Single and multinucleon antiproton–4He annihilation at rest

✍ Scribed by P. Montagna; G. Bendiscioli; V. Filippini; A. Fontana; A. Rotondi; P. Salvini; A. Panzarasa; M. Bargiotti; A. Bertin; M. Bruschi; M. Capponi; S. De Castro; L. Fabbri; P. Faccioli; D. Galli; B. Giacobbe; U. Marconi; M. Piccinini; N. Semprini Cesari; R. Spighi; S. Vecchi; V. Vagnoni; M. Villa; A. Vitale; A. Zoccoli; A. Bianconi; G. Bonomi; M.P. Bussa; A. Donzella; L. Venturelli; A. Zenoni; C. Cicalò; A. De Falco; A. Masoni; G. Puddu; S. Serci; G. Usai; O.E. Gorchakov; A.M. Rozhdestvensky; V.I. Tretyak; P. Gianotti; C. Guaraldo; A. Lanaro; V. Lucherini; C. Petrascu; V.G. Ableev; C. Cavion; G. Vedovato; F. Balestra; L. Busso; P. Cerello; O. Denisov; L. Ferrero; R. Garfagnini; A. Grasso; A. Maggiora; D. Panzieri; M. Astrua; E. Botta; T. Bressani; D. Calvo; A. Feliciello; A. Filippi; S. Marcello; M. Agnello; F. Iazzi; N. Mirfakhrai

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 650 KB
• Volume: 700
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(01)01302-1

✦ Synopsis

The p annihilation at rest in a NTP 4 He-gas target has been studied by means of the Obelix spectrometer installed at the LEAR accelerator of CERN. Reactions with production of 2π -2π + , 2π -3π + , 2π -2π + p, 2π -π + 2p, 2π -3p (with p π > 80 MeV/c and p p > 300 MeV/c) have been selected and single-and multinucleon annihilations identified. For the first time some known mesonic and baryonic resonances have been observed in p4 He annihilations and branching ratios are evaluated for a number of reaction channels.