论文标题
最轻的魅力标量介子在哪里？
Where is the lightest charmed scalar meson?
论文作者
论文摘要
最轻的魅力标量介子被称为$ d_0^*（2300）$，这是现代$ B $工厂中最早的新强子共鸣之一。我们在这里表明，分配给最轻标量$ d $ -Meson的参数与衰减$ b^ - \ to d^+π^ - π^ - $的精确LHCB数据相抵触。相反，这些数据可以由一个单位化的手性振幅很好地描述，其中包含较轻的魅力标量介子，即$ d_0^*（2100）$。我们还以独立于模型的方式从数据中提取了衰减$ b^ - \ b^ - b^ - \ to d^+π^ - π^ - $的低能$ s $ s $ s $ s $ s $dπ$，并表明它与$dπ$散射相移的差异可以追溯到InterMediate $ρ^ - $ Exchange。我们的工作强调，必须正确地提取单一重型扇区中地面标量介子的性能，以类似于轻标量表中$ f_0（500）$ f_0（500）$和$ k_0^*（700）$。
The lightest charmed scalar meson is known as the $D_0^*(2300)$, which is one of the earliest new hadron resonances observed at modern $B$ factories. We show here that the parameters assigned to the lightest scalar $D$-meson are in conflict with the precise LHCb data of the decay $B^-\to D^+ π^- π^-$. On the contrary, these data can be well described by an unitarized chiral amplitude containing a much lighter charmed scalar meson, the $D_0^*(2100)$. We also extract the low-energy $S$-wave $Dπ$ phase of the decay $B^-\to D^+ π^- π^-$ from the data in a model-independent way, and show that its difference from the $Dπ$ scattering phase shift can be traced back to an intermediate $ρ^-$ exchange. Our work highlights that an analysis of data consistent with chiral symmetry, unitarity, and analyticity is mandatory in order to extract the properties of the ground-state scalar mesons in the singly heavy sector correctly, in analogy to the light scalar mesons $f_0(500)$ and $K_0^*(700)$.
