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.File in questo prodotto:
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PRD87.012009.arxiv.pdf
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