Search for CP violation in the phase space of $$ {D}^0\to {K}_S^0{K}^{\pm }{\pi}^{\mp } $$ decays with the energy test
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.; Aidala, C. A.; Ajaltouni, Z.; Akar, S.; Akiba, K.; Albicocco, P.; Albrecht, J.; Alessio, F.; ... Show more Show less
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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.
Date issued
2024-03-19Department
Massachusetts Institute of Technology. Department of PhysicsJournal
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
ISSN
1029-8479
Keywords
Nuclear and High Energy Physics