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Título: | Search for a Low-Mass Higgs Boson in Upsilon(3S) -> gamma A(0), A(0) -> tau(+) tau(-) at BABAR |
Autor: | Babar Collaboration; Azzolini, Virginia; López-March, Neus CSIC; Martínez-Vidal, Fernando CSIC ORCID; Milanés, Diego A. CSIC ORCID; Oyanguren, Arantza CSIC ORCID; Aubert, B. | Fecha de publicación: | 30-oct-2009 | Editor: | American Physical Society | Citación: | Physical Review Letters 103 (18): 181801 (2009) | Resumen: | We search for a light Higgs boson, $A^0$, in the radiative decay $\Upsilon(3S)\to\gamma A^0$, $A^0\to\tau^+\tau^-$, $\tau^+\to e^+\nu_e \bar{\nu}_{\tau}$ or $\tau^+\to \mu^+ \nu_{\mu} \bar{\nu}_{\tau}$. The data sample contains 122 million $\Upsilon(3S)$ events recorded with the \babar detector. We find no evidence for a narrow structure in the studied $\tau^+\tau^-$ invariant mass region of $4.03<m_{\tau^+\tau^-}<10.10$ \gevcc. We exclude at the 90% confidence level (C.L.) a low mass Higgs decaying to $\tau^+\tau^-$ with a product branching fraction ${\cal {B}}(\Upsilon(3S)\to\gamma A^0)\times {\cal {B}}(A^0\to\tau^+\tau^-)$ $>(1.5-16)\times 10^{-5}$ across the $m_{\tau^+\tau^-}$ range. We also set a 90% C.L. upper limit on the $\tau^+\tau^-$-decay of the $\eta_b$ at ${\mathcal{B}}(\eta_b\to \tau^+\tau^-)<8%$. | Versión del editor: | http://dx.doi.org/ 10.1103/PhysRevLett.103.181801 | URI: | http://hdl.handle.net/10261/21898 | DOI: | 10.1103/PhysRevLett.103.181801 | ISSN: | 0031-9007 |
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low-mass.pdf | 317,69 kB | Adobe PDF | Visualizar/Abrir |
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