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

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 t...

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Veröffentlicht in:	Physical review letters 1991-02, Vol.66:8
Hauptverfasser:	Gomez-Cadenas, J.J., Heusch, C.A., Abrams, G., Adolphsen, C.E., Akerlof, C., Alexander, J.P., Alvarez, M., Amidei, D., Baden, A.R., Ballam, J., Barish, B.C., Barklow, T., Barnett, B.A., Bartelt, J., Blockus, D., Bonvicini, G., Boyarski, A., Boyer, J., Brabson, B., Breakstone, A., Brom, J.M., Bulos, F., Burchat, P.R., Burke, D.L., Butler, F., Calvino, F., Cence, R.J., Chapman, J., Cords, D., Coupal, D.P., DeStaebler, H.C., Dorfan, D.E., Dorfan, J.M., Drell, P.S., Feldman, G.J., Fernandez, E., Field, R.C., Ford, W.T., Fordham, C., Frey, R., Fujino, D., Gan, K.K., Gidal, G., Gladney, L., Glanzman, T., Gold, M.S., Goldhaber, G., Golding, L., Green, A., Grosse-Wiesmann, P., Haggerty, J., Hanson, G., Harr, R., Harris, F.A., Hawkes, C.M., Hayes, K., Herrup, D., Himel, T., Hoenk, M., Hollebeek, R.J., Hutchinson, D., Hylen, J., Innes, W.R., Jaffre, M., Jaros, J.A., Juricic, I., Kadyk, J.A., Karlen, D., Kent, J., Klein, S.R., Koide, A., Koska, W., Kozanecki, W., Lankford, A.J., Larsen, R.R., LeC
Format:	Artikel
Sprache:	eng
Schlagworte:	645101 - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties 645102 - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties 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 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS QUANTUM ELECTRODYNAMICS QUANTUM FIELD THEORY
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Zusammenfassung:	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.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.66.1007