Missing mass analysis of the A?2 at 6.0 GeV/c |
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| Authors: | G Conforto MA Kramer D Underwood RM Mobley AW Key R Prepost DH Tompkins MS Witherell |
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| Institution: | 1. National Accelerator Laboratory, P.O. Box 500, Batavia, Ill. 60510, USA;2. Physics Department, University of Toronto, Toronto 181, Canada |
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| Abstract: | The missing mass spectrum in the region of the A?2 has been measured in the reaction π?p→X?p at 6.0 GeV/c in the interval 0.27 <|t|<0.42 (GeV/c)2, with an optical spark chamber system which simultaneously observed the decay X?→ηπ?. A signal of 230 events above background per five MeV interval is observed at the A2 peak, with a signal-to-background ratio of greater than 1:1. A single D-wave Breit-Wigner distribution with a quadratic background gives a good fit to the data, yielding the parameters M0=(1.324±0.003) GeV/c2 and Γ0=(0.104±0.009) GeV/c2. The spectrum is incompatible with a dipole shape. |
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