Search for resonances decaying to η c π + π − in two-photon interactions

E Feltresi,N Gagliardi, M Margoni,M Morandin,M Posocco,M Rotondo,G Simi, F Simonetto,R Stroili, S Akar,E Benhaim, M Bomben,G R Bonneaud,H Briand, G Calderini, J Chauveau,O Hamon,Ph Leruste,G Marchiori,J Ocariz,S Sitt, M Biasini, E Manoni,S Pacetti,A M Rossi,C Angelini,G Batignani,S Bettarini,M Carpinelli,G Casarosa,A Cervelli, F Forti,M A Giorgi,A Lusiani, B Oberhof,E Paoloni,A Perez,G Rizzo, J Walsh,D Lopes Pegna, J Olsen, A J S Smith,A V Telnov, F Anulli,R Faccini,F Ferrarotto,F Ferroni, M Gaspero,L Li Gioi,M A Mazzoni,G Piredda, C Bunger,O Grunberg,T Hartmann,T Leddig,H Schroder,C Voss,R Waldi,T Adye,E O Olaiya,F F Wilson,S Emery,G Hamel De Monchenault, G Vasseur,Ch Yeche,D Aston,D J Bard, R Bartoldus,J F Benitez,C Cartaro,M R Convery, J Dorfan,G P Duboisfelsmann,W Dunwoodie,M Ebert,R C Field,M Franco Sevilla,B G Fulsom, A M Gabareen,M T Graham,P Grenier, C Hast,W R Innes,M H Kelsey, P Kim,M L Kocian, D W G S Leith,P Lewis,B Lindquist,S Luitz, V Luth,H L Lynch,D B Macfarlane,D R Muller, H Neal,Scott M Nelson,M Perl,T Pulliam,B N Ratcliff, A Roodman, A A Salnikov, R H Schindler, A Snyder,Donglin Su,M K Sullivan, J Va Vra, A Wagner,W J Wisniewski,M Wittgen,D H Wright,H W Wulsin, C C Young,V Ziegler, W Park, M V Purohit,R M White, J R Wilson, A Randleconde, S J Sekula,Mark A Bellis,P R Burchat, T S Miyashita,M S Alam,J Ernst,R Gorodeisky, N Guttman, D R Peimer, A Soffer,P Lund, S M Spanier,J L Ritchie,A M Ruland, R F Schwitters, B C Wray,J M Izen, X C Lou,F Bianchi, D Gamba,L Lanceri,L Vitale,F Martinezvidal,A Oyanguren,H Ahmed,J Albert,Sw Banerjee,F U Bernlochner, H H F Choi,G J King, R Kowalewski,M J Lewczuk, I M Nugent,J M Roney, R Sobie,N Tasneem, T Gershon,P F Harrison, T E Latham, E M T Puccio, H R Band, S Dasu, Y Pan,R Prepost,Sau Lan Wu,J P Lees,V Poireau,V Tisserand,J Garra Tico,E Grauges,A Palano,G Eigen,B Stugu,D N Brown,L T Kerth, Yu G Kolomensky,Gordon S Lynch,H Koch, T Schroeder,D J Asgeirsson,C Hearty,T S Mattison,J A Mckenna,R Y So,A Khan,V E Blinov,A R Buzykaev,V P Druzhinin,V B Golubev,E A Kravchenko,A P Onuchin,S I Serednyakov,Yu I Skovpen,E P Solodov,K Yu Todyshev,A N Yushkov, M Bondioli,D Kirkby,A J Lankford,M Mandelkern,H Atmacan,J W Gary,Fang Liu,O Long, G M Vitug,C Campagnari,T M Hong, D Kovalskyi, J D Richman,C A West,A M Eisner,J Kroseberg, W S Lockman,A J Martinez,B A Schumm,A Seiden, D S Chao, C H Cheng, B Echenard,K T Flood,D G Hitlin,P Ongmongkolkul,F C Porter,A Y Rakitin,R Andreassen,Z Huard, B T Meadows,M D Sokoloff,Licheng Sun, P C Bloom,W T Ford,A Gaz, U Nauenberg,J G Smith,S R Wagner,R Ayad,W H Toki,B Spaan, K R Schubert, R Schwierz,D Bernard,M Verderi,P J Clark,S Playfer,D Bettoni,C Bozzi,R Calabrese,G Cibinetto,E Fioravanti, I Garzia,E Luppi,M Munerato,M Negrini,L Piemontese,V Santoro,R Baldiniferroli,A Calcaterra,R De Sangro,G Finocchiaro,P Patteri,I M Peruzzi,M Piccolo,M Rama,A Zallo, R Contri,E Guido,M Lo Vetere,M R Monge, S Passaggio,C Patrignani,E Robutti,B Bhuyan,V Prasad,C L Lee,M Morii,A J Edwards,A Adametz,U Uwer, H M Lacker,T Lueck, P D Dauncey, P K Behera,U Mallik,C Chen, J Cochran, W T Meyer,S Prell,A E Rubin,A V Gritsan, Z J Guo,N Arnaud, M Davier,D Derkach,G Grosdidier,F Le Diberder,A M Lutz, B Malaescu,P Roudeau,M H Schune, A Stocchi,G Wormser, D J Lange,C A Chavez,J P Coleman,J R Fry, E Gabathuler,D E Hutchcroft,D J Payne, C Touramanis,A J Bevan,F Di Lodovico,R Sacco, M Sigamani,G Cowan, C L Davis, A G Denig,M Fritsch,W Gradl,K Griessinger,A Hafner,E Prencipe,R J Barlow,G Jackson,G D Lafferty, E Behn,R Cenci,B Hamilton, A Jawahery,D A Roberts,C Dallapiccola,R Cowan,D Dujmic, G Sciolla,R Cheaib,D Lindemann,P M Patel,S H Robertson,P Biassoni,N Neri,F Palombo,S Stracka, L Cremaldi,R Godang, R Kroeger,P Sonnek, D J Summers,X Nguyen,M Simard,P Taras,G De Nardo, D Monorchio,G Onorato,C Sciacca,M Martinelli,G Raven, C P Jessop,J M Losecco,W F Wang,K Honscheid, R Kass,J Brau,R Frey, N B Sinev,D Strom,E Torrence

Physical Review D（2012）

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摘要

We report a study of the process gamma gamma -> X -> eta_c pi+ pi-, where X stands for one of the resonances chi_{c2}(1P), eta_c(2S), X(3872), X(3915), or chi_{c2}(2P). The analysis is performed with a data sample of 473.9 fb^{-1} collected with the BaBar detector at the PEP-II asymmetric-energy electron-positron collider. We do not observe a significant signal for any channel, and calculate 90% confidence-level upper limits on the products of branching fractions and two-photon widths Gamma(X -> gamma gamma)BR(X -> eta_c pi+ pi-): 15.7 eV for chi_{c2}(1P), 133 eV for eta_c(2S), 11.1 eV for X(3872) (assuming it to be a spin-2 state), 16 eV for X(3915) (assuming it to be a spin-2 state), and 19 eV for chi_{c2}(2P). We also report upper limits on the ratios of branching fractions BR(eta_c(2S) -> eta_c pi+ pi-)/BR(eta_c(2S)-> K_S^0 K+ pi-) eta_c pi+ pi-)/BR(chi_{c2}(1P)-> K_S^0 K+ pi-) <32.9 at the 90% confidence level.

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