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Search for a low-mass scalar Higgs boson decaying to a tau pair in single-photon decays of Y(1S)

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Search for a low-mass scalar Higgs boson decaying to a tau pair in single-photon decays of Y(1S)

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BABAR Collaboration; Martínez Vidal, Fernando; Oyanguren Campos, Arantza; Villanueva Pérez, Pablo

Aquest document és un/a article, creat/da en: 2013

Este documento está disponible también en : 10.1103/PhysRevD.88.071102

We search for a low-mass scalar CP-odd Higgs boson, A(0), produced in the radiative decay of the upsilon resonance and decaying into a tau(+)tau(-) pair: Y(1S) -> gamma A(0). The production of Y(1S) mesons is tagged by Y(2S) -> pi(+)pi(-) Y(1S) transitions, using a sample of (98.3 +/- 0.9) x 10(6) Y(2S) mesons collected by the BABAR detector. We find no evidence for a Higgs boson in the mass range 3: 5 <= m(A)0 <= 9: 2 GeV, and combine these results with our previous search for the tau decays of the light Higgs in radiative Y(3S) decays, setting limits on the coupling of A(0) to the b (b) over bar 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.

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