Spin effects in high energy hadron-hadron scattering

Goloskokov, S. V.; Kuleshov, S.P.; Selyugin, O. V.

doi:10.1007/bf01551457

Cited by 42 publications

(87 citation statements)

References 21 publications

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“…The term p α p α ′ A(r) leads to the transverse spin-flip in the vertex which does not vanish in the s → ∞ limit. The single spin transverse asymmetry predicted in the models [6,7] is about 10% for |t| ∼ 3GeV 2 which is of the same order of magnitude as has been observed experimentally [8]. These model approaches give for the ratio…”

Section: Introductionsupporting

confidence: 76%

Spin effects in diffractive hadron photoproduction

Goloskokov¹

2001

AIP Conference Proceedings

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Abstract. We study spin asymmetries in diffractive QQ and vector meson production which are sensitive to the spin-dependent part of the two-gluon-nucleon coupling. It is found that the A ll and A lT asymmetry in diffractive reactions can be used to study polarized gluon distributions of the proton. I INTRODUCTIONInvestigation of the structure of hadrons, is a problem of considerable interest now. The inclusive reaction can be used to study ordinary parton distributions. However, it is difficult to distinguish events with a single outgoing proton or jet in a fixed target experiment like COMPASS [1]. In this case, at small x the diffractive events will contribute together with nondiffractive one. The measured asymmetry can be written in the formHereIt can be shown that the ratio R should increase with x → 0. The integrated over x R ratio has been found at HERA to be about 20-30% [2]. This means that diffractive events might be important in extraction of asymmetry at small x from experiment. The diffractive hadron photoproduction can be expressed in terms of skewed parton distribution (SPD) in the nucleon F ζ (x) [3]. Investigation of such diffractive reactions should play a keystone role in future study F x (x) at small x. In the diffractive charm quark production including J/Ψ reactions, the predominant contribution is determined by the two-gluon exchange (gluon SPD). Analysis of these reactions should throw light on the gluon structure of the proton at small x [4,5].To study spin effects in the diffractive hadron production, one must know the structure of the two-gluon coupling with the proton at small x. The QCD-inspired diquark model generates the spin-dependent ggp coupling [6] of the following form:

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Section: Introductionsupporting

confidence: 76%

Spin effects in diffractive hadron photoproduction

Goloskokov¹

2001

AIP Conference Proceedings

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“…TheK function is the spin-dependent part of the Pomeron coupling which produces in our case the not vanishing at high-energies spin-flip effects. The models [26,28] predict the value of single spin transverse asymmetry of about 10% for |t| ∼ 3GeV 2 which is of the same order of magnitude as that observed experimentally [29]. It has been found in [26,28] that the ratio |K|/|B| ∼ 0.1−0.2 and has a weak energy dependence.…”

Section: Proton Two Gluon Coupling and Hadron Tensorsupporting

confidence: 70%

Transverse spin effects in diffractive hadron leptoproduction

Goloskokov

2002

Eur. Phys. J. C

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“…(6), that is, we fit the data at √ s = 13.8, 16.8 and 23.8 GeV assuming α sf (t) = α I P (t). Then we check the quality of the fit with the description of the polarization data at 19.4 GeV.…”

Section: A the Kinematical Zero Of The Spin-flip Amplitudementioning

confidence: 99%

“…Since the differential cross section (dσ/dt) at ISR energies is usually assumed to be dominated by the spin-non-flip amplitude, many of the models describing the diffraction in pp scattering do not take into account the contribution from spin-flip amplitudes [2,3,4]. Others do [5,6,7,8] but in this case they use data at lower energies [9]. However, the study of diffraction in spin-flip amplitudes began many years before that when one of us [10] noticed that polarization data at πp scattering suggested a diffractive contribution in the spin-flip πp amplitude at high energy which becomes evident when the kinematical zero is removed.…”

Section: Introductionmentioning

confidence: 99%