论文标题
quasi-two-body的研究$ b _ {（s）} \ to ϕ（f_0（980）/f_2（1270）\ to）ππ$在扰动QCD方法中衰减
Study of Quasi-two-body $B_{(s)}\to ϕ(f_0(980)/f_2(1270)\to)ππ$ Decays in Perturbative QCD Approach
论文作者
论文摘要
In 2017, LHCb collaboration reported their first observation of the rare decays $B_s \to ϕ(f_0(980)$ $/f_2(1270) \to ) π^+π^-$ and the evidence of $B^0 \to ϕ(f_0(980)/f_2(1270)\to)π^+π^-$.在此激励的情况下，我们研究了这些准四体衰变，以扰动QCD方法。计算分支分数，$ CP $不对称和偏振分数。我们发现，在适当的两膜波函数中，计算出的分支部分与LHCB的测量值一致。根据窄宽的近似值，我们还计算了Quasi-Two-two-two $ b_ {d，s} \至ϕ（f_0（980）/f_2（1270）/f_2（1270）\ to）π^0π^0 $ and $ b_ {d，s} \ to f_2（$ b_ to f_2（$ b_2）（$ b_2（f_0）$ f_2（$ b_2））（$ b_2（f_0）\ 2（$ b_2）（$ k^k^k^k^k^k^k^k^k^k^k^k）在正在进行的LHCB和Belle II实验中进行测试。此外，在此近似值下还分析了$ b_ {d，s} \ to ϕf_2（1270）$的过程。我们注意到，这些衰减的$ CP $不对称是很小的，因为这些衰减是企鹅占主导地位或纯企鹅的过程。
In 2017, LHCb collaboration reported their first observation of the rare decays $B_s \to ϕ(f_0(980)$ $/f_2(1270) \to ) π^+π^-$ and the evidence of $B^0 \to ϕ(f_0(980)/f_2(1270)\to)π^+π^-$. Motivated by this, we study these quasi-two-body decays in the perturbative QCD approach. The branching fractions, $CP$ asymmetries and the polarization fractions are calculated. We find that within the appropriate two-meson wave functions, the calculated branching fractions are in agreement with the measurements of LHCb. Based on the narrow-width approximation, We also calculate the branching fractions of the quasi-two-body $B_{d,s}\to ϕ(f_0(980)/f_2(1270)\to) π^0π^0$ and $B_{d,s}\to ϕ(f_2(1270)\to) K^+K^-$, and hope the predictions to be tested in the ongoing LHCb and Belle II experiments. Moreover, the processes $B_{d,s}\to ϕf_2(1270)$ are also analyzed under this approximation. We note that the $CP$ asymmetries of these decays are very small, because these decays are either penguin dominant or pure penguin processes.
