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Photoproduction of heavy vector mesons at HERA – a test field for diffraction
被引：0
作者：
R. Fiore
L.L. Jenkovszky
F. Paccanoni
机构：
[1] Dipartimento di Fisica,
[2] Università della Calabria,undefined
[3] Istituto Nazionale di Fisica Nucleare,undefined
[4] Gruppo collegato di Cosenza,undefined
[5] Arcavacata di Rende,undefined
[6] I-87030 Cosenza,undefined
[7] Italy (e-mail: FIORE@CS.INFN.IT)
,undefined
[8] Bogoliubov Institute for Theoretical Physics,undefined
[9] Academy of Sciences of the Ukrain,undefined
[10] 252143 Kiev,undefined
[11] Ukraine (e-mail: JENK@GLUK.APC.ORG)
,undefined
[12] Dipartimento di Fisica,undefined
[13] Università di Padova,undefined
[14] Istituto Nazionale di Fisica Nucleare,undefined
[15] Sezione di Padova,undefined
[16] F. Marzolo 8,undefined
[17] I-35131 Padova,undefined
[18] Italy (e-mail: PACCANONI@PADOVA.INFN.IT)
,undefined
来源：
The European Physical Journal C - Particles and Fields
|
1999年
/
10卷
关键词：
Test Field;
Energy Region;
Moderate Increase;
Vector Meson;
Threshold Region;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Exclusive diffractive photoproduction of heavy vector mesons (V=\documentclass[12pt]{minimal}
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\begin{document}$\phi, J/\psi$\end{document}, and \documentclass[12pt]{minimal}
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\begin{document}$\Upsilon$\end{document}) at HERA is studied in a model employing a dipole Pomeron exchange (P) with an inelastic \documentclass[12pt]{minimal}
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\begin{document}$\gamma PV$\end{document} vertex. The model is fitted to the data on \documentclass[12pt]{minimal}
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\begin{document}${\mathrm{d}\sigma/\mathrm{d}t}$\end{document}, B, and \documentclass[12pt]{minimal}
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\begin{document}$\sigma_{\mathrmel}$\end{document} for \documentclass[12pt]{minimal}
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\begin{document}$Q^2=0$\end{document} and beyond the threshold region. The elastic cross sections for both \documentclass[12pt]{minimal}
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\begin{document}$\phi$\end{document} and \documentclass[12pt]{minimal}
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\begin{document}$J/\psi$\end{document} photoproduction show a moderate increase within the HERA energy region. The flattening of the slope B(s) (indicating little or no shrinkage) for \documentclass[12pt]{minimal}
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\begin{document}$J/\psi$\end{document} is not correlated with the slope of the Pomeron trajectory. Estimates for \documentclass[12pt]{minimal}
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\begin{document}$\Upsilon$\end{document} photoproduction at HERA are given.
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页码：461 / 467
页数：6
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