MEGA -- A search for {mu} {r_arrow} e{gamma}

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The MEGA experiment is a search for the decay {mu} {r_arrow} e{gamma}. Even though there is no fundamental reason to expect lepton number to be a conserved quantity, processes such as {mu} {r_arrow} e{gamma} have not been observed. (The present upper limit for the branching ratio for {mu} {r_arrow} e{gamma} is 4.9 x 10{sup {minus}11}.) The minimal standard model of electroweak interactions, which is enormously successful, builds in lepton number conservation. However, the decay {mu} {r_arrow} e{gamma} is expected in many extensions to the standard model, in particular in supersymmetry models. The experimental signature for {mu} {r_arrow} e{gamma} from decays ... continued below

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4 p.

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Mischke, R. E. December 1, 1998.

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Description

The MEGA experiment is a search for the decay {mu} {r_arrow} e{gamma}. Even though there is no fundamental reason to expect lepton number to be a conserved quantity, processes such as {mu} {r_arrow} e{gamma} have not been observed. (The present upper limit for the branching ratio for {mu} {r_arrow} e{gamma} is 4.9 x 10{sup {minus}11}.) The minimal standard model of electroweak interactions, which is enormously successful, builds in lepton number conservation. However, the decay {mu} {r_arrow} e{gamma} is expected in many extensions to the standard model, in particular in supersymmetry models. The experimental signature for {mu} {r_arrow} e{gamma} from decays at rest is the observation of a positron and photon, each of 52.8 MeV , that are back-to-back, in time coincidence, and originate from a common spatial point. The MEGA detector consists of two spectrometers designed to measure the kinematic characteristics of positrons and photons to search for events with this signature. The primary difficulty in the analysis of these data has been the development of reconstruction algorithms that balance efficiency and resolution. Also, many calibrations and corrections are needed to get optimum resolutions. Most surviving candidate events are accidentals. Results of analysis are given.

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4 p.

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INIS; OSTI as DE99000757

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  • JHF `98: workshop on physics at the JHF KEK, Tsukuba (Japan), 4-7 Mar 1998

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  • Other: DE99000757
  • Report No.: LA-UR--98-2113
  • Report No.: CONF-980372--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 677165
  • Archival Resource Key: ark:/67531/metadc708850

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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.

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  • December 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Aug. 23, 2016, 3:37 p.m.

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Mischke, R. E. MEGA -- A search for {mu} {r_arrow} e{gamma}, article, December 1, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc708850/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.