Improved measurement of the K+ ---> pi+ nu anti-nu branching ratio

Anisimovsky, V. V.

doi:10.1103/PhysRevLett.93.031801

Title: Improved measurement of the K+ ---> pi+ nu anti-nu branching ratio

Journal Article · Mon Mar 01 00:00:00 EST 2004 · Phys.Rev.Lett.

DOI:https://doi.org/10.1103/PhysRevLett.93.031801· OSTI ID:1893385

Anisimovsky, V. V.

An additional event near the upper kinematic limit for K+ to pi+ nu nubar has been observed by Experiment E949 at Brookhaven National Laboratory. Combining previously reported and new data, the branching ratio is B(K+ to pi+ nu nubar)= 1.47 (+1.30, - 0.89) x 10-10 based on three events observed in the pion momentum region 211<229 MeV/c. At the measured central value of the branching ratio, the additional event had a signal-to-background ratio of 0.9.

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: E949

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1893385

Report Number(s):: BNL-72164-2004-JA; KEK-PREPRINT-2004-2; TRI-PP-04-07; FERMILAB-PUB-04-173-E; arXiv:hep-ex/0403036; oai:inspirehep.net:646902

Journal Information:: Phys.Rev.Lett., Vol. 93

Country of Publication:: United States

Language:: English

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