Search

Your search keyword '"T. Numao"' showing total 8 results
Start Over Author "T. Numao" Journal aip conference proceedings
8 results on '"T. Numao"'

1. PIENU experiment at TRIUMF: A sensitive probe of new physics

Author

T. Numao, Dave Britton, S. H. Kettell, Koji Yamada, N. Ito, Song Chen, D. Vavilov, Y. Yoshida, Y. Igarashi, T. Sullivan, C. Malbrunot, A.H. Hussein, Luca Doria, Masaharu Aoki, J. R. Comfort, Alexis A. Aguilar-Arevalo, A. Sher, R. E. Mischke, Douglas Bryman, L. S. Littenberg, Leonid Kurchaninov, P. Gumplinger, S. Ito, A. Sandorfi, D. von Bruch, M. Ding, Y. Kuno, and M. Blecher

Subjects
Nuclear physics, Physics, Particle physics, Effective mass (solid-state physics), Pion, Branching fraction, Physics beyond the Standard Model, High Energy Physics::Experiment, Mass scale, Weak interaction
Abstract

A TRIUMF experiment, PIENU, which aims to measure the branching ratio of pion decays, R = Γ(π→eν+eνγ)/Γ(π→μν+μνγ) to a precision of 0.1% or better is described. Such a measurement provides the best test of electron-muon universality in weak interactions and is sensitive to an effective mass scale of up to 1000 TeV in new physics.

Published
2013

2. Measurement of the pion branching ratio at TRIUMF

Author

C. Malbrunot, P. Gumplinger, Alexis A. Aguilar-Arevalo, T. Numao, Makoto Yoshida, D. Vavilov, Dave Britton, J. R. Comfort, Masaharu Aoki, S. Ito, Leonid Kurchaninov, Douglas Bryman, T. Sullivan, L. Littenberg, Y. Igarashi, M. Blecher, Luca Doria, S. Kettell, A. Sher, Song Chen, A.H. Hussein, M. Ding, and Y. Kuno

Subjects
Physics, Nuclear physics, Particle physics, Pion, Branching fraction, Hadron, Weak interaction, Universality (dynamical systems)
Abstract

The branching ratio of pion decays, R = Γ(π+→e+νe+π+→e+νeγ)Γ(π+→μ+νμ+π+→μ+νμγ is one of the most accurately calculated decay processes involving hadrons and has provided one of the most stringent tests of the hypothesis of electron-muon universality in weak interactions. The current experimental branching ratio Rexp = (1.230±0.004)×10−4 is 40 times less precise than the theoretical prediction RSM = 1.2352(1)10−4. The TRIUMF PIENU experiment aims at measuring the pion branching ratio with a precision improved by at least a factor five.

Published
2012

3. Massive neutrino search in the decay π[sup +]→e[sup +]ν

Author

R. Poutissou, Song Chen, Makoto Yoshida, L. S. Littenberg, S. H. Kettell, Y. Igarashi, N. Ito, P. Gumplinger, C. Hurst, T. Numao, A. Sher, Luca Doria, Koji Yamada, Leonid Kurchaninov, T. Sullivan, M. Blecher, D. V. Vavilov, M. Ding, Masaharu Aoki, Chloé Malbrunot, Douglas Bryman, and Ahmed Hussein

Subjects
Nuclear physics, Physics, Particle physics, Spectrum (functional analysis), Pontecorvo–Maki–Nakagawa–Sakata matrix, High Energy Physics::Experiment, Decay chain, Neutrino, Neutrino oscillation
Abstract

Evidence of massive neutrinos in the π+→e+ν decay spectrum was sought with the background π+→μ+→e+ decay chain highly suppressed. Upper limits (90% C.L.) on the neutrino mixing matrix element |Uei|2 in the neutrino mass region 60-129 MeV/c2 were set at the level of 10−8.

Published
2012

4. Recent results on rare K+ decays from BNL E787

Author

T. Numao, I. H. Chiang, K. K. Li, A. S. Turcot, T. F. Kycia, Douglas Bryman, Ewart W. Blackmore, F. C. Shoemaker, W. C. Louis, M. S. Atiya, M. M. Ito, Mats A Selen, P. Kitching, J. M. Poutissou, Daniel Robert Marlow, J. S. Haggerty, R. C. Strand, A. Konaka, J. S. Frank, R. Soluk, L. Felawka, A. J.S. Smith, R. Poutissou, L. S. Littenberg, D. S. Akerib, Y. Kuno, A. Sambamurti, Peter Daniel Meyers, J. Roy, J. A. Macdonald, A. J. Stevens, and P. Padley

Subjects
Physics, Nuclear physics, Particle decay, Particle physics, Upgrade, Branching fraction, National laboratory, Standard Model
Abstract

Experiment 787, now in progress at Brookhaven National Laboratory (BNL), is designed to measure the process K+→π+νν. A preliminary upper limit for this process was recently obtained Γ(K+→π+νν/Γ(K+→all)

Published
1992

6. A study of the decay π→vν

Author

Y. Kuno, A. Olin, M. Dixit, R. A. Burnham, T. Numao, J. A. Macdonald, A. Ahmad, Dave Britton, E. T. H. Clifford, A. ‐M. Poutissou, J. Summhammer, C. E. Picciotto, Douglas Bryman, and P. Kitching

Subjects
Nuclear physics, Physics, Particle physics, Pion, Positron, Branching fraction, High Energy Physics::Phenomenology, Electroweak interaction, High Energy Physics::Experiment, Electron, Neutrino, Standard Model
Abstract

A new measurement of the π→eν branching ratio is described. The π→eν positron spectrum, in which the background from μ→eνν has been highly suppressed, has been examined for evidence of massive neutrinos and and other exotic processes postulated in extensions to the standard model of electroweak interactions.

Published
1988

7. The time projection chamber at triumf

Author

M. J. Leitch, J. A. Macdonald, K. Gotow, M. Blecher, M. S. Dixit, H. Mes, R. Poutissou, A. Burnham, T. Numao, Georges Azuelos, J. Spuller, Douglas Bryman, M. D. Hasinoff, R. Skegg, A. Bennett, C. K. Hargrove, P. Schlatter, P. Depommier, I. Navon, J. P. Martin, A.L. Carter, and J. M. Poutissou

Subjects
Physics, Optics, Time projection chamber, Physics::Instrumentation and Detectors, business.industry, Ionization, Electron, Diffusion (business), business, Space charge, Magnetic field, Ion, Anode
Abstract

The time projection chamber at TRIUMF is being used to search for muon‐electron conversion. The best spatial resolution in the TPC, σ≂200 μm, occurs at the minimum drift length and for an optimum track‐to‐anode crossing angle determined by the magnetic field. The observed resolution is dependent on th diffusion of the drifting electrons, the track‐to‐anode crossing angle, E↘×B↘ effects near the anode wire and the discrete nature of the ionization process. Distortions due to positive ions leaking back into the drift volume from the anode wire region have been nearly eliminated by the use of a pulsed dual grid system.

Published
1984

8. Search for muon‐electron and muon‐positron conversion

Author

R. Poutissou, J. Spuller, J. A. Macdonald, M. J. Leitch, I. Navon, P. Depommier, J. M. Poutissou, M. Blecher, Georges Azuelos, E. T. H. Clifford, C. K. Hargrove, K. Gotow, M. S. Dixit, R. A. Burnham, J. Summhammer, P. Schlatter, T. Numao, H. Mes, Douglas Bryman, Shafqat Ahmad, and M. D. Hasinoff

Subjects
Nuclear physics, Physics, Nuclear reaction, Antiparticle, Positron, Muon, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Antimatter, Analytical chemistry, Elementary particle, Lepton, Muon capture
Abstract

Limits on the lepton flavor violating reactions ..mu../sup -/+Z..-->..e/sup -/+Z and ..mu../sup -/+Z..-->..e/sup +/+(Z-2), muon-electron and muon-position conversion, have been obtained. Upper limits (90% C.L.) for the branching ratios compared to ordinary muon capture are: R/sub -/(Ti) = GAMMA(..mu../sup -/Ti..-->..e/sup -/Ti)/GAMMA(..mu../sup -/Ti capture) ..d/sup +/Ca*)/GAMMA(..mu../sup -/Ti capture)

Published
1988

Catalog

Books, media, physical & digital resources
See catalog results