2023 Impact factor 4.2
Particles and Fields
Eur. Phys. J. C 14, 275-284
DOI 10.1007/s100520000360

$ J/\psi +{\mathrm{jet}} $ diffractive production in the direct photon process at HERA

J.-S. Xu1 - H.-A. Peng2,3 - Z.-Y. Yan4 - Z.-M. He4

1 Department of Physics, Peking University, Beijing 100871, P.R. China
2 China Center of Advance Science and Technology (World Laboratory), Beijing 100080, P.R. China
3 Department of Physics, Peking University, Beijing 100871, P.R. China
4 Department of Physics, Hebei Teacher's University, Shijiazhuang 050016, P.R. China

Received: 13 September 1999 / Revised version: 31 December 1999 /
Published online: 6 April 2000 - © Springer-Verlag 2000

We present a study of the $ J/\psi +{\mathrm{jet}} $ diffractive production in direct photon processes at HERA based on the factorization theorem for lepton-induced hard diffractive scattering and the factorization formalism of the non-relativistic QCD (NRQCD) for quarkonia production. Using the diffractive gluon distribution function extracted from HERA data on diffractive deep inelastic scattering and diffractive dijet photon production, we demonstrate that this process is measurable at DESY HERA. The experimental study of this process can give valuable insight in the diffractive production mechanism and test the color-octet mechanism for heavy quarkonia production in a new environment.

Copyright Società Italiana di Fisica, Springer-Verlag 2000