Measurement of CP Asymmetries in B0KS0π0γ Decays at Belle II

Collaboration
Jul 12, 2024
10 pages
Published in:
  • Phys.Rev.Lett. 134 (2025) 1, 011802
  • Published: Jan 2, 2025
e-Print:
Report number:
  • Belle II Preprint 2024-009,
  • KEK Preprint 2024-1
Experiments:

Citations per year

20222023202401
Abstract: (APS)
We report measurements of time-dependent CP asymmetries in B0KS0π0γ decays based on a data sample of (388±6)×106BB¯ events collected at the ϒ(4S) resonance with the Belle II detector. The Belle II experiment operates at the SuperKEKB asymmetric-energy e+e- collider. We measure decay-time distributions to determine CP -violating parameters S and C. We determine these parameters for two ranges of KS0π0 invariant mass: m(KS0π0)(0.8,1.0)GeV/c2, which is dominated by B0K*0(KS0π0)γ decays, and a complementary region m(KS0π0)(0.6,0.8)(1.0,1.8)GeV/c2. Our results have improved precision as compared to previous measurements and are consistent with theory predictions.
Note:
  • 10 pages, 4 figures