$\mathit CP$ VIOLATION PARAMETERS

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

INSPIRE   PDGID:
S042CX6
VALUE DOCUMENT ID TECN  COMMENT
$\bf{ -0.33 \pm0.22}$ OUR AVERAGE
$-0.14$ $\pm0.36$ $\pm0.10$ 1
JULIUS
2017
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$-0.43$ $\pm0.26$ $\pm0.05$
LEES
2013D
 BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$-0.49$ $\pm0.35$ $\pm0.05$
AUBERT
2007BC
 BABR Repl. by LEES 2013D
$-0.12$ $\pm0.56$ $\pm0.06$ 2
AUBERT
2005L
 BABR Repl. by AUBERT 2007BC
$-0.44$ ${}^{+0.52}_{-0.53}$ $\pm0.17$ 1
CHAO
2005
BELL Repl. by JULIUS 2017
1  BELLE Collab. quotes $\mathit A_{ {{\mathit \pi}^{0}} {{\mathit \pi}^{0}} }$ which is equal to $−\mathit C_{ {{\mathit \pi}^{0}} {{\mathit \pi}^{0}} }$.
2  Corresponds to a 90$\%$ CL interval of $-0.88$ $<$ $\mathit A_{CP}$ $<$ 0.64.
Conservation Laws:
$\mathit CP$ INVARIANCE
References:
JULIUS 2017
PR D96 032007 Measurement of the Branching Fraction and $\mathit CP$ Asymmetry in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ Decays, and an Improved Constraint on ${{\mathit \phi}_{{2}}}$
LEES 2013D
PR D87 052009 Measurement of $\mathit CP$ Asymmetries and Branching Fractions in Charmless Two-Body ${{\mathit B}}$-Meson Decays to Pions and Kaons
AUBERT 2007BC
PR D76 091102 Study of ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ , ${{\mathit B}^{\pm}}$ $\rightarrow$ ${{\mathit \pi}^{\pm}}{{\mathit \pi}^{0}}$ , and ${{\mathit B}^{\pm}}$ $\rightarrow$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{0}}$ decays, and Isospin Analysis of ${{\mathit B}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$ Decays
AUBERT 2005L
PRL 94 181802 Branching Fractions and $\mathit CP$ Asymmetries in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ , ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{0}}$ and ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit \pi}^{0}}$ Decays and Isospin Analysis of the ${{\mathit B}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$ System
CHAO 2005
PRL 94 181803 Observation of ${{\mathit B}^{0}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$