Search For Gamma Gamma -> Eta(B) In E(+)E(-) Collisions At Lep 2 A Heister , S Schael , R Barate , R Bruneliere , I De Bonis , D Decamp , C Goy , S Jezequel , Jp Lees , F Martin , E Merle , Mn Minard , B Pietrzyk , B Trocme , G Boix , S Bravo , Mp Casado , M Chmeissani , Jm Crespo , E Fernandez , M Fernandez-Bosman , L Garrido , E Grauges , J Lopez , M Martinez , G Merino , R Miquel , Lm Mir , A Pacheco , D Paneque , H Ruiz , A Colaleo , D Creanza , N De Filippis , M De Palma , 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 , I Xie , R Xu , S Xue , J Zhang , L Zhang , W Zhao , D Abbaneo , P Azzurri , T Barklow , O Buchmuller , M Cattaneo , F Cerutti , B Clerbaux , H Drevermann , Rw Forty , M Frank , F Gianotti , Tc Greening , Jb Hansen , J Harvey , De Hutchcroft , P Janot , B Jost , M Kado , P Mato , A Moutoussi , F Ranjard , L Rolandi , D Schlatter , G Sguazzoni , W Tejessy , F Teubert , A Valassi , I Videau , Jj Ward , F Badaud , S Dessagne , A Falvard , D Fayolle , P Gay , J Jousset , B Michel , S Monteil , D Pallin , Jm Pascolo , P Perret , Jd Hansen , Jr Hansen , R Hansen , Bs Nilsson , A Kyriakis , C Markou , E Simopoulou , A Vayaki , K Zachariadou , A Blondel , Jc Brient , F Machefert , A Rouge , M Swynghedauw , R Tanaka , H Videau , V Ciulli , E Focardi , G Parrini , A Antonelli , M Antonelli , G Bencivenni , F Bossi , P Campana , G Capon , V Chiarella , P Laurelli , G Mannocchi , F Murtas , Gp Murtas , L Passalacqua , A Halley , J Kennedy , Jg Lynch , P Negus , V O'Shea , As Thompson , S Wasserbaech , R Cavanaugh , S Dhamotharan , C Geweniger , P Hanke , V Hepp , Ee Kluge , G Leibenguth , A Putzer , H Stenzel , K Tittel , S Werner , M Wunsch , R Beuselinck , Dm Binnie , W Cameron , G Davies , Pj Dornan , M Girone , Rd Hill , N Marinelli , J Nowell , H Przysiezniak , Sa Rutherford , Jk Sedgbeer , Jc Thompson , R White , Vm Ghete , P Girtler , E Kneringer , D Kuhn , G Rudolph , E Bouhova-Thacker , Ck Bowdery , Dp Clarke , G Ellis , Aj Finch , F Foster , G Hughes , Rwl Jones , Mr Pearson , Na Robertson , M Smizanska , O Van Der Aa , C Delaere , V Lemaitre , U Blumenschein , F Holldorfer , K Jakobs , F Kayser , K Kleinknecht , As Muller , G Quast , B Renk , Hg Sander , S Schmeling , H Wachsmuth , C Zeitnitz , T Ziegler , A Bonissent , P Coyle , C Curtil , A Ealet , D Fouchez , P Payre , A Tilquin , F Ragusa , A David , H Dietl , G Ganis , K Huttmann , G Lutjens , W Manner , Hg Moser , R Settles , G Wolf , J Boucrot , O Callot , M Davier , L Duflot , Jf Grivaz , P Heusse , A Jacholkowska , C Loomis , L Serin , Jj Veillet , Jb De Vivie De Regie , C Yuan , G Bagliesi , T Boccali , L Foa , A Giammanco , A Giassi , F Ligabue , A Messineo , F Palla , G Sanguinetti , A Sciaba , R Tenchini , A Venturi , Pg Verdini , O Awunor , Ga Blair , J Coles , G Cowan , A Garcia-Bellido , Mg Green , Lt Jones , T Medcalf , A Misiejuk , Ja Strong , P Teixeira-Dias , Rw Clifft , Tr Edgecock , Pr Norton , Ir Tomalin , B Bloch-Devaux , D Boumediene , P Colas , B Fabbro , E Lancon , Mc Lemaire , E Locci , P Perez , J Rander , Jf Renardy , A Rosowsky , P Seager , A Trabelsi , B Tuchming , B Vallage , N Konstantinidis , Am Litke , G Taylor , Cn Booth , S Cartwright , F Combley , Pn Hodgson , M Lehto , Lf Thompson , K Affholderbach , A Bohrer , S Brandt , C Grupen , J Hess , A Ngac , G Prange , U Sieler , C Borean , G Giannini , H He , J Putz , J Rothberg , Sr Armstrong , K Berkelman , K Cranmer , Dps Ferguson , Y Gao , S Gonzalez , Oj Hayes , H Hu , S Jin , J Kile , Pa Mcnamara , J Nielsen , Yb Pan , Jh Von Wimmersperg-Toeller , W Wiedenmann , J Wu , Sl Wu , X Wu , G Zobemig , G Dissertori PHYSICS LETTERS B（2002）
摘要
A search for the pseudoscalar meson eta(b) is performed in two-photon interactions at LEP 2 with an integrated luminosity of 699 pb(-1) collected at e(+)e(-) centre-of-mass energies from 181 GeV to 209 GeV. One candidate event is found in the six-charged-particle final state and none in the four-charged-particle final state, in agreement with the total expected background of about one event. Upper limits of Gamma(gammagamma)(eta(b)) x BR(eta(b) --> 4 charged particles) < 48 eV, Gamma(gammagamma) (eta(b)) x BR(eta(b) --> 6 charged particles) < 132 eV are obtained at 95% confidence level, which correspond to upper limits of 9.0% and 25% on these branching ratios. (C) 2002 Elsevier Science B.V. All rights reserved.
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