ar X iv : 0 90 3 . 03 01 v 1 [ he p - ph ] 2 M ar 2 00 9 ∆ contribution in e + + e − → p + p̄ at small s Hai
نویسندگان
چکیده
Two-photon annihilate contributions in the process e + e− → p+ p̄ including N and ∆ intermediate are discussed in a simple hadronic model. The corrections to the unpolarized cross section and polarized observables Px, Pz are presented. The results show the two-photon annihilate correction to unpolarized cross section is small and its angle dependence becomes weak at small s after considering the N and ∆(1232) contributions simultaneously, while the correction to Pz is enhanced. PACS numbers: 13.40.Gp, 13.60.-r, 25.30.-c.
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