χc Charmonium — A tool to investigate gluon polarization

Batunin, A.V.; Slabospitsky, S.

doi:10.1016/0370-2693(87)90019-0

Cited by 16 publications

(14 citation statements)

References 1 publication

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“…A soft gluon with a small energy E ∼ Λ QCD is emitted after the hard interaction is over, bringing away the unwanted color and changing other quantum numbers of the produced CO system. In our calculations such soft gluon emission is described by a classical multipole expansion, in which the electric dipole (E1) transition dominates [47]. Only a single E1 transition is needed to transform a P -wave state into an S-wave state and the structure of the respective 3 P…”

Section: Theoretical Frameworkmentioning

confidence: 99%

Bottomonia production and polarization in the NRQCD with $$k_T$$-factorization. I: $$\Upsilon (3S)$$ and $$\chi _b(3P)$$ mesons

Abdulov

Lipatov

2019

Eur. Phys. J. C

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Section: Theoretical Frameworkmentioning

confidence: 99%

Bottomonia production and polarization in the NRQCD with $$k_T$$-factorization. I: $$\Upsilon (3S)$$ and $$\chi _b(3P)$$ mesons

Abdulov

Lipatov

2019

Eur. Phys. J. C

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“…This uncertainty can be traced back to the different explanations of the EMC effect on proton spin. This uncertainty will be reduced using other measurements at RHIC, e.g., jet [14,15,17], direct photon [17,18,19], heavy quark [20] or charmonium production [21,22,23,24], designed to measure the polarized gluon contribution to proton spin. Once this error is reduced, it will be possible to extract the desired quantity, ∆u − ∆d.…”

Section: Results On ∆U − ∆Dmentioning

confidence: 99%

HadronicWproduction and the Gottfried sum rule

Doncheski¹,

Halzen²,

Kim³

et al. 1994

Phys. Rev. D

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The difference in production rate between W + and W − at hadron colliders is very sensitive to the the difference between up-and down-quark distributions in the proton. This sensitivity allows for a variety of useful measurements. We consider the difference d s (x, Q 2 ) − u s (x, Q 2 ) in the sea distributions and the difference ∆u(x, Q 2 ) − ∆d(x, Q 2 ) in the polarized parton distribution functions. In both cases we construct an asymmetry to reduce systematic uncertainties. Although we discuss measurements at the Tevatron and future hadron colliders, we find that the Brookhaven Relativistic Heavy Ion Collider (RHIC) is the most appropriate hadron collider for these measurements.

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“…Quarkonium (especially J/ψ) production, both at low transverse momentum [13,14,15,16] and at high p T [17,18], has also been examined for its possible spindependence and sensitivity to the polarized gluon content of the proton. One intriguing suggestion, due to Cortes and Pire [13] (hereafter CP), is to consider low p T χ 2 (cc) production where the dominant lowest-order subprocess would be gg → χ 2 .…”

Section: Introductionmentioning

confidence: 99%

Aspects of χ and ψ production in polarized proton-proton collisions

Doncheski

Robinett

1994

Z. Phys. C - Particles and Fields

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Several topics of relevance to low transverse momentum ψ and χ 1,2 (cc) production in polarized proton-proton collisions are discussed. The leading O(α 3 S ) contributions to the low p T χ 1 production cross-sections via gg, qg, and qq initial states are calculated as well as the corresponding spin-spin asymmetries. We find that χ 1 production increases relative to direct ψ and χ 2 production, providing up to 25% of the observable e + e − pairs arising from ψ decays in pp collisions at √ s = 500 GeV . The spin-dependence of χ 1 production, however, is much smaller than for either direct ψ or χ 2 production and so will likely be far less useful than either process in probing the polarized gluon structure function of the proton. A subset of the O(α 3 S ) radiative corrections to χ 2 production involving initial state quarks are also performed and compared to leading order gg → χ 2 predictions.

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χc Charmonium — A tool to investigate gluon polarization

Cited by 16 publications

References 1 publication

Bottomonia production and polarization in the NRQCD with $$k_T$$-factorization. I: $$\Upsilon (3S)$$ and $$\chi _b(3P)$$ mesons

Bottomonia production and polarization in the NRQCD with $$k_T$$-factorization. I: $$\Upsilon (3S)$$ and $$\chi _b(3P)$$ mesons

HadronicWproduction and the Gottfried sum rule

Aspects of χ and ψ production in polarized proton-proton collisions

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