Search for right-handed currents in muon decay

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Limits are reported on charged right-handed currents, based on precise measurement of the endpoint e/sup +/ spectrum in ..mu../sup +/ decay. Highly polarized ..mu../sup +/ from the TRIUMF ''surface'' muon beam were stopped in high purity metal foils and liquid He targets selected to minimize depolarization effects. Decay e/sup +/ emitted within 160 mrad of the beam direction were momentum-analyzed to 0.15%. Muons were stopped within either a spin-processing transverse field (70-G or 110-G) or a spin-holding longitudinal field (0.3-T or 1.1-T). Data collected with the spin-precessing field were used for the momentum calibration of the spectrometer. The spin-held data ... continued below

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Pages: 115

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Jodidio, A.E. January 1, 1986.

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Limits are reported on charged right-handed currents, based on precise measurement of the endpoint e/sup +/ spectrum in ..mu../sup +/ decay. Highly polarized ..mu../sup +/ from the TRIUMF ''surface'' muon beam were stopped in high purity metal foils and liquid He targets selected to minimize depolarization effects. Decay e/sup +/ emitted within 160 mrad of the beam direction were momentum-analyzed to 0.15%. Muons were stopped within either a spin-processing transverse field (70-G or 110-G) or a spin-holding longitudinal field (0.3-T or 1.1-T). Data collected with the spin-precessing field were used for the momentum calibration of the spectrometer. The spin-held data were used to measure the relative e/sup +/ rate at the endpoint. An extrapolation was made to extract the endpoint rate opposite to the ..mu../sup +/ spin. In terms of the standard muon decay parameters this rate is given by (1-xi P/sub ..mu../delta/rho) where P/sub ..mu../ is muon polarization. The result for xi P/sub ..mu../delta was consistent with the V-A prediction of 1. It is quoted as a 90% confidence lower limit xi P/sub ..mu../delta/rho > 0.9975 since we are unable to correct for all possible sources of muon depolarization. For the model with manifest left-right symmetry and massless neutrinos the result implies 90% confidence limits m(W/sub 2/) > 432 GeV/c/sup 2/ and -0.050 < xi < 0.035, where W/sub 2/ is the predominantly right-handed boson and xi is the left-right mixing angle. With the assumption of no left-right mixing an equivalent 90% confidence upper limit of 0.025 is obtained on the absolute value of the ratio of a possible V+A amplitude to the dominant V-A amplitude in muon and pion decays. Limits are also deduced on the nu/sub ..mu..L/ mass and helicity in ..pi../sup +/ decay, non-(V-A) couplings in helicity projection form, the mass scale of composite leptons, and the branching ratio for ..-->.. e+f where f (familon) is the neutral massless Nambu-Goldstone boson associated with flavor symmetry breaking. 39 refs., 12 figs.

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Pages: 115

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NTIS, PC A06/MF A01.

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  • Other Information: Thesis

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  • Other: DE86008399
  • Report No.: LBL-21084
  • Grant Number: AC02-76ER02289
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/6006947 | External Link
  • Office of Scientific & Technical Information Report Number: 6006947
  • Archival Resource Key: ark:/67531/metadc1099840

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  • January 1, 1986

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • April 25, 2018, 1:54 p.m.

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Jodidio, A.E. Search for right-handed currents in muon decay, report, January 1, 1986; [Berkeley,] California. (digital.library.unt.edu/ark:/67531/metadc1099840/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.