Search for anomalous production of photonic events with missing energy in $e^+ e^-$ collisions at $\sqrt{s}$ = 130-172 GeV

Photonic events with large missing energy have been observed in e+e- collisions at centre-of-mass energies of 130, 136, 161 and 172 GeV using the OPAL detector at LEP. Results are presented based on search topologies designed to select events with a single photon and missing transverse energy or eve...

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Detalles Bibliográficos
Autores principales: Ackerstaff, K., Alexander, G., Allison, John, Altekamp, N., Anderson, K.J., Anderson, S., Arcelli, S., Asai, S., Ashby, S.F., Axen, D., Azuelos, G., Ball, A.H., Barberio, E., Barlow, Roger J., Bartoldus, R., Batley, J.R., Baumann, S., Bechtluft, J., Beeston, C., Behnke, T., Bell, A.N., Bell, Kenneth Watson, Bella, G., Bentvelsen, S., Bethke, S., Betts, S., Biebel, O., Biguzzi, A., Bird, S.D., Blobel, V., Bloodworth, I.J., Bloomer, J.E., Bobinski, M., Bock, P., Bonacorsi, D., Boutemeur, M., Braibant, S., Brigliadori, L., Brown, Robert M., Burckhart, H.J., Burgard, C., Burgin, R., Capiluppi, P., Carnegie, R.K., Carter, A.A., Carter, J.R., Chang, C.Y., Charlton, David G., Chrisman, D., Clarke, P.E.L., Cohen, I., Conboy, J.E., Cooke, O.C., Couyoumtzelis, C., Coxe, R.L., Cuffiani, M., Dado, S., Dallapiccola, C., Dallavalle, G.Marco, Davis, R., De Jong, S., del Pozo, L.A., Desch, K., Dienes, B., Dixit, M.S., Doucet, M., Duchovni, E., Duckeck, G., Duerdoth, I.P., Eatough, D., Edwards, J.E.G., Estabrooks, P.G., Evans, H.G., Evans, M., Fabbri, F., Fanfani, A., Fanti, M., Faust, A.A., Feld, L., Fiedler, F., Fierro, M., Fischer, H.M., Fleck, I., Folman, R., Fong, D.G., Foucher, M., Furtjes, A., Futyan, D.I., Gagnon, P., Gary, J.W., Gascon, J., Gascon-Shotkin, S.M., Geddes, N.I., Geich-Gimbel, C., Geralis, T., Giacomelli, G., Giacomelli, P., Giacomelli, R., Gibson, V., Gibson, W.R., Gingrich, D.M., Glenzinski, D., Goldberg, J., Goodrick, M.J., Gorn, W., Grandi, C., Gross, E., Grunhaus, J., Gruwe, M., Hajdu, C., Hanson, G.G., Hansroul, M., Hapke, M., Hargrove, C.K., Hart, P.A., Hartmann, C., Hauschild, M., Hawkes, C.M., Hawkings, R., Hemingway, R.J., Herndon, M., Herten, G., Heuer, R.D., Hildreth, M.D., Hill, J.C., Hillier, S.J., Hobson, P.R., Hocker, James Andrew, Homer, R.J., Honma, A.K., Horvath, D., Hossain, K.R., Howard, R., Huntemeyer, P., Hutchcroft, D.E., Igo-Kemenes, P., Imrie, D.C., Ingram, M.R., Ishii, K., Jawahery, A., Jeffreys, P.W., Jeremie, H., Jimack, M., Joly, A., Jones, C.R., Jones, G., Jones, M., Jost, U., Jovanovic, P., Junk, T.R., Kanzaki, J., Karlen, D., Kartvelishvili, V., Kawagoe, K., Kawamoto, T., Kayal, P.I., Keeler, R.K., Kellogg, R.G., Kennedy, B.W., Kirk, J., Klier, A., Kluth, S., Kobayashi, T., Kobel, M., Koetke, D.S., Kokott, T.P., Kolrep, M., Komamiya, S., Kress, T., Krieger, P., von Krogh, J., Kyberd, P., Lafferty, G.D., Lahmann, R., Lai, W.P., Lanske, D., Lauber, J., Lautenschlager, S.R., Layter, J.G., Lazic, D., Lee, A.M., Lefebvre, E., Lellouch, D., Letts, J., Levinson, L., Lloyd, S.L., Loebinger, F.K., Long, G.D., Losty, M.J., Ludwig, J., Lui, D., Macchiolo, A., Macpherson, A., Mannelli, M., Marcellini, S., Markopoulos, C., Markus, C., Martin, A.J., Martin, J.P., Martinez, G., Mashimo, T., Mattig, Peter, McDonald, W.John, McKenna, J., Mckigney, E.A., McMahon, T.J., McPherson, R.A., Meijers, F., Menke, S., Merritt, F.S., Mes, H., Meyer, J., Michelini, A., Mikenberg, G., Miller, D.J., Mincer, A., Mir, R., Mohr, W., Montanari, A., Mori, T., Muller, U., Mihara, S., Nagai, K., Nakamura, I., Neal, H.A., Nellen, B., Nisius, R., O'Neale, S.W., Oakham, F.G., Odorici, F., Ogren, H.O., Oh, A., Oldershaw, N.J., Oreglia, M.J., Orito, S., Palinkas, J., Pasztor, G., Pater, J.R., Patrick, G.N., Patt, J., Perez-Ochoa, R., Petzold, S., Pfeifenschneider, P., Pilcher, J.E., Pinfold, J., Plane, David E., Poffenberger, P., Poli, B., Posthaus, A., Rembser, C., Robertson, S., Robins, S.A., Rodning, N., Roney, J.M., Rooke, A., Rossi, A.M., Routenburg, P., Rozen, Y., Runge, K., Runolfsson, O., Ruppel, U., Rust, D.R., Rylko, R., Sachs, K., Saeki, T., Sang, W.M., Sarkisian, E.K.G., Sbarra, C., Schaile, A.D., Schaile, O., Scharf, F., Scharff-Hansen, P., Schieck, J., Schleper, P., Schmitt, B., Schmitt, S., Schoning, A., Schroder, Matthias, Schultz-Coulon, H.C., Schumacher, M., Schwick, C., Scott, W.G., Shears, T.G., Shen, B.C., Shepherd-Themistocleous, C.H., Sherwood, P., Siroli, G.P., Sittler, A., Skillman, A., Skuja, A., Smith, A.M., Snow, G.A., Sobie, R., Soldner-Rembold, S., Springer, Robert Wayne, Sproston, M., Stephens, K., Steuerer, J., Stockhausen, B., Stoll, K., Strom, David M., Strohmer, R., Szymanski, P., Tafirout, R., Talbot, S.D., Tanaka, S., Taras, P., Tarem, S., Teuscher, R., Thiergen, M., Thomson, M.A., von Torne, E., Torrence, E., Towers, S., Trigger, I., Trocsanyi, Z., Tsur, E., Turcot, A.S., Turner-Watson, M.F., Utzat, P., Van Kooten, Rick J., Verzocchi, M., Vikas, P., Vokurka, E.H., Voss, H., Wackerle, F., Wagner, A., Ward, C.P., Ward, D.R., Watkins, P.M., Watson, A.T., Watson, N.K., Wells, P.S., Wermes, N., White, J.S., Wilkens, B., Wilson, G.W., Wilson, J.A., Wyatt, T.R., Yamashita, S., Yekutieli, G., Zacek, V., Zer-Zion, D.
Lenguaje:eng
Publicado: 1997
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1007/s100520050165
http://cds.cern.ch/record/338310
Descripción
Sumario:Photonic events with large missing energy have been observed in e+e- collisions at centre-of-mass energies of 130, 136, 161 and 172 GeV using the OPAL detector at LEP. Results are presented based on search topologies designed to select events with a single photon and missing transverse energy or events with a pair of acoplanar photons. In both search topologies, cross-section measurements are performed within the kinematic acceptance of the selection. These results are compared with the expectations from the Standard Model processes e+e- -> nu nu(bar) gamma (gamma) (single-photon) and e+e- -> \nu new physics contributions to these final states. Upper limits on sigma(e+e- -> XY)*Br(X -> Y gamma) and sigma(e+e- -> XX)*Br**2(X -> Y gamma) are derived for the case of stable and invisible Y. These limits apply to single and pair production of excited neutrinos (X = \nu^*, Y = \nu), to neutralino production (X = \chi^0_2, Y = \chi^0_1), and to supersymmetric models in which X = results of the acoplanar-photons search are used to provide model-dependent lower limits on the mass of the lightest neutralino.

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