Azimuthal single spin asymmetries in SIDIS in the light of chiral symmetry breaking

Schweitzer, P.; Bacchetta, Alessandro

doi:10.1016/j.nuclphysa.2003.12.010

Cited by 24 publications

(22 citation statements)

References 88 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

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“…The kaon Collins function is at the moment unknown. A few model calculations of the Collins function for pions have been presented in the literature [8,9,10,11,12] and used to make predictions and/or compare to available data [10,13,14,15]. However, the above calculations have been found to be inadequate to describe the data.…”

Section: Introductionmentioning

confidence: 99%

Collins fragmentation function for pions and kaons in a spectator model

et al. 2008

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We calculate the Collins fragmentation function in the framework of a spectator model with pseudoscalar pion-quark coupling and a Gaussian form factor at the vertex. We determine the model parameters by fitting the unpolarized fragmentation function for pions and kaons. We show that the Collins function for the pions in this model is in reasonable agreement with recent parametrizations obtained by fits of the available data. In addition, we compute for the first time the Collins function for the kaons.

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“…A lively discussion is ongoing in this field in order to correctly interpret the available data for both hadronic collisions and semi-inclusive DIS (see, for example, Refs. [42,45,46,47,48,49]). …”

mentioning

confidence: 99%

Dihadron interference fragmentation functions in proton-proton collisions

Bacchetta¹,

Radici²

2004

Phys. Rev. D

151

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We study the production of hadron pairs in proton-proton collisions, selecting pairs with large total transverse momentum with respect to the beam, and small relative transverse momentum, i.e., belonging to a single jet with large transverse momentum. We describe the process in terms of dihadron fragmentation functions. We consider the production of one pair in polarized collisions (with one transversely polarized proton) and the production of two pairs in unpolarized collisions. In the first case, we discuss how to observe the quark transversity distribution in connection with a specific class of dihadron fragmentation functions, named interference fragmentation functions. In the second case, we suggest how to determine the latter and also how to observe linearly polarized gluons.

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Azimuthal single spin asymmetries in SIDIS in the light of chiral symmetry breaking

Cited by 24 publications

References 88 publications

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

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

Collins fragmentation function for pions and kaons in a spectator model

Dihadron interference fragmentation functions in proton-proton collisions

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