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首页> 外文期刊>The journal of high energy physics >Model-independent determination of the strong phase difference between D 0 and D ˉ 0 π + π ? π + π ? $$ {overline{D}}^0o {pi}^{+}{pi}^{-}{pi}^{+}{pi}^{-} $$ amplitudes
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Model-independent determination of the strong phase difference between D 0 and D ˉ 0 π + π ? π + π ? $$ {overline{D}}^0o {pi}^{+}{pi}^{-}{pi}^{+}{pi}^{-} $$ amplitudes

机译:独立于模型确定<重点类型=“斜体”> D 0 d ˉ 0 π + π π + π $$ { overline {d}} ^ 0 到{ pi} ^ {+} { pi} ^ { - - } { pi} ^ {+} { pi} ^ { - } $$ 幅度

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A bstract For the first time, the strong phase difference between D _(0)and D ˉ 0 → π + π ? π + π ? $$ {overline{D}}^0o {pi}^{+}{pi}^{-}{pi}^{+}{pi}^{-} $$ amplitudes is determined in bins of the decay phase space. The measurement uses 818 pb_(?1)of e _(+) e _(?)collision data that is taken at the ψ(3770) resonance and collected by the CLEO-c experiment. The measurement is important for the determination of the CP -violating phase γ in B _(±)→ DK _(±)(and similar) decays, where the D meson (which represents a superposition of D _(0)and D ˉ 0 $$ {overline{D}}^0 $$ ) subsequently decays to π _(+) π _(?) π _(+) π _(?). To obtain optimal sensitivity to γ, the phase space of the D → π _(+) π _(?) π _(+) π _(?)decay is divided into bins based on a recent amplitude model of the decay. Although an amplitude model is used to define the bins, the measurements obtained are model-independent. The CP -even fraction of the D → π _(+) π _(?) π _(+) π _(?)decay is determined to be F ~(+)_(4 π ) ?=?0.769?±?0.021?±?0.010, where the uncertainties are statistical and systematic, respectively. Using simulated B _(±)→ DK _(±), D → π _(+) π _(?) π _(+) π _(?)decays, it is estimated that by the end of the current LHC run, the LHCb experiment could determine γ from this decay mode with an uncertainty of (±10 ± 7)°, where the first uncertainty is statistical based on estimated LHCb event yields, and the second is due to the uncertainties on the parameters determined in this paper.
机译:一个第一次的Bstract,D _(0)和D≠0→π+π之间的强相差异。 π+π? $$ { {划线d}} ^ 0 到{ PI} ^ {+} { PI} ^ { - } { PI} ^ {+} { PI} ^ { - } $$幅度被确定在衰变阶段空间的垃圾箱中。测量使用在ψ(3770)谐振中拍摄的E _(+)e_(α)碰撞数据的818pb _(Δ1),并由Cleo-C实验收集。测量对于在B _(±)→DK _(±)(和类似)衰变中的CP硫化相γ是重要的,其中D MESON(表示D _(0)和D的叠加0 $$ { overline {d}} ^ 0 $$)随后衰减到π_(+)π_(?)π_(+)π_(?)。为了获得对γ的最佳敏感性,基于最近衰减的幅度模型将D→π_(+)π_(+)π(+)π(+)Π_(+)Π_(Δ)衰减的相位空间被分成垃圾箱。尽管使用幅度模型来定义距离,但是获得的测量值独立于模型。将D→π_(+)π_(α)π_(+)π_(+)Π(Δ)衰减的Cp -even部分被确定为f〜(+)_(4π)?=?0.769?± ?0.021?±0.010,其中不确定性分别是统计和系统的。使用模拟B _(±)→DK _(±),d→π_(+)π_(α)Π_(+)Π_(Δ)衰减,估计在当前LHC的结尾运行,LHCB实验可以从该衰减模式确定γ,不确定度(±10±7)°,其中第一个不确定性是基于估计的LHCB事件产量的统计,第二个是由于该参数上的不确定性纸。

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