Abstract
We investigate the possibility that scalar leptoquarks generate consequential effects on the flavor-changing neutral-current decays of charmed hadrons into final states with missing energy carried away by either standard model or sterile neutrinos. We focus on scenarios involving the R2, \( {\tilde{R}}_2 \), and \( {\overline{S}}_1 \) leptoquarks and take into account various pertinent constraints, learning that meson-mixing ones and those inferred from collider searches can be of significance. We find in particular that the branching fractions of charmed meson decays D → , M = π, ρ, and Ds → and singly charmed baryon decays \( {\Lambda}_c^{+} \) → and Ξc → are presently allowed to attain the 10−7-10−6 levels if induced by R2 and that the impact of \( {\tilde{R}}_2 \) is comparatively much less. In contrast, the contributions of \( {\overline{S}}_1 \), which couples to right-handed up-type quarks and the sterile neutrinos, could lead to branching fractions as high as order 10−3. This suggests that these charmed hadron decays might be within reach of the BESIII and Belle II experiments or future super charm-tau factories and could serve as potentially promising probes of leptoquark interactions with sterile neutrinos.
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Faisel, G., Su, JY. & Tandean, J. Exploring charm decays with missing energy in leptoquark models. J. High Energ. Phys. 2021, 246 (2021). https://doi.org/10.1007/JHEP04(2021)246
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DOI: https://doi.org/10.1007/JHEP04(2021)246