Riordan, E. M. and Krasny, M. W. and Lang, K. and de Barbaro, P. and Bodek, A. and Dasu, S. and Varelas, N. and Wang, X. and Arnold, R. and Benton, D. and Bosted, P. and Clogher, L. and Lung, A. and Rock, S. and Szalata, Z. and Filippone, B. W. and Walker, R. C. and Bjorken, J. D. and Crisler, M. and Para, A. and Lambert, J. and Button-Shafer, J. and Debebe, B. and Frodyma, M. and Hicks, R. S. and Peterson, G. A. and Gearhart, R. (1987) Search for short-lived axions in an electron-beam-dump experiment. Physical Review Letters, 59 (7). pp. 755-758. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:RIOprl87
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We report results of an electron-beam-dump search for neutral particles with masses in the range 1 to 15 MeV and lifetimes τ between 10^-14 and 10^-10 s. No evidence was found for such an object. We fule out the existence of any 1.8-MeV pseudoscalar boson with τ>8.2×10^-15 s and an absorption cross section in matter less than 1 mb per nucleon, and exclude τ>1×10^-14 s were its cross section to equal 50 mb per nucleon. In conjunction with measurements of the electron’s anomalous magnetic moment, this experiment shows that the narrow positron peaks observed in heavy-ion collisions at the Gessellschaft für Schwerionenforschung are not due to an elementary pseudoscalar.
|Additional Information:||© 1987 by The American Physical Society. Received 4 May 1987. We thank G. Davis, R. Eisele, C. Hudspeth, L. Keller, and D. Walz for their aid in the setup and running of this experiment. The support of B. Richter and the SLAC staff were crucial to its success. We also acknowledge valuable discussions with S. Brodsky, M. Karliner, L. Krauss, B. Lu, and Y.S. Tsai. This research was supported by Department of Energy Contracts No. ER13065-453, No. DE-AC02-76ER02853, and No. DE-AC03-76SF00515; and National Science Foundation Contracts No. PHY84-10549 and No. PHY85-05682.|
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|Deposited By:||Tony Diaz|
|Deposited On:||15 Apr 2008|
|Last Modified:||26 Dec 2012 09:57|
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