Unitary constraints on charged pion photoproduction at large p⊥
Around $$\theta_{\pi}=$$90$$^\circ$$, the coupling to the $$\rho^\circ N$$ channel leads to a good accounting of the charged pion exclusive photoproduction cross section in the energy range 3 < Eγ < 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. Furthermore, elastic rescattering of the charged pion improves the basic Regge pole model at forward and backward angles.
- Authors:
-
[1]
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Publication Date:
- Report Number(s):
- JLAB-THY-09-1112; DOE/OR/23177-1060
Journal ID: ISSN 0370-2693; TRN: US201013%%913
- Grant/Contract Number:
- AC05-06OR23177
- Type:
- Accepted Manuscript
- Journal Name:
- Physics Letters. Section B
- Additional Journal Information:
- Journal Volume: 685; Journal Issue: 2-3; Journal ID: ISSN 0370-2693
- Publisher:
- Elsevier
- Research Org:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
- Sponsoring Org:
- USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCOUNTING; BASIC; COUPLING; CROSS SECTIONS; DIAGRAMS; ENERGY RANGE; EXPERIMENTAL DATA; PHOTOPRODUCTION; PIONS; PRODUCTION; REGGE POLES; RESCATTERING; SCALING; UNITARITY; VECTOR MESONS; VECTORS
- OSTI Identifier:
- 982215
- Free Publicly Accessible Full Text
-
Accepted Manuscript (DOE)
- Publisher's Version of Record
- https://doi.org/10.1016/j.physletb.2010.01.052