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The European Physical Journal C
ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)
Abstract Volume 1 Issue 1/2 (1998) pp 293-300
theoretical physics:
Open charm production in diffractive $ep$ collisions
M. Diehl
Centre de Physique Théorique, Ecole Polytechnique, F-91128 Palaiseau Cedex, France (e-mail: diehl@orphee.polytechnique.fr)
Received: 10 January 1997 / Revised version: 17 February 1997
Abstract. The cross section for the diffractive reaction $\gamma^\ast + p \to c \bar c + p$ with a real or virtual photon is calculated in the nonperturbative two-gluon exchange model of Landshoff and Nachtmann. Numerical predictions are given for cross sections and spectra at typical HERA values of c.m. energy and photon virtuality. The contribution of charm to the diffractive structure function is evaluated and found to be rather small in the model, and the ratio between the production rates for $b \bar{b}$ and $c \bar c$ is tiny.
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Online publication: December 11, 1997
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