Observation of CP violation in two-body B s 0 $$ {B}_{(s)}^0 $$ -meson decays to charged pions and kaons
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Author(s)
Aaij, R.
Abellán Beteta, C.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Afsharnia, H.
Aidala, C. A.
Aiola, S.
Ajaltouni, Z.
Akar, S.
Date Issued
March 8, 2021
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2021 Mar 08;2021(3):75
Version
Final published version
Abstract
Abstract
The time-dependent CP asymmetries of B0 → π+π− and
B
s
0
$$ {B}_s^0 $$
→ K+K− decays are measured using a data sample of pp collisions corresponding to an integrated luminosity of 1.9 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. The results are
C
ππ
=
−
0.311
±
0.045
±
0.015
,
S
ππ
=
−
0.706
±
0.042
±
0.013
,
C
KK
=
0.123
±
0.034
±
0.015
,
S
KK
=
0.164
±
0.034
±
0.014
,
A
KK
Δ
Γ
=
−
0.83
±
0.05
±
0.09
,
$$ {\displaystyle \begin{array}{c}{C}_{\pi \pi}=-0.311\pm 0.045\pm 0.015,\\ {}{S}_{\pi \pi}=-0.706\pm 0.042\pm 0.013,\\ {}{C}_{KK}=0.123\pm 0.034\pm 0.015,\\ {}{S}_{KK}=0.164\pm 0.034\pm 0.014,\\ {}{\mathcal{A}}_{KK}^{\Delta \varGamma }=-0.83\pm 0.05\pm 0.09,\end{array}} $$
where the first uncertainties are statistical and the second systematic. The same data sample is used to measure the time-integrated CP asymmetries of B0 → K + π− and
B
s
0
$$ {B}_s^0 $$
→ K−π+ decays and the results are
A
CP
B
0
=
−
0.0824
±
0.0033
±
0.0033
,
A
CP
B
s
0
=
0.236
±
0.013
±
0.011
.
$$ {\displaystyle \begin{array}{c}{A}_{CP}^{B^0}=-0.0824\pm 0.0033\pm 0.0033,\\ {}{A}_{CP}^{B_s^0}=0.236\pm 0.013\pm 0.011.\end{array}} $$
All results are consistent with earlier measurements. A combination of LHCb measurements provides the first observation of time-dependent CP violation in
B
s
0
$$ {B}_s^0 $$
decays.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/JHEP03(2021)075
