Charm production from photon-proton reactions in a hadronic model

W. Liu, S. H. Lee, C. M. Ko

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The cross section for photoproduction of charmed hadrons from protons is studied using an effective Lagrangian that includes heavy charmed mesons and baryons. Both two-body final states involving Λc and charmed meson as well as three-body final states involving nucleon and charm-anticharm meson pair are included. An overall form factor is introduced in each process to take into account finite hadron sizes without breaking the gauge invariance. Using coupling constants determined either empirically or via SU(4) relations, we adjust the cutoff parameter in the form factor to reproduce measured total charmed hadron production cross section from photon-proton reactions at center-of-mass energy of 6 GeV. The resulting relative contribution from two-body and three-body final states is consistent with experiments. The predicted cross section for photoproduction of charmed hadron from protons near threshold is seen to be appreciable. The result is further compared with predictions from leading-order perturbative QCD.

Original languageEnglish
Pages (from-to)375-390
Number of pages16
JournalNuclear Physics A
Volume724
Issue number3-4
DOIs
Publication statusPublished - 2003 Sep 8

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protons
mesons
photons
photoproduction
form factors
cross sections
gauge invariance
hadrons
center of mass
baryons
cut-off
quantum chromodynamics
thresholds
predictions
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Liu, W. ; Lee, S. H. ; Ko, C. M. / Charm production from photon-proton reactions in a hadronic model. In: Nuclear Physics A. 2003 ; Vol. 724, No. 3-4. pp. 375-390.
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Charm production from photon-proton reactions in a hadronic model. / Liu, W.; Lee, S. H.; Ko, C. M.

In: Nuclear Physics A, Vol. 724, No. 3-4, 08.09.2003, p. 375-390.

Research output: Contribution to journalArticle

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AB - The cross section for photoproduction of charmed hadrons from protons is studied using an effective Lagrangian that includes heavy charmed mesons and baryons. Both two-body final states involving Λc and charmed meson as well as three-body final states involving nucleon and charm-anticharm meson pair are included. An overall form factor is introduced in each process to take into account finite hadron sizes without breaking the gauge invariance. Using coupling constants determined either empirically or via SU(4) relations, we adjust the cutoff parameter in the form factor to reproduce measured total charmed hadron production cross section from photon-proton reactions at center-of-mass energy of 6 GeV. The resulting relative contribution from two-body and three-body final states is consistent with experiments. The predicted cross section for photoproduction of charmed hadron from protons near threshold is seen to be appreciable. The result is further compared with predictions from leading-order perturbative QCD.

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