A search for single photons at petra

A search for single photons, produced in e +e − collisions together with particles interacting only weakly with matter, has been performed using the CELLO detector operating at the PETRA storage ring. From the absence of any signal, an upper limit is set at 15 (90% CL) on the number of light neutrin...

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Bibliographic Details
Published in:Physics letters. B 1986-08, Vol.176 (1), p.247-254
Main Authors: Behrend, H.-J., Bürger, J., Criegee, L., Fenner, H., Field, J.H., Franke, G., Fuster, J., Holler, Y., Meyer, J., Schröder, V., Sindt, H., Timm, U., Winter, G.G., Zimmermann, W., Bussey, P.J., Buttar, C., Campbell, A.J., Dainton, J.B., Hendry, D., McCurrach, G., Scarr, J.M., Skillicorn, I.O., Smith, K.M., Blobel, V., Feindt, M., Poppe, M., Spitzer, H., Apel, W.-D., Böhrer, A., Engler, J., Flügge, G., Fries, D.C., Fues, W., Gamerdinger, K., Grosse-Wiesmann, P., Hansmeyer, J., Henkes, Th, Hopp, G., Jung, H., Knapp, J., Krüger, M., Küster, H., Mayer, P., Müller, H., Ranitzsch, K.H., Schneider, H., Wolf, J., De Boer, W., Buschhorn, G., Christiansen, W., Grindhammer, G., Gunderson, B., Kiesling, Ch, Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Sack, B., Schacht, P., Shooshtari, G., Wiedenmann, W., Cordier, A., Davier, M., Fournier, D., Gaillard, M., Grivaz, J.F., Haissinski, J., Journé, V., Le Diberder, F., Ros, E., Spadafora, A., Veillet, J.-J., Fatah, B., George, R., Goldberg, M., Hamon, O., Kapusta, F., Kovacs, F., Poggioli, L., Rivoal, M., D'Agostini, G., Ferrarotto, F., Gaspero, M., Stella, B., Aleksan, R., Cozzika, G., Ducros, Y., Lavagne, Y., Ould Saada, F., Pamela, J., Pierre, F., Zacek, J., Alexander, G., Bella, G., Gnat, Y., Grunhaus, J., Levy, A.
Format: Article
Language:English
Subjects:
High Energy Physics - Experiment
Physics
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Summary:A search for single photons, produced in e +e − collisions together with particles interacting only weakly with matter, has been performed using the CELLO detector operating at the PETRA storage ring. From the absence of any signal, an upper limit is set at 15 (90% CL) on the number of light neutrino species, and lower limits on various supersymmetric particle masses are derived. For massless photinos, mass degenerate scalar partners of the left- and right-handed electrons are excluded below 37.7 GeV/ c 2 (90% CL).
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(86)90958-5