Search for CP violation in the phase space of $$ {D}^0\to {K}_S^0{K}^{\pm }{\pi}^{\mp } $$ decays with the energy test
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13130_2024_Article_23051.pdf
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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
March 19, 2024
Journal
Journal of High Energy Physics
Publisher
Springer Science and Business Media LLC
Citation
Journal of High Energy Physics. 2024 Mar 19;2024(3):107
Version
Final published version
Abstract
A search for CP violation in
D
0
→
K
S
0
K
+
π
−
$$ {D}^0\to {K}_S^0{K}^{+}{\pi}^{-} $$
and
D
0
→
K
S
0
K
−
π
+
$$ {D}^0\to {K}_S^0{K}^{-}{\pi}^{+} $$
decays is reported. The search is performed using an unbinned model-independent method known as the energy test that probes local CP violation in the phase space of the decays. The data analysed correspond to an integrated luminosity of 5.4 fb−1 collected in proton-proton collisions by the LHCb experiment at a centre-of-mass energy of
s
$$ \sqrt{s} $$
= 13 TeV, amounting to approximately 950 thousand and 620 thousand signal candidates for the
D
0
→
K
S
0
K
−
π
+
$$ {D}^0\to {K}_S^0{K}^{-}{\pi}^{+} $$
and
D
0
→
K
S
0
K
+
π
−
$$ {D}^0\to {K}_S^0{K}^{+}{\pi}^{-} $$
modes, respectively. The method is validated using D0 → K−π+π−π+ and
D
0
→
K
S
0
π
+
π
−
$$ {D}^0\to {K}_S^0{\pi}^{+}{\pi}^{-} $$
decays, where CP-violating effects are expected to be negligible, and using background-enhanced regions of the signal decays. The results are consistent with CP symmetry in both the
D
0
→
K
S
0
K
−
π
+
$$ {D}^0\to {K}_S^0{K}^{-}{\pi}^{+} $$
and the
D
0
→
K
S
0
K
+
π
−
$$ {D}^0\to {K}_S^0{K}^{+}{\pi}^{-} $$
decays, with p-values for the hypothesis of no CP violation of 70% and 66%, respectively.
Subjects
Nuclear and High Energy Physics
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/jhep03(2024)107
