Experimental Test of Lepton Universality in tau Decay | Zendy

Colin P Jessop | Zendy

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Experimental Test of Lepton Universality in tau Decay

Author(s) -

Colin P Jessop

Publication year - 2003

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/813124

Subject(s) - physics , lepton , branching fraction , universality (dynamical systems) , particle physics , nuclear physics , neutrino , charged particle , beta decay , charged current , coupling constant , beta (programming language) , ion , electron , condensed matter physics , quantum mechanics , computer science , programming language

The branching fractions for {tau} {yields} e{nu}{nu}{sub {tau}} and h{nu}{sub {tau}} are measured using data collected with the CLEO detector at the CESR e{sup +}e{sup -} collider: {Beta}{sub e} = 0.1776 {+-} 0.0006 {+-} 0.0017, {beta}{mu} = 0.1737 {+-} 0.0008 {+-} 0.0018, and {Beta}{sub h} = 0.1152 {+-} 0.0005 {+-} 0.0012, where the first error is statistical, the second systematic, and h refers to either a charged {pi} or K. Also measured is the tau mass, m{sub {tau}} =(1778.2 {+-} 1.4) MeV. Lepton universality is affirmed by the relative branching fractions ({Beta}{sub {mu}}/{Beta}{sub e} = 0.9777 {+-} 0.0063 {+-} 0.0087, {Beta}{sub h}/{Beta}{sub e} = 0.6484 {+-} 0.0041 {+-} 0.0060) and the charged-current gauge coupling-constant ratios (g{sub {mu}} = g{sub e} = 1.0026 {+-} 0.0055, g{sub {tau}}/g{sub {mu}} = 0.9990 {+-} 0.0098). The tau mass result may be recast as a tau neutrino mass limit, m{sub {nu}{sub {tau}}} < 60 MeV at 95% CL.

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