Chinese Physics C > 2017, Vol. 41 > Issue(2): 023001 DOI: 10.1088/1674-1137/41/2/023001

D⁰-D⁰mixing sensitivity estimation at Belle Ⅱ in wrong-sign decays D⁰→K⁺π^-π⁰via time-dependent amplitude analysis

1.
University of Science and Technology of China, Hefei 230026, China

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Abstract：
The sensitivity of the D ⁰- D ⁰mixing parameters xand yis estimated in the wrong-sign decay D ⁰→K ⁺ π ^- π ⁰by time-dependent amplitude analysis. The resolution of the D ⁰lifetime is essential in time-dependent Dalitz analyses. The Belle Ⅱ detector, which aims to collect a total integrated luminosity of 50 ab ^-1of data, has σ=140 fs in Monte Carlo studies, a factor of two improvement over that of Belle and BaBar, so the produced Dalitz signal Monte Carlo samples are smeared with this resolution. Then a time-dependent Dalitz plot fitting is performed on these smeared samples, and the sensitivity of D ⁰- D ⁰mixing parameters are σ _x=0.057% and σ _y=0.049%. These are about an order of magnitude improvement on current experimental results, without considering background effects.
- D0-D0 mixing,
- sensitivity estimation,
- time-dependent amplitude analysis,
- wrong-sign decay,
- Belle Ⅱ

References

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Long-Ke Li, Ye-Qi Chen, Wen-Biao Yan and Zi-Ping Zhang. D ⁰-D ⁰mixing sensitivity estimation at Belle Ⅱ in wrong-sign decays D ⁰→K ⁺ π ^- π ⁰via time-dependent amplitude analysis[J]. Chinese Physics C, 2017, 41(2): 023001. doi: 10.1088/1674-1137/41/2/023001

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Received: 2016-09-21
Revised: 2016-10-14

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Supported by National Natural Science Foundation of China (11475164, 11475169, 11675166)

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通讯作者:陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

D⁰-D⁰mixing sensitivity estimation at Belle Ⅱ in wrong-sign decays D⁰→K⁺π^-π⁰via time-dependent amplitude analysis

Corresponding author:Long-Ke Li,

Corresponding author:Ye-Qi Chen,

Corresponding author:Wen-Biao Yan,

Corresponding author:Zi-Ping Zhang,

1. University of Science and Technology of China, Hefei 230026, China

Received Date:2016-09-21
Accepted Date:2016-10-14
Available Online:2017-02-05

Fund Project:Supported by National Natural Science Foundation of China (11475164, 11475169, 11675166)

Abstract:The sensitivity of the D⁰-D⁰mixing parametersxandyis estimated in the wrong-sign decay D⁰→K⁺π^-π⁰by time-dependent amplitude analysis. The resolution of the D⁰lifetime is essential in time-dependent Dalitz analyses. The Belle Ⅱ detector, which aims to collect a total integrated luminosity of 50 ab^-1of data, hasσ=140 fs in Monte Carlo studies, a factor of two improvement over that of Belle and BaBar, so the produced Dalitz signal Monte Carlo samples are smeared with this resolution. Then a time-dependent Dalitz plot fitting is performed on these smeared samples, and the sensitivity of D⁰-D⁰mixing parameters areσ_x=0.057% andσ_y=0.049%. These are about an order of magnitude improvement on current experimental results, without considering background effects.