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, χχ̄. 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 mA0≤9.2GeV and mχ≤4.5GeV 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.

Sanchez P., D., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., et al. (2011). Search for production of invisible final states in single-photon decays of S1. PHYSICAL REVIEW LETTERS, 107(2) [10.1103/PhysRevLett.107.021804].

Search for production of invisible final states in single-photon decays of S1

CARPINELLI, Massimo
Membro del Collaboration Group
;
2011

Abstract

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, χχ̄. 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 mA0≤9.2GeV and mχ≤4.5GeV 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.
Articolo in rivista - Articolo scientifico
Scientifica
BABAR detector
English
Carpinelli Massimo (BABAR Collaboration)
Sanchez P., D., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., et al. (2011). Search for production of invisible final states in single-photon decays of S1. PHYSICAL REVIEW LETTERS, 107(2) [10.1103/PhysRevLett.107.021804].
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Harrison, P; Latham, T; Puccio, E; Band, H; Dasu, S; Flood, K; Pan, Y; Prepost, R; Vuosalo, C; Wu, S
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/389280
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