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Release | : 1985 |
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Download Search for the Neutrinoless Muon Decay. Mu. . --]. E. Gamma Book in PDF, ePub and Kindle
Separate muon, electron, and tau numbers are conserved in the minimal standard model of electroweak interactions with massless neutrinos. However, in many extensions to the standard model, separate lepton numbers are not expected to be conserved quantities. A new search for muon number non-conserving processes has been undertaken at the Los Alamos Meson Physics Facility (LAMPF), specifically to look for three neutrinoless decay modes of the muon. The search for the decay of a muon to an electron and a photon is discussed here. A new detector facility, located in the LAMPF stopped muon channel, was developed for this experiment. This Crystal Box detector consists of a cylindrical drift chamber surrounded by a plastic scintillator hodoscope and a large solid angle, modularized, NaI(Tl) calorimeter. The apparatus measures the trajectories, relative timing, and energies of charged particles and photons from the decays of positive muons stopped in a central target. The assembly and calibration of the detector are described, and the procedure for taking data is discussed. The sample of 1.3 million candidate events, from the first data run of the Crystal Box, was analyzed using a maximum-likelihood method. The upper limit on the branching ratio, relative to normal muon decay, for a muon decaying to an electron and a photon is found to be consistent with previous measurements. With 90% confidence, the branching ratio for this neutrinoless decay is observed to be less than 2.8 x 101°.
Author | : Steven L. Wilson |
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Total Pages | : 318 |
Release | : 1984 |
Genre | : Muons |
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Download A Search for the Neutrinoless Muon Decay [mu]+ --> E+ [gamma] Book in PDF, ePub and Kindle
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Release | : 1984 |
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Download Rare Muon Decays and Lepton-family Number Conservation Book in PDF, ePub and Kindle
A brief historical survey of the discovery of the muon, interest in neutrinoless processes, and lepton-number conservation laws is given. The present view of lepton-number conservation laws and the search for .mu. .-->. e.gamma. are described. Other experiments are discussed including .mu. .-->. ee+e− decay, .mu.−Z .-->. e−Z reactions, .mu. .-->. e .gamma gamma. decay, other rare muon processes, strangeness-changing muon-number-nonconserving decays, and tau decays. 52 references. (WHK).
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Release | : 2003 |
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Download Search for B --] Mu Anti-muon-neutrino Gamma and B --] E Anti-electron-neutrino Gamma Book in PDF, ePub and Kindle
We have searched for the decays B[yields][mu][bar[nu]][sub[mu]][gamma] and B[yields] e[bar[nu]][sub e][gamma] in a sample of 2.7 million charged B decays collected with the CLEO II detector. In the muon channel, we observe no candidates in the signal region and set an upper limit on the branching fraction of[Beta](B[yields][mu][bar[nu]][sub[mu]][gamma])
Author | : Colin P. Jessop |
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Total Pages | : 12 |
Release | : 2003 |
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Download Search for B --] Mu Anti-muon-neutrino Gamma and B --] E Anti-electron-neutrino Gamma Book in PDF, ePub and Kindle
We have searched for the decays B {yields} {mu}{bar {nu}}{sub {mu}}{gamma} and B {yields} e{bar {nu}}{sub e}{gamma} in a sample of 2.7 million charged B decays collected with the CLEO II detector. In the muon channel, we observe no candidates in the signal region and set an upper limit on the branching fraction of {Beta}(B {yields} {mu}{bar {nu}}{sub {mu}}{gamma})
Author | : David Paul Grosnick |
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Total Pages | : 216 |
Release | : 1987 |
Genre | : Muons |
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Download A Search for the Rare Decay [mu]+ --> E+[gamma][gamma] Book in PDF, ePub and Kindle
Author | : Fritz DeJongh |
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Total Pages | : 14 |
Release | : 2005 |
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Download A Method to Search for Mu --] E Gamma Decays with High Intensity Muon Sources Book in PDF, ePub and Kindle
Muon beamlines such as the one being designed for the MECO experiment will provide a large increase in muon stopping rates, allowing for possible large increases in sensitivity to {mu} {yields} e{gamma}. As higher-power proton-drivers become available, even higher rates will become possible. We have analyzed the capabilities of a detector for {mu} {yields} e{gamma} using pixel detectors to track the positron, and a conversion pair from the photon. We find that an initial detector with a beamline comparable to MECO and 10% of the coverage of the MEGA experiment can already be competitive with experiments currently under construction with a modest amount of live-time. By increasing the coverage and running longer, it should be possible to go further. We have found that the accidental backgrounds depend strongly on the thickness of the photon converter, providing a way to make continued major progress as improved pixel detectors and more intense muon sources become available.
Author | : Howard Fred Davis |
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Total Pages | : 248 |
Release | : 1960 |
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Download Search for the Decay [mu] --> E + [gamma]. Book in PDF, ePub and Kindle
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Release | : 2006 |
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Download A Method to Search for Mu --] E Gamma Decays with High Intensity Muon Sources Book in PDF, ePub and Kindle
Abstract Not Provided.
Author | : Philip Michael Tuts |
Publisher | : |
Total Pages | : 186 |
Release | : 1979 |
Genre | : Muons |
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Download Search for the Rare Decay [muon](+)[decays To] E(+̳)+[gamma] Book in PDF, ePub and Kindle