Near-threshold structures in seven e+e- annihilation channels are simultaneously described by a single chiral-EFT N Nbar final-state interaction plus slowly varying short-distance sources, without channel-specific narrow resonances.
Study of e+e- --> p anti-p via initial-state radiation at BABAR
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abstract
The process e+e- --> p anti-p gamma is studied using 469 fb-1 of integrated luminosity collected with the BABAR detector at the PEP-II collider, at an e+e- center-of-mass energy of 10.6 GeV. From the analysis of the p anti-p invariant mass spectrum, the energy dependence of the cross section for e+e- --> p anti-p is measured from threshold to 4.5 GeV. The energy dependence of the ratio of electric and magnetic form factors, |G_E/G_M|, and the asymmetry in the proton angular distribution are measured for p anti-p masses below 3 GeV. We also measure the branching fractions for the decays J/psi --> p anti-p and psi(2S) --> p anti p.
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The Standard Model value for the muon anomalous magnetic moment is 116591810(43)×10^{-11}, 3.7σ below the Brookhaven experimental measurement.
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Understanding the near-threshold structures in $e^+e^- $ annihilation from a unified $N \bar N$-interaction perspective
Near-threshold structures in seven e+e- annihilation channels are simultaneously described by a single chiral-EFT N Nbar final-state interaction plus slowly varying short-distance sources, without channel-specific narrow resonances.
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The anomalous magnetic moment of the muon in the Standard Model
The Standard Model value for the muon anomalous magnetic moment is 116591810(43)×10^{-11}, 3.7σ below the Brookhaven experimental measurement.