D∗± meson production in deep-inelastic diffractive interactions at HERA

D∗± meson production in deep-inelastic diffractive interactions at HERA

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...

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Veröffentlicht in:Physics letters. B 2001-11, Vol.520 (3-4), p.191-203
Hauptverfasser: Adloff, C., Andreev, V., Andrieu, B., Anthonis, T., Arkadov, V., Astvatsatourov, A., Babaev, A., Bähr, J., Baranov, P., Barrelet, E., Bartel, W., Bate, P., Becker, J., Beglarian, A., Behnke, O., Beier, C., Belousov, A., Benisch, T., Berger, Ch, Berndt, T., Bizot, J.C., Boehme, J., Boudry, V., Braunschweig, W., Brisson, V., Bröker, H.-B., Brown, D.P., Brückner, W., Bruncko, D., Bürger, J., Büsser, F.W., Bunyatyan, A., Burrage, A., Buschhorn, G., Bystritskaya, L., Campbell, A.J., Cao, J., Caron, S., Cassol-Brunner, F., Clarke, D., Clerbaux, B., Collard, C., Contreras, J.G., Coppens, Y.R., Coughlan, J.A., Cousinou, M.-C., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., Davidsson, M., Delcourt, B., Delerue, N., Demirchyan, R., De Roeck, A., De Wolf, E.A., Diaconu, C., Dingfelder, J., Dixon, P., Dodonov, V., Dowell, J.D., Droutskoi, A., Dubak, A., Duprel, C., Eckerlin, G., Eckstein, D., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellerbrock, M., Elsen, E., Erdmann, M., Erdmann, W., Faulkner, P.J.W., Favart, L., Fedotov, A., Felst, R., Ferencei, J., Ferron, S., Fleischer, M., Fleming, Y.H., Flügge, G., Fomenko, A., Foresti, I., Formánek, J., Franke, G., Gabathuler, E., Gabathuler, K., Garvey, J., Gassner, J., Gayler, J., Gerhards, R., Gerlich, C., Ghazaryan, S., Goerlich, L., Gogitidze, N.
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Sprache:eng
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High Energy Physics - Experiment
Physics
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Zusammenfassung: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 2 Q^2 100 GeV^2, 0.05 y 0.7, x_pom 0.04, M_Y 1.6 GeV and |t| 1 GeV^2. The D* mesons are restricted to the range ptD* 2 GeV and |\eta_D* | 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 z_pom^obs 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 z_pom^obs where the contribution of the Boson-Gluon-Fusion process is expected to dominate. The data are compared with several QCD--based calculations.
ISSN:0370-2693
DOI:10.1016/S0370-2693(01)01155-8