Abstract
The Sommerfeld rescattering formula is compared to the \(e^ + e^ - \to p\bar p\) BABAR data at threshold and above. While there is the expected Coulomb enhancement at threshold, two unexpected outcomes have been found: the modulus of the proton form factor is normalized to one at threshold, i.e. |G p(4M 2 p )| = 1, as 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 similar behavior near threshold.
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Baldini Ferroli, R., Pacetti, S. & Zallo, A. No Sommerfeld resummation factor in \(e^ + e^ - \to p\bar p\)?. Eur. Phys. J. A 48, 33 (2012). https://doi.org/10.1140/epja/i2012-12033-6
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DOI: https://doi.org/10.1140/epja/i2012-12033-6