Single spin asymmetry in inclusive pion production, Collins effect and the string model

Artru, X.; Czyzewski, J.; Yabuki, Haruichi

doi:10.1007/s002880050342

Cited by 76 publications

(103 citation statements)

References 24 publications

(39 reference statements)

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“…We already said in section 3 that in the orbiting valence quark model one would get a zero SSA for K − . This would also be the case for the Collins effect in the model of Artru [128], because the specific Lund string model utilized gives a vanishing Collins function for subleading fragmentation. On the other hand the Sivers effect, involving unpolarized TMD fragmentation functions, would give a positive and, depending on the FF set adopted, sizable SSA [125].…”

Section: Pion Kaon and Heavy Meson Productionmentioning

confidence: 99%

“…(12), that is a pQCD inspired formula, the authors of Ref. [128] adopted a partonic spin-transfer D N N equal to one (as it is for very small scattering angles) and a simple power-like p Tdependent partonic cross-section based on the observed inclusive pion spectra. By assuming that the transverse polarization of the u and d quarks in the proton are +1 and −1 at x = 1, respectively, they obtained qualitative agreement with the E704 data, although underestimating their size.…”

Section: Parton Model Approaches Including Intrinsic Transverse Motionmentioning

confidence: 99%

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Azimuthal and single spin asymmetries in hard scattering processes

D’Alesio

Murgia

2008

Progress in Particle and Nuclear Physics

181

100

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In this article we review the present understanding of azimuthal and single spin asymmetries for inclusive and semi-inclusive particle production in unpolarized and polarized hadronic collisions at high energy and moderately large transverse momentum. After summarizing the experimental information available, we discuss and compare the main theoretical approaches formulated in the framework of perturbative QCD. We then present in some detail a generalization of the parton model with inclusion of spin and intrinsic transverse momentum effects. In this context, we extensively discuss the phenomenology of azimuthal and single spin asymmetries for several processes in different kinematical configurations. A comparison with the predictions of other approaches, when available, is also given. We finally emphasize some relevant open points and challenges for future theoretical and experimental investigation.

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Section: Pion Kaon and Heavy Meson Productionmentioning

confidence: 99%

Section: Parton Model Approaches Including Intrinsic Transverse Motionmentioning

confidence: 99%

Azimuthal and single spin asymmetries in hard scattering processes

D’Alesio

Murgia

2008

Progress in Particle and Nuclear Physics

181

100

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show abstract

“…Comparing asymmetries in vector and pseudoscalar meson production can provide information on the magnitude of the asymmetry in quark scattering [23]. If the asymmetry is generated only during the fragmentation of polarized quarks [20], the asymmetry of ρ mesons is expected to be opposite in sign to that of pions,…”

Section: Single Spin Asymmetriesmentioning

confidence: 99%

Summary of physics prospects for polarized nucleon-nucleon scattering at -

Коротков¹,

Nowak²

1997

Nuclear Physics A

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The physics scope of polarized nucleon-nucleon collisions originating from an internal polarized target in the HERA proton beam is summarized. Based on 240 pb −1 integrated luminosity at 40 GeV c.m. energy, statistical sensitivities are given over a wide (x F , p T )-range for a variety of inclusive and exclusive final states. By measuring single spin asymmetries unique information can be obtained on higher twist contributions and their p T -dependence. From double spin asymmetries in both photon and J/ψ production it appears possible to measure the polarized gluon distribution in the range 0.1 ≤ x gluon ≤ 0.4 with a good statistical accuracy. Drell-Yan pair production asymmetries in doubly longitudinal mode, measurable in the mass range 3÷10 GeV, allow discrimination between different parametrizations of the polarized light sea quark distributions. In doubly transverse mode access to the quark transversity distribution might become possible. Statistically significant results can be expected in the elastic channel.

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“…For K + , the observed moment is negative, which, e.g., in the framework of the Artru model [10], can be explained by equal-sign Collins fragmentation functions for u → π + and u → K + . However, also a contribution from sea quarks can play a role in the observed K + moment, which is of larger magnitude than the π + moment.…”

Section: -P4mentioning

confidence: 99%

Selected HERMES results on semi-inclusive meson production

Hulse

2012

EPJ Web of Conferences

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Abstract.The HERMES experiment at DESY in Hamburg collected semi-inclusive deep-inelastic scattering data using the 27.6 GeV HERA lepton beam and various gaseous light and nuclear targets. Results of charge-separated hadron-identified multiplicities and multiplicity ratios, measured on light and heavier targets, are shown as well as azimuthal moments measured from unpolarized hydrogen and deuterium targets. Furthermore, Sivers and Collins amplitudes, extracted from measurements on a transversely polarized hydrogen target, are presented.

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Single spin asymmetry in inclusive pion production, Collins effect and the string model

Cited by 76 publications

References 24 publications

Azimuthal and single spin asymmetries in hard scattering processes

Azimuthal and single spin asymmetries in hard scattering processes

Summary of physics prospects for polarized nucleon-nucleon scattering at -

Selected HERMES results on semi-inclusive meson production

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