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$\mathit CP$ VIOLATION PARAMETERS

$\mathit C_{{{\mathit K}^{0}} {{\mathit \pi}^{0}}}$ ( ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit K}^{0}}{{\mathit \pi}^{0}}$)

VALUE

DOCUMENT ID

TECN

COMMENT

$\bf{ 0.00 \pm0.08}$

OUR AVERAGE

$-0.01$ $\pm0.12$ $\pm0.04$

BELL

${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$

$-0.14$ $\pm0.13$ $\pm0.06$

BELL

${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$

$0.13$ $\pm0.13$ $\pm0.03$

BABR

${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$

• • We do not use the following data for averages, fits, limits, etc. • •

$-0.06$ $\pm0.15$ $\pm0.04$

BELL

${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$

$-0.04$ ${}^{+0.14}_{-0.15}$ $\pm0.05$

BELL

${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$

$0.24$ $\pm0.15$ $\pm0.03$

BABR

Repl. by AUBERT 2009I

$0.05$ $\pm0.14$ $\pm0.05$

BELL

Repl. by FUJIKAWA 2010A

$0.06$ $\pm0.18$ $\pm0.03$

BABR

Repl. by AUBERT 2008E

$-0.16$ $\pm0.29$ $\pm0.05$

BELL

Repl. by CHEN 2005B

$0.11$ $\pm0.20$ $\pm0.09$

BELL

Repl. by CHAO 2007

$-0.03$ $\pm0.36$ $\pm0.11$

BABR

Repl. by AUBERT,B 2004M

$0.40$ ${}^{+0.27}_{-0.28}$ $\pm0.09$

BABR

Repl. by AUBERT 2005Y

¹	This is the combined result of this analysis (ADACHI 2024) and ADACHI 2023E.

²	Reports $\mathit A$ which is equal to $−\mathit C$.

³	The measurement is using BELL II data reported in ADACHI 2024. The combination with ADACHI 2023E is also reported.

⁴	The result has been combined with ADACHI 2024.

⁵	Corresponds to a 90$\%$ CL interval of $-0.33$ $<$ $\mathit A_{CP}$ $<$ 0.64.

⁶	Based on a total signal yield of $122$ $\pm16$ events.

Conservation Laws:

$\mathit CP$ INVARIANCE

Except where otherwise noted, content of the 2024 Review of Particle Physics is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) license. The publication of the Review of Particle Physics is supported by US DOE, MEXT (Japan), INFN (Italy) and CERN. Individual collaborators receive support for their PDG activities from their respective institutes or funding agencies. © 2024. See LBNL disclaimers.