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arXiv 0802.0545hep-ph
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测量$D^0(\bar D^0)\to f_0(980) K^{*}$中的$D^0-\bar D^0$混合以及更多

Measuring $D^0-\bar D^0$ mixing in $D^0(\bar D^0)\to f_0(980) K^{*}$ and more

Wei Wang, Cai-Dian Lu

摘要:

研究了双Cabibbo抑制(DCS)通道$D^0\to f_0(980)K^{*0}$及其电荷共轭通道中的$D^0-\bar D^0$混合,其中$K^{*0}$介子在$K^+π^-$和$K_Sπ^0$终态中均被重构.虽然衰变$D^0\to f_0(980)K^{*}$的分支比很小,但末态介子相对容易识别。$f_0(980)$介子可以用$π^+π^-$代替,其中$π^+π^-$形成$S$波态,或纵向极化矢量介子$ρ^0,ω$ .所有的混合参数,包括质量差和衰减宽度差,可以通过研究这些通道的时间依赖的衰减宽度提取。我们表明,该方法是有效的,在所有区域的混合参数,它不依赖于强相位差。

英文摘要:

We investigate the $D^0-\bar D^0$ mixing through the doubly Cabibbo suppressed (DCS) channel $D^0\to f_0(980)K^{*0}$ and its charge conjugate channel, in which the $K^{*0}$ meson is reconstructed in both $K^+π^-$ and $K_Sπ^0$ final state. Although the decay $D^0\to f_0(980)K^{*}$ has a small branching ratio, the final state mesons are relatively easy to identify. The $f_0(980)$ meson can be replaced by $π^+π^-$ in which $π^+π^-$ form an $S$-wave state, or a longitudinally polarized vector meson $ρ^0,ω$. All mixing parameters, including the mass difference and decay width difference, can be extracted by studying the time-dependent decay width of these channels. We show that the method is valid in all regions for mixing parameters and it does not depend on the strong phase difference.

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