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EnglishWe search for single-photon decays of the Upsilon(1S) resonance Upsilon gamma + invisible where the invisible state is either a particle of definite mass such as a light Higgs boson A⁰ or a pair of dark matter particles chichi. Both A⁰ and chi are assumed to have zero spin. We tag Upsilon(1S) decays with a dipion transition Upsilon(2S) pi⁺pi⁻Upsilon(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 * 10⁶ Upsilon(2S) decays collected with the BABAR detector and set stringent limits on new physics models that contain light dark matter states.
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http://hdl.handle.net/11392/1548410| Titolo: | Search for production of invisible final states in single-photon decays of Upsilon(1S). |
| Autori interni: | ANDREOTTI, Mirco CALABRESE, Roberto CECCHI, Annalisa CIBINETTO, Gianluigi FIORAVANTI, Elisa FRANCHINI, Paolo GARZIA, Isabella LUPPI, Eleonora MUNERATO, Mauro NEGRINI, Matteo PETRELLA, Antonio SANTORO, Valentina |
| Data di pubblicazione: | 2011 |
| Rivista: | PHYSICAL REVIEW LETTERS |
| Abstract: | We search for single-photon decays of the Upsilon(1S) resonance Upsilon gamma + invisible where the invisible state is either a particle of definite mass such as a light Higgs boson A⁰ or a pair of dark matter particles chichi. Both A⁰ and chi are assumed to have zero spin. We tag Upsilon(1S) decays with a dipion transition Upsilon(2S) pi⁺pi⁻Upsilon(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 * 10⁶ Upsilon(2S) decays collected with the BABAR detector and set stringent limits on new physics models that contain light dark matter states. |
| Handle: | http://hdl.handle.net/11392/1548410 |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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