A new determination of the pion mass

✍ Scribed by D. Anagnastopoulos; M. Augsburger; D. Belmiloud; G. Borchert; D. Chatellard; M. Daum; J.P. Egger; P. El-Khoury; R. Frosch; H. Gorke; D. Gotta; P. Hauser; P. Indelicato; K. Kirch; S. Lenz; T. Siems; L.M. Simons

• Book ID: 104336619
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 415 KB
• Volume: 626
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(97)00560-5

✦ Synopsis

Initial measurements concerning the feasibility of a new pion mass determination are described. In a first step, a high-resolution crystal spectrometer was coupled to a cyclotron trap which provides a high pion stopping density, sufficient to check predictions for the cascade process and to measure the stability of the apparatus. A comparison with the measured Cu I(~ fluorescence line resolves an ambiguity in the value of the pion mass. The preliminary result from this experiment is m~-= (139.57040 4-0.00045) MeV/c 2.