论文标题
衰减过程中的三角机制$ b_0 \ to j/ψk^0 f_0（980）（a_0（980））$
Triangle mechanism in the decay process $B_0 \to J/ψK^0 f_0(980)(a_0(980))$
论文作者
论文摘要
三角形机制在衰减过程中的作用$ b_0 \ to j/ψk^0f_0 \ to j/ψk^0π^0π^+π^ - $和$ b_0 \ tojψk^0a_0 \ to j/ψk^0π^0η$。 In these process, the triangle singularity appears from the decay of $B^0$ into $J/ψϕK^0$ then $ϕ$ decays into $K^0\bar{K^0}$ and $K^0\bar{K^0}$ merged into $f_0$ or $a_0$ which finally decay into $π^+π^-$ and $π^0η$ respectively.我们发现，这种机制导致$ m _ {\ rm inv}（k^0f_0（a_0））\ of1520 \ {\ rm mev} $，导致三角形奇异性，并给出均匀的分支分支$ {\ rm {br}}（br}}}（b_0 j/ψk^0π^+π^ - ）= 1.38 \ times10^{ - 6} $和$ {\ rm {br}}（b_0 \ to j/ψk^0a_0 \ to j/ψk^0ak^0π^0π^0η）这种潜在的调查可以帮助我们获取标量介子$ f_0（980）$或$ a_0（980）$的信息。
The role of the triangle mechanism in the decay process $B_0\to J/ψK^0f_0 \to J/ψK^0π^+π^-$ and $B_0\to JψK^0a_0\to J/ψK^0 π^0η$ is probed. In these process, the triangle singularity appears from the decay of $B^0$ into $J/ψϕK^0$ then $ϕ$ decays into $K^0\bar{K^0}$ and $K^0\bar{K^0}$ merged into $f_0$ or $a_0$ which finally decay into $π^+π^-$ and $π^0η$ respectively. We find that this mechanism leads to a triangle singularity around $M_{\rm inv}(K^0f_0(a_0))\approx1520\ {\rm MeV}$, and gives sizable branching fractions ${\rm{Br}}(B_0\to J/ψK^0f_0\to J/ψK^0π^+π^-)=1.38\times10^{-6}$ and $ {\rm{Br}}(B_0\to J/ψK^0a_0\to J/ψK^0π^0η)=2.56\times10^{-7}$. This potential investigation can help us obtain the information of the scalar meson $f_0(980)$ or $a_0(980)$.
