Quark dynamics of polarization in inclusive hadron production

DeGrand, Thomas; Miettinen, H.I.

doi:10.1103/physrevd.23.1227

Cited by 68 publications

(28 citation statements)

References 10 publications

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“…The Λ polarisation is attributed to some mechanism, based on semi-classical arguments [24,25] or inspired by QCD [26], by which produced strange quarks acquire a large negative polarisation. Recently a new approach to this problem based on perturbative QCD and its factorisation theorems, and which includes spin and transverse momentum of hadrons in the quark fragmentation, was proposed in [27].…”

Section: Spin Asymmetries In Hyperon Productionmentioning

confidence: 99%

Spin physics with antiprotons

Maggiora¹,

Abazov²,

Alexeev³

et al. 2005

Czech J Phys

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New possibilities arising from the availability at GSI of antiproton beams, possibly polarised, are discussed. The investigation of the nucleon structure can be boosted by accessing in Drell-Yan processes experimental asymmetries related to cross-sections in which the parton distribution functions (PDF) only appear, without any contribution from fragmentation functions; such processes are not affected by the chiral suppression of the transversity function h1(x). Spin asymmetries in hyperon production and Single Spin Asymmetries are discussed as well, together with further items like electric and magnetic nucleonic form factors and open charm production. Counting rates estimations

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Section: Spin Asymmetries In Hyperon Productionmentioning

confidence: 99%

Spin physics with antiprotons

Maggiora¹,

Abazov²,

Alexeev³

et al. 2005

Czech J Phys

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“…The understanding of the mechanism that produces polarised hyperons is, however, still far from complete and a wealth of different models have been proposed [10,11,12,13,14,15]. The model discussed in this paper is an extension of a semiclassical model [11] that provides a good description of observed polarisation data for inclusively produced Λ hyperons in pA → ΛX reactions.…”

Section: Introductionmentioning

confidence: 99%

String model description of polarisation and angular distributions in ¯pp → ¯ΛΛ at low energies

et al. 2002

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The observed polarisation of Λ hyperons from the inclusive pA → ΛX reaction at high energies has previously been well described within the Lund string model through polarised ss quark pair production in the string breaking hadronisation process. This model is here applied to the exclusive pp → ΛΛ reaction at low energies and compared to available data sets down to an incident beam momentum of 1.835 GeV/c. This required an extension of the diquark scattering model to involve three components: an isotropic part relevant close to threshold, a spectator part and a forward scattering part as in pA → ΛX at high energies. The observed angular distributions are then reproduced and, for momentum transfers above |t ′ | = 0.2 GeV 2 , agreement with the measured polarisation is also obtained.

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“…In the semi-classical Anderson model, it is considered due to creation of ss-pair in the color string field [6]. Another quasi-classical model uses the known effect of Thomas precession [7] and the dependence of the precession sign on the quark acceleration or deceleration in the process of quark recombination into hadrons [8].…”

Section: Physics Motivationmentioning

confidence: 99%

Systematic Study of Spin Effects at SPASCHARM Experiment at 70-GeV Accelerator in Protvino

Mochalov

Abramov

Bazhanov

et al. 2016

Int. J. Mod. Phys. Conf. Ser.

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A new experiment SPASCHARM for systematic study of polarization phenomena in the inclusive and exclusive hadronic reactions in the energy range of IHEP accelerator U-70 (12-50 GeV) is currently under development. The universal experimental setup will detect dozens of various resonances and stable particles produced in collisions of unpolarized beams with the polarized target, and at the next stage, using polarized proton and antiproton beams. At the beginning, the final states consisting of light quarks (u, d, s) will be reconstructed, and later on the charmonium states will be studied. Measurements are planned for a variety of beams: π ± , K ± , p, antiprotons. Hyperon polarization and spin density matrix elements of the vector mesons will be measured along with the singlespin asymmetry (SSA). The 2π-acceptance in azimuth, which is extremely useful for reduction of systematic errors in measurements of spin observables, will be implemented in the experiment. The solid angle acceptance of the setup, ∆θ ≈ 250 mrad vertically and 350 mrad horizontally in the beam fragmentation region, covers a wide range of kinematic variables p T and x F . This provides the opportunity for separating dependences on these two variables which is usually not possible in the setups with a small solid angle acceptance. Unlike some previous polarization experiments, the SPASCHARM will be able to simultaneously accumulate and record data on the both, charged and neutral particle production.

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Quark dynamics of polarization in inclusive hadron production

Cited by 68 publications

References 10 publications

Spin physics with antiprotons

Spin physics with antiprotons

String model description of polarisation and angular distributions in ¯pp → ¯ΛΛ at low energies

Systematic Study of Spin Effects at SPASCHARM Experiment at 70-GeV Accelerator in Protvino

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