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

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

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

S045CP1

VALUE (%)

EVTS

DOCUMENT ID

TECN

COMMENT

$9.5$ $\pm6.8$ $\pm0.5$

0.62k

ABUMUSABH

2026

BEL2

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

¹ ABUMUSABH 2026H reports the sum $\mathit A_{CP}$( ${{\mathit \Lambda}_{{{c}}}^{+}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{+}}{{\mathit K}^{-}}$) + $\mathit A_{CP}$( ${{\mathit \Xi}_{{{c}}}^{+}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) = ($13.4$ $\pm7.0$ $\pm0.9)\%$ 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