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Phys. Rev. Lett. 46, 1555–1559 (1981)

Observation of Prompt Like-Sign Dimuon Production in Neutrino Reactions

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K. Nishikawa* and D. Buchholz
Northwestern University, Evanston, Illinois 60201

B. C. Barish, J. F. Bartlett†, R. Blair, Y. Chu, J. Lee‡, P. Linsay§, J. Ludwig, R. Messner, P. Mine**, F. J. Sciulli, M. Shaevitz, and E. Siskind††
California Institute of Technology, Pasadena, California 91125

D. Edwards, H. Edwards, H. E. Fisk, Y. Fukushima, G. Krafczyk, and D. Nease‡‡
Fermi National Accelerator Laboratory, Batavia, Illinois 60510

A. Bodek and W. Marsh
University of Rochester, Rochester, New York 14627

O. Fackler
Rockefeller University, New York, New York 10021

See Also: Erratum

Received 24 November 1980; published in the issue dated 15 June 1981

We report on the observation of twelve like-sign (μ-μ-) neutrino-induced dimuon events with muon momenta greater than 9 GeV. The background from π and K decay is 1.3 events so that we conclude that this prompt signal is real with a significance greater than 1 in 107. Although the overall rate is higher than present theoretical estimates, the kinematic distributions of these events are qualitatively consistent with a picture of charm-anticharm production. The ratio of μ-μ-/μ- shows a strong energy dependence and rises to (2.5±1.0) × 10-3 at Eν=250 GeV.

© 1981 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.46.1555
DOI:
10.1103/PhysRevLett.46.1555
PACS:
13.15.+g

*Present address: Enrico Fermi Institute, Chicago, Ill. 60637.

†Present address: Fermilab, Batavia, Ill. 60510.

‡Present address: Sandia National Laboratory, Albuquerque, N. Mex. 87185.

§Present address: Massachusetts Institute of Technology, Cambridge, Mass. 02139.

**Permanent address: Ecole Polytechnique, F-91128 Palaiseau, France.

††Present address: Brookhaven National Laboratory, Upton, N. Y. 11973.

‡‡Present address: Westinghouse Corp., Pittsburgh, Pa. 15213.

See Also

Erratum: K. Nishikawa, D. Buchholz, B. C. Barish, J. F. Bartlett, R. Blair, Y. Chu, J. Lee, P. Linsay, J. Ludwig, R. Messner, P. Mine, F. J. Sciulli, M. Shaevitz, E. Siskind, D. Edwards, H. Edwards, H. E. Fisk, Y. Fukushima, G. Krafczyk, D. Nease, A. Bodek, W. Marsh, and O. Fackler, Erratum: Observation of prompt like-sign Dimuon production in Neutrino reactions [Phys. Rev. Lett. 46, 1555 (1981)], Phys. Rev. Lett. 54, 1336 (1985).

 
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