Phys. Rev. D
65,
112002
(2002)
[31 pages]
Search for the lepton-family-number nonconserving decay μ+→e+γ
M. Ahmed et al. (MEGA Collaboration)
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M. Ahmed3,*, J. F. Amann5, D. Barlow8,†, K. Black5,‡, R. D. Bolton5, M. L. Brooks5, S. Carius5,§, Y. K. Chen3,**, A. Chernyshev5, H. M. Concannon9, M. D. Cooper5, P. S. Cooper2, J. Crocker1,††, J. R. Dittmann9,‡‡, M. Dzemidzic3,a, A. Empl3, R. J. Fisk9, E. Fleet11,b, W. Foreman5, C. A. Gagliardi7, D. Haim11,c, A. Hallin5,d, C. M. Hoffman5, G. E. Hogan5, E. B. Hughes6,e, E. V. Hungerford, III3, C. C. H. Jui6,f, G. J. Kim7, J. E. Knott4, D. D. Koetke9, T. Kozlowski5, M. A. Kroupa5,g, A. R. Kunselman12, K. A. Lan3, V. Laptev5, D. Lee5, F. Liu7,h, R. W. Manweiler9, R. Marshall10, B. W. Mayes, II3, R. E. Mischke5, B. M. K. Nefkens8, L. M. Nickerson9,i, P. M. Nord9, M. A. Oothoudt5, J. N. Otis6,j, R. Phelps3,k, L. E. Piilonen11, C. Pillai5,8, L. Pinsky3, M. W. Ritter6,l, C. Smith11,m, T. D. S. Stanislaus5,9, K. M. Stantz4,n, J. J. Szymanski5, L. Tang3,o, W. B. Tippens10,8,p, R. E. Tribble7, X. L. Tu7,q, L. A. Van Ausdeln7,r, W. H. von Witch3,s, D. Whitehouse5,t, C. Wilkinson5, B. Wright10, S. C. Wright1, Y. Zhang11,u, and K. O. H. Ziock10,v (MEGA Collaboration)
1University of Chicago, Chicago, Illinois 60637
2Fermi National Accelerator Laboratory, Batavia, Illinois 60510
3University of Houston, Houston, Texas 77204
4Indiana University, Bloomington, Indiana 46383
5Los Alamos National Laboratory, Los Alamos, New Mexico 87545
6Stanford University, Stanford, California 94305
7Texas A & M University, College Station, Texas 77843
8University of California Los Angeles, Los Angeles, California 90095
9Valparaiso University, Valparaiso, Indiana 46383
10University of Virginia, Charlottesville, Virginia 22901
11Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
12University of Wyoming, Laramie, Wyoming 82071
Received 6 November 2001; published 7 June 2002
The MEGA experiment, which searched for the muon- and electron-number violating decay μ+→e+γ, is described. The spectrometer system, the calibrations, the data taking procedures, the data analysis, and the sensitivity of the experiment are discussed. The most stringent upper limit on the branching ratio, B(μ+→e+γ)<1.2×10-11 with 90% confidence, is derived from a likelihood analysis.
© 2002 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.65.112002
DOI:
10.1103/PhysRevD.65.112002
PACS:
13.35.Bv, 11.30.Fs, 11.30.Hv, 13.10.+q
*Permanent address: Duke University, Durham, NC 27708. †Permanent address: Washington State University, Pullman, WA 99164. ‡Permanent address: Goddard Space Flight Center, Greenbelt, MD 20740. §Permanent address: Uppsala University, 751 05 Uppsala, Sweden. **Permanent address: Zhejiang Silk and Textile University, Hangzhou, China 310012. ††Permanent address: Caltech/Applied Physics, Pasadena, CA 91125. ‡‡Permanent address: Fermilab, Batavia, IL 60510. aPermanent address: Indiana University School of Medicine, Indianapolis, IN 46202. bPermanent address: University of Maryland, College Park, MD 21201. cPermanent address: InSystems Technologies, Roanoke VA 240110. dPermanent address: Queens University, Kingston, Ontario, Canada K7L 3N6. eDeceased. fPermanent address: University of Utah, Salt Lake City, UT 84112. gPermanent address: Monmouth College, Monmouth, IL 61462. hPermanent address: Vina Technologies, Newark, CA 94560. iPermanent address: Illinois Mathematics and Science Academy, Aurora, IL 60506. jPermanent address: IBM Corp., Austin, TX 78758. kPermanent address: IBM Microelectronics Division, Essex Junction, VT 05452. lPermanent address: Salinas, CA 93901. mPermanent address: Johns Hopkins University, Baltimore, MD 21218. nPermanent address: Optosonics, Inc., Indianapolis, IN 46260. oPermanent address: Hampton University, Hampton, VA 23668. pPermanent address: US Department of Energy, Germantown, MD 20874. qPermanent address: Cisco Systems, Inc., Richardson, TX 75082. rPermanent address: Idaho National Engineering and Environmental Laboratory, Idaho Falls, ID 83401. sPermanent address: University of Bonn, Bonn, West Germany. tPermanent address: Allied Group, Glastonbury, CT 06033. uPermanent address: AT&T Labs, Middletown, NJ 07932. vPermanent address: Albuquerque, NM 87123.
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