We present searches for the rare decay modes D0→e+e−, D0→μ+μ−, and D0→e±μ∓ in continuum e+e−→cc⎯⎯ 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 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

Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Search for the decay modes D-0 -> e(+) e(-), D-0 -> mu(+) mu(-), and D-0 -> e(+/-) mu -/+. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(3), 1-10 [10.1103/PhysRevD.86.032001].

Search for the decay modes D-0 -> e(+) e(-), D-0 -> mu(+) mu(-), and D-0 -> e(+/-) mu -/+

PATRIGNANI, CLAUDIA;
2012

Abstract

We present searches for the rare decay modes D0→e+e−, D0→μ+μ−, and D0→e±μ∓ in continuum e+e−→cc⎯⎯ 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 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
Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Search for the decay modes D-0 -> e(+) e(-), D-0 -> mu(+) mu(-), and D-0 -> e(+/-) mu -/+. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(3), 1-10 [10.1103/PhysRevD.86.032001].
Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu G.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/537505
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