Measurement of the CKM angle γ using the B± → D*h± channels
Name
13130_2023_Article_22323.pdf
Size
1.42 MB
Format
Adobe PDF
Checksum (MD5)
c385d9e64b7bcc0595b3b8c325df957c
Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Abellan Beteta, C.
Abudinén, F.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Adlarson, P.
Afsharnia, H.
Agapopoulou, C.
Date Issued
December 1, 2023
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2023 Dec 01;2023(12):13
Version
Final published version
Abstract
A measurement of the CP-violating observables from B± → D*K± and B± → D*π± decays is presented, where D*(D) is an admixture of D*0 and
D
¯
∗
0
$$ {\overline{D}}^{\ast 0} $$
(D0 and
D
¯
0
$$ {\overline{D}}^0 $$
) states and is reconstructed through the decay chains D* → Dπ0/γ and
D
→
K
S
0
π
+
π
−
/
K
S
0
K
+
K
−
$$ D\to {K}_S^0{\pi}^{+}{\pi}^{-}/{K}_S^0{K}^{+}{K}^{-} $$
. The measurement is performed by analysing the signal yield variation across the D decay phase space and is independent of any amplitude model. The data sample used was collected by the LHCb experiment in proton-proton collisions and corresponds to a total integrated luminosity of 9 fb−1 at centre-of-mass energies of 7, 8 and 13 TeV. The CKM angle γ is determined to be
69
−
14
+
13
∘
$$ {\left({69}_{-14}^{+13}\right)}^{\circ } $$
using the measured CP-violating observables. The hadronic parameters
r
B
D
∗
K
±
,
r
B
D
∗
π
±
,
δ
B
D
∗
K
±
,
δ
B
D
∗
π
±
$$ {r}_B^{D^{\ast }{K}^{\pm }},{r}_B^{D^{\ast }{\pi}^{\pm }},{\delta}_B^{D^{\ast }{K}^{\pm }},{\delta}_B^{D^{\ast }{\pi}^{\pm }} $$
, which are the ratios and strong phase differences between favoured and suppressed B± decays, are also reported.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/JHEP12(2023)013
