A measurement of the inclusive b → sγ branching ratio

6533b7d1fe1ef96bd125c34b

RESEARCH PRODUCT

A measurement of the inclusive b → sγ branching ratio

R. Barate D. Buskulic D. Decamp P. Ghez C. Goy J.-p. Lees A. Lucotte 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 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 R. Hagelberg J.b. Hansen J. Harvey P. Janot B. Jost I. Lehraus P. Mato A. Minten L. Moneta A. Pacheco J.-f. Pusztaszeri F. Ranjard L. Rolandi D. Rousseau D. Schlatter M. Schmitt O. Schneider W. Tejessy F. Teubert I.r. Tomalin 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 I. Siotis A. Vayaki A. Blondel G. Bonneaud J.-c. Brient P. Bourdon A. Rougé M. Rumpf A. Valassi M. Verderi H. Videau E. Focardi G. Parrini K. Zachariadou M. Corden C. Georgiopoulos 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 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 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 N.a. Robertson T. Sloan M.i. Williams I. Giehl A.m. Greene 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 F. Etienne O. Leroy F. Motsch P. Payre M. Talby A. Sadouki M. Thulasidas 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 A. Cordier M. Davier L. Duflot J.-f. Grivaz Ph. Heusse A. Höcker A. Jacholkowska D.w. Kim F. Le Diberder J. Lefrançois A.-m. Lutz M.-h. Schune E. Tournefier J.-j. Veillet I. Videau D. Zerwas P. Azzurri G. Bagliesi G. Batignani S. Bettarini T. Boccali C. Bozzi G. Calderini M. Carpinelli M.a. Ciocci R. Dell'orso R. Fantechi I. Ferrante L. Foà F. Forti A. Giassi M.a. Giorgi A. Gregorio F. Ligabue A. Lusiani P.s. Marrocchesi A. Messineo F. Palla G. Rizzo G. Sanguinetti A. Sciabà G. Sguazzoni R. Tenchini G. Tonelli C. Vannini A. Venturi P.g. Verdini G.a. Blair L.m. Bryant J.t. Chambers 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 S. Emery W. Kozanecki E. Lançon M.-c. Lemaire E. Locci P. Perez J. Rander J.-f. Renardy A. Roussarie J.-p. Schuller J. Schwindling A. Trabelsi B. Vallage S.n. Black J.h. Dann R.p. Johnson 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 C. Grupen P. Saraiva L. Smolik F. Stephan G. Giannini B. Gobbo G. Musolino J. Rothberg S. Wasserbaech 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

Nuclear and High Energy Physics Particle physics Photon electron positron. colliding beams electron positron. annihilation Electron–positron annihilation quark. pair production Hadron lep Standard Model quark ALEPH Experiment Nuclear physics Rapidity ALEPH experiment Physics electron positron Neutral current quark. radiative decay Branching fraction Physics High Energy Physics::Phenomenology ALEPH Experiment; lep quark. branching ratio High Energy Physics::Experiment experimental results

description

The flavour changing neutral current decay b --> s gamma has been detected in hadronic Z decays collected by ALEPH at LEP. The signal is isolated in lifetime-tagged b (b) over bar events by the presence of a hard photon associated with a system of high momentum and high rapidity hadrons. The background processes are normalised from the data themselves. The inclusive branching ratio is measured to be (3.11 +/- 0.80(stat) +/- 0.72(syst)) x 10(-4), consistent with the Standard Model expectation via penguin processes. (C) 1998 Published by Elsevier Science B.V. All rights reserved. The flavour changing neutral current decay b → sγ has been detected in hadronic Z decays collected by ALEPH at LEP. The signal is isolated in lifetime-tagged b b ̄ events by the presence of a hard photon associated with a system of high momentum and high rapidity hadrons. The background processes are normalised from the data themselves. The inclusive branching ratio is measured to be (3.11±0.80 stat ±0.72 syst )×10 −4 , consistent with the Standard Model expectation via penguin processes.

year	journal	country	edition	language
1998-01-01

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