BaBar results on e+e- --> ppbar by means of initial state radiation
Abstract
BaBar has measured with unprecedented accuracy the e+e- --> ppbar cross section from the threshold up to Q2 ~ 20 GeV2/c4, finding out an unexpected cross section, with plateaux and negative steps. Evidence for a ratio |GE/GM|>1 has also been found as well as a sudden variation in |GM| just above the threshold.
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