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No Sommerfeld resummation factor in e+e- -> ppbar ?

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arxiv 1008.0542 v1 pith:4BAANBIB submitted 2010-08-03 hep-ph

No Sommerfeld resummation factor in e+e- -> ppbar ?

classification hep-ph
keywords sommerfeldthresholddatafactorformulappbarresummationabove
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Sommerfeld rescattering formula is compared to the e+e- -> ppbar BaBar data at threshold and above. While there is the expected Coulomb enhancement at threshold, two unexpected outcomes have been found: |G^p (4M_p^2)|= 1, like for a pointlike fermion, and moreover data show that the resummation factor in the Sommerfeld formula is not needed. Other e+e- -> baryon-antibaryon cross sections show a similar behavior near threshold.

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