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

6); A.M. Rozhdestvensky (2); A. Palladino (1); A.S. Korenchenko (2); A. van der Schaaf (7); D. Mekterovi\'c (4); D. Mzhavia (2; D. Po\v{c}ani\'c (1); E. Frle\v{z} (1); E.P. Velicheva (2)

arxiv: 0812.2829 · v1 · pith:J4G2USBDnew · submitted 2008-12-15 · ✦ hep-ex

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

E. Frle\v{z} (1) , L. P. Alonzi (1) , V. A. Baranov (2) , W. Bertl (3) , M. Bychkov (1) , Yu.M. Bystritsky (2) , N.V. Khomutov (2) , A.S. Korenchenko (2)

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S.M. Korenchenko (2) M. Korolija (4) T. Kozlowski (5) N.P. Kravchuk (2) N.A. Kuchinsky (2) D. Mekterovi\'c (4) D. Mzhavia (2 6) A. Palladino (1) D. Po\v{c}ani\'c (1) P. Robmann (7) A.M. Rozhdestvensky (2) V.V. Sidorkin (2) U. Straumann (7) I. Supek (4) P. Tru\"ol (7) A. van der Schaaf (7) E.P. Velicheva (2) V.P. Volnykh (2)

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keywords branchingmeasurementpie2ratioaccuracybehindcalculationcollaboration

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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.

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

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