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

We 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 A⁰, or a pair of dark matter particles, χχ. Both A⁰ and χ are assumed to have zero spin. We tag Υ(1S) decays with a dipion transi...

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Veröffentlicht in:	Physical review letters 2011-07, Vol.107 (2), p.021804-021804, Article 021804
Hauptverfasser:	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, M
Format:	Artikel
Sprache:	eng
Schlagworte:	Experiments Física de partícules High Energy Physics - Experiment Particle physics Physics
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Zusammenfassung:	We 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 A⁰, or a pair of dark matter particles, χχ. Both A⁰ 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(A⁰) ≤ 9.2 GeV and m(χ) ≤ 4.5 GeV in the sample of 98 × 10⁶ Υ(2S) decays collected with the BABAR detector and set stringent limits on new physics models that contain light dark matter states.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.107.021804