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Physics Letters B
Volume 346, Issues 1-2, 2 March 1995, Pages 190-198
 
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doi:10.1016/0370-2693(95)00023-E    How to Cite or Link Using DOI (Opens New Window)
Copyright © 1995 Published by Elsevier B.V.

Measurement of energetic single-photon production at LEP

M. Acciarriaa, A. Adamar, O. Adrianiq, M. Aguilar-Benitezz, S. Ahlenk, J. Alcarazz, A. Aloisioac, G. Alversonl, M. G. Alviggiac, G. Ambrosiah, Q. Ans, H. Anderhubau, A. L. Andersonp, V. P. Andreeval, T. Angelescum, L. Antonovao, D. Antreasyani, G. Alkhazoval, P. Arcez, A. Arefievab, T. Azemoond, T. Azizj, P. V. K. S. Babas, P. Bagnaiar, ak, J. A. Bakkenaj, L. Baksayaq, R. C. Balld, S. Banerjeej, K. Baniczar, R. Barillèrer, L. Baroneak, A. Baschirottoaa, M. Basilei, R. Battistonah, A. Bayw, F. Becattiniq, U. Beckerp, F. Behnerau, Gy. L. Benczen, J. Berdugoz, P. Bergesp, B. Bertuccir, B. L. Betevau, ao, M. Biasiniah, A. Bilandau, G. M. Bileiah, R. Bizzarriak, J. J. Blaisinge, G. J. Bobbinkc, r, R. Bockaj, A. Böhmaj, B. Borgiaak, A. Bouchame, D. Bourilkovau, M. Bourquint, D. Boutignyr, B. Bouwensc, E. Brambillap, J. G. Bransonam, V. Brigljevicau, I. C. Brockai, M. Brooksx, A. Bujakar, J. D. Burgerp, W. J. Burgert, C. Burgosz, J. Busenitzaq, A. Buytenhuijsae, A. Bykoval, X. D. Cais, M. 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Physikalisches Institut, RWTH, D-52056, Aachen, FRG1 b Physikalisches Institut, RWTH, D-52056, Aachen, FRG, 1 c National Institute for High Energy Physics, NIKHEF, NL-1009 DB, Amsterdam, The Netherlands d University of Michigan, Ann Arbor, MI 48109, USA e Laboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP,IN2P3-CNRS, BP 110, F-74941, Annecy-le-Vieux CEDEX, France f Johns Hopkins University, Baltimore, MD 21218, USA g Institute of High Energy Physics, IHEP, 100039, Beijing, China h Humboldt University, D-10099, Berlin, FRG, 1 i INFN-Sezione di Bologna, I-40126, Bologna, Italy j Tata Institute of Fundamental Research, Bombay 400 005, India k Boston University, Boston, MA 02215, USA l Northeastern University, Boston, MA 02115, USA m Institute of Atomic Physics and University of Bucharest, R-76900, Bucharest, Romania Central Research Institute for Physics of the Hungarian Academy of Sciences, H-1525, Budapest 114, Hungary, 2 o Harvard University, Cambridge, MA 02139, USA p Massachusetts Institute of Technology, Cambridge, MA 02139, USA q INFN Sezione di Firenze and University of Florence, I-50125, Florence, Italy r European Laboratory for Particle Physics, CERN, CH-1211, Geneva 23, Switzerland s World Laboratory, FBLJA Project, CH-1211, Geneva 23, Switzerland t University of Geneva, CH-1211, Geneva 4, Switzerland u Chinese University of Science and Technology, USTC, Hefei, Anhui 230 029, China v SEFT, Research Institute for High Energy Physics, P.O. Box 9, SF-00014, Helsinki, Finland w University of Lausanne, CH-1015, Lausanne, Switzerland x Los Alamos National Laboratory, Los Alamos, NM 87544, USA y Institut de Physique Nucléaire de Lyon, IN2P3-CNRS, Université Claude Bernard, F-69622, Villeurbanne Cedex, France z Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, CIEMAT, E-28040, Madrid, Spain aa INFN-Sezione di Milano, I-20133, Milan, Italy ab Institute of Theoretical and Experimental Physics, ITEP, Moscow, Russia ac INFN-Sezione di Napoli and University of Naples, I-80125, Naples, Italy ad Department of Natural Sciences, University of Cyprus, Nicosia, Cyprus ae University of Nymegen and NIKHEF, NL-6525 ED, Nymegen, The Netherlands af Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA ag California Institute of Technology, Pasadena, CA 91125, USA ah INFN-Sezione di Perugia and Universitá Degli Studi di Perugia, I-06100, Perugia, Italy ai Carnegie Mellon University, Pittsburgh, PA 15213, USA aj Princeton University, Princeton, NJ 08544, USA ak INFN-Sezione di Roma and University of Rome, “La Sapienza”, I-00185, Rome, Italy al Nuclear Physics Institute, St. Petersburg, Russia am University of California, San Diego, CA 92093, USA an Dept. de Fisica de Particulas Elementales, Univ. de Santiago, E-15706, Santiago de Compostela, Spain ao Bulgarian Academy of Sciences, Institute of Mechatronics, BU-1113, Sofia, Bulgaria ap Center for High Energy Physics, Korea Advanced Inst. of Sciences and Technology, 305–701, Taejon, South Korea aq University of Alabama, Tuscaloosa, AL 35486, USA ar Purdue University, West Lafayette, IN 47907, USA as Paul Scherrer Institut, PSI, CH-5232, Villigen, Switzerland at DESY-Institut für Hochenergiephysik, D-15738, Zeuthen, FRG au Eidgenössische Technische Hochschule, ETH Zürich, CH-8093, Zürich, Switzerland av University of Hamburg, 22761, Hamburg, FRG aw High Energy Physics Group, Taiwan, ROC

Received 16 December 1994. 
Editor: K. Winter. 
Available online 17 October 2000.

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Abstract

We describe the sample of energetic single-photon events (Eγ > 15 GeV) collected by L3 in the 1991–1993 LEP runs. The event distributions agree with expectations from the Standard Model. The data are used to constrain the ZZγ coupling and to set an upper limit of 4.1 × 10−6, μB (90% C.L.) on the the magnetic moment of the τ neutrino.

Article Outline

• References

Physics Letters B
Volume 346, Issues 1-2, 2 March 1995, Pages 190-198
 
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