The European Physical Journal C

ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)

Table of Contents

Abstract Volume 5 Issue 3 (1998) pp 493-500
DOI 10.1007/s100529800859

theoretical physics:
Validity of double scaling analysis in semi-inclusive processes - $J/\psi$ production at HERA

Tapobrata Sarkar, Rahul Basu

The Institute of Mathematical Sciences, Chennai (Madras) 600 113, India (e-mail: sarkar,rahul@imsc.ernet.in)

Received: 17 December 1997 / Published online: 10 March 1998

Abstract. In this paper we check the validity of the ideas of double scaling as given by Ball and Forte in a semi inclusive process like $J/\psi$ production at HERA, in different kinematical regions, for low values of the Bjorken variable $x$. In particular, we study $J/\psi$ production in the inelastic and diffractive (elastic) regimes using the double scaling form of the gluon distribution functions. We compare these predictions with data (wherever available) and with other standard parameterisations. We find that double scaling holds in the inelastic regime over a larger kinematic region than that given by the analysis of the proton structure function $F_2^p$. However, in the diffractive region, double scaling seems to suggest an admixture of hard pomeron boundary conditions for the gluon distribution, while predicting a steeper rise in the cross section than suggested by present data.

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Online publication: September 24, 1998
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