Production of spin-3 mesons in diffractive DIS
INFN, Gruppo Collegato di Cosenza, Universitá della Calabria, Dipartimento di Fisica, Ponte Bucci, 31C, 87036, Arcavacata di Rende (CS), Italy
2 Sobolev Institute of Mathematics, Acad. Koptyug avenue, 4, 630090, Russia
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We calculate the amplitudes of J PC = 3- - meson production in diffractive DIS within the k t-factorization approach, with particular attention paid to the meson. We find that at all Q 2 the production cross section is 2-5 times smaller than the production cross section, which is assumed to be a pure D-wave state. Studying and separately, we observe domination of in and domination of in and offer an explanation of this behavior in simple terms. We also find very strong contributions - sometimes even domination - of the s-channel helicity violating amplitudes. The typical color dipole sizes probed in production are shown to be larger than those in the ground state production, and the energy dependence of cross section turns out to be much flatter than the production cross section. All the conclusions about the relative behavior of the and mesons are numerically stable against variations of the input parameters.
© Springer-Verlag, 2005