Observation of anomalous production of muon pairs in e+e- annihilation into four-lepton final states

Y. H. Ho, Y. Kurihara, T. Omori, P. Auchincloss, D. Blanis, A. Bodek, H. Budd, M. Dickson, S. Eno, C. A. Fry, H. Harada, B. J. Kim, Y. K. Kim, T. Kumita, T. Mori, S. L. Olsen, N. M. Shaw, A. Sill, E. H. Thorndike, K. UenoC. Velissaris, G. Watts, H. W. Zheng, K. Abe, Y. Fujii, Y. Higashi, S. K. Kim, A. Maki, T. Nozaki, H. Sagawa, Y. Sakai, Y. Sugimoto, Y. Takaiwa, S. Terada, R. Walker, R. Imlay, P. Kirk, J. Lim, R. R. McNeil, W. Metcalf, S. S. Myung, C. P. Cheng, P. Gu, J. Li, Y. K. Li, M. H. Ye, Y. C. Zhu, A. Abashian, K. Gotow, K. P. Hu, E. H. Low, M. E. Mattson, L. Piilonen, K. L. Sterner, S. Lusin, C. Rosenfeld, A. T.M. Wang, S. Wilson, M. Frautschi, H. Kagan, R. Kass, C. G. Trahern, R. E. Breedon, G. N. Kim, Winston Ko, R. L. Lander, K. Maeshima, R. L. Malchow, J. R. Smith, D. Stuart, F. Kajino, D. Perticone, R. Poling, T. Thomas, Y. Ishi, K. Miyano, H. Miyata, T. Sasaki, Y. Yamashita, A. Bacala, J. Liu, I. H. Park, F. Sannes, S. Schnetzer, R. Stone, J. Vinson, H. Ichinose, S. Kobayashi, A. Murakami, J. S. Kang, H. J. Kim, M. H. Lee, D. H. Han, E. J. Kim, D. Son, T. Kojima, S. Matsumoto, R. Tanaka, Y. Yamagishi, T. Yasuda, T. Ishizuka, K. Ohta

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We report results of a study of four-lepton final states produced in e+e- collisions at center-of-mass energies from 50 to 61.4 GeV using the AMY detector at the TRISTAN collider. For the cases where two or three charged tracks are produced at large angles relative to the beam direction, the cross sections agree with QED. However, we observe an excess of e+e-→e+e-μ+ μ- events with four tracks at wide angles and with dimuon mass less than 1.0 GeV/c2.

Original languageEnglish (US)
Pages (from-to)573-579
Number of pages7
JournalPhysics Letters B
Issue number3-4
StatePublished - Jul 26 1990


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