Abstract
The PEN Collaboration is conducting a new measurement of the π+ → e + vL branching ratio at the Paul Scherrer Institute, with the goal uncertainty of δB/B πe2 = 5 × 10−4 or lower. At present, the combined accuracy of all published πe2 decay measurements lags behind the theoretical calculation by a factor of 40. In this contribution we report on the PEN detector configuration and its performance during two development runs done in 2007 and 2008.
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PEN Collaboration: Precise Measurement of the π+ → e + v Branching Ratio. Paul Scherrer Institute Proposal R-05-01. Available at http://pen.phys.virginia.edu/proposal/ pen_proposal.pdf.
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Frlež, E. et al. (2009). Precise Measurement of the π+ → e + v Branching Ratio. In: Begun, V., Jenkovszky, L.L., Polański, A. (eds) Progress in HighEnergy Physics and Nuclear Safety. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2287-5_10
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DOI: https://doi.org/10.1007/978-90-481-2287-5_10
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