Observation of the bottomonium ground state in the decay Upsilon(3S)-->gammaetab

B Aubert; 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; G S Abrams; M Battaglia; D N Brown; R N Cahn; R G Jacobsen; L T Kerth; Yu G Kolomensky; G Lynch; I L Osipenkov; M T Ronan; K Tackmann; T Tanabe; C M Hawkes; N Soni; A T Watson; H Koch; T Schroeder; D Walker; D J Asgeirsson; B G Fulsom; C Hearty; T S Mattison; J A McKenna; M Barrett; A Khan; 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; J W Gary; F Liu; O Long; B C Shen; 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 J Flacco; C A Heusch; J Kroseberg; W S Lockman; A J Martinez; T Schalk; B A Schumm; A Seiden; M G Wilson; 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; K A Ulmer; S R Wagner; R Ayad; A Soffer; W H Toki; R J Wilson; D D Altenburg; E Feltresi; A Hauke; H Jasper; M Karbach; J Merkel; A Petzold; B Spaan; K Wacker; M J Kobel; W F Mader; 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; A Buzzo; R Contri; M Lo Vetere; M M Macri; M R Monge; S Passaggio; C Patrignani; E Robutti; A Santroni; S Tosi; K S Chaisanguanthum; M Morii; A Adametz; J Marks; S Schenk; U Uwer; V Klose; H M Lacker; D J Bard; P D Dauncey; J A Nash; 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; C K Lae; N Arnaud; J Béquilleux; A D'Orazio; M Davier; J Firmino da Costa; G Grosdidier; A Höcker; V Lepeltier; F Le Diberder; 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; K A George; F Di Lodovico; R Sacco; M Sigamani; G Cowan; H U Flaecher; D A Hopkins; S Paramesvaran; F Salvatore; A C Wren; D N Brown; C L Davis; A G Denig; M Fritsch; W Gradl; G Schott; K E Alwyn; D Bailey; R J Barlow; Y M Chia; C L Edgar; 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; X Li; E Salvati; S Saremi; R Cowan; D Dujmic; P H Fisher; 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 A Sanders; D J Summers; H W Zhao; M Simard; P Taras; F B Viaud; 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; G Benelli; 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; G Calderini; J Chauveau; P David; L Del Buono; O Hamon; Ph Leruste; J Ocariz; A Perez; J Prendki; S Sitt; L Gladney; M Biasini; R Covarelli; E Manoni; C Angelini; G Batignani; S Bettarini; 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; D del Re; E Di Marco; R Faccini; F Ferrarotto; F Ferroni; M Gaspero; P D Jackson; L Li Gioi; M A Mazzoni; S Morganti; G Piredda; F Polci; F Renga; C Voena; M Ebert; T Hartmann; H Schröder; R Waldi; T Adye; B Franek; E O Olaiya; F F Wilson; S Emery; M Escalier; L Esteve; S F Ganzhur; 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; P Bechtle; J F Benitez; K Bertsche; Y Cai; R Cenci; J P Coleman; M R Convery; F J Decker; J C Dingfelder; J Dorfan; G P Dubois-Felsmann; W Dunwoodie; S Ecklund; R Erickson; R C Field; A Fisher; J Fox; A M Gabareen; S J Gowdy; M T Graham; P Grenier; C Hast; W R Innes; R Iverson; J Kaminski; M H Kelsey; H Kim; P Kim; M L Kocian; A Kulikov; 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; A Novokhatski; C P O'Grady; I Ofte; A Perazzo; M Perl; B N Ratcliff; C Rivetta; A Roodman; A A Salnikov; R H Schindler; J Schwiening; J Seeman; A Snyder; D Su; M K Sullivan; K Suzuki; S K Swain; J M Thompson; J Va'vra; D Van Winkle; A P Wagner; M Weaver; C A West; U Wienands; W J Wisniewski; M Wittgen; W Wittmer; D H Wright; H W Wulsin; Y Yan; A K Yarritu; K Yi; G Yocky; C C Young; V Ziegler; P R Burchat; A J Edwards; S A Majewski; T S Miyashita; B A Petersen; L Wilden; 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; 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; H R Band; X Chen; S Dasu; K T Flood; Y Pan; M Pierini; R Prepost; C O Vuosalo; S L Wu; BABAR Collaboration

doi:10.1103/PhysRevLett.101.071801

Observation of the bottomonium ground state in the decay Upsilon(3S)-->gammaetab

Phys Rev Lett. 2008 Aug 15;101(7):071801. doi: 10.1103/PhysRevLett.101.071801. Epub 2008 Aug 11.

Authors

B Aubert¹, 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, G S Abrams, M Battaglia, D N Brown, R N Cahn, R G Jacobsen, L T Kerth, Yu G Kolomensky, G Lynch, I L Osipenkov, M T Ronan, K Tackmann, T Tanabe, C M Hawkes, N Soni, A T Watson, H Koch, T Schroeder, D Walker, D J Asgeirsson, B G Fulsom, C Hearty, T S Mattison, J A McKenna, M Barrett, A Khan, 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, J W Gary, F Liu, O Long, B C Shen, 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 J Flacco, C A Heusch, J Kroseberg, W S Lockman, A J Martinez, T Schalk, B A Schumm, A Seiden, M G Wilson, 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, K A Ulmer, S R Wagner, R Ayad, A Soffer, W H Toki, R J Wilson, D D Altenburg, E Feltresi, A Hauke, H Jasper, M Karbach, J Merkel, A Petzold, B Spaan, K Wacker, M J Kobel, W F Mader, 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, A Buzzo, R Contri, M Lo Vetere, M M Macri, M R Monge, S Passaggio, C Patrignani, E Robutti, A Santroni, S Tosi, K S Chaisanguanthum, M Morii, A Adametz, J Marks, S Schenk, U Uwer, V Klose, H M Lacker, D J Bard, P D Dauncey, J A Nash, 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, C K Lae, N Arnaud, J Béquilleux, A D'Orazio, M Davier, J Firmino da Costa, G Grosdidier, A Höcker, V Lepeltier, F Le Diberder, 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, K A George, F Di Lodovico, R Sacco, M Sigamani, G Cowan, H U Flaecher, D A Hopkins, S Paramesvaran, F Salvatore, A C Wren, D N Brown, C L Davis, A G Denig, M Fritsch, W Gradl, G Schott, K E Alwyn, D Bailey, R J Barlow, Y M Chia, C L Edgar, 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, X Li, E Salvati, S Saremi, R Cowan, D Dujmic, P H Fisher, 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 A Sanders, D J Summers, H W Zhao, M Simard, P Taras, F B Viaud, 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, G Benelli, 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, G Calderini, J Chauveau, P David, L Del Buono, O Hamon, Ph Leruste, J Ocariz, A Perez, J Prendki, S Sitt, L Gladney, M Biasini, R Covarelli, E Manoni, C Angelini, G Batignani, S Bettarini, 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, D del Re, E Di Marco, R Faccini, F Ferrarotto, F Ferroni, M Gaspero, P D Jackson, L Li Gioi, M A Mazzoni, S Morganti, G Piredda, F Polci, F Renga, C Voena, M Ebert, T Hartmann, H Schröder, R Waldi, T Adye, B Franek, E O Olaiya, F F Wilson, S Emery, M Escalier, L Esteve, S F Ganzhur, 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, P Bechtle, J F Benitez, K Bertsche, Y Cai, R Cenci, J P Coleman, M R Convery, F J Decker, J C Dingfelder, J Dorfan, G P Dubois-Felsmann, W Dunwoodie, S Ecklund, R Erickson, R C Field, A Fisher, J Fox, A M Gabareen, S J Gowdy, M T Graham, P Grenier, C Hast, W R Innes, R Iverson, J Kaminski, M H Kelsey, H Kim, P Kim, M L Kocian, A Kulikov, 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, A Novokhatski, C P O'Grady, I Ofte, A Perazzo, M Perl, B N Ratcliff, C Rivetta, A Roodman, A A Salnikov, R H Schindler, J Schwiening, J Seeman, A Snyder, D Su, M K Sullivan, K Suzuki, S K Swain, J M Thompson, J Va'vra, D Van Winkle, A P Wagner, M Weaver, C A West, U Wienands, W J Wisniewski, M Wittgen, W Wittmer, D H Wright, H W Wulsin, Y Yan, A K Yarritu, K Yi, G Yocky, C C Young, V Ziegler, P R Burchat, A J Edwards, S A Majewski, T S Miyashita, B A Petersen, L Wilden, 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, 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, H R Band, X Chen, S Dasu, K T Flood, Y Pan, M Pierini, R Prepost, C O Vuosalo, S L Wu; BABAR Collaboration

Affiliation

¹ Laboratoire de Physique des Particules, IN2P3/CNRS et Université de Savoie, F-74941 Annecy-Le-Vieux, France.

PMID: 18764521
DOI: 10.1103/PhysRevLett.101.071801

Abstract

We report the results of a search for the bottomonium ground state etab(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 Egamma=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)-->gammaetab(1S). This photon energy corresponds to an etab(1S) mass of 9388.9(-2.3)+3.1(stat)+/-2.7(syst) MeV/c2. The hyperfine Upsilon(1S)-etab(1S) mass splitting is 71.4(-3.1)+2.3(stat)+/-2.7(syst) MeV/c2. The branching fraction for this radiative Upsilon(3S) decay is estimated to be [4.8+/-0.5(stat)+/-1.2(syst)]x10(-4).