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

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

Nuclear Physics B

Volume 371, Issue 3, 9 March 1992, Pages 553-566

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Abstract

We present results on J/ψ production in muon interactions with tin and carbon targets at incident muon energies of 200 and 280 GeV. The ratio of cross sections per nucleon for J/ψ production on tin and carbon, R(Sn/C), is studied as a function of p_T², z and x. We find an enhancement for coherent J/ψ production R_coh(Sn/C) = 1.54 ± 0.07, a suppression for quasielastic production R_qe(Sn/C) = 0.79 ± 0.06 and for inelastic production R_in(Sn/C) = 1.13 ± 0.08. The inelastic cross section ratio can be interpreted within the Colour Singlet model as an enhancement of the gluon distribution in tin with respect to that in carbon. The dependence of the ratio on z and p_T² can explain the discrepancy between the results obtained in previous experiments.

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¹⁵: Supported by CPBP.01.09.

¹⁶: Supported by Bundesministerium für Forschung und Technologie.

¹⁷: Supported in part by FOM, Vrije Universiteit Amsterdam and NWO.

¹⁸: Supported by CPBP.01.06.

¹: Present address: TRIUMF, Vancouver, BC V6T 2A3, Canada.

²: Present address: Trasys, 1930 Zaventem, Belgium.

³: Present address: NIKHEF-K, P.O. Box 4395, 1009 AJ Amsterdam, The Netherlands.

⁴: Present address: INFN, Laboratori Nazionali del Gran Sasso, 67010 Assergi, Italy.

⁵: Present address: Université de Genève, 1211 Genève 4, Switzerland.

⁶: Present address: GSI, W-6100 Darmstadt, Germany.

⁷: Present address: CEBAF, Newport News, VA 23606, USA.

⁸: Present address: University of Mainz, W-6500 Mainz, Germany.

⁹: Present address: Osaka University, 567 Osaka, Japan.

¹⁰: Present address: SAP AG, W-6909 Walldorf, Germany.

¹¹: Present address: IKP2-KFA, W-5170 Jülich, Germany.

¹²: Present address: EMPA, 8600 Dübendorf, Switzerland.

¹³: On leave from Jozef Stefan Institut, Ljubljana, Yugoslavia, present address: DPhN Saclay, 91191 Gif-sur-Yvette, France.

¹⁴: Present address: University of Houston, TX 77204-5504, USA.

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

Abstract

Phys. Lett.

Phys. Rep.

Phys. Rev.

Phys. Lett.

Adv. in Phys.

Phys. Lett.

Phys. Rev. Lett.

SLAC-PUB-3257

Phys. Lett.

Phys. Lett.

Phys. Lett.

Nucl. Phys.

Z. Phys.

Phys. Rep.

Ph.D. thesis