$\mathit T$ and $\mathit CPT$ VIOLATION PARAMETERS

Measured values of the $\mathit T$-, $\mathit CP$-, and $\mathit CPT$-asymmetry parameters, defined as the differences in S${}^{\pm{}}_{{{\mathit \alpha}} ,{{\mathit \beta}} }$ and C${}^{\pm{}}_{{{\mathit \alpha}} ,{{\mathit \beta}} }$ between symmetry-transformed transitions. The indices ${{\mathit \alpha}}$ = ${{\mathit \ell}^{+}}$ , ${{\mathit \ell}^{-}}$ and ${{\mathit \beta}}$ = ${{\mathit K}_S^0}$ , ${{\mathit K}_L^0}$ stand for reconstructed the flavor final state and the $\mathit CP$ final states from ${{\mathit \Upsilon}{(4S)}}$ decay. The sign $\pm{}$ indicates whether the decay to the flavor final state ${{\mathit \alpha}}$ occurs before or after the decay to the $\mathit CP$ final state.
Alternatively, violations of $\mathit CPT$ symmetry and Lorentz invariance are searched for by studying interference effects in ${{\mathit B}^{0}}$ mixing. Results are expressed in terms of the standard model extension parameter ${{\mathit \Delta}}{{\mathit a}}$ , which describes the difference between the couplings of the valence quarks within ${{\mathit B}^{0}}$ meson with the Lorentz-violating fields.

$\Delta {{\mathit C}_{{T}}^{-}}$ (C${}^{+}_{{{\mathit \ell}} {}^{-},{{\mathit K}_S^0} }$ $−$ C${}^{-}_{{{\mathit \ell}} {}^{+},{{\mathit K}_S^0} }$)

INSPIRE  
VALUE DOCUMENT ID TECN  COMMENT
$0.04$ $\pm0.14$ $\pm0.08$
LEES
2012W
BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
Conservation Laws:
TIME REVERSAL ($\mathit T$) INVARIANCE
References:
LEES 2012W
PRL 109 211801 Observation of Time-Reversal Violation in the ${{\mathit B}^{0}}$ Meson System