Raggi, M. (2015) NA48/2 studies of rare decays. Il nuovo cimento C, 38 (4). pp. 1-9. ISSN 1826-9885
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Abstract
The first observation of about 2000 candidates, with a background contamination below 3%, of the rare decay K± → π±π0e+e− is reported by the NA48/2 experiment. The preliminary branching ratio in the full kinematic region is obtained to be: B(K± → π±π0e+e−) = (4.06 ± 0.17) · 10−6 by analyzing the data collected in 2003. A sample of 4.687×106 K± → π±π0 D, decay candidates with a negligible background contamination collected in 2003–04 is analyzed to search for the dark photon (A ) via the decay chain K± → π±π0, π0 → γA , A → e+e−. No signal is observed, and preliminary limits in the plane dark photon mixing parameter ε2 vs. its mass mA are reported.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 05 Jun 2020 13:34 |
| Last Modified: | 05 Jun 2020 13:34 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/19118 |
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