Unitarity constraints on charged pion photoproduction at large p(perpendicular to)

作者：Laget J M^*

来源：Physics Letters B, 2010, 685(2-3): 146-150.

DOI：10.1016/j.physletb.2010.01.052

Around theta(pi) = 90 degrees, the coupling to the rho N-0 channel leads to a good accounting of the charged pion exclusive photoproduction cross section in the energy range 3 < E-gamma < 10 GeV. where experimental data exist. Starting from a Regge pole approach that successfully describes vector meson production, the singular part of the corresponding box diagrams (where the intermediate vector meson-baryon pair propagates on-shell) is evaluated without any further assumptions (unitarity). Such a treatment provides an explanation of the s(-7) scaling of the cross section. Elastic rescattering of the charged pion improves the basic Regge pole model at forward and backward angles.

• 出版日期2010-3-1