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Title: Measurement of inclusive D{sup plus_minus ovr s} photoproduction at HERA.

Abstract

The first measurement of inclusive D{sub s}{sup {+-}} photoproduction at HERA has been performed with the ZEUS detector for photon-proton centre-of-mass energies 130<W<280 GeV. The measured cross section for 3<{rho} {perpendicular} D{sub s}<12 GeV and |{eta}{sup D{sub s}}| < 1.5 is {sigma}{sub ep{yields}D{sub s}x}=3.79{+-}0.59(stat.){sup +0.26}{sub -0.46}(syst.){+-}0.94 (br.) nb, where the last error arises from the uncertainty in the D{sub s}{sup {+-}} decay branching ratio. The measurements are compared with inclusive D*{sup {+-}} photoproduction cross sections in the same kinematic region and with QCD calculations. The D{sub s}{sup {+-}} cross sections lie above a fixed-order next-to-leading order calculation and agree better with a tree-level {Omicron}({alpha}{alpha}{sub s}{sup 3}) calculation that was tuned to describe the ZEUS D*{sup {+-}} cross sections. The ratio of D{sub s}{sup {+-}} to D*{sup {+-}} cross sections is 0.41{+-}0.07 (stat.){sup 0.03}{sub 0.05}(syst.){+-}0.10 (br.). From this ratio, the strangeness-suppression factor in charm photoproduction, within the LUND string fragmentation model, has been calculated to be {gamma}{sub s}=0.27{+-}0.05{+-}0.07 (br.). The cross-section ratio and {gamma}{sub s} are in good agreement with those obtained in charm production in e{sup +}e{sup -} annihilation.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
942876
Report Number(s):
ANL-HEP-PR-00-32
Journal ID: ISSN 0370-2693; PYLBAJ; TRN: US0904493
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Phys. Lett. B
Additional Journal Information:
Journal Volume: 481; Journal Issue: 2-4 ; May 25, 2000; Journal ID: ISSN 0370-2693
Country of Publication:
United States
Language:
ENGLISH
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ANNIHILATION; BRANCHING RATIO; CROSS SECTIONS; DECAY; FRAGMENTATION; PHOTOPRODUCTION; QUANTUM CHROMODYNAMICS

Citation Formats

Breitweg, J., Chekanov, S., Derrick, M., Krakauer, D., Magill, S., Musgrave, B., Pellegrino, A., Repond, J., Stanek, R., Yoshida, R., ZEUS Collaboration, High Energy Physics, and ZEUS Collaboration. Measurement of inclusive D{sup plus_minus ovr s} photoproduction at HERA.. United States: N. p., 2000. Web. doi:10.1016/S0370-2693(00)00431-7.
Breitweg, J., Chekanov, S., Derrick, M., Krakauer, D., Magill, S., Musgrave, B., Pellegrino, A., Repond, J., Stanek, R., Yoshida, R., ZEUS Collaboration, High Energy Physics, & ZEUS Collaboration. Measurement of inclusive D{sup plus_minus ovr s} photoproduction at HERA.. United States. doi:10.1016/S0370-2693(00)00431-7.
Breitweg, J., Chekanov, S., Derrick, M., Krakauer, D., Magill, S., Musgrave, B., Pellegrino, A., Repond, J., Stanek, R., Yoshida, R., ZEUS Collaboration, High Energy Physics, and ZEUS Collaboration. Thu . "Measurement of inclusive D{sup plus_minus ovr s} photoproduction at HERA.". United States. doi:10.1016/S0370-2693(00)00431-7.
@article{osti_942876,
title = {Measurement of inclusive D{sup plus_minus ovr s} photoproduction at HERA.},
author = {Breitweg, J. and Chekanov, S. and Derrick, M. and Krakauer, D. and Magill, S. and Musgrave, B. and Pellegrino, A. and Repond, J. and Stanek, R. and Yoshida, R. and ZEUS Collaboration and High Energy Physics and ZEUS Collaboration},
abstractNote = {The first measurement of inclusive D{sub s}{sup {+-}} photoproduction at HERA has been performed with the ZEUS detector for photon-proton centre-of-mass energies 130<W<280 GeV. The measured cross section for 3<{rho} {perpendicular} D{sub s}<12 GeV and |{eta}{sup D{sub s}}| < 1.5 is {sigma}{sub ep{yields}D{sub s}x}=3.79{+-}0.59(stat.){sup +0.26}{sub -0.46}(syst.){+-}0.94 (br.) nb, where the last error arises from the uncertainty in the D{sub s}{sup {+-}} decay branching ratio. The measurements are compared with inclusive D*{sup {+-}} photoproduction cross sections in the same kinematic region and with QCD calculations. The D{sub s}{sup {+-}} cross sections lie above a fixed-order next-to-leading order calculation and agree better with a tree-level {Omicron}({alpha}{alpha}{sub s}{sup 3}) calculation that was tuned to describe the ZEUS D*{sup {+-}} cross sections. The ratio of D{sub s}{sup {+-}} to D*{sup {+-}} cross sections is 0.41{+-}0.07 (stat.){sup 0.03}{sub 0.05}(syst.){+-}0.10 (br.). From this ratio, the strangeness-suppression factor in charm photoproduction, within the LUND string fragmentation model, has been calculated to be {gamma}{sub s}=0.27{+-}0.05{+-}0.07 (br.). The cross-section ratio and {gamma}{sub s} are in good agreement with those obtained in charm production in e{sup +}e{sup -} annihilation.},
doi = {10.1016/S0370-2693(00)00431-7},
journal = {Phys. Lett. B},
issn = {0370-2693},
number = 2-4 ; May 25, 2000,
volume = 481,
place = {United States},
year = {2000},
month = {5}
}