Diquark Substructure in $\varphi$ Photoproduction

Abstract

Observed enhancements in the forward and backward directions for $\varphi$ meson photoproduction off nucleons are shown to be explainable by the production of a nonresonant recoiling $(su)$ diquark, $(\bar{s}ud)$ triquark pair. We show that the necessity of maintaining approximate collinearity of the quarks within these units constrains configurations with the minimum momentum transfer, and hence maximal amplitudes, to lie preferentially along the reaction axis.

9 pages, 7 eps figures, REVTeX. Version accepted by Phys. Rev. D. Clarifications and additional references added

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• Do the $P_c^{+}$ Pentaquarks Have Strange Siblings?
• Spectroscopy of Exotic Hadrons Formed from Dynamical Diquarks
• Triangular singularity and a possible $\varphi p$ resonance in the ${\Lambda }_c^{+}\to {\pi }^0\varphi p$ decay
• Search for ${\Lambda }_c^{+}\to \varphi p{\pi }^0$ and branching fraction measurement of ${\Lambda }_c^{+}\to K^{-}{\pi }^{+}p{\pi }^0$
• First measurement of coherent $\varphi$-meson photoproduction from helium-4 near threshold
• Spectrum and Structure of Excited Baryons with CLAS
• QCD sum rule study for hidden-strange pentaquarks
• Constituent Counting Rules and Exotic Hadrons