Exploring charm decays with missing energy in leptoquark models
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 [inline-graphic not available: see fulltext] carried away by either standard model or sterile neutrinos. We focus on scenarios involving the R2, R∼2, and 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 →[inline-graphic not available: see fulltext], M = π, ρ, and Ds→[inline-graphic not available: see fulltext] and singly charmed baryon decays Λc+→[inline-graphic not available: see fulltext] and Ξc→[inline-graphic not available: see fulltext] are presently allowed to attain the 10−7-10−6 levels if induced by R2 and that the impact of R∼2 is comparatively much less. In contrast, the contributions of 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.
- Publication:
-
Journal of High Energy Physics
- Pub Date:
- April 2021
- DOI:
- 10.1007/JHEP04(2021)246
- arXiv:
- arXiv:2012.15847
- Bibcode:
- 2021JHEP...04..246F
- Keywords:
-
- Beyond Standard Model;
- Heavy Quark Physics;
- Effective Field Theories;
- Neutrino Physics;
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment
- E-Print:
- 16 pages, no figure, comments &