Ratio of J/ψ production cross sections in deep inelastic muon scattering from tin and carbon

Amaudruz, P.; Arneodo, M.; Arvidson, Adam Regn; Badełek, B.; Baum, G.; Beaufays, J.; Bird, I.; Botje, M.; Broggini, C.; Brückner, W.; Brüll, A.; Burger, W. J.; Ciborowski, J.; Dantzig, R. van; Döbbeling, H.; Domingo, J.; Drinkard, J.; Düren, M.; Engelien, H.; Ferrero, M. I.; Fluri, L.; Harrach, D. von; Heijden, M. van der; Heusch, C.A.; Ingram, Q.; Janson, K.; Jong, M. de; Kabuß, E. M.; Kaiser, R.; Ketel, T.; Klein, F.; Kullander, S.; Landgraf, U.; Lindqvist, T.; Mallot, G.K.; Mariotti, C.; Middelkoop, G. van; Mizuno, Y.; Nassalski, J.; Nowotny, D.; Peroni, C.; Povh, Bogdan; Rieger, R.; Rith, Klaus; Röhrich, K.; Rondio, E.; Ropelewski, L.; Sandacz, A.; Scholz, Christoph; Sennhauser, U.; Sever, F.; Shibata, T. A.; Siebler, Mario; Simon, A.; Staiano, A.; Tzamouranis, Y.; Vuilleumier, J. L.; Walcher, Thomas; Windmolders, R.; Zetsche, Frank

doi:10.1016/0550-3213(92)90686-6

Cited by 54 publications

(38 citation statements)

References 25 publications

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“…There is no evidence for a nuclear target suppression of inelastic J/ψ photo-and leptoproduction. On the contrary, there is an indication [42] of a slight nuclear enhancement at x F ≃ 0.7 (α = 1.05 ± 0.03), in stark contrast to the strong nuclear suppression seen at this x F in hadroproduction [29]. Due to the absence of comoving gluons and the validity of the CSM we expect α ≃ 1.…”

Section: Nuclear Target Dependencementioning

confidence: 76%

Quarkonium production through hard comover scattering

Hoyer

Peigné

1999

Phys. Rev. D

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We propose a qualitatively new mechanism for quarkonium production, motivated by the global features of the experimental data and by the successes/failures of existing models. In QCD, heavy quarks are created in conjunction with a bremsstrahlung color field emitted by the colliding partons. We study the effects of perturbative gluon exchange between the quark pair and a comoving color field. Such scattering can flip the spin and color of the quarks to create a non-vanishing overlap with the wave function of physical quarkonium. Several observed features that are difficult to understand in current models find simple explanations. Transverse gluon exchange produces unpolarized J/ψ's, the χc1 and χc2 states are produced at similar rates, and the anomalous dependence of the J/ψ cross section on the nuclear target size can be qualitatively understood.

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Section: Nuclear Target Dependencementioning

confidence: 76%

Quarkonium production through hard comover scattering

Hoyer

Peigné

1999

Phys. Rev. D

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“…We want to demonstrate here 3 that as a function of x nuclear effects can be rather big (with effective cross section of order of 20 ÷ 30 mb) but integrally they cancelled because of cancelling contributions from screening and anti-screening regions. This is demonstrated at Fig.2 where we show description of the NMC data [16] on ratio R(Sn/Be) of J/ψ electroproduction cross sections as a function of x ≡ x F . Since in this case the J/ψ spectrum is concentrated at x close to 1, the anti-screening regime takes place already at x 0.8.…”

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confidence: 75%

Screening and antiscreening effects in J/ψ production on nuclei

Boreskov

Kaǐdalov

2003

Jetp Lett.

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Nuclear effects in J/ψ hadro-and electroproduction on nuclei are considered in framework of reggeon approach. It is shown that screening regime which holds for electroproduction at x F 0.7 and for hadroproduction at x F −(0.3 ÷ 0.4) is changed with anti-screening regime for smaller x F values.Heavy-quark production on nuclei provides an important information on strong-interaction mechanisms and is intensively discussed (see e.g. refs [1, 2, 3] for review of experimental data, discussion of some phenomenological models and more references). In this note we will discuss a phenomenon of changing screening regime to anti-screening one in J/ψ hadro-and electroproduction when x ψ ≡ x F decreases in the framework of the BCKT model [4,5] based on the reggeon approach. For

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“…To pin down the nuclear gluon shadowing at small values of x, high precision data on the Q 2 dependence of F A 2 /F D 2 , F A 2 /F C 2 would be needed especially at x > ∼ 0.01, where the gluons start to determine the evolution of the sea quarks more strongly [14,10]. In the future, perhaps also the gluon initiated processes like open charm and J/Ψ production in DIS [34] and in pA collisions [35,36] could help in constraining the gluon antishadowing peak further.…”

Section: Discussionmentioning

confidence: 99%

The scale dependent nuclear effects in parton distributions for practical applications

1999

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The scale dependence of the ratios of parton distributions in a proton of a nucleus A and in the free proton,, is studied within the framework of the lowest order leading-twist DGLAP evolution. By evolving the initial nuclear distributions obtained with the GRV-LO and CTEQ4L sets at a scale Q 2 0 , we show that the ratios R A i (x, Q 2 ) are only moderately sensitive to the choice of a specific modern set of free parton distributions. We propose that to a good first approximation, this parton distribution setdependence of the nuclear ratios R A i (x, Q 2 ) can be neglected in practical applications. With this result, we offer a numerical parametrization of R A i (x, Q 2 ) for all parton flavours i in any A > 2, and at any 10 −6 ≤ x ≤ 1 and any Q 2 ≥ 2.25 GeV 2 for computing cross sections of hard processes in nuclear collisions.

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Ratio of J/ψ production cross sections in deep inelastic muon scattering from tin and carbon

Cited by 54 publications

References 25 publications

Quarkonium production through hard comover scattering

Quarkonium production through hard comover scattering

Screening and antiscreening effects in J/ψ production on nuclei

The scale dependent nuclear effects in parton distributions for practical applications

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