Protonium annihilation into π0π0 at rest in a liquid hydrogen target

M. Bargiotti, A. Bertin,Marco Bruschi, M. Capponi,S. De Castro, R. Donà,Laura Fabbri,Pietro Faccioli,D. Galli,Benedetto Giacobbe,Umberto Marini Bettolo Marconi, I. Massa,Massimo Piccinini,N. Semprini Cesari,Roberto Spighi,V. Vagnoni,Stefania Vecchi,Mauro Villa,A. Vitale,Antonio Zoccoli, M. Poli,Germano Bonomi,M.P. Bussa,M. Corradini,E. Lodi Rizzini, L. Venturelli,Aldo Zenoni,Corrado Cicalo,A. De Falco,Alberto Masoni,G. Puddu,S. Serci,G. L. Usai,O.E. Gorchakov,S.N. Prakhov,A.M. Rozhdestvensky,V.I. Tretyak,Paola Gianotti, C. Guaraldo, Armando Lanaro,V. Lucherini, C. Petrascu,R. A. Ricci, V. Filippini,Adriano Fontana,Paolo Montagna,Alberto Rotondi,Paola Salvini,F. Balestra,P. Cerello,O. Y. Denisov,L. Ferrero,R. Garfagnini, A. Grasso,A. Maggiora, A. Panzarasa,D. Panzieri,F. Tosello,M. Astrua,Elena Botta,Tullio Bressani,D. Calvo, A. Feliciello,A. Filippi,N. Mirfakhrai,S. Marcello,Michelangelo Agnello,Felice Iazzi

Physical Review D（2001）

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摘要

The annihilation frequency of the reaction p¯ p!p0p0 at rest in liquid hydrogen has been measured by the Obelix experiment by using different apparatus configurations and trigger conditions. The value obtained is f (p0p0, LH)5(2.860.1stat60.4syst)31024. With the same data samples, the p0h annihilation frequency has been determined to be f (p0h, LH)5(0.960.2stat60.1syst)31024. The results are discussed within the frame of the present experimental situation

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