$\mathit CP$ VIOLATION PARAMETERS

cos $ 2\beta $ ( ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}^{*}{(892)}^{0}}$ )

INSPIRE   PDGID:
S042CJ1
$\beta $ ($\phi _{1}$) is one of the angles of CMK unitarity triangle, see the review on “$\mathit CP$” Violation in the Reviews section.
VALUE DOCUMENT ID TECN  COMMENT
$\bf{ 1.7 {}^{+0.7}_{-0.9}}$ OUR AVERAGE  Error includes scale factor of 1.6.
$2.72$ ${}^{+0.50}_{-0.79}$ $\pm0.27$ 1
AUBERT
2005P
 BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$0.87$ $\pm0.74$ $\pm0.12$ 2
ITOH
2005
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
1  The measurement is obtained when sin$ 2\beta $ is fixed to 0.726 and the sign of cos $ 2\beta $ is positive with 86$\%$ confidence level.
2  The measurement is obtained with sin$ 2\beta $ fixed to 0.731.
Conservation Laws:
$\mathit CP$ INVARIANCE
References:
AUBERT 2005P
PR D71 032005 Time-Integrated and Time-Dependent Angular Analyses of ${{\mathit B}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}}{{\mathit \pi}}$ : A Measurement of cos2$\beta $ with No Sign Ambiguity from Strong Phases
ITOH 2005
PRL 95 091601 Studies of $\mathit CP$ Violation in ${{\mathit B}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}^{*}}$ Decays