Search for the substructure of leptons in high energy QED processes at tristan

S. K. Kim, H. J. Kim, J. S. Kang, M. H. Lee, S. S. Myung, A. Bacala, R. Imlay, P. Kirk, J. Lim, R. R. McNeil, W. Metcalf, C. P. Cheng, J. Li, Y. K. Li, Z. P. Mao, Y. T. Xu, Y. C. Zhu, A. Abashian, K. Gotow, E. H. LowM. E. Mattson, F. Naito, L. Piilonen, K. L. Sterner, S. Lusin, C. Rosenfeld, A. T.M. Wang, S. Wilson, M. Frautschi, H. Kagan, R. Kass, C. G. Trahern, Winston Ko, R. L. Lander, K. Maeshima, R. L. Malchow, J. R. Smith, K. Sparks, M. C.S. Williams, K. Abe, Y. Fujii, Y. Higashi, Y. Kurihara, A. Maki, T. Nozaki, T. Omori, H. Sagawa, Y. Sakai, Y. Sugimoto, Y. Takaiwa, S. Terada, K. Tsuchiya, F. Kajino, D. Perticone, R. Poling, T. Thomas, I. H. Park, S. Schnetzer, J. Green, S. Sakamoto, F. Sannes, R. Stone, S. Trentalange, J. Vinson, Y. Ishi, K. Miyano, H. Miyata, Y. Yamashita, D. Blanis, A. Bodek, H. Budd, R. Coombes, S. Eno, C. A. Fry, H. Harada, Y. H. Ho, Y. K. Kim, T. Kumita, T. Mori, S. L. Olsen, P. Perez, A. Sill, N. M. Shaw, E. H. Thorndike, K. Ueno, H. W. Zheng, K. Eguchi, H. Itoh, H. Ichinose, S. Kobayashi, A. Murakami, K. Toyoshima, G. N. Kim, E. J. Kim, D. Son, H. Kozuka, S. Matsumoto, T. Sasaki, T. Takeda, R. Tanaka, R. Chiba, S. Igarashi, H. Yokota, T. Ishizuka, K. Ohta

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23 Scopus citations


QED processes up to O(α4) have been studied at center-of-mass energies between 50 and 57 GeV using the AMY detector at TRISTAN. A possible substructure of the electron and muon is investigated in terms of chiral invariant contact interactions and also in terms of excited lepton production. The differential cross section data for e+e-→e+e- are consistent with the standard model at a confidence level of only 3.5%. From the absence of excited lepton production, we establish new upper limits on the coupling to excited electrons of mass up to 56 GeV/c2 and on the coupling to excited muons of mass up to 52 GeV/c2.

Original languageEnglish (US)
Pages (from-to)476-484
Number of pages9
JournalPhysics Letters B
Issue number3-4
StatePublished - Jun 15 1989

Bibliographical note

Funding Information:
We thank the TRISTAN staff for the rapid com-missioninga nde xcellenot perationo f the storageri ng. In addition we acknowledgteh e strong support and enthusiastiacs sistancep rovidedb y the staffs of our home institutionsT. his work has been supportedb y the Japan Ministry of Education, Science and Culture (Monbusho), US Departmento f Energy and NationalS cienceF oundationt,h eKorean Sciencea nd EngineeringF oundationa nd Ministry of Education, and the AcademiaS inicaof the People'sR epublicof China.


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