Determination of the electronic branching ratio of the ϒ(9.46) and an upper limit for its total width

We have measured the reaction e + e − → e + e − at the ϒ Using athe excess of electron pairs over the QED expectation we obtain an electronic branching ratio of B ee = (5.1 ± 3.0) %. Combining this with publishe values of the muonic branching ratio B μμ we conclude that the ϒ is a narrow state with...

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Published inPhysics letters. B Vol. 93; no. 4; pp. 497 - 499
Main Authors Berger, Ch, Lackas, W., Raupach, F., Wagner, W., Alexander, G., Bürger, J., Criegee, L., Dehne, H.C., Devenish, R., Flügge, G., Franke, G., Gerke, Ch, Hackmack, E., Harms, P., Horlitz, G., Knies, G., Lehmann, E., Stella, B., Thompson, R.L., Timm, U., Waloschek, P., Winter, G.C., Wolff, S., Zimmermann, W., Achterberg, O., Blobel, V., Boesten, L., Daumann, H., Garfinkel, A.F., Kapitza, H., Koppitz, B., Lührsen, W., Maschuw, R., Spitzer, H., Van Staa, R., Wetjen, G., Bäcker, A., Derikum, K., Grupen, C., Meyer, H.J., Neumann, B., Zech, G., Daum, H.J., Meyer, H., Meyer, O., Rössler, M., Wacker, K.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.01.1980
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Abstract We have measured the reaction e + e − → e + e − at the ϒ Using athe excess of electron pairs over the QED expectation we obtain an electronic branching ratio of B ee = (5.1 ± 3.0) %. Combining this with publishe values of the muonic branching ratio B μμ we conclude that the ϒ is a narrow state with a total width < 180 keV at 95% C.L.
AbstractList We have measured the reaction e + e − → e + e − at the ϒ Using athe excess of electron pairs over the QED expectation we obtain an electronic branching ratio of B ee = (5.1 ± 3.0) %. Combining this with publishe values of the muonic branching ratio B μμ we conclude that the ϒ is a narrow state with a total width < 180 keV at 95% C.L.
Author Blobel, V.
Criegee, L.
Rössler, M.
Wetjen, G.
Timm, U.
Flügge, G.
Devenish, R.
Knies, G.
Neumann, B.
Wacker, K.
Thompson, R.L.
Meyer, O.
Spitzer, H.
Dehne, H.C.
Gerke, Ch
Waloschek, P.
Maschuw, R.
Zech, G.
Van Staa, R.
Bürger, J.
Bäcker, A.
Hackmack, E.
Meyer, H.J.
Lehmann, E.
Raupach, F.
Garfinkel, A.F.
Lührsen, W.
Lackas, W.
Franke, G.
Wolff, S.
Derikum, K.
Horlitz, G.
Daumann, H.
Daum, H.J.
Kapitza, H.
Achterberg, O.
Alexander, G.
Harms, P.
Koppitz, B.
Berger, Ch
Wagner, W.
Winter, G.C.
Grupen, C.
Zimmermann, W.
Meyer, H.
Boesten, L.
Stella, B.
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Cites_doi 10.1103/PhysRevLett.39.252
10.1016/0370-2693(79)91204-8
10.1103/PhysRevLett.39.1240
10.1016/0370-2693(78)90288-5
10.1016/0370-2693(78)90040-0
10.1103/PhysRevLett.34.43
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Snippet We have measured the reaction e + e − → e + e − at the ϒ Using athe excess of electron pairs over the QED expectation we obtain an electronic branching ratio...
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Title Determination of the electronic branching ratio of the ϒ(9.46) and an upper limit for its total width
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