${{\mathit \Xi}_{{{c}}}^{+}}$, ${{\overline{\mathit \Xi}}_{{{c}}}^{-}}$ $\mathit CP$-VIOLATING DECAY ASYMMETRIES

The asymmetries are zero if $\mathit CP$ is conserved.

$\mathit A_{CP}({{\mathit \Sigma}^{+}}{{\mathit K}^{+}}{{\mathit K}^{-}}$) in ${{\mathit \Xi}_{{{c}}}^{+}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\mathit K}^{+}}{{\mathit K}^{-}}$, ${{\overline{\mathit \Xi}}_{{{c}}}^{-}}$ $\rightarrow$ ${{\overline{\mathit \Sigma}}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ INSPIRE search

S045CP2

VALUE (%)

EVTS

DOCUMENT ID

TECN

COMMENT

$3.7$ $\pm6.6$ $\pm0.6$

0.78k

ABUMUSABH

2026

BEL2

${{\mathit e}^{+}}{{\mathit e}^{-}}$ at or near ${{\mathit \Upsilon}{(4S)}}$

¹ ABUMUSABH 2026H reports the sum $\mathit A_{CP}$( ${{\mathit \Lambda}_{{{c}}}^{+}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) + $\mathit A_{CP}$( ${{\mathit \Xi}_{{{c}}}^{+}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\mathit K}^{+}}{{\mathit K}^{-}}$) = ($4.0$ $\pm6.6$ $\pm0.7)\%$ consistent with U-spin symmetry.

Conservation Laws:

$\mathit CP$ INVARIANCE

References:

ABUMUSABH

2026H

PR D113 032017

Search for $CP$ violation in $?_c^+\to?^+h^+h^-$ and $?_c^+\to ph^+h^-$ at Belle II