Study of {tau} Decays to Four-Hadron Final States with Kaons

Journal Article · Fri Jun 24 04:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.94.241802· OSTI ID:20696396

Arms, K; Gan, K K ^[1]; Severini, H ^[2]; Asner, D M; Dytman, S A; Love, W; Mehrabyan, S; Mueller, J A; Savinov, V ^[3]; Li, Z; Lopez, A; Mendez, H; Ramirez, J ^[4]; Huang, G S; Miller, D H; Pavlunin, V; Sanghi, B; Shibata, E I; Shipsey, I P.J. ^[5]; Adams, G S ^[6]

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1. Ohio State University, Columbus, Ohio 43210 (United States)
2. University of Oklahoma, Norman, Oklahoma 73019 (United States)
3. University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States)
4. University of Puerto Rico, Mayaguez, 00681 (Puerto Rico)
5. Purdue University, West Lafayette, Indiana 47907 (United States)
6. Rensselaer Polytechnic Institute, Troy, New York 12180 (United States); and others

The rare {tau} lepton decays to four explicitly identified hadrons have been studied with the CLEO detector at the Cornell Electron Storage Ring using (7.56{+-}0.15) fb{sup -1} of data collected near {radical}(s)=10.58 GeV. The first statistically significant measurements of B({tau}{sup -}{yields}K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0}{nu}{sub {tau}},excludingK{sup 0})=(7.4{+-}0.8{+-}1.1)= x10{sup -4} and B({tau}{sup -}{yields}K{sup -}K{sup +}{pi}{sup -}{pi}{sup 0}{nu}{sub {tau}})=(5.5{+-}1.4{+-}1.2)x10{sup -5} are presented, including the first observation of the decay {tau}{sup -}{yields}K{sup -}{omega}{nu}{sub {tau}} with branching fraction (4.1{+-}0.6{+-}0.7)x10{sup -4}. We publish the first upper limit for B({tau}{sup -}{yields}K{sup -}K{sup +}K{sup -}{pi}{sup 0}{nu}{sub {tau}})<4.8(6.1)x10{sup -6} at 90% (95%) confidence level. We measure for the first time the invariant mass distributions, which together with the branching fraction measurements are important ingredients that can be used to extract the standard model parameters, the strange quark mass, and the Cabibbo-Kobayashi-Maskawa element V{sub us}.

• OSTI ID: 20696396
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 94; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
CABIBBO ANGLE
CESR STORAGE RING
GEV RANGE 10-100
KAONS MINUS
KAONS NEUTRAL
KAONS PLUS
KOBAYASHI-MASKAWA MATRIX
MASS
MASS DISTRIBUTION
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PIONS MINUS
PIONS PLUS
S QUARKS
SEMILEPTONIC DECAY
STANDARD MODEL
TAU NEUTRINOS
TAU PARTICLES