Search for anomalous photonic events with missing energy in e(+)e(-) collisions at root s = 130, 136 and 183 GeV

Authors
Abbiendi, G Ackerstaff, K Alexander, G Allison, J Altekamp, N Anderson, KJ Anderson, S Arcelli, S Asai, S Ashby, SF Axen, D Azuelos, G Ball, AH Barberio, E Barlow, RJ Bartoldus, R Batley, JR Baumann, S Bechtluft, J Behnke, T Bell, KW Bella, G Bellerive, A Bentvelsen, S Bethke, S Betts, S Biebel, O Biguzzi, A Bird, SD Blobel, V Bloodworth, IJ Bobinski, M Bock, P Bohme, J Bonacorsi, D Boutemeur, M Braibant, S Bright-Thomas, P Brigliadori, L Brown, RM Burckhart, HJ Burgard, C Burgin, R Capiluppi, P Carnegie, RK Carter, AA Carter, JR Chang, CY Charlton, DG Chrisman, D Ciocca, G Clarke, PEL Clay, E Cohen, I Conboy, JE Cooke, OC Couyoumtzelis, C Coxe, RL Cuffiani, M Dado, S Dallavalle, GM Davis, R De Jong, S del Pozo, LA de Roeck, A Desch, K Dienes, B Dixit, MS Dubbert, J Duchovni, E Duckeck, G Duerdoth, IP Eatough, D Estabrooks, PG Etzion, E Evans, HG Fabbri, F Fanti, M Faust, AA Fiedler, F Fierro, M Fleck, I Folman, R Furtjes, A Futyan, DI Gagnon, P Gary, JW Gascon, J Gascon-Shotkin, SM Gaycken, G Geich-Gimbel, C Giacomelli, G Giacomelli, P Gibson, V Gibson, WR Gingrich, DM Glenzinski, D Goldberg, J Gorn, W Grandi, C Gross, E Grunhaus, J Gruwe, M Hanson, GG Hansroul, M Hapke, M Harder, K Hargrove, CK Hartmann, C Hauschild, M Hawkes, CM Hawkings, R Hemingway, RJ Herndon, M Herten, G Heuer, RD Hildreth, MD Hill, JC Hillier, SJ Hobson, PR Hocker, A Homer, RJ Honma, AK Horvath, D Hossain, KR Howard, R Huntemeyer, P Igo-Kemenes, P Imrie, DC Ishii, K Jacob, FR Jawahery, A Jeremie, H Jimack, M Jones, CR Jovanovic, P Junk, TR Karlen, D Kartvelishvili, V Kawagoe, K Kawamoto, T Kayal, PI Keeler, RK Kellogg, RG Kennedy, BW Klier, A Kluth, S Kobayashi, T Kobel, M Koetke, DS Kokott, TP Kolrep, M Komamiya, S Kowalewski, RV Kress, T Krieger, P von Krogh, J Kuhl, T Kyberd, P Lafferty, GD Lanske, D Lauber, J Lautenschlager, SR Lawson, I Layter, JG Lazic, D Lee, AM Lellouch, D Letts, J Levinson, L Liebisch, R List, B Littlewood, C Lloyd, AW Lloyd, SL Loebinger, FK Long, GD Losty, MJ Ludwig, J Liu, D Macchiolo, A Macpherson, A Mader, W Mannelli, M Marcellini, S Markopoulos, C Martin, AJ Martin, JP Martinez, G Mashimo, T Mattig, P McDonald, WJ McKenna, J Mckigney, EA McMahon, TJ McPherson, RA Meijers, F Menke, S Merritt, FS Mes, H Meyer, J Michelini, A Mihara, S Mikenberg, G Miller, DJ Mir, R Mohr, W Montanari, A Mori, T Nagai, K Nakamura, I Neal, HA Nellen, B Nisius, R O'Neale, SW Oakham, FG Odorici, F Ogren, HO Oreglia, MJ Orito, S Palinkas, J Pasztor, G Pater, JR Patrick, GN Patt, J Perez-Ochoa, R Petzold, S Pfeifenschneider, P Pilcher, JE Pinfold, J Plane, DE Poffenberger, P Polok, J Przybycien, M Rembser, C Rick, H Robertson, S Robins, SA Rodning, N Roney, JM Roscoe, K Rossi, AM Rozen, Y Runge, K Runolfsson, O Rust, DR Sachs, K Saeki, T Sahr, O Sang, WM Sarkisyan, EKG Sbarra, C Schaile, AD Schaile, O Scharf, F Scharff-Hansen, P Schieck, J Schmitt, B Schmitt, S Schoning, A Schroder, M Schumacher, M Schwick, C Seuster, R Shears, TG Shen, BC Shepherd-Themistocleous, CH Sherwood, P Siroli, GP Sittler, A Skuja, A Smith, AM Snow, GA Sobie, R Soldner-Rembold, S Sproston, M Stahl, A Stephens, K Steuerer, J Stoll, K Stom, D Strohmer, R Surrow, B Talbot, SD Tanaka, S Taras, P Tarem, S Teuscher, R Thiergen, M Thomson, MA von Torne, E Torrence, E Towers, S Trigger, I Trocsanyi, Z Tsur, E Turcot, AS Turner-Watson, MF Van Kooten, R Vannerem, P Verzocchi, M Voss, H Wackerle, F Wagner, A Ward, CP WArd, DR Watkins, PM Watson, AT Watson, NK Wells, PS Wermes, N White, JS Wilson, GW Wilson, JA Wyatt, TR Yamashita, S Yekutieli, G Zacek, V Zer-Zion, D
Citation
G. Abbiendi et al., Search for anomalous photonic events with missing energy in e(+)e(-) collisions at root s = 130, 136 and 183 GeV, EUR PHY J C, 8(1), 1999, pp. 23-40
Citations number
41
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL C
ISSN journal
1434-6044 → ACNP
Volume
8
Issue
1
Year of publication
1999
Pages
23 - 40
Database
ISI
SICI code
1434-6044(199904)8:1<23:SFAPEW>2.0.ZU;2-Q
Abstract
Photonic events with large missing energy have been observed in e(+)e(-) co llisions at centre-of-mass energies of 130, 136 and 183 GeV collected in 19 97 using the OPAL detector at LEP. Results are presented for event topologi es with a single photon and missing transverse energy or with an acoplanar photon pair. Cross-section measurements are performed within the kinematic acceptance of each selection. These results are compared with the expectati ons from the Standard Model process e(+)e(-) --> v (v) over bar + photon(s) . No evidence is observed for new physics contributions to these final stat es. Using the data at root s = 183 GeV, upper limits on sigma(e(+)e(-) --> XY) BR(X --> Y gamma) and sigma(e(+)e(-) --> XX) BR2 (X --> Y gamma) are de rived 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 pr oduction (X = <(chi)over tilde>(0)(2), Y = <(chi)over tilde>(0)(1)) and to supersymmetric models in which X = <(chi)over tilde>(0)(1) and Y = (G) over bar is a light gravitino.