$\mathit CP$ VIOLATION PARAMETERS

$\mathit A_{CP}$ ( ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit \pi}^{-}}$ )

INSPIRE   PDGID:
S042ACP
VALUE DOCUMENT ID TECN  COMMENT
$\bf{ -0.0834 \pm0.0032}$ OUR AVERAGE
$-0.0824$ $\pm0.0033$ $\pm0.0033$
AAIJ
2021O
 LHCB ${{\mathit p}}{{\mathit p}}$ at 13 TeV
$-0.084$ $\pm0.004$ $\pm0.003$
AAIJ
2018O
 LHCB ${{\mathit p}}{{\mathit p}}$ at 7, 8 TeV
$-0.083$ $\pm0.013$ $\pm0.004$
AALTONEN
2014P
 CDF ${{\mathit p}}{{\overline{\mathit p}}}$ at 1.96 TeV
$-0.069$ $\pm0.014$ $\pm0.007$
DUH
2013
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$-0.107$ $\pm0.016$ ${}^{+0.006}_{-0.004}$
LEES
2013D
 BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$-0.04$ $\pm0.16$ 1
CHEN
2000
CLE2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$-0.080$ $\pm0.007$ $\pm0.003$
AAIJ
2013AX
 LHCB Repl. by AAIJ 2018O
$-0.088$ $\pm0.011$ $\pm0.008$
AAIJ
2012V
 LHCB Repl. by AAIJ 2013AX
$-0.086$ $\pm0.023$ $\pm0.009$
AALTONEN
2011N
 CDF Repl. by AALTONEN 2014P
$-0.094$ $\pm0.018$ $\pm0.008$
LIN
2008
BELL Repl. by DUH 2013
$-0.107$ $\pm0.018$ ${}^{+0.007}_{-0.004}$
AUBERT
2007AF
 BABR Repl. by LEES 2013D
$-0.013$ $\pm0.078$ $\pm0.012$
ABULENCIA,A
2006D
 CDF Repl. by AALTONEN 2011N
$-0.088$ $\pm0.035$ $\pm0.013$ 2
CHAO
2005A
 BELL Repl. by CHAO 2004B
$-0.133$ $\pm0.030$ $\pm0.009$ 3
AUBERT,B
2004K
 BABR Repl. by AUBERT 2007AF
$-0.101$ $\pm0.025$ $\pm0.005$ 4
CHAO
2004B
 BELL Repl. by LIN 2008
$-0.07$ $\pm0.08$ $\pm0.02$ 5
AUBERT
2002D
 BABR Repl. by AUBERT 2002Q
$-0.102$ $\pm0.050$ $\pm0.016$ 6
AUBERT
2002Q
 BABR Repl. by AUBERT,B 2004K
$-0.06$ $\pm0.09$ ${}^{+0.01}_{-0.02}$ 7
CASEY
2002
BELL Repl. by CHAO 2004B
$0.044$ ${}^{+0.186}_{-0.167}$ ${}^{+0.018}_{-0.021}$ 8
ABE
2001K
 BELL Repl. by CASEY 2002
$-0.19$ $\pm0.10$ $\pm0.03$ 9
AUBERT
2001E
 BABR Repl. by AUBERT 2002Q
1  Corresponds to 90$\%$ confidence range $-0.30<\mathit A_{\mathit CP}<0.22$.
2  Corresponds to a 90$\%$ CL interval of $-0.15$ $<$ $\mathit A_{CP}$ $<$ $-0.03$.
3  Based on a total signal yield of N( ${{\mathit K}^{-}}{{\mathit \pi}^{+}}$ ) + N( ${{\mathit K}^{+}}{{\mathit \pi}^{-}}$ ) = $1606$ $\pm51$ events.
4  CHAO 2004B reports significance of 3.9 standard deviation for deviation of ${{\mathit A}_{{CP}}}$ from zero.
5  Corresponds to 90$\%$ confidence range $-0.21<\mathit A_{\mathit CP}<0.07$.
6  Corresponds to 90$\%$ confidence range $-0.188<\mathit A_{\mathit CP}<-0.016$.
7  Corresponds to 90$\%$ confidence range $-0.21<\mathit A_{\mathit CP}<+0.09$.
8  Corresponds to 90$\%$ confidence range $-0.25<\mathit A_{\mathit CP}<0.37$.
9  Corresponds to 90$\%$ confidence range $-0.35<\mathit A_{\mathit CP}<-0.03$.
Conservation Laws:
$\mathit CP$ VIOLATION OBSERVED
References:
AAIJ 2021O
JHEP 2103 075 Observation of $CP$ violation in two-body $ {B}_{(s)}^0 $-meson decays to charged pions and kaons
AAIJ 2018O
PR D98 032004 Measurement of $C\!P$ asymmetries in two-body $B_{(s)}^{0}$-meson decays to charged pions and kaons
AALTONEN 2014P
PRL 113 242001 Measurements of Direct $\mathit CP$ -Violating Asymmetries in Charmless Decays of Bottom Baryons
AAIJ 2013AX
PRL 110 221601 First Observation of $\mathit CP$ Violation in the Decays of ${{\mathit B}_{{s}}^{0}}$ Mesons
DUH 2013
PR D87 031103 Measurements of Branching Fractions and Direct $\mathit CP$ Asymmetries for ${{\mathit B}}$ $\rightarrow$ ${{\mathit K}}{{\mathit \pi}}$ , ${{\mathit B}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$ and ${{\mathit B}}$ $\rightarrow$ ${{\mathit K}}{{\mathit K}}$ Decays
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
AAIJ 2012V
PRL 108 201601 First Evidence of Direct $\mathit CP$ Violation in Charmless Two-Body Decays of ${{\mathit B}_{{s}}^{0}}$ Mesons
AALTONEN 2011N
PRL 106 181802 Measurements of Direct $\mathit CP$ Violating Asymmetries in Charmless Decays of Strange Bottom Mesons and Bottom Baryons
LIN 2008
NAT 452 332 Difference in Direct Charge-Parity Violation between Charged and Neutral $\mathit B$ Meson Decays
AUBERT 2007AF
PRL 99 021603 Observation of $\mathit CP$ Violation in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit \pi}^{-}}$ and ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
ABULENCIA,A 2006D
PRL 97 211802 Observation of ${{\mathit B}_{{s}}^{0}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}$ and Measurements of Branching Fractions of Charmless Two Body Decays of ${{\mathit B}^{0}}$ and ${{\mathit B}_{{s}}^{0}}$ Mesons in ${{\overline{\mathit p}}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
CHAO 2005A
PR D71 031502 Improved Measurements of the Partial Rate Asymmetry in ${{\mathit B}}$ $\rightarrow$ ${{\mathit h}}{{\mathit h}}$ Decays
AUBERT,B 2004K
PRL 93 131801 Observation of Direct $\mathit CP$ Violation in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit \pi}^{-}}$ Decays
CHAO 2004B
PRL 93 191802 Evidence for Direct $\mathit CP$ Violation in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit \pi}^{-}}$ Decays
AUBERT 2002D
PR D65 051502 Study of $\mathit CP$ Violating Asymmetries in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ , ${{\mathit K}^{+}}{{\mathit \pi}^{-}}$ Decays
AUBERT 2002Q
PRL 89 281802 Measurements of Branching Fractions and $\mathit CP$-Violating Asymmetries in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ , ${{\mathit K}^{+}}{{\mathit \pi}^{-}}$ , ${{\mathit K}^{+}}{{\mathit K}^{-}}$ Decays
CASEY 2002
PR D66 092002 Charmless Hadronic Two-Body ${{\mathit B}}$ Meson Decays
ABE 2001K
PR D64 071101 Search for Direct $\mathit CP$ Violation in ${{\mathit B}}$ $\rightarrow$ ${{\mathit K}}{{\mathit \pi}}$ Decays
AUBERT 2001E
PRL 87 151802 Measurement of Branching Fractions and Search for $\mathit CP$ Violating Charge Asymmetries in Charmless Two Body ${{\mathit B}}$ Decays in to Pions and Kaons
CHEN 2000
PRL 85 525 Measurement of Charge Asymmetries in Charmless Hadronic in ${{\mathit B}}$ Meson Decays