Abstract

The next generation of electron-hadron facilities has the potential for significantly improving our understanding of exotic hadrons. The XYZ states have not been seen in photon-induced reactions so far. Their observation in such processes would provide an independent confirmation of their existence and offer new insights into their internal structure. Based on the known experimental data and the well-established quarkonium and Regge phenomenology, we give estimates for the exclusive cross sections of several XYZ states. For energies near threshold we expect cross sections of few nanobarns for the Zc(3900)+ and upwards of tens of nanobarn for the X(3872), which are well within reach of new facilities.

Highlights

  • Since 2003, a plethora of new resonance candidates, commonly referred to as the XYZ, appeared in the heavy quarkonium spectrum

  • We aim at providing estimates for exclusive photoproduction cross sections of XYZ states in a wide kinematic range, from near threshold to that expected to be covered by the Electron-Ion Collider (EIC)

  • Since the many XYZ states have been seen with a varying degree of significance, we present numerical estimates for the few that are considered more robust, i.e., seen in more than one channel with high significance

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Summary

INTRODUCTION

Since 2003, a plethora of new resonance candidates, commonly referred to as the XYZ, appeared in the heavy quarkonium spectrum Their properties do not fit the expectations for heavy QQbound states as predicted by the conventional phenomenology. The majority of these has been observed in specific production channels, most notably in heavy hadron decays and direct production in eþe− collisions. We aim at providing estimates for exclusive photoproduction cross sections of XYZ states in a wide kinematic range, from near threshold to that expected to be covered by the EIC.

FORMALISM
Xð3872Þ AND χ c1ð1PÞ
PRODUCTION OF Xð3872Þ VIA PRIMAKOFF EFFECT
Xð6900Þ
Yð4260Þ AND ψð2SÞ
CONCLUSIONS
Background only
Full Text
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