Rare radiative decays of charm baryons

Abstract

We study weak radiative $|\Delta c|=|\Delta u|=1$ decays of the charmed anti-triplett (${\Lambda }_c$, ${\Xi }_c^{+}$, ${\Xi }_c^0$) and sextet (${\Sigma }_c^{++}$, ${\Sigma }_c^{+}$, ${\Sigma }_c^0$, ${\Xi }_c^{\prime +}$, ${\Xi }_c^{\prime 0}$, ${\Omega }_c$) baryons in the standard model (SM) and beyond. We work out $SU(2)$ and $SU(3{)}_F$-symmetry relations. We propose to study self-analyzing decay chains such as ${\Xi }_c^{+}\to {\Sigma }^{+}(\to p{\pi }^0)\gamma$ and ${\Xi }_c^0\to \Lambda (\to p{\pi }^{-})\gamma$, which enable new physics sensitive polarization studies. SM contributions can be controlled by corresponding analysis of the Cabibbo-favored decays ${\Lambda }_c^{+}\to {\Sigma }^{+}(\to p{\pi }^0)\gamma$ and ${\Xi }_c^0\to {\Xi }^0(\to \Lambda {\pi }^0)\gamma$. Further tests of the SM are available with initially polarized baryons including ${\Lambda }_c\to p\gamma$ together with ${\Lambda }_c\to {\Sigma }^{+}\gamma$ decays, or ${\Omega }_c\to {\Xi }^0\gamma$ together with ${\Omega }_c\to (\Lambda ,{\Sigma }^0)\gamma$. In addition, CP-violating new physics contributions to dipole operators can enhance CP-asymmetries up to few percent.

30 pages, 3 figures, 15 tables

References in corpus (8)

• Observation of $CP$ violation in charm decays
• Weak Decays of Doubly Heavy Baryons: SU(3) Analysis
• Shedding light on CP violation in the charm system via D to V gamma decays
• Endpoint Relations for Baryons
• Photon helicity in Lambda_b --> p K gamma decays
• Testing the standard model with $D_{(s)}\to K_1(\to K\pi \pi )\gamma$ decays
• Radiative three-body D-meson decays in and beyond the standard model
• SU(3) symmetry and its breaking effects in semileptonic heavy baryon decays

Cited by in corpus (3)

• Anatomy of ${\Lambda }_c^{+}$ semileptonic decays
• Weak radiative decay ${\Lambda }_c^{+}\to {\Sigma }^{+}\gamma$ using light-cone sum rules
• First search for the weak radiative decays ${\Lambda }_c^{+}\to {\Sigma }^{+}\gamma$ and ${\Xi }_c^0\to {\Xi }^0\gamma$