Perturbative QCD for J/ψ inclusive production via initial state radiation in collisions Supported by the National Natural Science Foundation of China (11475183) and the Key Research Program of Frontier Sciences, CAS, (Y7292610K1)

Bin Gong ( Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China) ; Yu-Dong Wang ( Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China) ; Jian-Xiong Wang ( Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China)

The process with the center-of-mass (CM) energy in the range from 3.7 to 10.6 GeV is calculated up to the next-to-leading order (NLO) in quantum chromodynamics (QCD). At 10.6 GeV, the result is consistent with the experimental result from Belle. However, the predictions are much smaller than the background in the measurements at BESIII in the low CM energy range from 3.7 to 4.6 GeV. This indicates that the convergence of the QCD perturbative expansion becomes worse as the CM energy is closer to the inclusive production threshold. For a further study of the QCD mechanism of production in collisions with different CM energies, the initial state radiation effect of and are calculated in QCD NLO. The results are plotted and the number of events for different CM energy bins are provided for SuperKEKB. This provides a method to precisely test the validity of perturbative predictions for production in future measurements.

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  "titles": [
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      "title": "Perturbative QCD for J/\u03c8 inclusive production via initial state radiation in \n\t\t\t\t\t collisions Supported by the National Natural Science Foundation of China (11475183) and the Key Research Program of Frontier Sciences, CAS, (Y7292610K1)"
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      "value": "The process \n\t\t\t\t\t with the center-of-mass (CM) energy in the range from 3.7 to 10.6 GeV is calculated up to the next-to-leading order (NLO) in quantum chromodynamics (QCD). At 10.6 GeV, the result is consistent with the experimental result from Belle. However, the predictions are much smaller than the background in the measurements at BESIII in the low CM energy range from 3.7 to 4.6 GeV. This indicates that the convergence of the QCD perturbative expansion becomes worse as the CM energy is closer to the inclusive \n\t\t\t\t\t production threshold. For a further study of the QCD mechanism of \n\t\t\t\t\t production in \n\t\t\t\t\t collisions with different CM energies, the initial state radiation effect of \n\t\t\t\t\t and \n\t\t\t\t\t are calculated in QCD NLO. The results are plotted and the number of events for different CM energy bins are provided for SuperKEKB. This provides a method to precisely test the validity of perturbative predictions for \n\t\t\t\t\t production in future measurements.\n\t\t\t\t"
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Published on:
01 August 2019
Publisher:
Institute of Physics Publishing/Chinese Academy of Sciences
Published in:
Chinese Physics C , Volume 43 (2019)
Issue 8
Article ID: 083104
DOI:
https://doi.org/10.1088/1674-1137/43/8/083104
arXiv:
1903.08161
Copyrights:
© 2019 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd
Licence:
cc-by

Fulltext files: