OPEN CHARM PRODUCTION IN DIFFRACTIVE ep COLLISIONS
نویسنده
چکیده
The cross section for the diffractive reaction γ∗ + p → cc̄ + 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 bb̄ and cc̄ is tiny. email: [email protected] Unité propre 14 du CNRS
منابع مشابه
DIFFRACTION IN ep COLLISIONS
Recent measurements of the diffractive deep-inelastic cross section are used to extract diffrac-tive parton densities of the proton. These are subsequently applied in models to predict the production of jets and open charm in the final state. A rapidity gap suppression factor for dijet production in diffractive photoproduction relative to diffractive deep-inelastic scattering is obtained using ...
متن کاملDiffractive Final States with the H1 Detector at HERA
Abstract. Recent measurements of diffractive dijet and charm quark production in electron-proton collisions using the H1 detector at HERA are presented, where the exchanged photon is either almost real or highly virtual. The data are compared with leading and next-to-leading order QCD calculations based on the diffractive parton distributions obtained from a recent DGLAP QCD analysis of H1 incl...
متن کاملDiffractive Dijet and Charm Production at Hera
Jet and charm quark production in diffractive interactions is sensitive to the partonic structure of the diffractive exchange. This article reviews recent cross section measurements of such processes in both deep-inelastic scattering (DIS) regime and photoproduction (PHP) from the HERA ep collider experiments. The cross sections are compared to next-to-leading order QCD calculations based on fa...
متن کاملCharm Production in Ep-collisions
Recent results on the production of open charm in electron proton scattering at HERA are reviewed. Results on the fragmentation of charm are presented and compared to the measurements at e + e − colliders. Recent results on the charm contribution to the proton structure function F2 are shown. Furthermore, measurements of inclusive D * meson, D * + jet and D * + muon production are presented. Th...
متن کاملIntrinsic Heavy Quark States
The postulate that ordinary hadrons contain intrinsic charm quark states-(such as luudcc> in the proton) at the 1% level is shown to explain two sets of unexpected experimental results: (l).the copious diffractive. production of charmed hadrons at large longitudinal momentum in high energy proton-nucleon and pion-nucleon collisions, and (2) the anomalously large number of same-sign dimuon event...
متن کامل