Search for production of invisible final states in single-photon decays of Upsilon(1S).

Del Amo Sanchez, P; Lees, J. P.; Poireau, V; Prencipe, E; Tisserand, V; Garra Tico, J; Grauges, E; Martinelli, M; Milanes, D. A.; Palano, A; Pappagallo, M; Eigen, G; Stugu, B; Sun, L; Brown, D. N.; Chistiakova, M. V.; Jensen, F; Kerth, L. T.; Kolomensky Yu, G; Lynch, G; Osipenkov, I. L.; Koch, H; Schroeder, T; Asgeirsson, D. J.; Hearty, C; Mattison, T. S.; Mckenna, J. A.; Khan, A; Randle Conde, A; Blinov, V. E.; Buzykaev, A. R.; Druzhinin, V. P.; Golubev, V. B.; Kravchenko, E. A.; Onuchin, A. P.; Serednyakov, S. I.; Skovpen Yu, I; Solodov, E. P.; Todyshev K., Yu; Yushkov, A. N.; Bondioli, M; Curry, S; Kirkby, D; Lankford, A. J.; Mandelkern, M; Martin, E. C.; Stoker, D. P.; Atmacan, H; Gary, J. W.; Liu, F; Long, O; Vitug, G. M.; Campagnari, C; Hong, T. M.; Kovalskyi, D; Richman, J. D.; West, C; Eisner, A. M.; Heusch, C. A.; Kroseberg, J; Lockman, W. S.; Martinez, A. J.; Schalk, T; Schumm, B. A.; Seiden, A; Winstrom, L. O.; Cheng, C. H.; Doll, D. A.; Echenard, B; Hitlin, D. G.; Ongmongkolkul, P; Porter, F. C.; Rakitin, A. Y.; Andreassen, R; Dubrovin, M. S.; Mancinelli, G; Meadows, B. T.; Sokoloff, M. D.; Bloom, P. C.; Ford, W. T.; Gaz, A; Nagel, M; Nauenberg, U; Smith, J. G.; Wagner, S. R.; Ayad, R; Toki, W. H.; Jasper, H; Karbach, T. M.; Petzold, A; Spaan, B; Kobel, M. J.; Schubert, K. R.; Schwierz, R; Bernard, D; Verderi, M; Clark, P. J.; Playfer, S; Watson, J. E.; Andreotti, Mirco; Bettoni, D; Bozzi, C; Calabrese, Roberto; Cecchi, Annalisa; Cibinetto, Gianluigi; Fioravanti, Elisa; Franchini, Paolo; Garzia, Isabella; Luppi, Eleonora; Munerato, Mauro; Negrini, Matteo; Petrella, Antonio; Piemontese, L; Baldini Ferroli, R; Calcaterra, A; de Sangro, R; Finocchiaro, G; Nicolaci, M; Pacetti, S; Patteri, P; Peruzzi, I. M.; Piccolo, M; Rama, M; Zallo, A; Contri, R; Guido, E; Lo Vetere, M; Monge, M. R.; Passaggio, S; Patrignani, C; Robutti, E; Tosi, S; Bhuyan, B; Prasad, V; Lee, C. L.; Morii, M; Adametz, A; Marks, J; Uwer, U; Bernlochner, F. U.; Ebert, M; Lacker, H. M.; Lueck, T; Volk, A; Dauncey, P. D.; Tibbetts, M; Behera, P. K.; Mallik, U; Chen, C; Cochran, J; Crawley, H. B.; Dong, L; Meyer, W. T.; Prell, S; Rosenberg, E. I.; Rubin, A. E.; Gritsan, A. V.; Guo, Z. J.; Arnaud, N; Davier, M; Derkach, D; Firmino da Costa, J; Grosdidier, G; Le Diberder, F; Lutz, A. M.; Malaescu, B; Perez, A; Roudeau, P; Schune, M. H.; Serrano, J; Sordini, V; Stocchi, A; Wang, L; Wormser, G; Lange, D. J.; Wright, D. M.; Bingham, I; Chavez, C. A.; Coleman, J. P.; Fry, J. R.; Gabathuler, E; Gamet, R; Hutchcroft, D. E.; Payne, D. J.; Touramanis, C; Bevan, A. J.; Di Lodovico, F; Sacco, R; Sigamani, M; Cowan, G; Paramesvaran, S; Wren, A. C.; Brown, D. N.; Davis, C. L.; Denig, A. G.; Fritsch, M; Gradl, W; Hafner, A; Alwyn, K. E.; Bailey, D; Barlow, R. J.; Jackson, G; Lafferty, G. D.; Anderson, J; Cenci, R; Jawahery, A; Roberts, D. A.; Simi, G; Tuggle, J. M.; Dallapiccola, C; Salvati, E; Cowan, R; Dujmic, D; Sciolla, G; Zhao, M; Lindemann, D; Patel, P. M.; Robertson, S. H.; Schram, M; Biassoni, P; Lazzaro, A; Lombardo, V; Palombo, F; Stracka, S; Cremaldi, L; Godang, R; Kroeger, R; Sonnek, P; Summers, D. J.; Nguyen, X; Simard, M; Taras, P; De Nardo, G; Monorchio, D; Onorato, G; Sciacca, C; Raven, G; Snoek, H. L.; Jessop, C. P.; Knoepfel, K. J.; Losecco, J. M.; Wang, W. F.; Corwin, L. A.; Honscheid, K; Kass, R; Morris, J. P.; Blount, N. L.; Brau, J; Frey, R; Igonkina, O; Kolb, J. A.; Rahmat, R; Sinev, N. B.; Strom, D; Strube, J; Torrence, E; Castelli, G; Feltresi, E; Gagliardi, N; Margoni, M; Morandin, M; Posocco, M; Rotondo, M; Simonetto, F; Stroili, R; Ben Haim, E; Bonneaud, G. R.; Briand, H; Calderini, G; Chauveau, J; Hamon, O; Leruste, Ph; Marchiori, G; Ocariz, J; Prendki, J; Sitt, S; Biasini, M; Manoni, E; Rossi, A; Angelini, C; Batignani, G; Bettarini, S; Carpinelli, M; Casarosa, G; Cervelli, A; Forti, F; Giorgi, M. A.; Lusiani, A; Neri, N; Paoloni, E; Rizzo, G; Walsh, J. J.; Lopes Pegna, D; Lu, C; Olsen, J; Smith, A. J. S.; Telnov, A. V.; Anulli, F; Baracchini, E; Cavoto, G; Faccini, R; Ferrarotto, F; Ferroni, F; Gaspero, M; Li Gioi, L; Mazzoni, M. A.; Piredda, G; Renga, F; Hartmann, T; Leddig, T; Schroder, H; Waldi, R; Adye, T; Franek, B; Olaiya, E. O.; Wilson, F. F.; Emery, S; Hamel de Monchenault, G; Vasseur, G; Yeche, Ch; Zito, M; Allen, M. T.; Aston, D; Bard, D. J.; Bartoldus, R; Benitez, J. F.; Cartaro, C; Convery, M. R.; Dorfan, J; Dubois Felsmann, G. P.; Dunwoodie, W; Field, R. C.; Franco Sevilla, M; Fulsom, B. G.; Gabareen, A. M.; Graham, M. T.; Grenier, P; Hast, C; Innes, W. R.; Kelsey, M. H.; Kim, H; Kim, P; Kocian, M. L.; Leith, D. W. G. S.; Li, S; Lindquist, B; Luitz, S; Luth, V; Lynch, H. L.; Macfarlane, D. B.; Marsiske, H; Muller, D. R.; Neal, H; Nelson, S; O'Grady, C. P.; Ofte, I; Perl, M; Pulliam, T; Ratcliff, B. N.; Roodman, A; Salnikov, A. A.; Santoro, Valentina; Schindler, R. H.; Schwiening, J; Snyder, A; Su, D; Sullivan, M. K.; Sun, S; Suzuki, K; Thompson, J. M.; Va'Vra, J; Wagner, A. P.; Weaver, M; Wisniewski, W. J.; Wittgen, M; Wright, D. H.; Wulsin, H. W.; Yarritu, A. K.; Young, C. C.; Ziegler, V; Chen, X. R.; Park, W; Purohit, M. V.; White, R. M.; Wilson, J. R.; Sekula, S. J.; Bellis, M; Burchat, P. R.; Edwards, A. J.; Miyashita, T. S.; Ahmed, S; Alam, M. S.; Ernst, J. A.; Pan, B; Saeed, M. A.; Zain, S. B.; Guttman, N; Soffer, A; Lund, P; Spanier, S. M.; Eckmann, R; Ritchie, J. L.; Ruland, A. M.; Schilling, C. J.; Schwitters, R. F.; Wray, B. C.; Izen, J. M.; Lou, X. C.; Bianchi, F; Gamba, D; Pelliccioni, M; Bomben, M; Lanceri, L; Vitale, L; Lopez March, N; Martinez Vidal, F; Oyanguren, A; Albert, J; Banerjee, Sw; Choi, H. H. F.; Hamano, K; King, G. J.; Kowalewski, R; Lewczuk, M. J.; Lindsay, C; Nugent, I. M.; Roney, J. M.; Sobie, R. J.; Gershon, T. J.; Harrison, P. F.; Latham, T. E.; Puccio, E. M. T.; Band, H. R.; Dasu, S; Flood, K. T.; Pan, Y; Prepost, R; Vuosalo, C. O.; S. L., Wu

doi:10.1103/PhysRevLett.107.021804

We search for single-photon decays of the Upsilon(1S) resonance Upsilon gamma + invisible where the invisible state is either a particle of definite mass such as a light Higgs boson A⁰ or a pair of dark matter particles chichi. Both A⁰ and chi are assumed to have zero spin. We tag Upsilon(1S) decays with a dipion transition Upsilon(2S) pi⁺pi⁻Upsilon(1S) and look for events with a single energetic photon and significant missing energy. We find no evidence for such processes in the mass range m(A⁰) ≤ 9.2 GeV and m(chi) ≤ 4.5 GeV in the sample of 98 * 10⁶ Upsilon(2S) decays collected with the BABAR detector and set stringent limits on new physics models that contain light dark matter states.