Author/Authors :
Q2) Original Research Article
Pages 471-502
H1 Collaboration، نويسنده , , J. C. Adloff، نويسنده , , A. V. Andreev، نويسنده , , B. Andrieu، نويسنده , , T. Anthonis، نويسنده , , V. Arkadov، نويسنده , , A. Astvatsatourov، نويسنده , , A. Babaev and NRMI Investigators، نويسنده , , Matthias J. Bahr، نويسنده , , P. Baranov، نويسنده , , E. Barrelet، نويسنده , , W. Bartel، نويسنده , , P. Bate، نويسنده , , J. Becker، نويسنده , , A. Beglarian، نويسنده , , O. Behnke، نويسنده , , C. Beier، نويسنده , , V. A. Belousov، نويسنده , , T. Benisch، نويسنده , , Ch. Berger، نويسنده , , et al.، نويسنده ,
Abstract :
A measurement is presented of the cross section for D∗± meson production in diffractive deep-inelastic scattering for the first time at HERA. The cross section is given for the process ep→eXY, where the system X contains at least one D∗± meson and is separated by a large rapidity gap from a low mass proton remnant system Y. The cross section is presented in the diffractive deep-inelastic region defined by 22 GeV and |ηD∗|<1.5. The cross section is found to be 246±54±56 pb and forms about 6% of the corresponding inclusive D∗± cross section. The cross section is presented as a function of various kinematic variables, including zPobs which is an estimate of the fraction of the momentum of the diffractive exchange carried by the parton entering the hard-subprocess. The data show a large component of the cross section at low zPobs where the contribution of the boson–gluon-fusion process is expected to dominate. The data are compared with several QCD-based calculations.
