000004201 001__ 4201
000004201 005__ 20240401053350.0
000004201 037__ $$aBELLE2-PTHESIS-2024-007
000004201 041__ $$aeng
000004201 100__ $$aYuma Uematsu
000004201 245__ $$aMeasurement of time-dependent CP asymmetry in B0 -> KS0 π0 γ decays at the Belle II experiment
000004201 260__ $$aTokyo$$bThe University of Tokyo$$c2023
000004201 300__ $$a192
000004201 500__ $$aPresented on 26 07 2023
000004201 502__ $$aPhD$$bTokyo, The University of Tokyo$$c2023
000004201 520__ $$aWe measure the time-dependent CP asymmetries in B0 -> KS0 π0 γ decay using (387.5 ± 5.8) × 10^6 BBbar pairs collected near the Υ(4S) resonance with SuperKEKB and Belle II from 2019 to 2022. For the measurement, we reconstruct one neutral B meson in the B0 -> KS0 π0 γ decay channel, identify the flavor of the accompanying  B meson from its decay products, and measure the proper-time difference between the two B mesons. We obtain the following results: for the KS0 π0 invariant mass around K∗(892)0 resonance (0.8 to 1.0 GeV/c2), S_CP(K∗0γ) = 0.00 +0.27−0.26(stat) +0.03−0.04(syst) and   A_CP(K∗0γ) = −0.10 ± 0.13(stat) ± 0.03(syst), and for the rest of the mass regions up to 1.8 GeV/c2, S_CP(KS0π0γ) = +0.04 +0.45−0.44(stat) ± 0.10(syst) and A_CP(KS0π0γ) = +0.06 ± 0.25(stat) ± 0.07(syst). These results are the most precise to date as a single measurement.
000004201 700__ $$aYutaka Ushiroda$$edir.
000004201 8560_ $$fuematsu@hep.phys.s.u-tokyo.ac.jp
000004201 8564_ $$uhttps://docs.belle2.org/record/4201/files/BELLE2-PTHESIS-2024-007.pdf
000004201 980__ $$aTHESIS