TY  - JOUR
AU  - BABAR Collaboration (del Amo Sanchez, P. et al
AU  - Lopez-March, N.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
PY  - 2011
DA  - 2011//
TI  - Search for Production of Invisible Final States in Single-Photon Decays of Gamma(1S)
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 021804
EP  - 7pp
VL  - 107
IS  - 2
PB  - Amer Physical Soc
AB  - 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.
SN  - 0031-9007
UR  - http://arxiv.org/abs/arXiv:1007.4646
UR  - https://doi.org/10.1103/PhysRevLett.107.021804
DO  - 10.1103/PhysRevLett.107.021804
LA  - English
N1  - WOS:000292516600008
ID  - BABARCollaborationdelAmoSanchez_etal2011
ER  -