TY - JOUR

T1 - Amplitude analysis of the decays D0 → π+π−π+π− and D0 → π+π−π0π0*

AU - BESIII Collaboration

AU - Ablikim 麦, M. 迪娜

AU - Achasov, M. n.

AU - Nikolaev, I. b.

AU - Мучной, Николай Юрьевич

PY - 2024/8/1

Y1 - 2024/8/1

N2 - Using e+e− annihilation data corresponding to an integrated luminosity of 2.93 fb−1 taken at the center-of-mass energy √s = 3.773 GeV with the BESIII detector, a joint amplitude analysis is performed on the decays D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η). The fit fractions of individual components are obtained, and large interferences among the dominant components of the decays D0 → a1(1260)π, D0 → π(1300)π, D0 → ρ(770)ρ(770), and D0 → 2(ππ)S are observed in both channels. With the obtained amplitude model, the CP-even fractions of D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η) are determined to be (75.2 ± 1.1stat. ± 1.5syst.) % and (68.9 ± 1.5stat. ± 2.4syst.)%, respectively. The branching fractions of D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η) are measured to be (0.688 ± 0.010stat. ± 0.010syst.)% and (0.951 ± 0.025stat. ± 0.021syst.)%, respectively. The amplitude analysis provides an important model for the binning strategy in measuring the strong phase parameters of D0 → 4π when used to determine the CKM angle γ(ϕ3) via the B− → DK− decay.

AB - Using e+e− annihilation data corresponding to an integrated luminosity of 2.93 fb−1 taken at the center-of-mass energy √s = 3.773 GeV with the BESIII detector, a joint amplitude analysis is performed on the decays D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η). The fit fractions of individual components are obtained, and large interferences among the dominant components of the decays D0 → a1(1260)π, D0 → π(1300)π, D0 → ρ(770)ρ(770), and D0 → 2(ππ)S are observed in both channels. With the obtained amplitude model, the CP-even fractions of D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η) are determined to be (75.2 ± 1.1stat. ± 1.5syst.) % and (68.9 ± 1.5stat. ± 2.4syst.)%, respectively. The branching fractions of D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η) are measured to be (0.688 ± 0.010stat. ± 0.010syst.)% and (0.951 ± 0.025stat. ± 0.021syst.)%, respectively. The amplitude analysis provides an important model for the binning strategy in measuring the strong phase parameters of D0 → 4π when used to determine the CKM angle γ(ϕ3) via the B− → DK− decay.

KW - BESIII

KW - CP-even fraction

KW - D0 meson decays

KW - amplitude analysis

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85199341124&origin=inward&txGid=4c56adb4490a591aeb91cac1383e0dc3

U2 - 10.1088/1674-1137/ad3d4d

DO - 10.1088/1674-1137/ad3d4d

M3 - Article

VL - 48

JO - Chinese Physics C

JF - Chinese Physics C

SN - 1674-1137

IS - 8

M1 - 083001

ER -