Multi-photon events with large missing energy in e+e− collisions at s=192–209 GeV
- Abbiendi, G.
- Ainsley, C.
- Åkesson, P.F.
- Alexander, G.
- Allison, J.
- Amaral, P.
- Anagnostou, G.
- Anderson, K.J.
- Arcelli, S.
- Asai, S.
- Axen, D.
- Azuelos, G.
- Bailey, I.
- Barberio, E.
- Barillari, T.
- Barlow, R.J.
- Batley, R.J.
- Bechtle, P.
- Behnke, T.
- Bell, K.W.
- Bell, P.J.
- Bella, G.
- Bellerive, A.
- Benelli, G.
- Bethke, S.
- Biebel, O.
- Boeriu, O.
- Bock, P.
- Boutemeur, M.
- Braibant, S.
- Brigliadori, L.
- Brown, R.M.
- Buesser, K.
- Burckhart, H.J.
- Campana, S.
- Carnegie, R.K.
- Carter, A.A.
- Carter, J.R.
- Chang, C.Y.
- Charlton, D.G.
- Ciocca, C.
- Csilling, A.
- Cuffiani, M.
- Dado, S.
- De Roeck, A.
- De Wolf, E.A.
- Desch, K.
- Dienes, B.
- Donkers, M.
- Dubbert, J.
- Duchovni, E.
- Duckeck, G.
- Duerdoth, I.P.
- Etzion, E.
- Fabbri, F.
- Feld, L.
- Ferrari, P.
- Fiedler, F.
- Fleck, I.
- Ford, M.
- Frey, A.
- Gagnon, P.
- Gary, J.W.
- Gaycken, G.
- Geich-Gimbel, C.
- Giacomelli, G.
- Giacomelli, P.
- Giunta, M.
- Goldberg, J.
- Gross, E.
- Grunhaus, J.
- Gruwé, M.
- Günther, P.O.
- Gupta, A.
- Hajdu, C.
- Hamann, M.
- Hanson, G.G.
- Harel, A.
- Hauschild, M.
- Hawkes, C.M.
- Hawkings, R.
- Hemingway, R.J.
- Herten, G.
- Heuer, R.D.
- Hill, J.C.
- Hoffman, K.
- Horváth, D.
- Igo-Kemenes, P.
- Ishii, K.
- Jeremie, H.
- Jovanovic, P.
- Junk, T.R.
- Kanaya, N.
- Kanzaki, J.
- Karlen, D.
- Kawagoe, K.
- Kawamoto, T.
- Keeler, R.K.
- Kellogg, R.G.
- Kennedy, B.W.
- Kluth, S.
- Kobayashi, T.
- Kobel, M.
- Komamiya, S.
- Krämer, T.
- Krieger, P.
- von Krogh, J.
- Kruger, K.
- Kuhl, T.
- Kupper, M.
- Lafferty, G.D.
- Landsman, H.
- Lanske, D.
- Layter, J.G.
- Lellouch, D.
- Letts, J.
- Levinson, L.
- Lillich, J.
- Lloyd, S.L.
- Loebinger, F.K.
- Lu, J.
- Ludwig, A.
- Ludwig, J.
- Mader, W.
- Marcellini, S.
- Martin, A.J.
- Masetti, G.
- Mashimo, T.
- Mättig, P.
- McKenna, J.
- McPherson, R.A.
- Meijers, F.
- Menges, W.
- Merritt, F.S.
- Mes, H.
- Meyer, N.
- Michelini, A.
- Mihara, S.
- Mikenberg, G.
- Miller, D.J.
- Moed, S.
- Mohr, W.
- Mori, T.
- Mutter, A.
- Nagai, K.
- Nakamura, I.
- Nanjo, H.
- Neal, H.A.
- Nisius, R.
- O'Neale, S.W.
- Oh, A.
- Oreglia, M.J.
- Orito, S.
- Pahl, C.
- Pásztor, G.
- Pater, J.R.
- Pilcher, J.E.
- Pinfold, J.
- Plane, D.E.
- Poli, B.
- Pooth, O.
- Przybycień, M.
- Quadt, A.
- Rabbertz, K.
- Rembser, C.
- Renkel, P.
- Roney, J.M.
- Rozen, Y.
- Runge, K.
- Sachs, K.
- Saeki, T.
- Sarkisyan, E.K.G.
- Schaile, A.D.
- Schaile, O.
- Scharff-Hansen, P.
- Schieck, J.
- Schörner-Sadenius, T.
- Schröder, M.
- Schumacher, M.
- Scott, W.G.
- Seuster, R.
- Shears, T.G.
- Shen, B.C.
- Sherwood, P.
- Skuja, A.
- Smith, A.M.
- Sobie, R.
- Söldner-Rembold, S.
- Spano, F.
- Stahl, A.
- Strom, D.
- Ströhmer, R.
- Tarem, S.
- Tasevsky, M.
- Teuscher, R.
- Thomson, M.A.
- Torrence, E.
- Toya, D.
- Tran, P.
- Trigger, I.
- Trócsányi, Z.
- Tsur, E.
- Turner-Watson, M.F.
- Ueda, I.
- Ujvári, B.
- Vollmer, C.F.
- Vannerem, P.
- Vértesi, R.
- Verzocchi, M.
- Voss, H.
- Vossebeld, J.
- Ward, C.P.
- Ward, D.R.
- Watkins, P.M.
- Watson, A.T.
- Watson, N.K.
- Wells, P.S.
- Wengler, T.
- Wermes, N.
- Wilson, G.W.
- Wilson, J.A.
- Wolf, G.
- Wyatt, T.R.
- Yamashita, S.
- Zer-Zion, D.
- Zivkovic, L.
DOIAbstract
AbstractEvents with a final state consisting of two or more photons and large missing transverse energy have been observed in e+e− collisions at centre-of-mass energies in the range 192–209 GeV using the OPAL detector at LEP. Cross-section measurements are performed within the kinematic acceptance of the selection and compared with the expectations from the Standard Model process e+e−→νν¯γγ(γ). No evidence for new physics contributions to this final state is observed. Upper limits on σ(e+e−→XX)⋅BR2(X→Yγ) are derived for the case of stable and invisible Y. In the case of massive Y the combined limits obtained from all the data range from 10 to 60 fb, while for the special case of massless Y the range is 20 to 40 fb. The limits apply to pair ...
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