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
