and the quark sea at high energies", which took place at the Institute for Nuclear Theory (INT) in Seattle from September 13 to November 19, 2010. The principal aim of the program was to develop and sharpen the science case for an Electron-Ion Collider (EIC), a facility that will be able to collide electrons and positrons with polarized protons and with light to heavy nuclei at high energies, offering unprecedented possibilities for in-depth studies of quantum chromodynamics. Guiding questions were• What are the crucial science issues?• How do they fit within the overall goals for nuclear physics?• Why can't they be addressed adequately at existing facilities?• Will they still be interesting in the 2020's, when a suitable facility might be realized?The program started with a five-day workshop on "Perturbative and Non-Perturbative Aspects of QCD at Collider Energies", which was followed by eight weeks of regular program and a concluding four-day workshop on "The Science Case for an EIC".More than 120 theorists and experimentalists took part in the program over ten weeks. It was only possible to smoothly accommodate such a large number of participants because of the extraordinary efforts of the INT staff, to whom we extend our warm thanks and appreciation. We thank the INT Director, David Kaplan, for his strong support of the program and for covering a significant portion of the costs for printing this volume. We gratefully acknowledge additional financial support provided by BNL and JLab.The program w...

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Section: Subleading-twist Tmdsmentioning

confidence: 99%

Gluons and the quark sea at high energies: distributions, polarization, tomography

Boer¹,

Diehl²,

Milner³

et al. 2011

198

291

View full text Add to dashboard Cite

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“…The results (10,11) are unexpected from the point of view of studies [33,[60][61][62][63] of longitudinal SSA [28,29]. In order to understand these data it was sufficient to assume favoured flavour fragmentation only and to neglect H ⊥unf 1 completely, see [63] for a review.…”

Section: Collins Effect In Sidismentioning

confidence: 99%

Collins effect in semiinclusive deeply inelastic scattering and in electron-positron-annihilation

2006

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1 Previously, the preliminary result [15] and longitudinal target SSA [28][29][30][31] data were used to extract H ⊥ 1 from SIDIS [32,33]. However, in these studies twist-3 effects [34] were not or only partially considered. Still earlier attempts to learn about the Collins effect from SSA in the hadronic processespp ↑ or pp ↑ → πX [35] were made in [36], but recent studies indicate that the Collins effect is not likely to be the dominant source of SSA in these processes [37] as it was assumed in [36].

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“…Many models for the transverse momentum dependence of distribution and fragmentation functions were considered in literature [26][27][28][29][30][31][33][34][35]. Among the most popular models is the Gaussian ansatz, which has two important virtues.…”

Section: Sivers Effect In Sidismentioning

confidence: 99%

“…In the transverse target SSA these effects can be distinguished by the different azimuthal angle distribution of the produced hadrons: Sivers effect ∝ sin(φ − φ S ), while Collins effect ∝ sin(φ + φ S ), where φ and φ S denote respectively the azimuthal angles of the produced hadron and the target polarization vector with respect to the axis defined by the hard virtual photon [15]. Both effects have been subject to intensive phenomenological studies in hadron-hadron-collisions [21][22][23][24][25] and in SIDIS [26][27][28][29][30][31][32][33][34][35]. For the longitudinal target SSA in SIDIS, which were observed first [4][5][6] but are dominated by subleading-twist effects [36], the situation is less clear and their description (presuming the factorization theorems [12][13][14] can be generalized to twist-3) is more involved [37,38].…”

Section: Introductionmentioning

confidence: 99%

Sivers effect in semiinclusive deeply inelastic scattering

et al. 2006

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The Sivers function is extracted from HERMES data on single spin asymmetries in semi-inclusive deeply inelastic scattering. Our analysis use a simple Gaussian model for the distribution of transverse parton momenta, together with the flavor dependence given by the leading 1/Nc approximation and a neglect of the Sivers antiquark distribution. We find that within the errors of the data these approximations are sufficient.

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Transversity distribution in spin asymmetries in semi-inclusive DIS and in the Drell-Yan process

Cited by 14 publications

References 53 publications

Gluons and the quark sea at high energies: distributions, polarization, tomography

Gluons and the quark sea at high energies: distributions, polarization, tomography

Collins effect in semiinclusive deeply inelastic scattering and in electron-positron-annihilation

Sivers effect in semiinclusive deeply inelastic scattering

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