Search for. mu. /sup +/. -->. e/sup +/. gamma. [Branching ratio upper limit]

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Using the Stopped Muon Channel at LAMPF to produce a surface muon beam, 2.3 x 10/sup 12/ muons were stopped in a 50 mg/cm/sup 2/ target. The solid angle-efficiency product of the detector for the rare decay ..mu../sup +/ ..-->.. e/sup +/..gamma.. was 1.2%. Hence, 3 x 10/sup 10/ ..mu../sup +/ decays were examined. There is no indication of any signal, the data being consistent with a small background of random electron and gamma coincidences. The new upper limit on the branching ratio is GAMMA(..mu../sup +/ ..-->.. e/sup +/..gamma..)/GAMMA(..mu../sup +/ ..-->.. e/sup +/..nu../sub e/..nu../sup -//sub mu/) < 2 x 10/sup ... continued below

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Pages: 28

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Cooper, M.D. January 1, 1978.

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Description

Using the Stopped Muon Channel at LAMPF to produce a surface muon beam, 2.3 x 10/sup 12/ muons were stopped in a 50 mg/cm/sup 2/ target. The solid angle-efficiency product of the detector for the rare decay ..mu../sup +/ ..-->.. e/sup +/..gamma.. was 1.2%. Hence, 3 x 10/sup 10/ ..mu../sup +/ decays were examined. There is no indication of any signal, the data being consistent with a small background of random electron and gamma coincidences. The new upper limit on the branching ratio is GAMMA(..mu../sup +/ ..-->.. e/sup +/..gamma..)/GAMMA(..mu../sup +/ ..-->.. e/sup +/..nu../sub e/..nu../sup -//sub mu/) < 2 x 10/sup -10/ with 90% confidence. 8 references.1

Physical Description

Pages: 28

Notes

Dep. NTIS, PC A03/MF A01.

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  • SLAC conference on weak interactions, Stanford, CA, USA, 10 Jul 1978

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  • Report No.: LA-UR-78-2631
  • Report No.: CONF-780769-1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 6417019
  • Archival Resource Key: ark:/67531/metadc1205565

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • January 1, 1978

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

Description Last Updated

  • Oct. 25, 2018, 3:25 p.m.

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Cooper, M.D. Search for. mu. /sup +/. -->. e/sup +/. gamma. [Branching ratio upper limit], article, January 1, 1978; United States. (digital.library.unt.edu/ark:/67531/metadc1205565/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.