The dominant contribution to the pi(0) --> 4 gamma branching ratio, coming from purely electromagnetic photon-splitting graph, is calculated. The result Br(pi(0) --> 4 gamma) similar or equal to (2.6 +/- 0.1) . 10(-11) is about three orders of magnitude below the present experimental limit.
机构:
St Petersburg State Univ, VA Fock Inst Phys, St Petersburg 198504, RussiaSt Petersburg State Univ, VA Fock Inst Phys, St Petersburg 198504, Russia
Solovyev, D.
Labzowsky, L.
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St Petersburg State Univ, VA Fock Inst Phys, St Petersburg 198504, Russia
Petersburg Nucl Phys Inst, St Petersburg 188300, RussiaSt Petersburg State Univ, VA Fock Inst Phys, St Petersburg 198504, Russia
机构:
Peking Univ, Dept Phys, Beijing 100871, Peoples R China
Peking Univ, State Key Lab Mesoscop Phy, Beijing 100871, Peoples R ChinaPeking Univ, Dept Phys, Beijing 100871, Peoples R China
Wang Ruo-Peng
Zhang Hui-Rong
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Peking Univ, Dept Phys, Beijing 100871, Peoples R China
Peking Univ, State Key Lab Mesoscop Phy, Beijing 100871, Peoples R ChinaPeking Univ, Dept Phys, Beijing 100871, Peoples R China
机构:
Univ Fed Fluminense, Inst Fis, Av Gal Milton Tavares de Souza S-N, BR-24210340 Niteroi, RJ, Brazil
Int Iberian Nanotechnol Lab INL, Av Mestre Jose Veiga, P-4715330 Braga, PortugalSapienza Univ Roma, Dipartimento Fis, Piazzale Aldo Moro 5, I-00185 Rome, Italy