Single- and multi-photon production in e+e− collisions at a centre-of-mass energy of 183 GeV

6533b856fe1ef96bd12b1f00

RESEARCH PRODUCT

Single- and multi-photon production in e+e− collisions at a centre-of-mass energy of 183 GeV

R Barate D Buskulic D Decamp P Ghez C Goy S Jezequel J.-p Lees A Lucotte F Martin E Merle M.-n Minard J.-y Nief B Pietrzyk R Alemany G Boix M.p Casado M Chmeissani J.m Crespo M Delfino E Fernandez M Fernandez-bosman Ll Garrido E Graugès A Juste M Martinez G Merino R Miquel Ll.m Mir P Morawitz I.c Park A Pascual J.a Perlas I Riu F Sanchez A Colaleo D Creanza M De Palma G Gelao G Iaselli G Maggi M Maggi S Nuzzo A Ranieri G Raso F Ruggieri G Selvaggi L Silvestris P Tempesta A Tricomi G Zito X Huang J Lin Q Ouyang T Wang Y Xie R Xu S Xue J Zhang L Zhang W Zhao D Abbaneo U Becker P Bright-thomas D Casper M Cattaneo V Ciulli G Dissertori H Drevermann R.w Forty M Frank F Gianotti R Hagelberg J.b Hansen J Harvey P Janot B Jost I Lehraus P Maley P Mato A Minten L Moneta N Qi A Pacheco F Ranjard L Rolandi D Rousseau D Schlatter M Schmitt O Schneider W Tejessy F Teubert I.r Tomalin M Vreeswijk H Wachsmuth Z Ajaltouni F Badaud G Chazelle O Deschamps A Falvard C Ferdi P Gay C Guicheney P Henrard J Jousset B Michel S Monteil J-c Montret D Pallin P Perret F Podlyski J Proriol P Rosnet J.d Hansen J.r Hansen P.h Hansen B.s Nilsson B Rensch A Wäänänen G Daskalakis A Kyriakis C Markou E Simopoulou A Vayaki A Blondel J.-c Brient F Machefert A Rougé M Rumpf R Tanaka A Valassi H Videau E Focardi G Parrini K Zachariadou R Cavanaugh M Corden C Georgiopoulos T Huehn D.e Jaffe A Antonelli G Bencivenni G Bologna F Bossi P Campana G Capon F Cerutti V Chiarella G Felici P Laurelli G Mannocchi F Murtas G.p Murtas L Passalacqua M Pepe-altarelli M Chalmers L Curtis A.w Halley J.g Lynch P Negus V O'shea C Raine J.m Scarr K Smith P Teixeira-dias A.s Thompson E Thomson J.j Ward O Buchmüller S Dhamotharan C Geweniger G Graefe P Hanke G Hansper V Hepp E.e Kluge A Putzer J Sommer K Tittel S Werner M Wunsch R Beuselinck D.m Binnie W Cameron P.j Dornan M Girone S Goodsir E.b Martin N Marinelli A Moutoussi J Nash J.k Sedgbeer P Spagnolo M.d Williams V.m Ghete P Girtler E Kneringer D Kuhn G Rudolph A.p Betteridge C.k Bowdery P.g Buck P Colrain G Crawford A.j Finch F Foster G Hughes R.w.l Jones A.n Robertson M.i Williams I Giehl C Hoffmann K Jakobs K Kleinknecht G Quast B Renk E Rohne H.-g Sander P Van Gemmeren C Zeitnitz J.j Aubert C Benchouk A Bonissent G Bujosa J Carr P Coyle A Ealet D Fouchez O Leroy F Motsch P Payre M Talby A Sadouki M Thulasidas A Tilquin K Trabelsi M Aleppo M Antonelli F Ragusa R Berlich W Blum V Büscher H Dietl G Ganis H Kroha G Lütjens C Mannert W Männer H.-g Moser S Schael R Settles H Seywerd H Stenzel W Wiedenmann G Wolf J Boucrot O Callot S Chen M Davier L Duflot J.-f Grivaz Ph Heusse A Höcker A Jacholkowska M Kado D.w Kim F Le Diberder J Lefrançois L Serin E Tournefier J.-j Veillet I Videau D Zerwas P Azzurri G Bagliesi S Bettarini T Boccali C Bozzi G Calderini R Dell'orso R Fantechi I Ferrante A Giassi A Gregorio F Ligabue A Lusiani P.s Marrocchesi A Messineo F Palla G Rizzo G Sanguinetti A Sciabà G Sguazzoni R Tenchini C Vannini A Venturi P.g Verdini G.a Blair L.m Bryant J.t Chambers J Coles M.g Green T Medcalf P Perrodo J.a Strong J.h Von Wimmersperg-toeller D.r Botterill R.w Clifft T.r Edgecock S Haywood P.r Norton J.c Thompson A.e Wright B Bloch-devaux P Colas B Fabbro G Faı̈f E Lançon M.-c Lemaire E Locci P Perez H Przysiezniak J Rander J.-f Renardy A Rosowsky A Roussarie A. Trabelsi B Vallage S.n Black J.h Dann H.y Kim N Konstantinidis A.m Litke M.a Mcneil G Taylor C.n Booth C.a.j Brew S Cartwright F Combley M.s Kelly M Lehto J Reeve L.f Thompson K Affholderbach A Böhrer S Brandt G Cowan J Foss C Grupen L Smolik F Stephan G Giannini B Gobbo G Musolino J Putz J Rothberg S Wasserbaech R.w Williams S.r Armstrong E Charles P Elmer D.p.s Ferguson Y Gao S González T.c Greening O.j Hayes H Hu S Jin P.a Mcnamara Iii J.m Nachtman J Nielsen W Orejudos Y.b Pan Y Saadi I.j Scott J Walsh Sau Lan Wu X Wu G Zobernig

subject

Physics Nuclear and High Energy Physics Particle physics Missing energy [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena Electron–positron annihilation High Energy Physics::Phenomenology Context (language use)Supersymmetry lep 01 natural sciences ALEPH Experiment; lep Standard Model Nuclear physics ALEPH Experiment 0103 physical sciences Neutralino [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Gravitino High Energy Physics::Experiment 010306 general physics ALEPH experiment Particle Physics - Experiment

description

The production of final states involving one or more energetic photons from e(+)e(-) collisions is studied in a sample of 58.5 pb(-1) of data recorded at a centre-of-mass energy of 183 GeV by the ALEPH detector at LEP. The e(+)e(-) --> v (v) over bar gamma(gamma) and e(+)e(-) --> gamma gamma(gamma) cross sections are measured. The data are in good agreement with predictions based on the Standard Model and are used to set upper limits on the cross sections for anomalous photon production in the context of two supersymmetric models and for various extensions to QED. In particular, in the context of a super-light gravitino model a cross section upper limit of 0.38 pb is placed on the process e(+)e(-) --> (G) over tilde (G) over tilde gamma, allowing a lower limit to be set on the mass of the gravitino. Limits are also set on the mass of the lightest neutralino in Gauge Mediated Supersymmetry Breaking models. In the case of equal ee *gamma and ee gamma couplings a 95% C.L. lower limit on M-e* of 250 GeV/c(2) is obtained. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

year	journal	country	edition	language
1998-01-01

10.1016/s0370-2693(98)00468-7 http://hdl.handle.net/11368/2562984