Measurement of the CKM angle γ in B± → DK± and B± → Dπ± decays with D → K S 0 $$ {K}_{\mathrm{S}}^0 $$ h+h−
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13130_2021_Article_14895.pdf
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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
February 19, 2021
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2021 Feb 19;2021(2):169
Version
Final published version
Abstract
Abstract
A measurement of CP-violating observables is performed using the decays B± → DK± and B± → Dπ±, where the D meson is reconstructed in one of the self-conjugate three-body final states
K
S
0
$$ {K}_{\mathrm{S}}^0 $$
π+π− and
K
S
0
$$ {K}_{\mathrm{S}}^0 $$
K+K− (commonly denoted
K
S
0
$$ {K}_{\mathrm{S}}^0 $$
h+h−). The decays are analysed in bins of the D-decay phase space, leading to a measurement that is independent of the modelling of the D-decay amplitude. The observables are inter- preted in terms of the CKM angle γ. Using a data sample corresponding to an integrated luminosity of 9 fb−1 collected in proton-proton collisions at centre-of mass energies of 7, 8, and 13 TeV with the LHCb experiment, γ is measured to be
68.7
−
5.1
+
5.2
°
$$ \left({68.7}_{-5.1}^{+5.2}\right){}^{\circ} $$
. The hadronic parameters
r
B
DK
,
r
B
Dπ
,
δ
B
DK
,
and
δ
B
Dπ
$$ {r}_B^{D K},{r}_B^{D\pi},{\delta}_B^{D K},\kern0.5em \mathrm{and}\kern0.5em {\delta}_B^{D\pi} $$
, which are the ratios and strong-phase differences of the suppressed and favoured B± decays, are also reported.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1007/JHEP02(2021)169
