Electron-positron annihilation into hadron-antihadron pairs
نویسندگان
چکیده
منابع مشابه
On Electron-Positron Annihilation into Nucleon-Antinucleon Pairs
We discuss the puzzling experimental results on baryon-antibaryon production in e+e− annihilation close to the threshold, in particular the fact that σ(e+e− → n̄n) >∼ σ(e+e− → p̄p). We discuss an interpretation in terms of a two-step process, via an intermediate coherent isovector state serving as an intermediary between e+e− and the baryon-antibaryon system. We provide evidence that the isovecto...
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Annihilation of the electron-positron pairs (or (e−, e)−pairs, for short) in various polyelectrons e n e− m = e− m e n (where n ≥ 1 and m ≥ 1) is considered. In particular, we discuss the threeand four-photon annihilation of the (e−, e)−pairs in the three-body Ps− ion and four-body bi-positronium system Ps2. It is shown that the five-body e + 2 e − 3 ion is an unbound system. The closed form ex...
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The Monte Carlo event generator PHOKHARA, which simulates hadron and muon production at electron-positron colliders through radiative return, has been extended to final states with three pions. A model for the form factor based on generalized vector dominance has been employed, which is consistent with presently available experimental observations.
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In this article the final-state radiation (FSR) of the hard photon in e−(p1) + e(p2) → γ ∗(Q) → π(p+) + π −(p−) + γ(k) reaction is considered in the framework of ChPT with vector ρ and axial–vector a1 mesons 1) (the FSR diagrams are shown in Fig.1). Our consideration of FSR is motivated by the necessity to study model dependence of the next-to-leading order hadronic contribution a μ to anomalou...
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ژورنال
عنوان ژورنال: Physical Review C
سال: 2005
ISSN: 0556-2813,1089-490X
DOI: 10.1103/physrevc.71.025204