Inelastic leptoproduction of as a probe of the small-x behaviour of the gluon structure function

Martin, A.; Ng, C.; Stirling, W.J.

doi:10.1016/0370-2693(87)91347-5

Cited by 63 publications

(30 citation statements)

References 11 publications

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“…In principle, at HERA energies we can also expect contributions from B-decays but these turn out to be dominant at values of z ≤ 0.1 [19], and can, therefore, be safely neglected in our analysis.…”

Section: Dσ(γpmentioning

confidence: 99%

production via fragmentation at HERA

Godbole¹,

Roy²,

Sridhar³

1996

Physics Letters B

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We compute the contributions to large-p T J/ψ production at HERA coming from fragmentation of gluons and charm quarks. We find that the charm quark fragmentation contribution dominates over the direct production of J/ψ via photon-gluon fusion at large-p T , while the gluon fragmentation is negligibly small over the whole range of p T . An experimental study of p T distributions of J/ψ at HERA will provide a direct probe of the charm quark fragmentation functions.November 1995 * rohini@cts.iisc.ernet.in † dproy@theory.tifr.res.in ‡ sridhar@theory.tifr.res.in

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Section: Dσ(γpmentioning

confidence: 99%

production via fragmentation at HERA

Godbole¹,

Roy²,

Sridhar³

1996

Physics Letters B

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“…Theoretical interest so far has focussed on two mechanisms for J/ψ photo-and electroproduction, elastic/diffractive [3,4] and inelastic production through photon-gluon-fusion [1,2]. While by the first mechanism one expects to shed light on the physical nature of the pomeron, inelastic J/ψ production provides information on the distribution of gluons in the nucleon [5]. The two mechanisms can be separated by measuring the J/ψ energy spectrum, described by the scaling variable…”

mentioning

confidence: 99%

Inelastic photoproduction

et al. 1995

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Inelastic photoproduction of J/ψ particles at high energies is one of the processes to determine the gluon distribution in the nucleon. We have calculated the QCD radiative corrections to the color-singlet model of this reaction. They are large at moderate photon energies, but decrease with increasing energies. The cross section and the J/ψ energy spectrum are compared with the available fixed-target photoproduction data and predictions are given for the HERA energy range. * Supported in part by Deutsche Forschungsgemeinschaft DFG † Present address: Deutsches Elektronen-Synchrotron DESY,

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“…However, the data was given as the rapidity distribution, hence many information was lost for a detail study of the peak. On the other hand, it is also pointed out in the second reference in [11] that the peak can be well explained by the theoretical results at leading twist. If more data in experiment is available, this region may be a good place to study the effect from those color-octet states and from twist-4.…”

Section: Higher Order Effect In the Small Velocity Expansionmentioning

confidence: 70%

“…Studying these processes will help to understand the role played by gluon in hadrons. The process considered here was used to study gluon distribution in nucleon before(See [11] and references cited there).…”

Section: −2mentioning

confidence: 99%

Higher twist effect in inclusive quarkonium photoproduction

1997

Nuclear Physics B

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Abstract:We analyze higher twist effect in photoproduction of quarkonium, where the quarkonium is a spin-triplet, S-wave state. We find that the nonperturbative effect of next-toleading twist is contained in three correlation functions related to the initial hadron and some of the effect of next-to-leading twist is only suppressed by the inverse of the mass square of the quarkonium. A naive estimation indicates that the effect can be significant for charmonium. In the analysis we only take the leading order in the small velocity expansion for the nonperturbative parts related to the quarkonium. Possible corrections from higher orders, especially, corrections from color-octet states are discussed in detail.

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Inelastic leptoproduction of as a probe of the small-x behaviour of the gluon structure function

Cited by 63 publications

References 11 publications

production via fragmentation at HERA

production via fragmentation at HERA

Inelastic photoproduction

Higher twist effect in inclusive quarkonium photoproduction

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