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Search for elastic nondiagonal lepton-pair production in e sup + e minus annihilation at radical s =29 GeV

Journal Article · · Physical Review Letters; (USA)
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We have searched for the annihilation of {ital e}{sup +}{ital e{minus}} into the exclusive channels {ital e}{sup {plus minus}}{tau}{sup {minus plus}} and {mu}{sup {plus minus}}{tau}{sup {minus plus}} at {radical}{ital s} =29 GeV, using 226 and 133 pb{sup {minus}1}, respectively, of data taken with the Mark II detector at the SLAC storage ring PEP. The resulting candidate sample is compatible with the expected background from {tau} pair production. Our analysis yields 95%-C.L. cross-section limits of {sigma}{sub {ital e}{tau}}/{sigma}{sub {mu}{mu}}{lt}1.8{times}10{sup {minus}3} and {sigma}{sub {mu}{tau}}/{sigma}{sub {mu}{mu}}{lt}6.1{times}10{sup {minus}3}, where {sigma}{sub {mu}{mu}} is the QED cross section for production of a lepton pair. This is the first high-{ital Q}{sup 2} test of lepton-flavor conservation involving {tau} leptons.

DOE Contract Number:
AC03-76SF00515; AC03-81ER40050; AM03-76SF00010; AC02-86ER40253
OSTI ID:
5593827
Journal Information:
Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 66:8; ISSN PRLTA; ISSN 0031-9007
Country of Publication:
United States
Language:
English

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Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
645102 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BASIC INTERACTIONS
CROSS SECTIONS
DATA
DATA ANALYSIS
ELECTRODYNAMICS
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
FIELD THEORIES
GEV RANGE
GEV RANGE 10-100
INFORMATION
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
LIMITING VALUES
NUMERICAL DATA
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTON-PHOTON INTERACTIONS
QUANTUM ELECTRODYNAMICS
QUANTUM FIELD THEORY