Lees, J. P.Poireau, V.Tisserand, V.Garra Tico, J.Grauges, E.Palano, A.Eigen, G.Izen, Joseph M.Lou, XinchouBaBar Collaboration2014-07-282014-07-282013-10-102013-10-102012-10-231550-7998http://hdl.handle.net/10735.1/3833We search for a low-mass scalar CP-odd Higgs boson, A⁰, produced in the radiative decay of the upsilon resonance and decaying into a τ⁺τ⁻ pair: ϒ(1S)→γA⁰. The production of ϒ(1S) mesons is tagged by ϒ(2S) π⁺π⁻ ϒ(1S) transitions, using a sample of (98.3 ± 0.9) x 10⁶ ϒ(2S) mesons collected by the BABAR detector. We find no evidence for a Higgs boson in the mass range 3.5 ≤ m_{A⁰} ≤ 9.2 GeV, and combine these results with our previous search for the tau decays of the light Higgs in radiative ϒ(3S) decays, setting limits on the coupling of A⁰ to the bb̅ quarks in the range 0.09-1.9. Our measurements improve the constraints on the parameters of the next-to-minimal-supersymmetric Standard Model and similar theories with low-mass scalar degrees of freedom.en-US©2013 American Physical SocietyHiggs bosonsRadioactive decayMass (Physics)Photon energyTau decayTextLees, J. P., V. Poireau, V. Tisserand, J. Garra Tico, et al. 2013. "Search for a low-mass scalar Higgs boson decaying to a tau pair in single-photon decays of ϒ(1S)." Physical Review D 88(7), doi:10.1103/PhysRevD.88.071102887