D0-D0 mixing sensitivity estimation at Belle Ⅱ in wrong-sign decays D0&rarr;K+&pi;-&pi;0 via time-dependent amplitude analysis

Long-Ke Li; Ye-Qi Chen; Wen-Biao Yan; Zi-Ping Zhang

doi:10.1088/1674-1137/41/2/023001

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

D⁰-D⁰ mixing sensitivity estimation at Belle Ⅱ in wrong-sign decays D⁰→K⁺π^-π⁰ via time-dependent amplitude analysis

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

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Abstract：
The sensitivity of the D⁰-D⁰ mixing parameters x and y is estimated in the wrong-sign decay D⁰→K⁺π^-π⁰ by time-dependent amplitude analysis. The resolution of the D⁰ lifetime is essential in time-dependent Dalitz analyses. The Belle Ⅱ detector, which aims to collect a total integrated luminosity of 50 ab^-1 of 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 D⁰-D⁰ mixing 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. D⁰-D⁰ mixing sensitivity estimation at Belle Ⅱ in wrong-sign decays D⁰→K⁺π^-π⁰ via 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-D⁰ mixing sensitivity estimation at Belle Ⅱ in wrong-sign decays D⁰→K⁺π^-π⁰ via 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-D⁰ mixing parameters x and y is estimated in the wrong-sign decay D⁰→K⁺π^-π⁰ by time-dependent amplitude analysis. The resolution of the D⁰ lifetime is essential in time-dependent Dalitz analyses. The Belle Ⅱ detector, which aims to collect a total integrated luminosity of 50 ab^-1 of 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 D⁰-D⁰ mixing 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.

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D⁰-D⁰ mixing sensitivity estimation at Belle Ⅱ in wrong-sign decays D⁰→K⁺π^-π⁰ via time-dependent amplitude analysis

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D⁰-D⁰ mixing sensitivity estimation at Belle Ⅱ in wrong-sign decays D⁰→K⁺π^-π⁰ via time-dependent amplitude analysis

Corresponding author: Long-Ke Li,

Corresponding author: Ye-Qi Chen,

Corresponding author: Wen-Biao Yan,

Corresponding author: Zi-Ping Zhang,

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