Search for a Stable Six-Quark State at BABAR
Recent investigations have suggested that the six-quark combination u u d d s s could be a deeply bound state ( S ) that has eluded detection so far, and a potential dark matter candidate. We report the first search for a stable, doubly strange six-quark state in Υ → S ¯ Λ ¯ Λ decays based on a samp...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/171018 |
| Acceso en línea: | https://hdl.handle.net/2445/171018 |
| Access Level: | acceso abierto |
| Palabra clave: | Quarks Matèria fosca (Astronomia) Partícules (Matèria) Dark matter (Astronomy) Particles |
| Sumario: | Recent investigations have suggested that the six-quark combination u u d d s s could be a deeply bound state ( S ) that has eluded detection so far, and a potential dark matter candidate. We report the first search for a stable, doubly strange six-quark state in Υ → S ¯ Λ ¯ Λ decays based on a sample of 90 × 1 0 6 Υ ( 2 S ) and 110 × 1 0 6 Υ ( 3 S ) decays collected by the BABAR experiment. No signal is observed, and 90% confidence level limits on the combined Υ ( 2 S , 3 S ) → S ¯ Λ ¯ Λ branching fraction in the range ( 1.2 - 1.4 ) × 1 0 − 7 are derived for m S < 2.05 GeV . These bounds set stringent limits on the existence of such exotic particles. |
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