### Résumé du preprint DAPNIA-07-307

DAPNIA-07-307
Diffractive $\chi$ Production at the Tevatron and the LHC
M. Rangel, C. Royon, G. Alves, J. Barreto, R. Peschanski
We present predictions for the diffractive production of $\\chi$ mesons in the
central rapidity region usually covered by collider detectors. The predicted
cross sections are based on the Bialas-Landshoff formalism for both exclusive
and
inclusive production and makes use of the
DPEMC Monte-Carlo simulation adapted with kinematics appropriate for small-mass
diffractive production. We compare generator-level results with a CDF
measurement for exclusive $\\chi$ production, and study background and other
scenarios
including the contribution
of inclusive $\\chi$ production.  The results agree with  the Tevatron data
and are extrapolated, highlighting the exclusive $\\chic$ production
at LHC energies. A possible new measurement at the Tevatron using the D\\O\\
forward detectors is investigated, taking advantage of  the dominance of
exclusive production for high enough diffractive mass fraction.