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Charged Kaon Production in Tau Lepton Decays


Mills, Geoffrey Blount (1986) Charged Kaon Production in Tau Lepton Decays. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/n2rv-ma10.


The result of an experiment performed at the PEP e+e- storage ring which operated at 29.0 GeV/c2 is presented. The DELCO detector, which emphasizes Cherenkov particle identification, is used to measured the production of charged kaons in τ decays. The branching ratio of the Cabibbo-suppressed decays b(τ± → K± ντ) = (0.57 ± 0.15)%, b(τ± → K± ντ + nπ0) = (1.59 ± 0.23)% n ≥ 0, and b(τ± → K±π+π-ντ0)) = (0.22+0.16-0.13)% are measured, and the branching ratio of the Cabibbo-favored decay b(τ± → K+K-π±ντ) = (0.22+0.17-0.11)% is measured. These branching ratio measurements provide a test e - µ - τ universality and are in agreement with and the predictions of SU(3) sum rules. The invariant mass distribution of the K+K-π system in the exclusive τ± → K+K-π±ντ channel is used to set a limit of 157 MeV/c2 at 95% CL on the τ neutrino mass.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Physics
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Barish, Barry C.
Thesis Committee:
  • Barish, Barry C. (chair)
  • Gomez, Ricardo
  • Preskill, John P.
  • Phillips, Thomas G.
Defense Date:12 June 1985
Record Number:CaltechTHESIS:04162019-142819748
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11470
Deposited By: Mel Ray
Deposited On:17 Apr 2019 14:25
Last Modified:16 Apr 2021 22:30

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