Measurement of the K+ --> pi+ nu nu branching ratio

Journal Article · Sat Mar 01 04:00:00 EST 2008 · Phys.Rev.D77:052003,2008

DOI:https://doi.org/10.1103/PhysRevD.77.052003· OSTI ID:925918

Adler, S; Anisimovsky, V V; Aoki, M; Ardebili, M; Artamonov, A V; Atiya, M; Bassalleck, B; Bazarko, A O; Bhuyan, B; Blackmore, E W; Bryman, D A

Experiment E949 at Brookhaven National Laboratory studied the rare decay K{sup +}-->pi{sup +} nu{ovr {nu}} and other processes with an exposure of 1.77 x 10{sup 12} k{sup +}'s. The data were analyzed using a blind analysis technique yielding one candidate event with an estimated background of 0.30 {+-} 0.03 events. Combining this result with the observation of two candidate events by the predecessor experiment E787 gave the branching ratio B(K{sup +}-->pi{sup +} nu{ovr {nu}}) = (1.47{sub -0.89}{sup +1.30}) x 10{sup -10}, consistent with the standard model prediction of (0.74 {+-} 0.20) x 10{sup -10}. This is a more detailed report of results previously published [V.V. Anisimovsky et al., Phys. Rev. Lett. 93, 031801 (2004)].

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 925918
• Report Number(s): FERMILAB-PUB-08-065-CD-E
• Journal Information: Phys.Rev.D77:052003,2008, Journal Name: Phys.Rev.D77:052003,2008 Journal Issue: 5 Vol. 77; ISSN 1550-7998
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BNL
BRANCHING RATIO
DECAY
Experiment-HEP
FORECASTING
STANDARD MODEL