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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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
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 shu
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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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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
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 σx=0.057% and σy=0.049%. These are about an order of magnitude improvement on current experimental results, without considering background effects.

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