Physics Department, Syracuse University, Syracuse, New York 13244-1130, USA.
Phys Rev Lett. 2013 Aug 9;111(6):062001. doi: 10.1103/PhysRevLett.111.062001. Epub 2013 Aug 6.
We consider the relative decay rates of B(0) and Bs(0) mesons into a J/ψ plus a light scalar meson, either the f0(500) (σ) or the f0(980). We show that it is possible to distinguish between the quark content of the scalars being quark-antiquark or tetraquark by measuring specific ratios of decay rates. Using current data we determine the ratio of form factors in Bs(0)→J/ψf0(980) with respect to B(0)→J/ψf0(500) decays to be 0.99(-0.04)(+0.13) at a four-momentum transfer squared equal to the mass of the J/ψ meson squared. In the case where these light mesons are considered to be quark-antiquark states, we give a determination of the mixing angle between strange and light quark states of less than 29° at 90% confidence level. We also discuss the use of a similar ratio to investigate the structure of other isospin singlet states.
我们研究了 B(0) 和 Bs(0) 介子衰变为 J/ψ 加上一个轻标量介子，分别是 f0(500)(σ) 或 f0(980)。我们表明，通过测量特定的衰变率比值，可以区分标量的夸克内容是夸克-反夸克还是四夸克。利用当前的数据，我们确定了 Bs(0)→J/ψf0(980)相对于 B(0)→J/ψf0(500)衰变的形状因子比为 0.99(-0.04)(+0.13)，在动量转移平方等于 J/ψ 介子平方质量的情况下。在这些轻介子被认为是夸克-反夸克态的情况下，我们在 90%置信水平下给出了奇异和轻夸克态之间混合角小于 29°的确定值。我们还讨论了使用类似的比值来研究其他同位旋单态的结构。
