Observation of the bottomonium ground state in the decay Upsilon(3S)->gamma eta(b) RID C-5223-2009

Aubert, B; Bona, M; Karyotakis, Y; Lees, Jp; Poireau, V; Prencipe, E; Prudent, X; Tisserand, V; Tico, Jg; Grauges, E; Lopez, L; Palano, A; Pappagallo, M; Eigen, G; Stugu, B; Sun, L; Abrams, Gs; Battaglia, M; Brown, Dn; Cahn, Rn; Jacobsen, Rg; Kerth, Lt; Kolomensky, Yg; Lynch, G; Osipenkov, Il; Ronan, Mt; Tackmann, K; Tanabe, T; Hawkes, Cm; Soni, N; Watson, At; Koch, H; Schroeder, T; Walker, D; Asgeirsson, Dj; Fulsom, Bg; Hearty, C; Mattison, Ts; McKenna, Ja; Barrett, M; Khan, A; Blinov, Ve; Bukin, Ad; Buzykaev, Ar; Druzhinin, Vp; Golubev, Vb; Onuchin, Ap; Serednyakov, Si; Skovpen, Yi; Solodov, Ep; Todyshev, Ky; Bondioli, M; Curry, S; Eschrich, I; Kirkby, D; Lankford, Aj; Lund, P; Mandelkern, M; Martin, Ec; Stoker, Dp; Abachi, S; Buchanan, C; Gary, Jw; Liu, F; Long, O; Shen, Bc; Vitug, Gm; Yasin, Z; Zhang, L; Sharma, V; Campagnari, C; Hong, Tm; Kovalskyi, D; Mazur, Ma; Richman, Jd; Beck, Tw; Eisner, Am; Flacco, Cj; Heusch, Ca; Kroseberg, J; Lockman, Ws; Martinez, Aj; Schalk, T; Schumm, Ba; 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doi:10.1103/PhysRevLett.101.071801

We report the results of a search for the bottomonium ground state eta(b)(1S) in the photon energy spectrum with a sample of (109 +/- 1) million of Upsilon(3S) recorded at the Upsilon(3S) energy with the BABAR detector at the PEP-II B factory at SLAC. We observe a peak in the photon energy spectrum at E(gamma)=921.2(-2.8)(+2.1)(stat)+/- 2.4(syst) MeV with a significance of 10 standard deviations. We interpret the observed peak as being due to monochromatic photons from the radiative transition Upsilon(3S)->gamma eta(b)(1S). This photon energy corresponds to an eta(b)(1S) mass of 9388.9(-2.3)(+3.1)(stat)+/- 2.7(syst) MeV/c(2). The hyperfine Upsilon(1S)-eta(b)(1S) mass splitting is 71.4(-3.1)(+2.3)(stat)+/- 2.7(syst) MeV/c(2). The branching fraction for this radiative Upsilon(3S) decay is estimated to be [4.8 +/- 0.5(stat)+/- 1.2(syst)]x10(-4).

Titolo:	Observation of the bottomonium ground state in the decay Upsilon(3S)->gamma eta(b) RID C-5223-2009
Autori:	Aubert B Bona M Karyotakis Y Lees JP Poireau V Prencipe E Prudent X Tisserand V Tico JG Grauges E Lopez L Palano A Pappagallo M Eigen G Stugu B Sun L Abrams GS Battaglia M Brown DN Cahn RN Jacobsen RG Kerth LT Kolomensky YG Lynch G Osipenkov IL Ronan MT Tackmann K Tanabe T Hawkes CM Soni N Watson AT Koch H Schroeder T Walker D Asgeirsson DJ Fulsom BG Hearty C Mattison TS McKenna JA Barrett M Khan A Blinov VE Bukin AD Buzykaev AR Druzhinin VP Golubev VB Onuchin AP Serednyakov SI Skovpen YI Solodov EP Todyshev KY Bondioli M Curry S Eschrich I Kirkby D Lankford AJ Lund P Mandelkern M Martin EC Stoker DP Abachi S Buchanan C Gary JW Liu F Long O Shen BC Vitug GM Yasin Z Zhang L Sharma V Campagnari C Hong TM Kovalskyi D Mazur MA Richman JD Beck TW Eisner AM Flacco CJ Heusch CA Kroseberg J Lockman WS Martinez AJ Schalk T Schumm BA Seiden A Wilson MG Winstrom LO Cheng CH Doll DA Echenard B Fang F Hitlin DG Narsky I Piatenko T Porter FC Andreassen R Mancinelli G Meadows BT Mishra K Sokoloff MD Bloom PC Ford WT Gaz A Hirschauer JF Nagel M Nauenberg U Smith JG Ulmer KA Wagner SR Ayad R Soffer A Toki WH Wilson RJ Altenburg DD Feltresi E Hauke A Jasper H Karbach M Merkel J Petzold A Spaan B Wacker K Kobel MJ Mader WF Nogowski R Schubert KR Schwierz R Volk A Bernard D Bonneaud GR Latour E Verderi M Clark PJ Playfer S Watson JE Andreotti M Bettoni D Bozzi C Calabrese R Cecchi A Cibinetto G Franchini P Luppi E Negrini M Petrella A Piemontese L Santoro V Baldini Ferroli R Calcaterra A De Sangro R Finocchiaro G Pacetti S Patteri P Peruzzi IM Piccolo M Rama M Zallo A Buzzo A Contri R Lo Vetere M Macri MM Monge MR Passaggio S Patrignani C Robutti E Santroni A Tosi S Chaisanguanthum KS Morii M Adametz A Marks J Schenk S Uwer U Klose V Lacker HM Bard DJ Dauncey PD Nash JA Tibbetts M Behera PK Chai X Charles MJ Mallik U Cochran J Crawley HB Dong L Meyer WT Prell S Rosenberg EI Rubin AE Gao YY Gritsan AV Guo ZJ Lae CK Arnaud N Quilleux JB D'Orazio A Davier M Da Costa JF Grosdidier G Hocker A Lepeltier V Le Diberder F Lutz AM Pruvot S Roudeau P Schune MH Serrano J Sordini V Stocchi A Wormser G Lange DJ Wright DM Bingham I Burke JP Chavez CA Fry JR Gabathuler E Gamet R Hutchcroft DE Payne DJ Touramanis C Bevan AJ Clarke CK George KA Di Lodovico F Sacco R Sigamani M Cowan G Flaecher HU Hopkins DA Paramesvaran S Salvatore F Wren AC Brown DN Davis CL Denig AG Fritsch M Gradl W Schott G Alwyn KE Bailey D Barlow RJ Chia YM Edgar CL Jackson G Lafferty GD West TJ Yi JI Anderson J Chen C Jawahery A Roberts DA Simi G Tuggle JM Dallapiccola C Li X Salvati E Saremi S Cowan R Dujmic D Fisher PH Sciolla G Spitznagel M Taylor F Yamamoto RK Zhao M Patel PM Robertson SH Lazzaro A Lombardo V Palombo F Bauer JM Cremaldi L Godang R Kroeger R Sanders DA Summers DJ Zhao HW Simard M Taras P Viaud FB Nicholson H De Nardo G Lista L Monorchio D Onorato G Sciacca C Raven G Snoek HL Jessop CP Knoepfel KJ LoSecco JM Wang WF Benelli G Corwin LA Honscheid K Kagan H Kass R Morris JP Rahimi AM Regensburger JJ Sekula SJ Wong QK Blount NL Brau J Frey R Igonkina O Kolb JA Lu M Rahmat R Sinev NB Strom D Strube J Torrence E Castelli G Gagliardi N Margoni M Morandin M Posocco M Rotondo M Simonetto F Stroili R Voci C Sanchez PDA Ben Haim E Briand H Calderini G Chauveau J David P Del Buono L Hamon O Leruste P Ocariz J Perez A Prendki J Sitt S Gladney L Biasini M Covarelli R Manoni E Angelini C Batignani G Bettarini S Carpinelli M Cervelli A Forti F Giorgi MA LUSIANI, Alberto Marchiori G Neri MMN Paoloni E Rizzo G Walsh JJ Pegna DL Lu C Olsen J Smith AJS Telnov AV Anulli F Baracchini E Cavoto G Del Re D Di Marco E Faccini R Ferrarotto F Ferroni F Gaspero M Jackson PD Gioi LL Mazzoni MA Morganti S Piredda G Polci F Renga F Voena C Ebert M Hartmann T Schroder H Waldi R Adye T Franek B Olaiya EO Wilson FF Emery S Escalier M Esteve L Ganzhur SF De Monchenault GH Kozanecki W Vasseur G Yeche C Zito M Chen XR Liu H Park W Purohit MV White RM Wilson JR Allen MT Aston D Bartoldus R Bechtle P Benitez JF Bertsche K Cai Y Cenci R Coleman JP Convery MR Decker FJ Dingfelder JC Dorfan J Dubois Felsmann GP Dunwoodie W Ecklund S Erickson R Field RC Fisher A Fox J Gabareen AM Gowdy SJ Graham MT Grenier P Hast C Innes WR Iverson R Kaminski J Kelsey MH Kim H Kim P Kocian ML Kulikov A Leith DWGS Li S Lindquist B Luitz S Luth V Lynch HL MacFarlane DB Marsiske H Messner R Muller DR Neal H Nelson S Novokhatski A O'Grady CP Ofte I Perazzo A Perl M Ratcliff BN Rivetta C Roodman A Salnikov AA Schindler RH Schwiening J Seeman J Snyder A Su D Sullivan MK Suzuki K Swain SK Thompson JM Va'vra J VanWinkle D Wagner AP Weaver M West CA Wienands U Wisniewski WJ Wittgen M Wittmer W Wright DH Wulsin HW Yan Y Yarritu AK Yi K Yocky G Young CC Ziegler V Burchat PR Edwards AJ Majewski SA Miyashita TS Petersen BA Wilden L Ahmed S Alam MS Ernst JA Pan B Saeed MA Zain SB Spanier SM Wogsland BJ Eckmann R Ritchie JL Ruland AM Schilling CJ Schwitters RF Drummond BW Izen JM Lou XC Bianchi F Gamba D Pelliccioni M Bomben M Bosisio L Cartaro C Della Ricca G Lanceri L Vitale L Azzolini V Lopez March N Martinez Vidal F Milanes DA Oyanguren A Albert J Banerjee S Bhuyan B Choi HHF Hamano K Kowalewski R Lewczuk MJ Nugent IM Roney JM Sobie RJ Gershon TJ Harrison PF Ilic J Latham TE Mohanty GB Band HR Chen X Dasu S Flood KT Pan Y Pierini M Prepost R Vuosalo CO Wu SL mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2008
Rivista:	PHYSICAL REVIEW LETTERS
Digital Object Identifier (DOI):	http://dx.doi.org/10.1103/PhysRevLett.101.071801
Appare nelle tipologie:	1.1 Articolo in rivista

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