A search for D0 meson decays to the π+ π− e+ e− and K+ K− e+ e− final states is reported using a sample of proton-proton collisions collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb^−1. The decay D0 → π+ π− e+ e− is observed for the first time when requiring that the two electrons are consistent with coming from the decay of a ϕ or ρ0/ω meson. The corresponding branching fractions are measured relative to the D0 → K− π+ [e+ e−]ρ0/ω decay, where the two electrons are consistent with coming from the decay of a ρ0 or ω meson. No evidence is found for the D0 → K+ K− e+ e− decay and world-best limits are set on its branching fraction. The results are compared to, and found to be consistent with, the branching fractions of the D0 → π+ π− μ+ μ− and D0 → K+ K− μ+ μ− decays recently measured by LHCb and confirm lepton universality at the current precision.

Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. a., et al. (2025). Search for D0 meson decays to π+ π− e+ e− and K+ K− e+ e− final states. PHYSICAL REVIEW D, 111(9), 1-13 [10.1103/physrevd.111.l091101].

Search for D0 meson decays to π+ π− e+ e− and K+ K− e+ e− final states

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zenesini, F.;
2025

Abstract

A search for D0 meson decays to the π+ π− e+ e− and K+ K− e+ e− final states is reported using a sample of proton-proton collisions collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb^−1. The decay D0 → π+ π− e+ e− is observed for the first time when requiring that the two electrons are consistent with coming from the decay of a ϕ or ρ0/ω meson. The corresponding branching fractions are measured relative to the D0 → K− π+ [e+ e−]ρ0/ω decay, where the two electrons are consistent with coming from the decay of a ρ0 or ω meson. No evidence is found for the D0 → K+ K− e+ e− decay and world-best limits are set on its branching fraction. The results are compared to, and found to be consistent with, the branching fractions of the D0 → π+ π− μ+ μ− and D0 → K+ K− μ+ μ− decays recently measured by LHCb and confirm lepton universality at the current precision.
2025
Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. a., et al. (2025). Search for D0 meson decays to π+ π− e+ e− and K+ K− e+ e− final states. PHYSICAL REVIEW D, 111(9), 1-13 [10.1103/physrevd.111.l091101].
Aaij, R.; Abdelmotteleb, A.  s.  w.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A.  a.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapop...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1034971
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