Inclusive measurement of $\bar p$ annihilation at rest in gaseous hydrogen to final states containingρ andf₂

R. Adler,T. Alhalel,A. Angelopoulos,A. Apostolakis,E. Aslanides,G. Backenstoss, C. P. Bee,O. Behnke,J. Bennet,V. Bertin,J. K. Bienlein, P. Bloch,Ch. Bula, P. Carlson,J. Carvalho,E. Cawley,S. Charalambous,M. Chardalas,G. Chardin,M. B. Chertok,M. Danielsson,A. Cody,S. Dedoussis, M. Dejardin,J. Derre,M. Dodgson,J. C. Dousse,J. Duclos,A. Ealet,B. Eckart,C. Eleftheriadis,I. Evangelou,L. Faravel, P. Fassnacht, J. L. Faure,C. Felder,R. Ferreira-Marques,W. Fetscher,M. Fidecaro,A. Filipčič,D. Francis,J. Fry,C. Fuglesang, E. Gabathuler,R. Gamet,D. Garreta, T. Geralis,H.-J. Gerber,A. Go,P. Gumplinger, C. Guyot,P. F. Harrisch,A. Haselden,P. J. Hayman,F. Henry-Couannier,W. G. Heyes,R. W. Hollander,K. Jansson,H. U. Johner,K. Jon-And,A. Kerek,J. Kern,P. R. Kettle,C. Kochowski, P. Kokkas,R. Kreuger,T. Lawry,R. Le Gac,A. Liolios,E. Machado,P. Maley,I. Mandić,N. Manthos,G. Marel, M. Mikuž,J. Miller,F. Montanet,T. Nakada,A. Onofre,B. Pagels,P. Pavlopoulos,F. Pelucchi,J. Pinto da Cunha,A. Policarpo,G. Polivka,H. Postma,R. Richkenbach,B. L. Roberts,E. Rozaki,T. Ruf,L. Sacks,L. Sakeliou,P. Sanders, C. Santoni,K. Sarigiannis,M. Schäfer,L. A. Schaller,A. Schopper,P. Schune,A. Soares, L. Tauscher,C. Thibault, F. Touchard, C. Touramanis,F. Triantis,D. A. Tröster,E. Van Beveren,C. W. E. Van Eijk,G. Varner, S. Vlachos,P. Weber,O. Wigger,C. Witzig,M. Wolter,C. Yeche, D. Zavrtanik,D. Zimmerman

msra（1995）

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摘要

Antiproton annihilation at rest in gaseous hydrogen (16 bar pressure) to the final states ρ(770)X andf2(1270)X, whereX stands for one or more neutral mesons, has been studied at LEAR using the CPLEAR detector. Relative branching ratios are given forX =π0,2π0, 3π0 ω in the ρ case, and forX =π0, η in thef2 case. The annihilation channel $\bar pp \to \rho 3\pi ^0$ has not been measured before. The fraction of P-wave annihilation is deduced from the ratiof2π0/ρπ0 to be 0.38±0.07, in good agreement with the result previously obtained by CPLEAR from the ratioK+K-/π+π-.

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Inclusive measurement of annihilation at rest in gaseous hydrogen to final states containingρ andf2

Inclusive measurement of $\bar p$ annihilation at rest in gaseous hydrogen to final states containingρ andf₂