Dalitz analysis of $D^{0}\to K^{-}\pi^{+}\eta$ decays at Belle

Chen, Y.Q.; Li, L.K.; Yan, W.B.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D.M.; Atmacan, H.; Aulchenko, V.; Aushev, T.

doi:10.1103/PhysRevD.102.012002

Dalitz analysis of $D^{0}\to K^{-}\pi^{+}\eta$ decays at Belle

Belle

Collaboration

•

Y.Q. Chen
(
- CUST, SKLPDE
)

Mar 17, 2020

12 pages

Published in:

Phys.Rev.D 102 (2020) 1, 012002

Published: Jul 6, 2020

e-Print:

2003.07759 [hep-ex]

DOI:

10.1103/PhysRevD.102.012002 (publication)

PDG:

{{\mathit a}_{{{0}}}{(980)}}

\rightarrow

{{\mathit \eta}^{\,'}}{{\mathit \pi}}

Report number:

KEK Preprint 2019-60,
Belle Preprint 2020-04,
KEK Preprint 2020-04,
UCHEP-20-01

Experiments:

KEK-BF-BELLE

View in:

ADS Abstract Service

reference search25 citations

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Abstract: (APS)

We present the results of the first Dalitz plot analysis of the decay D0→K-π+η. The analysis is performed on a data set corresponding to an integrated luminosity of 953 fb-1 collected by the Belle detector at the asymmetric-energy e+e- KEKB collider. The Dalitz plot is well described by a combination of the six resonant decay channels K¯*(892)0η, K-a0(980)+, K-a2(1320)+, K¯*(1410)0η, K*(1680)-π+ and K2*(1980)-π+, together with Kπ and Kη S-wave components. The decays K*(1680)-→K-η and K2*(1980)-→K-η are observed for the first time. We measure ratio of the branching fractions, B(D0→K-π+η)B(D0→K-π+)=0.500±0.002(stat)±0.020(syst)±0.003(BPDG). Using the Dalitz fit result, the ratio B(K*(1680)→Kη)B(K*(1680)→Kπ) is measured to be 0.11±0.02(stat)-0.04+0.06(syst)±0.04(BPDG); this is much lower than the theoretical expectations (≈1) made under the assumption that K*(1680) is a pure 13D1 state. The product branching fraction B(D0→[K2*(1980)-→K-η]π+)=(2.2-1.9+1.7)×10-4 is determined. In addition, the πη′ contribution to the a0(980)± resonance shape is confirmed with 10.1σ statistical significance using the three-channel Flatté model. We also measure B(D0→K¯*(892)0η)=(1.41-0.12+0.13)%. This is consistent with, and more precise than, the current world average (1.02±0.30)%, deviates with a significance of more than 3σ from the theoretical predictions of (0.51–0.92)%.

Note:

11 pages, 2 figures

Particle Physics Experiments
electron positron: annihilation
electron positron: colliding beams
resonance: decay
D0: hadronic decay
D0: branching ratio
branching ratio: ratio: measured
measure: ratio
K*(892)
a0(980)

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Dalitz analysis of D0→K−π+ηD^{0}\to K^{-}\pi^{+}\etaD0→K−π+η decays at Belle

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Dalitz analysis of $D^{0}\to K^{-}\pi^{+}\eta$ decays at Belle