%0 Journal Article
%T Search for Production of Invisible Final States in Single-Photon Decays of Gamma(1S)
%A BABAR Collaboration (del Amo Sanchez, P. et al
%A Lopez-March, N.
%A Martinez-Vidal, F.
%A Oyanguren, A.
%J Physical Review Letters
%D 2011
%V 107
%N 2
%I Amer Physical Soc
%@ 0031-9007
%G English
%F BABARCollaborationdelAmoSanchez_etal2011
%O WOS:000292516600008
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=691), last updated on Tue, 09 Aug 2011 10:13:23 +0000
%X We search for single-photon decays of the Gamma(1S) resonance, Gamma -> gamma + 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, chi(chi) over bar. Both A(0) and chi are assumed to have zero spin. We tag Gamma(1S) decays with a dipion transition Gamma(1S) -> pi(+)pi(-)Y(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 x 10(6) Gamma(2S) decays collected with the BABAR detector and set stringent limits on new physics models that contain light dark matter states.
%R 10.1103/PhysRevLett.107.021804
%U http://arxiv.org/abs/arXiv:1007.4646
%U https://doi.org/10.1103/PhysRevLett.107.021804
%P 021804-7pp