A search for the rare radiative leptonic decay Dþs → γeþνe is performed for the first time using electron- positron collision data corresponding to an integrated luminosity of 3.19 fb−1, collected with the BESIII detector at a center-of-mass energy of 4.178 GeV. No evidence for the Dþs → γeþνe decay is seen, and an upper limit of BðDþs → γeþνeÞ < 1.3 × 10−4 is set on the partial branching fraction at a 90% confidence level for radiative photon energies E0γ > 0.01 GeV.
Search for the decay Ds+→γe+νe
Cibinetto, G.;Farinelli, R.;Garzia, I.;Mezzadri, G.;Savrié, M.;
2019
Abstract
A search for the rare radiative leptonic decay Dþs → γeþνe is performed for the first time using electron- positron collision data corresponding to an integrated luminosity of 3.19 fb−1, collected with the BESIII detector at a center-of-mass energy of 4.178 GeV. No evidence for the Dþs → γeþνe decay is seen, and an upper limit of BðDþs → γeþνeÞ < 1.3 × 10−4 is set on the partial branching fraction at a 90% confidence level for radiative photon energies E0γ > 0.01 GeV.File in questo prodotto:
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PhysRevD.99.072002.pdf
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