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. 2009 Oct 16;103(16):161801.
doi: 10.1103/PhysRevLett.103.161801. Epub 2009 Oct 15.

Evidence for the eta(b)(1S) meson in radiative Upsilon(2S) decay

B Aubert  1 , M Bona, Y Karyotakis, J P Lees, V Poireau, E Prencipe, X Prudent, V Tisserand, J Garra Tico, E Grauges, L Lopez, A Palano, M Pappagallo, G Eigen, B Stugu, L Sun, M Battaglia, D N Brown, L T Kerth, Yu G Kolomensky, G Lynch, I L Osipenkov, K Tackmann, T Tanabe, C M Hawkes, N Soni, A T Watson, H Koch, T Schroeder, D J Asgeirsson, B G Fulsom, C Hearty, T S Mattison, J A McKenna, M Barrett, A Khan, A Randle-Conde, V E Blinov, A D Bukin, A R Buzykaev, V P Druzhinin, V B Golubev, A P Onuchin, S I Serednyakov, Yu I Skovpen, E P Solodov, K Yu Todyshev, M Bondioli, S Curry, I Eschrich, D Kirkby, A J Lankford, P Lund, M Mandelkern, E C Martin, D P Stoker, S Abachi, C Buchanan, H Atmacan, J W Gary, F Liu, O Long, G M Vitug, Z Yasin, L Zhang, V Sharma, C Campagnari, T M Hong, D Kovalskyi, M A Mazur, J D Richman, T W Beck, A M Eisner, C A Heusch, J Kroseberg, W S Lockman, A J Martinez, T Schalk, B A Schumm, A Seiden, L O Winstrom, C H Cheng, D A Doll, B Echenard, F Fang, D G Hitlin, I Narsky, T Piatenko, F C Porter, R Andreassen, G Mancinelli, B T Meadows, K Mishra, M D Sokoloff, P C Bloom, W T Ford, A Gaz, J F Hirschauer, M Nagel, U Nauenberg, J G Smith, S R Wagner, R Ayad, A Soffer, W H Toki, R J Wilson, E Feltresi, A Hauke, H Jasper, M Karbach, J Merkel, A Petzold, B Spaan, K Wacker, M J Kobel, R Nogowski, K R Schubert, R Schwierz, A Volk, D Bernard, G R Bonneaud, E Latour, M Verderi, P J Clark, S Playfer, J E Watson, M Andreotti, D Bettoni, C Bozzi, R Calabrese, A Cecchi, G Cibinetto, P Franchini, E Luppi, M Negrini, A Petrella, L Piemontese, V Santoro, R Baldini-Ferroli, A Calcaterra, R de Sangro, G Finocchiaro, S Pacetti, P Patteri, I M Peruzzi, M Piccolo, M Rama, A Zallo, R Contri, M Lo Vetere, M R Monge, S Passaggio, C Patrignani, E Robutti, S Tosi, K S Chaisanguanthum, M Morii, A Adametz, J Marks, S Schenk, U Uwer, F U Bernlochner, V Klose, H M Lacker, D J Bard, P D Dauncey, M Tibbetts, P K Behera, X Chai, M J Charles, U Mallik, J Cochran, H B Crawley, L Dong, W T Meyer, S Prell, E I Rosenberg, A E Rubin, Y Y Gao, A V Gritsan, Z J Guo, N Arnaud, J Béquilleux, A D'Orazio, M Davier, J Firmino da Costa, G Grosdidier, F Le Diberder, V Lepeltier, A M Lutz, S Pruvot, P Roudeau, M H Schune, J Serrano, V Sordini, A Stocchi, G Wormser, D J Lange, D M Wright, I Bingham, J P Burke, C A Chavez, J R Fry, E Gabathuler, R Gamet, D E Hutchcroft, D J Payne, C Touramanis, A J Bevan, C K Clarke, F Di Lodovico, R Sacco, M Sigamani, G Cowan, S Paramesvaran, A C Wren, D N Brown, C L Davis, A G Denig, M Fritsch, W Gradl, K E Alwyn, D Bailey, R J Barlow, G Jackson, G D Lafferty, T J West, J I Yi, J Anderson, C Chen, A Jawahery, D A Roberts, G Simi, J M Tuggle, C Dallapiccola, E Salvati, S Saremi, R Cowan, D Dujmic, P H Fisher, S W Henderson, G Sciolla, M Spitznagel, F Taylor, R K Yamamoto, M Zhao, P M Patel, S H Robertson, A Lazzaro, V Lombardo, F Palombo, J M Bauer, L Cremaldi, R Godang, R Kroeger, D J Summers, H W Zhao, M Simard, P Taras, H Nicholson, G De Nardo, L Lista, D Monorchio, G Onorato, C Sciacca, G Raven, H L Snoek, C P Jessop, K J Knoepfel, J M Losecco, W F Wang, L A Corwin, K Honscheid, H Kagan, R Kass, J P Morris, A M Rahimi, J J Regensburger, S J Sekula, Q K Wong, N L Blount, J Brau, R Frey, O Igonkina, J A Kolb, M Lu, R Rahmat, N B Sinev, D Strom, J Strube, E Torrence, G Castelli, N Gagliardi, M Margoni, M Morandin, M Posocco, M Rotondo, F Simonetto, R Stroili, C Voci, P Del Amo Sanchez, E Ben-Haim, H Briand, J Chauveau, O Hamon, Ph Leruste, J Ocariz, A Perez, J Prendki, S Sitt, L Gladney, M Biasini, E Manoni, C Angelini, G Batignani, S Bettarini, G Calderini, M Carpinelli, A Cervelli, F Forti, M A Giorgi, A Lusiani, G Marchiori, M Morganti, N Neri, E Paoloni, G Rizzo, J J Walsh, D Lopes Pegna, C Lu, J Olsen, A J S Smith, A V Telnov, F Anulli, E Baracchini, G Cavoto, R Faccini, F Ferrarotto, F Ferroni, M Gaspero, P D Jackson, L Li Gioi, M A Mazzoni, S Morganti, G Piredda, F Renga, C Voena, M Ebert, T Hartmann, H Schröder, R Waldi, T Adye, B Franek, E O Olaiya, F F Wilson, S Emery, L Esteve, G Hamel de Monchenault, W Kozanecki, G Vasseur, Ch Yèche, M Zito, X R Chen, H Liu, W Park, M V Purohit, R M White, J R Wilson, M T Allen, D Aston, R Bartoldus, J F Benitez, R Cenci, J P Coleman, M R Convery, J C Dingfelder, J Dorfan, G P Dubois-Felsmann, W Dunwoodie, R C Field, A M Gabareen, M T Graham, P Grenier, C Hast, W R Innes, J Kaminski, M H Kelsey, H Kim, P Kim, M L Kocian, D W G S Leith, S Li, B Lindquist, S Luitz, V Luth, H L Lynch, D B Macfarlane, H Marsiske, R Messner, D R Muller, H Neal, S Nelson, C P O'Grady, I Ofte, M Perl, B N Ratcliff, A Roodman, A A Salnikov, R H Schindler, J Schwiening, A Snyder, D Su, M K Sullivan, K Suzuki, S K Swain, J M Thompson, J Va'vra, A P Wagner, M Weaver, C A West, W J Wisniewski, M Wittgen, D H Wright, H W Wulsin, A K Yarritu, K Yi, C C Young, V Ziegler, P R Burchat, A J Edwards, T S Miyashita, S Ahmed, M S Alam, J A Ernst, B Pan, M A Saeed, S B Zain, S M Spanier, B J Wogsland, R Eckmann, J L Ritchie, A M Ruland, C J Schilling, R F Schwitters, B W Drummond, J M Izen, X C Lou, F Bianchi, D Gamba, M Pelliccioni, M Bomben, L Bosisio, C Cartaro, G Della Ricca, L Lanceri, L Vitale, V Azzolini, N Lopez-March, F Martinez-Vidal, D A Milanes, A Oyanguren, J Albert, Sw Banerjee, B Bhuyan, H H F Choi, K Hamano, G J King, R Kowalewski, M J Lewczuk, I M Nugent, J M Roney, R J Sobie, T J Gershon, P F Harrison, J Ilic, T E Latham, G B Mohanty, E M T Puccio, H R Band, X Chen, S Dasu, K T Flood, Y Pan, R Prepost, C O Vuosalo, S L Wu; BABAR Collaboration
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Free article

Evidence for the eta(b)(1S) meson in radiative Upsilon(2S) decay

B Aubert et al. Phys Rev Lett. .
Free article

Abstract

We have performed a search for the eta_{b}(1S) meson in the radiative decay of the Upsilon(2S) resonance using a sample of 91.6x10(6) Upsilon(2S) events recorded with the BABAR detector at the PEP-II B factory at the SLAC National Accelerator Laboratory. We observe a peak in the photon energy spectrum at Egamma=609.3(-4.5)(+4.6)(stat)+/-1.9(syst) MeV, corresponding to an eta(b)(1S) mass of 9394.2(-4.9)(+4.8)(stat)+/-2.0(syst) MeV/c2. The branching fraction for the decay Upsilon(2S)-->gamma(eta)b(1S) is determined to be [3.9+/-1.1(stat)-0.9+1.1(syst)]x10(-4). We find the ratio of branching fractions B[Upsilon(2S)-->gamma(eta)b(1S)]/B[Upsilon(3S)-->gamma(eta)b(1S)]=0.82+/-0.24(stat)(-0.19)(+0.20)(syst).

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