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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, V.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.Wu, S. L.2014-12-232011Del Amo Sanchez, P., J. P. Lees, V. Poireau, E. Prencipe, V. Tisserand, J. Garra Tico, E. Grauges, et al. 2011. Search for Production of Invisible Final States in Single-Photon Decays of \(Υ(1S)\). Physical Review Letters 107, no. 2: 021804.0031-90071079-7114http://nrs.harvard.edu/urn-3:HUL.InstRepos:13579267We search for single-photon decays of the \(Υ(1S)\) resonance, \(Υ→γ+\) invisible, where the invisible state is either a particle of definite mass, such as a light Higgs boson \(A^0\), or a pair of dark matter particles, \(χ\overline{χ}\). Both \(A^0\) and χ are assumed to have zero spin. We tag \(Υ(1S)\) decays with a dipion transition \(Υ(2S)→π^{+}π^{−}Υ(1S)\) and look for events with a single energetic photon and significant missing energy. We find no evidence for such processes in the mass range \(m_{A^{0}}≤9.2 GeV\) and \(m_{χ}≤4.5 GeV\) in the sample of \(98×10^{6} Υ(2S)\) decays collected with the BABAR detector and set stringent limits on new physics models that contain light dark matter states.en-USJournal Article2014-12-2310.1103/PhysRe­vLett.107.021804