Precise Measurement of pi+ -> e+ nu Branching Ratio

Abstract

The PEN Collaboration is conducting a new measurement of the pi+ -> e+ nu branching ratio at the Paul Scherrer Institute, with the goal uncertainty of delta B/B(pie2)=5E-4 or lower. At present, the combined accuracy of all published pie2 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.

pdflatex, 11 pages, 5 figures, to be published in "Progress in High-Energy Physics and Nuclear Safety", NATO Science for Peace Series: B - Physics and Biophysics

References in corpus (7)

• The Standard Model prediction for R_{e/mu}^{(pi,K)}
• Precise Measurement of the Pi+ -> Pi0 e+ nu Branching Ratio
• Probing New Physics through mu-e Universality in K->lnu
• New Precise Measurement of the Pion Weak Form Factors in the Pi+ -> e+ nu gamma Decay
• Radiative Corrections to pi_{l2} and K_{l2} Decays
• Precise Measurement of the Pion Axial Form Factor in the Pi+ -> e+ nu gamma Decay
• Design, Commissioning and Performance of the PIBETA Detector at PSI