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Title: | Search for the decay modes D0 → e+e−, D0 → μ+μ−, and D0 → e±μ∓ |
Author: | Garra Ticó, Jordi Graugés Pous, Eugeni BABAR Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 1-Aug-2012 |
Publisher: | American Physical Society |
Abstract: | We present searches for the rare decay modes D 0 → e + e − , D 0 → μ + μ − , and D 0 → e ± μ ∓ in continuum e + e − → c ¯ c events recorded by the BABAR detector in a data sample that corresponds to an integrated luminosity of 468 fb − 1 . These decays are highly Glashow-Iliopoulos-Maiani suppressed but may be enhanced in several extensions of the standard model. Our observed event yields are consistent with the expected backgrounds. An excess is seen in the D 0 → μ + μ − channel, although the observed yield is consistent with an upward background fluctuation at the 5% level. Using the Feldman-Cousins method, we set the following 90% confidence level intervals on the branching fractions: B ( D 0 → e + e − ) < 1.7 × 10 − 7 , B ( D 0 → μ + μ − ) within [ 0.6 , 8.1 ] × 10 − 7 , and B ( D 0 → e ± μ ∓ ) < 3.3 × 10 − 7 . |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.86.032001 |
It is part of: | Physical Review D, 2012, vol. 86, num. 3, p. 32001 |
URI: | http://hdl.handle.net/2445/131157 |
Related resource: | https://doi.org/10.1103/PhysRevD.86.032001 |
ISSN: | 1550-7998 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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