$\mathit CP$ VIOLATION PARAMETERS

$\mathit S_{ {{\mathit J / \psi}{(nS)}} {{\mathit K}^{0}} }$ ( ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}{(nS)}}{{\mathit K}^{0}}$ )

INSPIRE   PDGID:
S042SJK
``OUR EVALUATION'' is an average using rescaled values of the data listed below. The average and rescaling were performed by the Heavy Flavor Averaging Group (HFLAV) and are described at https://hflav.web.cern.ch/. The averaging/rescaling procedure takes into account correlations between the measurements.
VALUE DOCUMENT ID TECN  COMMENT
$\bf{ 0.701 \pm0.017}$ OUR EVALUATION  See the ideogram below.
$\bf{ 0.698 \pm0.024}$ OUR AVERAGE  Error includes scale factor of 1.4.  See the ideogram below.
$0.760$ $\pm0.034$ 1, 2
AAIJ
2017BN
 LHCB ${{\mathit p}}{{\mathit p}}$ at 7, 8 TeV
$0.670$ $\pm0.029$ $\pm0.013$ 3
ADACHI
2012A
 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$0.738$ $\pm0.079$ $\pm0.036$ 4
ADACHI
2012A
 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$0.642$ $\pm0.047$ $\pm0.021$ 5
ADACHI
2012A
 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$0.57$ $\pm0.58$ $\pm0.06$ 6
SATO
2012
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(5S)}}$
$0.897$ $\pm0.100$ $\pm0.036$ 4
AUBERT
2009K
 BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$0.666$ $\pm0.031$ $\pm0.013$
AUBERT
2009K
 BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$0.79$ ${}^{+0.41}_{-0.44}$ 7
AFFOLDER
2000C
 CDF ${{\mathit p}}{{\overline{\mathit p}}}$ at 1.8 TeV
$0.84$ ${}^{+0.82}_{-1.04}$ $\pm0.16$ 8
BARATE
2000Q
 ALEP ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}}$
$3.2$ ${}^{+1.8}_{-2.0}$ $\pm0.5$ 9
ACKERSTAFF
1998Z
 OPAL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$0.75$ $\pm0.04$ 10
AAIJ
2017BN
 LHCB ${{\mathit p}}{{\mathit p}}$ at 7, 8 TeV
$0.84$ $\pm0.10$ $\pm0.01$ 11
AAIJ
2017BN
 LHCB ${{\mathit p}}{{\mathit p}}$ at 7, 8 TeV
$0.731$ $\pm0.035$ $\pm0.020$ 12
AAIJ
2015N
 LHCB Repl. by AAIJ 2017BN
$0.73$ $\pm0.07$ $\pm0.04$ 13
AAIJ
2013K
 LHCB Repl. by AAIJ 2015N
$0.650$ $\pm0.029$ $\pm0.018$ 14
SAHOO
2008
BELL Repl. by ADACHI 2012A
$0.72$ $\pm0.09$ $\pm0.03$ 4
SAHOO
2008
BELL Repl. by ADACHI 2012A
$0.642$ $\pm0.031$ $\pm0.017$
CHEN
2007
BELL Repl. by ADACHI 2012A
1  Measurement based on ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}_S^0}$ , ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \psi}{(2S)}}{{\mathit K}_S^0}$ with ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ , ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ and ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ .
2  AAIJ 2017BN provides the correlation coefficient ${{\mathit \rho}}$ = 0.42 between the uncertainties of $\mathit S_{{{\mathit J / \psi}{(nS)}} {{\mathit K}^{0}} }$ (${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}{(nS)}}{{\mathit K}^{0}}$ ) and $\mathit C_{{{\mathit J / \psi}{(nS)}} {{\mathit K}^{0}} }$ (${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}{(nS)}}{{\mathit K}^{0}}$ ) measurements.
3  Uses ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}_S^0}$ decays.
4  Based on ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \psi}{(2S)}}{{\mathit K}_S^0}$ decays.
5  Uses ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}_L^0}$ decays.
6  SATO 2012 uses 121 fb${}^{-1}$ data collected at ${{\mathit \Upsilon}{(5S)}}$ resonance. Uses the ''${{\mathit B}}−{{\mathit \pi}}$ tagging'' where ${{\mathit B}}{{\mathit \pi}^{+}}$ and ${{\mathit B}}{{\mathit \pi}^{-}}$ tagged ${{\mathit J / \psi}}{{\mathit K}_S^0}$ events are compared.
7  AFFOLDER 2000C uses about 400 ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}{(1S)}}{{\mathit K}_S^0}$ events. The production flavor of ${{\mathit B}^{0}}$ was determined using three tagging algorithms: a same-side tag, a jet-charge tag, and a soft-lepton tag.
8  BARATE 2000Q uses 23 candidates for ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}{(1S)}}{{\mathit K}_S^0}$ decays. A combination of jet-charge, vertex-charge, and same-side tagging techniques were used to determine the ${{\mathit B}^{0}}$ production flavor.
9  ACKERSTAFF 1998Z uses 24 candidates for ${{\mathit B}_{{d}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}{(1S)}}{{\mathit K}_S^0}$ decay. A combination of jet-charge and vertex-charge techniques were used to tag the ${{\mathit B}_{{d}}^{0}}$ production flavor.
10  Measurement based on ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}_S^0}$ with ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ and ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ .
11  Measurement based on ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \psi}{(2S)}}{{\mathit K}_S^0}$ with ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ .
12  AAIJ 2015N uses 41,560 flavor-tagged ${{\mathit B}_{{d}}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}_S^0}$ events from 3 fb${}^{-1}$ of integrated luminosity. Provides the correlation coefficient ${{\mathit \rho}}$ = 0.483 between the statistical uncertainties of and measurements.
13  AAIJ 2013K uses 8200 flavor-tagged ${{\mathit B}_{{d}}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}_S^0}$ events from 1 fb${}^{-1}$ of integrated luminosity. Provides the correlation coefficient ${{\mathit \rho}}$ = 0.42 between the statistical uncertainties of $\mathit S_{{{\mathit J / \psi}{(nS)}} {{\mathit K}^{0}} }$ (${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}{(nS)}}{{\mathit K}^{0}}$ ) and $\mathit C_{{{\mathit J / \psi}{(nS)}} {{\mathit K}^{0}} }$ (${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}{(nS)}}{{\mathit K}^{0}}$ ) measurements.
14  Combined result of CHEN 2007 and SAHOO 2008 .

           $\mathit S_{{{\mathit J / \psi}{(nS)}} {{\mathit K}^{0}} }$ (${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}{(nS)}}{{\mathit K}^{0}}$ )
Conservation Laws:
$\mathit CP$ VIOLATION OBSERVED
References:
AAIJ 2017BN
JHEP 1711 170 Measurement of $\mathit CP$ Violation in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}_S^0}$ and ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \psi}{(2S)}}{{\mathit K}_S^0}$ Decays
AAIJ 2015N
PRL 115 031601 Measurement of $\mathit CP$ Violation in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}_S^0}$ Decays
AAIJ 2013K
PL B721 24 Measurement of the Time-Dependent $\mathit CP$ Asymmetry in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}_S^0}$ Decays
ADACHI 2012A
PRL 108 171802 Precise Measurement of the $\mathit CP$ Violation Parameter sin2$\mathit \phi _{1}$ in ${{\mathit B}^{0}}$ $\rightarrow$ ( ${{\mathit c}}{{\overline{\mathit c}}}$) ${{\mathit K}^{0}}$ Decays
SATO 2012
PRL 108 171801 Measurement of the $\mathit CP$-Violation Parameter sin2$\mathit \phi _{1}$ with a New Tagging Method at the ${{\mathit \Upsilon}{(5S)}}$ Resonance
AUBERT 2009K
PR D79 072009 Measurement of Time-Dependent $\mathit CP$ Asymmetry in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit c}}{{\overline{\mathit c}}}{{\mathit K}^{(*)0}}$ Decays
SAHOO 2008
PR D77 091103 Measurements of Time-Dependent $\mathit CP$ Violation in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \psi}{(2S)}}{{\mathit K}_S^0}$ Decays
CHEN 2007
PRL 98 031802 Observation of Time-Dependent $\mathit CP$ Violation in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \eta}^{\,'}}{{\mathit K}^{0}}$ Decays and Improved Measurements of $\mathit CP$ Asymmetries in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit K}^{0}}$ , ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ and ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}^{0}}$ Decays
AFFOLDER 2000C
PR D61 072005 A Measurement of sin$^2\beta $ from ${{\mathit B}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}_S^0}$ with the CDF Detector
BARATE 2000Q
PL B492 259 Study of the $\mathit CP$ Asymmetry of ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}_S^0}$ Decays in ALEPH
ACKERSTAFF 1998Z
EPJ C5 379 Investigation of $\mathit CP$ Violation in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}_S^0}$ Decays at LEP