Search for the Decay Modes D⁰ → e⁺e⁻, D⁰ → μ⁺μ⁻, and D⁰ → e^{±} μ^{∓}

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Search for the Decay Modes D⁰ → e⁺e⁻, D⁰ → μ⁺μ⁻, and D⁰ → e^{±} μ^{∓}

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Title: Search for the Decay Modes D⁰ → e⁺e⁻, D⁰ → μ⁺μ⁻, and D⁰ → e^{±} μ^{∓}
Author(s):
Lees, J. P.;
Poireau, V.;
Tisserand, V.;
Garra Tico, J.;
Grauges, E.;
Palano, A.;
Eigen, G.;
Izen, Joseph M.;
Lou, Xinchou;
BaBar Collaboration
Date Created: 2012-08-01
Format: Text
Item Type: Article
Keywords: Branching fractions (Nuclear physics)
Decay modes
Feldman-Cousins method
Abstract: We present searches for the rare decay modes D0→e +e -, D0→μ +μ -, and D0→e ±μ ∓ in continuum e +e -→cc̄ events recorded by the BABAR detector in a data sample that corresponds to an integrated luminosity of 468fb -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 D0→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(D0→e +e -)<1. 7×10 -7, B(D0→μ +μ -) within 0.6, 8.1]×10 -7, and B(D0→e ±μ ∓)<3.3×10 -7. © 2012 American Physical Society.
Publisher: Amer Physical Soc
ISSN: 1550-7998
Source: Physical Review D - Particles, Fields, Gravitation and Cosmology
Link to Related Resource: http://dx.doi.org/10.1103/PhysRevD.86.032001
Persistent Link: http://hdl.handle.net/10735.1/3168
Bibliographic Citation: Lees, J. P., V. Poireau, V. Tisserand, J. Garra Tico, et al. 2012. "Search for the decay modes D⁰ → e⁺e⁻, D⁰ → μ⁺μ⁻, and D⁰ → e^{±} μ^{∓}" Physical Review D - Particles, Fields, Gravitation and Cosmology 86(3), doi:10.1103/PhysRevD.86.032001
Terms of Use: © 2012 American Physical Society

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