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.

Search for Production of Invisible Final States in Single-Photon Decays of Gamma(1S) RID C-5223-2009 / P. D., S., J. P., L., V., P., E., P., V., T., J. G., T., E., G., M., M., D. A., M., A., P., M., P., G., E., B., S., L., S., D. N., B., M. V., C., F., J., L. T., K., Y. G., K., G., L., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 107:(2011), p. 021804. [10.1103/PhysRevLett.107.021804]

Search for Production of Invisible Final States in Single-Photon Decays of Gamma(1S) RID C-5223-2009

CAVOTO, Gianluca;FACCINI, Riccardo;FERRONI, Fernando;
2011

Abstract

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.
2011
01 Pubblicazione su rivista::01a Articolo in rivista
Search for Production of Invisible Final States in Single-Photon Decays of Gamma(1S) RID C-5223-2009 / P. D., S., J. P., L., V., P., E., P., V., T., J. G., T., E., G., M., M., D. A., M., A., P., M., P., G., E., B., S., L., S., D. N., B., M. V., C., F., J., L. T., K., Y. G., K., G., L., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 107:(2011), p. 021804. [10.1103/PhysRevLett.107.021804]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/440281
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