Using a sample of (225.3 +- 2.8) x 10^6 J/psi decays collected with the BESIII detector at BEPCII, searches for invisible decays of eta and eta' in J/psi -> phi eta and phi eta' are performed. Decays of phi -> K+K- are used to tag the eta and eta' decays. No signals above background are found for the invisible decays, and upper limits at the 90% confidence level are determined to be 2.6 x 10^-4 for the ratio B(eta->invisible/eta->gamma gamma) and 2.4 x 10^-2 for B(eta'->invisible/eta'->gamma gamma). These limits may be used to constrain light dark matter particles or spin-1 U bosons.

Search for η and η^{′} invisible decays in J/ψ→ϕη and ϕη^{′}

DESTEFANIS, MARCO GIOVANNI;GRECO, Michela;MAGGIORA, MARCO;SPATARO, STEFANO GIOVANNI;
2013-01-01

Abstract

Using a sample of (225.3 +- 2.8) x 10^6 J/psi decays collected with the BESIII detector at BEPCII, searches for invisible decays of eta and eta' in J/psi -> phi eta and phi eta' are performed. Decays of phi -> K+K- are used to tag the eta and eta' decays. No signals above background are found for the invisible decays, and upper limits at the 90% confidence level are determined to be 2.6 x 10^-4 for the ratio B(eta->invisible/eta->gamma gamma) and 2.4 x 10^-2 for B(eta'->invisible/eta'->gamma gamma). These limits may be used to constrain light dark matter particles or spin-1 U bosons.
2013
87
012009-1
012009-9
M. Ablikim;M. N. Achasov;O. Albayrak;D. J. Ambrose;F. F. An;Q. An;J. Z. Bai;Y. Ban;J. Becker;J. V. Bennett;M. Bertani;J. M. Bian;E. Boger...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/130728
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