# Calculation of the \(B\rightarrow K_{0,2}^*(1430)f_0(980)/\sigma \) decays in the perturbative QCD approach

## Abstract

Motivated by the observations of the decays \(B^0 \rightarrow K_0^{*}(1430)^0 f_0(980)\) and \( B^0 \rightarrow K_2^{*}(1430)^0 f_0(980)\) from BaBar collaboration, we study the \(B^{0(+)} \rightarrow K_{0,2}^{*}(1430)^{0(+)} f_0(980)/\sigma \) decays in the perturbative QCD approach for the first time. In the absence of reliable nonperturbative wave functions we only assume the scalar meson \(f_0(980)\) and \(\sigma \) are two-quark ground states. In our calculations, these decays are all dominated by the hard-scattering emission and annihilation diagrams, while the factorizable emission diagrams are forbidden or suppressed heavily by the vector decay constants. Furthermore, the branching fractions are sensitive to the mixing between \(f_0(980)\) and \(\sigma \). Comparing our results with the experimental data, a large mixing angle \(\theta \) is favored. Taking \(\theta =145^\circ \), the orders of branching fractions of \(B \rightarrow K_0^{*}(1430)^0 \sigma \), \(B \rightarrow K_{2}^{*}(1430)^0 \sigma \) and \(B \rightarrow K_{0,2}^{*}(1430)^0 f_0(980)\) are predicted to be \(10^{-4}\), \(10^{-5}\) and \(10^{-6}\), respectively, which can be measured in the current experiments such as LHCb and Belle-2. In addition, although these decays are penguin dominant, the mixing also leads to large direct *CP* asymmetries in these decays. With the precise data in future, our results could shed light on the inner structure of the scalar mesons and can be used to determine the mixing angle of the \(\sigma -f_0(980)\) system.

## 1 Introduction

The rare *B* meson decays have been viewed as an important place for testing the standard model [1] and searching for the possible effects of new physics beyond the standard model [2]. In past few years, much attentions had been paid on the \(B\rightarrow PP, PV\) and *VV* decays, where *P* and *V* are pseudoscalar and vector mesons. With the development of high energy and high luminosity experiments, the studies of *B* decays with scalar, axial vector and tensor particles became available.

In 2002, the decay \(B\rightarrow f_0(980)K\) with large branching fraction was firstly observed in Belle experiment [3], and was confirmed subsequently by BaBar [4] in 2004. Since then, more and more *B* decays involving a light scalar meson in final states have been observed in both Belle [5, 6, 7, 8], BaBar [9, 10, 11, 12, 13, 14, 15, 16] and LHCb [17, 18, 19] experiments, which provided us another perspective for the study of the scalar mesons, since their underlying structure have not been established well by studying their decays. In the theoretical side, it is well accepted by most of us that the scalar below or near 1 GeV including \(\sigma \), \(\kappa \), \(a_0(980)\) and \(f_0(980)\), form one SU(3)nonet, while the \(a_0(1450)\), \(K_0^*(1430)\), \(f_0(1370)\), and \(f_0(1500)/f_0(1710)\) with the mass above 1 GeV are grouped into another SU(3) nonet, though there is controversy around this classification. The following question is how to understand and differentiate these two nonets. For this purpose, on the basis of answering which nonet is the lowest two-quark states, two scenarios have been proposed [20, 21]. In the first scenario (S1), the mesons below or near 1 GeV are treated as the lowest \(q{\bar{q}}\) bound states, and those above 1 GeV are the first excited two-quark states. On the contrary, in the another scenario (S2), the mesons near 1.5 GeV are viewed as the ground two-quark states, while the lighter mesons are identified as the predominant \(qq{\bar{q}}{\bar{q}}\) states with a possible mixing with glueball states. For instance, \(f_0(980)\) is the lowest two-quark state in S1, while it is a four-quark state in S2. Similarly, the heavy scalar \(K_0^*(1430)\) is the excited two quark state in S1, and in S2 it is viewed as the ground state. Of course, each scenario has its own physical picture. Taking *B* decays with \(f_0(980)\) as an example, in S2 the light energetic \(f_0(980)\) dominated by four-quark configuration requires to pick up the energetic quark–antiquark pair to form a fast four-quark state, which means that a wave function describing the interactions among four quarks are needed in the theoretical calculations [22]. However, the reliable four-quark wave functions of scalar mesons are still absent till now. Therefore, we will study some particular decays in the two-quark assumption in this work. By comparing to experimental data, we hope that our results based on two-quark picture could shed light on the inner structure and characters of the scalar mesons.

^{1}is the heaviest and the \(\sigma \) is the lightest one, the ideal mixing is usually adopted, and is also supported by the measurements of \(D_s^+ \rightarrow f_0\pi \) and \(\phi \rightarrow f_0\gamma \), which illustrates that the \(f_0\) is the pure \(s{\bar{s}}\) state. However, the observed relation \(\Gamma (J/\psi \rightarrow f_0\omega ) \simeq \frac{1}{2}\Gamma (J/\psi \rightarrow f_0\phi )\) [23] implies that \(f_0\) has \(u{{\bar{u}}}\) and \(d{{\bar{d}}}\) components. Moreover, the width of \(f_0\) is dominated by the \(\pi \pi \) mode, which is very similar to the case of \(a_0(980)\). All the above phenomena suggest that in two-quark picture the \(\sigma \) and \(f_0\) should be the mixing states of \(n {{\bar{n}}}\) and \(s{{\bar{s}}}\) with \(n{\bar{n}}=\frac{1}{\sqrt{2}}(u{\bar{u}}+d{\bar{d}})\), and the mixing matrix can be defined as

*KK*the authors obtained the mixing angle to be \((25.1\pm 0.5)^{\circ } \bigcup (164.3\pm 0.2)^{\circ }\) with data [26, 27, 28], and \((42.3_{-5.5}^{+8.3})^{\circ } \bigcup (158\pm 2)^{\circ }\) with data [29]. In addition, the phenomenological analysis of the radiative decay \(\phi \rightarrow f_0\gamma \) and \(f_0\rightarrow \gamma \gamma \) implied that the obtuse angle \(\theta =(138\pm 6)^{\circ }\) is more preferred. More detailed discussions about the mixing angle can be found in Ref. [25]. In short, it is still not clear whether there exists a universal mixing angle \(\theta \) which accommodates simultaneously to all the experimental measurements. Conservatively, we set the mixing angle to be a free parameter in this work.

In 2012, BaBar collaboration reported their measurements on the decays \(B^0 \rightarrow K_0^{*}(1430)^0 f_0(980)\) and \(B^0 \rightarrow K_2^{*}(1430)^0 f_0(980)\) [30]. It is only the scalar mesons and the tensor mesons that are involved in these decays, which are special in contrast to other decays with the pseudoscalar or the vector meson. When one scalar meson is produced in *B* decays, its vector decay constant is about zero due to the conjugation invariance, and small values are caused by the violation of the SU(3) symmetry. Meanwhile, in terms of the lorentz invariance, the tensor meson cannot be produced through the \((V\pm A)\) and \((S\pm P)\) currents. Therefore, this kind of decays are highly suppressed or forbidden in naive factorization. So, in order to calculate these decays reliably, we should go beyond the naive factorization and evaluate the contributions from the nonfactorizable and annihilation type diagrams. In the past few years, the decays involving a scalar meson or a tensor meson in final states have been already explored in different approaches, such as the generalized factorization approach [31], QCD factorization (QCDF) [22, 32, 33, 34, 35, 36, 37, 38] and perturbative QCD approach (PQCD) [39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57]. Based on the researching achievements of processes, and stimulated by the experimental data, in this work ,we shall extend our studies to the \(B^{0(+)} \rightarrow K_0^{*0(+)}f_0/\sigma \) and \(B^{0(+)} \rightarrow K_2^{*0(+)}f_0/\sigma \) decays in PQCD approach, and try to provide new understanding to the mixing angle of the \(\sigma -f_0\) mixing.

The outline of the present paper is as follows. In Sect. 2, we introduce the formalism of the PQCD approach and the input quantities relevant to this work, such as the decay constants and the wave functions with the light-cone distribution amplitudes. We will apply the PQCD factorization to study the \(B^{0(+)} \rightarrow K_0^{*0(+)} f_0/\sigma \) and \(B^{0(+)} \rightarrow K_2^{*0(+)} f_0/\sigma \) decays and present the analytic formulas of the decay amplitudes in Sect. 3. The numerical results and the detailed discussions will be given in Sect. 4, and we will summarize this work in the last section.

## 2 Formalism and wave function

In the *B* meson rest framework, because the *B* meson is a heavy particle, the two daughter particles are energetic with large momenta and move fast. Because the light spectator quark in the *B* meson is soft, so in order to form an energetic final state, a hard gluon is needed to kick the soft spectator quark into a collinear one. As a result, the hard kernel is a six-quark interaction. The intrinsic character of the PQCD approach is keeping the transverse momentum \(k_T\) of the valence quarks of the hadrons in the initial and final states. After that, the end-point singularity in the amplitudes will be killed naturally. Moreover, the kept transverse momenta will introduce the additional energy scale, which will lead to the double logarithms in the QCD corrections. Within the resummation technology, these double logarithms will be resumed into the so-called Sudakov form factor, which can effectively suppress the contributions from long distance.

*B*meson decays, and the factorization is usually adopted. In particular, when the scale is higher than the

*W*boson mass (\(m_W\)), the physics can be calculated perturbatively and get the Wilson coefficients \(C(m_W)\) at the scale \(m_W\). Using the renormalization group, we can get the Wilson coefficients containing the physics between the scale \(m_W\) and the

*b*-quark mass scale (\(m_b\)). The physics between the scale \(m_b\) and the factorization scale

*t*can be calculated perturbatively and included in the so-called hard kernel in the PQCD approach. Finally, the physics below the scale

*t*is soft and nonperturbative, which can be parameterized into the universal hadronic wave functions of the initial and final states. In this way, the decay amplitude in the PQCD approach can be written as the convolution of the Wilson coefficients

*C*(

*t*), the hard kernel \(H(x_i,b_i,t)\), and the initial and final hadronic wave functions [58, 59]:

*b*region [60, 61, 62, 63]. The mode-dependent hard kernel \(H(x_i,b_i,t)\) and the relevant effective Hamiltonian \({\mathcal {H}}_{eff}\) are similar to \(B\rightarrow PP,VV\) decays, which have been discussed in detail, for example, in Refs. [64, 65].

*B*meson, as a heavy-light system, after neglecting the numerically suppressed lorentz structure, its wave function can be defined aswith \(P_B\) denoting the momentum of

*B*meson. \(\phi _B(x_1,b_1)\) is the light-cone distribution amplitude (LCDA) and can be defined as

*B*meson. As usual, for the shape parameter \(\omega \) in the LCDA and the \(f_B\), we take \(\omega =(0.4\pm 0.04)\mathrm GeV\), and \(f_B=(0.19\pm 0.02)\mathrm GeV\) [60, 64, 65].

*B*decays with one tensor meson [34, 35]. In this case, the wave function of the tensor meson is very similar to the vector meson, and can be defined aswith \(\varepsilon ^{0123}=1\). The reduced polarization vector \(\epsilon _{\bullet \mu }\) can be expressed as \(\epsilon _{\bullet \mu }=\frac{\epsilon _{\mu \nu }v^{\nu }}{P\cdot v}\), where the \(\epsilon _{\mu \nu }\) is the polarization tensor of the tensor meson. The expressions of the twist-2 and twist-3 LCDAs are given as

## 3 Perturbative calculation

- current–current (tree) operators$$\begin{aligned} O_{1}= & {} ({{\bar{u}}}_{\alpha }b_{\beta } )_{V-A} ({{\bar{s}}}_{\beta } u_{\alpha })_{V-A}, \ \ \ \ \ \ \ \ \nonumber \\ O_{2}= & {} ({{\bar{u}}}_{\alpha }b_{\alpha })_{V-A} ({{\bar{s}}}_{\beta } u_{\beta } )_{V-A}, \end{aligned}$$(16)
- QCD penguin operators$$\begin{aligned} O_{3}= & {} ({{\bar{s}}}_{\alpha }b_{\alpha })_{V-A}\sum \limits _{q^{\prime }} ({{\bar{q}}}^{\prime }_{\beta } q^{\prime }_{\beta } )_{V-A}, \ \ \ \ \ \nonumber \\ O_{4}= & {} ({{\bar{s}}}_{\beta } b_{\alpha })_{V-A}\sum \limits _{q^{\prime }} ({{\bar{q}}}^{\prime }_{\alpha }q^{\prime }_{\beta } )_{V-A}, \end{aligned}$$(17)$$\begin{aligned} O_{5}= & {} ({{\bar{s}}}_{\alpha }b_{\alpha })_{V-A}\sum \limits _{q^{\prime }} ({{\bar{q}}}^{\prime }_{\beta } q^{\prime }_{\beta } )_{V+A}, \ \ \ \ \ \ \ \ \ \nonumber \\ O_{6}= & {} ({{\bar{s}}}_{\beta } b_{\alpha })_{V-A}\sum \limits _{q^{\prime }} ({{\bar{q}}}^{\prime }_{\alpha }q^{\prime }_{\beta } )_{V+A}, \end{aligned}$$(18)
- electro-weak penguin operators$$\begin{aligned} O_{7}= & {} \frac{3}{2}({{\bar{s}}}_{\alpha }b_{\alpha })_{V-A} \sum \limits _{q^{\prime }}e_{q^{\prime }} ({{\bar{q}}}^{\prime }_{\beta } q^{\prime }_{\beta } )_{V+A}, \ \ \ \ \nonumber \\ O_{8}= & {} \frac{3}{2}({{\bar{s}}}_{\beta } b_{\alpha })_{V-A} \sum \limits _{q^{\prime }}e_{q^{\prime }} ({{\bar{q}}}^{\prime }_{\alpha }q^{\prime }_{\beta } )_{V+A}, \end{aligned}$$(19)$$\begin{aligned} O_{9}= & {} \frac{3}{2}({{\bar{s}}}_{\alpha }b_{\alpha })_{V-A} \sum \limits _{q^{\prime }}e_{q^{\prime }} ({{\bar{q}}}^{\prime }_{\beta } q^{\prime }_{\beta } )_{V-A}, \ \ \ \ \nonumber \\ O_{10}= & {} \frac{3}{2}({{\bar{s}}}_{\beta } b_{\alpha })_{V-A} \sum \limits _{q^{\prime }}e_{q^{\prime }} ({{\bar{q}}}^{\prime }_{\alpha }q^{\prime }_{\beta } )_{V-A}, \end{aligned}$$(20)

*B*decay with two scalar mesons, while another is

*B*decay involving a tensor meson and a scalar meson. In the decay amplitudes, the subscripts

*SS*and

*TS*represent different types, respectively. According to the effective Hamiltonian (15), we can draw the lowest order diagrams of decays we concerned, and the diagrams of decay \(B \rightarrow K^{*0}_{0} f_0/\sigma \) are shown in Fig. 1 as an example. These Feynman diagrams can be categorized into two classes based on the typological structures: the emission diagrams (a, b, c and d), in which the light quark in

*B*meson enter one of the light mesons as a spectator, and the annihilation diagrams (e, f, g and h), in which both of the two quarks in

*B*meson are involved in the operators. In PQCD approach, for each diagram with different operator, the whole amplitude is expressed as the convolution of the hard kernel, the related hard function, and the wave functions of involved mesons.

*S*” in the subscripts indicates that the scalar meson is emitted. The superscript “

*LL*” means the \((V-A)(V-A)\) current. The expressions of the related hard functions \(E_{ef}\), \(h_{ef}\), and the scale

*t*are the same as those in \(B\rightarrow VV\) decays, which can be found in the Appendix of Ref. [65]. The \((V-A)(V+A)\) current cannot contribute to the decays we considered, so we do not include it here. When the \((S-P)(S + P)\) current, that is arising from the Fierz transformation of \((V-A)(V+A)\) current, is inserted, the amplitudes can be read as

- \((V-A)(V-A)\)$$\begin{aligned} {\mathcal {M}}_{SS,S}^{LL}= & {} -16\sqrt{\frac{2}{3}}C_F\pi m_B^4\int _0^1dx_1dx_2dx_3\nonumber \\&\times \int _0^{\infty }b_1db_1b_2db_2\phi _B(x_1,b_1)\phi _{S2}(x_2) \nonumber \\&\times \Bigg \{\Big [\phi _{S3}(x_3)(x_2-1)+r_3x_3(\phi _{S3}^s(x_3)-\phi _{S3}^t(x_3))\Big ]\nonumber \\&\times E_{enf}(t_c)h_{enf}[\alpha ,\beta _1,b_1,b_2] \nonumber \\&+\Big [\phi _{S3}(x_3)(x_2+x_3)-r_3x_3(\phi _{S3}^s(x_3)\nonumber \\&+\phi _{S3}^t(x_3))\Big ] E_{enf}(t_d)h_{enf}[\alpha ,\beta _2,b_1,b_2]\Bigg \}, \end{aligned}$$(27)$$\begin{aligned} {\mathcal {M}}_{TS,S}^{LL}= & {} \sqrt{\frac{2}{3}}{\mathcal {M}}_{SS,S}^{LL}\mid \phi _{S3}^{(s,t)}(x_3)\rightarrow \phi _T^{(s,t)}(x_3), \end{aligned}$$(28)$$\begin{aligned} {\mathcal {M}}_{TS,T}^{LL}= & {} \sqrt{\frac{2}{3}}{\mathcal {M}}_{SS,S}^{LL}\mid \phi _{S2}(x_2)\rightarrow \phi _T(x_2). \end{aligned}$$(29)
- \((V-A)(V+A)\)$$\begin{aligned} {\mathcal {M}}_{SS,S}^{LR}= & {} 16\sqrt{\frac{2}{3}}C_F\pi r_2m_B^4\int _0^1dx_1dx_2dx_3\nonumber \\&\times \int _0^{\infty }b_1db_1b2db_2\phi _B(x_1,b_1)\nonumber \\&\times \Bigg \{\Big [(x_2-1)\phi _{S3}(x_3)(\phi _{S2}^s(x_2)+\phi _{S2}^t(x_2))\nonumber \\&+r_3\Big ((1-x_2+x_3)(\phi _{S2}^t(x_2)\phi _{S3}^t(x_3)\nonumber \\&-\phi _{S2}^s(x_2)\phi _{S3}^s(x_3))\nonumber \\&+(x_2+x_3-1)(\phi _{S2}^t(x_2)\phi _{S3}^s(x_3)\nonumber \\&-\phi _{S2}^s(x_2)\phi _{S3}^t(x_3))\Big )\Big ]\nonumber \\&\times E_{enf}(t_c)h_{enf}[\alpha ,\beta _1,b_1,b_2]\nonumber \\&+\Big [x_2\phi _{S3}(x_3)(\phi _{S2}^s(x_2)-\phi _{S2}^t(x_2))\nonumber \\&+r_3\Big ((x_3-x_2)(\phi _{S2}^s(x_2)\phi _{S3}^t(x_3)\nonumber \\&+\phi _{S2}^t(x_2)\phi _{S3}^s(x_3))\nonumber \\&+(x_2+x_3)(\phi _{S2}^s(x_2)\phi _{S3}^s(x_3)\nonumber \\&+\phi _{S2}^t(x_2)\phi _{S3}^t(x_3)\Big )\Big ]\nonumber \\&\times E_{enf}(t_d)h_{enf}[\alpha ,\beta _2,b_1,b_2]\Bigg \}, \end{aligned}$$(30)$$\begin{aligned} {\mathcal {M}}_{TS,S}^{LR}= & {} \sqrt{\frac{2}{3}}{\mathcal {M}}_{SS,S}^{LR}\mid \phi _{S3}^{(s,t)}(x_3)\rightarrow \phi _T^{(s,t)}(x_3), \end{aligned}$$(31)$$\begin{aligned} {\mathcal {M}}_{TS,T}^{LR}= & {} \sqrt{\frac{2}{3}}{\mathcal {M}}_{SS,S}^{LR}\mid \phi _{S2}^{(s,t)}(x_2)\rightarrow \phi _T^{(s,t)}(x_2), \end{aligned}$$(32)
- \((S-P)(S+P)\)$$\begin{aligned} {\mathcal {M}}_{SS,S}^{SP}= & {} -16\sqrt{\frac{2}{3}}C_F\pi m_B^4\int _0^1dx_1dx_2dx_3\nonumber \\&\times \int _0^{\infty }b_1db_1b_2db_2\phi _B(x_1,b_1)\phi _{S2}(x_2)\nonumber \\&\times \Bigg \{\Big [\phi _{S3}(x_3)(-1+x_2-x_3)+r_3x_3(\phi _{S3}^s(x_3)\nonumber \\&+\phi _{S3}^t(x_3))\Big ]\nonumber \\&\times E_{enf}(t_c)h_{enf}[\alpha ,\beta _1,b_1,b_2] \nonumber \\&+\Big [\phi _{S3}(x_3)x_2+r_3x_3(\phi _{S3}^t(x_3)-\phi _{S3}^s(x_3))]\nonumber \\&\times E_{enf}(t_d)h_{enf}[\alpha ,\beta _2,b_1,b_2]\Bigg \}, \end{aligned}$$(33)$$\begin{aligned} {\mathcal {M}}_{TS,S}^{SP}= & {} \sqrt{\frac{2}{3}}{\mathcal {M}}_{SS,S}^{SP}\mid \phi _{S3}^{(s,t)}(x_3)\rightarrow \phi _T^{(s,t)}(x_3), \end{aligned}$$(34)$$\begin{aligned} {\mathcal {M}}_{TS,T}^{SP}= & {} \sqrt{\frac{2}{3}}{\mathcal {M}}_{SS,S}^{SP}\mid \phi _{S2}(x_2)\rightarrow \phi _T(x_2). \end{aligned}$$(35)

*B*meson are involved the four-quark interaction and \(q{{\bar{q}}}\) quarks included in final states are produced from a hard gluon. In Fig. 1, the diagrams (e and f) in third row are the so-called factorizable annihilation type diagrams, whose decay amplitudes can be calculated as follow:

- \((V-A)(V\pm A)\) current$$\begin{aligned} {\mathcal {A}}_{SS,S}^{LL(LR)}= & {} 8C_F f_B\pi m_B^4\int _0^1dx_2dx_3\int _0^{\infty }b_2db_2b_3db_3\nonumber \\&\times \Bigg \{\Big [(x_3-1)\phi _{S2}(x_2)\phi _{S3}(x_3)\nonumber \\&+2r_2r_3\phi _{S2}^s(x_2)(\phi _{S3}^s(x_3)(x_3-2)+\phi _{S3}^t(x_3)x_3)\Big ]\nonumber \\&\times E_{af}(t_e)h_{af}[\alpha _1,\beta ,b_2,b_3]\nonumber \\&+\Big [-2r_2r_3\phi _{S3}^s(x_3)(\phi _{S2}^s(x_2)(1+x_2)\nonumber \\&+\phi _{S2}^t(x_2)(x_2-1))+x_2\phi _{S2}(x_2)\phi _{S3}(x_3)\Big ]\nonumber \\&\times E_{af}(t_f)h_{af}[\alpha _2,\beta ,b_2,b_3]\Bigg \}, \end{aligned}$$(36)$$\begin{aligned} {\mathcal {A}}_{TS,S}^{LL(LR)}= & {} \sqrt{\frac{2}{3}}{\mathcal {A}}_{SS,S}^{LL(LR)}|\phi _{S3}^{(s,t)}(x_3)\rightarrow \phi _T^{(s,t)}(x_3), \end{aligned}$$(37)$$\begin{aligned} {\mathcal {A}}_{TS,T}^{LL(LR)}= & {} \sqrt{\frac{2}{3}}{\mathcal {A}}_{SS,S}^{LL(LR)}|\phi _{S2}^{(s,t)}(x_2)\rightarrow \phi _T^{(s,t)}(x_2), \end{aligned}$$(38)
- \((S-P)(S+P)\) current$$\begin{aligned} {\mathcal {A}}_{SS,S}^{SP}= & {} -16C_Ff_B\pi m_B^4\int _0^1dx_2dx_3\int _0^{\infty }b_2db_2b_3db_3\nonumber \\&\times \Bigg \{\Big [2 r_2 \phi _{S3}(x_3)\phi _{S2}^s(x_2)\nonumber \\&+r_3(x_3-1)\phi _{S2}(x_2)(\phi _{S3}^s(x_3)+\phi _{S3}^t(x_3))\Big ]\nonumber \\&\times E_{af}(t_e)h_{af}[\alpha _1,\beta ,b_2,b_3]\nonumber \\&-\Big [2r_3\phi _{S2}(x_2)\phi _{S3}^s(x_3)+r_2x_2\phi _{S3}(x_3)(\phi _{S2}^t(x_2)\nonumber \\&-\phi _{S2}^s(x_2))\Big ] E_{af}(t_f)h_{af}[\alpha _2,\beta ,b_2,b_3]\Bigg \}, \end{aligned}$$(39)$$\begin{aligned} {\mathcal {A}}_{TS,S}^{SP}= & {} \sqrt{\frac{2}{3}}{\mathcal {A}}_{SS,S}^{SP}|\phi _{S3}^{(s,t)}(x_3)\rightarrow \phi _T^{(s,t)}(x_3), \end{aligned}$$(40)$$\begin{aligned} {\mathcal {A}}_{TS,T}^{SP}= & {} \sqrt{\frac{2}{3}}{\mathcal {A}}_{SS,S}^{SP}|\phi _{S2}^{(s,t)}(x_2)\rightarrow \phi _T^{(s,t)}(x_2). \end{aligned}$$(41)

- \((V-A)(V-A)\)$$\begin{aligned} {\mathcal {W}}_{SS,S}^{LL}= & {} 16\sqrt{\frac{2}{3}}C_F \pi m_B^4 \int _0^1dx_1dx_2dx_3\nonumber \\&\times \int _0^{\infty }b_1db_1b_2db_2\phi _B(x_1,b_1) \nonumber \\&\times \Bigg \{\Big [-\phi _{S2}(x_2)\phi _{S3}(x_3)x_2\nonumber \\&+r_2r_3\Big (\phi _{S2}^t(x_2)(\phi _{S3}^t(x_3)(1-x_2+x_3)\nonumber \\&+\phi _{S3}^s(x_3)(x_2+x_3-1)) \nonumber \\&+\phi _{S2}^s(x_2)(\phi _{S3}^t(x_3)(1-x_2-x_3)\nonumber \\&+\phi _{S3}^s(x_3)(3+x_2-x_3))\Big )\Big ]\nonumber \\&\times E_{anf}(t_g)h_{anf}[\alpha ,\beta _1,b_1,b_2] \nonumber \\&-\Big [\phi _{S2}(x_2)\phi _{S3}(x_3)(x_3-1)\nonumber \\&+r_2r_3\Big (\phi _{S2}^s(x_2)(\phi _{S3}^s(x_3)(1+x_2-x_3)\nonumber \\&-\phi _{S3}^t(x_3)(1-x_2-x_3)) \nonumber \\&+\phi _{S2}^t(x_2)(\phi _{S3}^s(x_3)(1-x_2-x_3)\nonumber \\&-\phi _{S3}^t(x_3)(1+x_2-x_3))\Big )\Big ]\nonumber \\&E_{anf}(t_h)h_{anf}[\alpha ,\beta _2,b_1,b_2]\Bigg \}, \end{aligned}$$(42)$$\begin{aligned} {\mathcal {W}}_{TS,S}^{LL}= & {} \sqrt{\frac{2}{3}}{\mathcal {W}}_{SS,S}^{LL}|\phi _{S3}^{(s,t)}(x_3)\rightarrow \phi _T^{(s,t)}(x_3), \end{aligned}$$(43)$$\begin{aligned} {\mathcal {W}}_{TS,T}^{LL}= & {} \sqrt{\frac{2}{3}}{\mathcal {W}}_{SS,S}^{LL}|\phi _{S2}^{(s,t)}(x_2)\rightarrow \phi _T^{(s,t)}(x_2), \end{aligned}$$(44)
- \((V-A)(V+A)\)$$\begin{aligned} {\mathcal {W}}_{SS,S}^{LR}= & {} 16\sqrt{\frac{2}{3}}C_F \pi m_B^4\int _0^1dx_1dx_2dx_3\nonumber \\&\times \int _0^{\infty }b_1db_1b_2db_2\phi _B(x_1,b_1) \nonumber \\&\times \Bigg \{\Big [r_2\phi _{S3}(x_3)(\phi _{S2}^s(x_2)+\phi _{S2}^t(x_2))(x_2-2)\nonumber \\&-r_3\phi _{S2}(x_2)(\phi _{S3}^s(x_3) \nonumber \\&-\phi _{S3}^t(x_3))(x_3+1)\Big ]E_{anf}(t_g)h_{anf}[\alpha ,\beta _1,b_1,b_2] \nonumber \\&+\Big [-r_2x_2\phi _{S3}(x_3)(\phi _{S2}^s(x_2)+\phi _{S2}^t(x_2))\nonumber \\&+r_3(x_3-1)\phi _{S2}(x_2)(\phi _{S3}^s(x_3) \nonumber \\&-\phi _{S3}^t(x_3))\Big ]E_{anf}(t_h)h_{anf}[\alpha ,\beta _2,b_1,b_2]\Bigg \}, \end{aligned}$$(45)$$\begin{aligned} {\mathcal {W}}_{TS,S}^{LR}= & {} {\mathcal {W}}_{SS,S}^{LR}|\phi _{S3}^{(s,t)}(x_3)\rightarrow \phi _T^{(s,t)}(x_3), \end{aligned}$$(46)$$\begin{aligned} {\mathcal {W}}_{TS,T}^{LR}= & {} {\mathcal {W}}_{SS,S}^{LR}|\phi _{S2}^{(s,t)}(x_2)\rightarrow \phi _T^{(s,t)}(x_2), \end{aligned}$$(47)
- \((S-P)(S+P)\)$$\begin{aligned} {\mathcal {W}}_{SS,S}^{SP}= & {} 16\sqrt{\frac{2}{3}}C_F\pi m_B^4\int _0^1dx_1dx_2dx_3\nonumber \\&\times \int _0^{\infty }b_1db_1b_2db_2\phi _B(x_1,b_1) \nonumber \\&\times \Bigg \{\Big [(x_3-1)\phi _{S2}(x_2)\phi _{S3}(x_3)\nonumber \\&+r_2r_3\Big (\phi _{S2}^t(x_2)(\phi _{S3}^t(x_3)(1-x_2+x_3)\nonumber \\&-\phi _{S3}^s(x_3)(x_2+x_3-1)) \nonumber \\&+\phi _{S2}^s(x_2)(\phi _{S3}^s(x_3)(3+x_2-x_3)\nonumber \\&+\phi _{S3}^t(x_3)(x_2+x_3-1))\Big )\Big ]\nonumber \\&\times E_{anf}(t_g)h_{anf}[\alpha ,\beta _1,b_1,b_2] \nonumber \\&+\Big [x_2\phi _{S2}(x_2)\phi _{S3}(x_3)\nonumber \\&-r_2r_3\Big (\phi _{S2}^s(x_2)(\phi _{S3}^s(x_3)(1+x_2-x_3)\nonumber \\&+\phi _{S3}^t(x_3)(1-x_2-x_3)) \nonumber \\&+\phi _{S2}^t(x_2)(\phi _{S3}^t(x_3)(-1-x_2+x_3)\nonumber \\&+\phi _{S3}^s(x_3)(x_2+x_3-1))\Big )\Big ]\nonumber \\&\times E_{anf}(t_h)h_{anf}[\alpha ,\beta _2,b_1,b_2]\Bigg \}, \end{aligned}$$(48)$$\begin{aligned} {\mathcal {W}}_{TS,S}^{SP}= & {} \sqrt{\frac{2}{3}}{\mathcal {W}}_{SS,S}^{SP}|\phi _{S3}^{(s,t)}(x_3)\rightarrow \phi _T^{(s,t)}(x_3), \end{aligned}$$(49)$$\begin{aligned} {\mathcal {W}}_{TS,T}^{SP}= & {} \sqrt{\frac{2}{3}}{\mathcal {W}}_{SS,S}^{SP}|\phi _{S2}^{(s,t)}(x_2)\rightarrow \phi _T^{(s,t)}(x_2). \end{aligned}$$(50)

*B*decays [60, 61, 62, 63, 64].

## 4 Numerical results and discussions

*B*meson and the lifetimes of the

*B*mesons (in \(\mathrm ps\)) are adopted as follows [23]:

*t*” and QCD scale \(\Lambda _{\mathrm{QCD}}\), characterized by \(0.8t\sim t\sim 1.2t\) and \(\Lambda _{\mathrm{QCD}}=(0.25\pm 0.05)\) GeV. In fact, these errors reflect the contributions of the next-to-leading order radiative corrections and the next-to-leading order power corrections, since the complete next-to-leading order corrections in PQCD approach have not been accomplished [71, 72] till now. The last errors are from the uncertainties of the unitary angle \(\gamma \). We combine all uncertainties together and give the bounds as shown in the figures.

*B*decays \(B_{(s)} \rightarrow {\overline{D}}^0 f_0\). The authors in [74] obtained the mixing angle \(\theta \sim 146^{\circ }\) by analyzing the charmonium decays \(B_s\rightarrow J/\psi f_0(\sigma )\). If the \(f_0\) is composed entirely of \(s{\bar{s}}\) component, which indicates \(\theta = 0^{\circ }\), the branching fractions of \(B^0\rightarrow K_0^{*0}f_0\) and \(B^0\rightarrow K_2^{*0}f_0\) are about \(1.0\times 10^{-4}\) and \(3.0\times 10^{-5}\), respectively, both of which are much larger than the data provided by the BaBar collaboration. When the mixing is taken in account and assuming the mixing angle less than \(90^{\circ }\), we find that the contributions from the component \(n{\bar{n}}=(u{\bar{u}}+d{\bar{d}})/\sqrt{2}\) and \(s{\bar{s}}\) have the same sign. Furthermore, due to the constructive interference between the two different type amplitudes from the two components, the branching fractions would be enhanced and overshoot the upper limit of the experimental data, which implies that the acute angle \(\theta \) is unfavored. Conversely, if the angle \(\theta >90^{\circ }\), the branching fractions of \(B^0\rightarrow K_{0(2)}^{*0}f_0\) will be suppressed by the cancellation between these two amplitudes from \(n{\bar{n}}\) and \(s{\bar{s}}\) components, and the theoretical predictions of PQCD approach will accommodate the experimental data well.

Lastly, we will discuss the relations between the direct CP asymmetries and the mixing angle. As we already known, both strong and weak phases are the necessary conditions for direct CP asymmetry. These decays concerned in this work are all governed by the \(b\rightarrow s\) transition, and are dominated by the penguin operators, because the contributions from the tree operators are either forbidden or suppressed by small CKM matrix elements \(|V_{us}V_{ub}|\). In the naive 2-quark model with the ideal mixing, the decay \(B^0\rightarrow K_0^{*0}f_0\) and \(B^0\rightarrow K_2^{*0}f_0\) are both induced by \(b\rightarrow ss{{\bar{s}}}\) transition, which is a pure penguin process. In the Wolfenstein parameterization of CKM matrix, there is no weak phase in this transition, so the direct CP asymmetries of these two decays are zero. For \(B^0\rightarrow K_0^{*0}\sigma \) and \(B^0\rightarrow K_2^{*0}\sigma \) that are induced by \(b\rightarrow sq{{\bar{q}}}\) (\(q=u,d\)), their direct CP asymmetries decay are less than \(5\%\), because \(|V_{us}V_{ub}| \ll |V_{ts}V_{ub}|\). Since the mixing is supported by many experimental measurements and taken into account in this work, these considered decays receive three distinct types of contributions: the first one from the diagrams with emitted \(K_{0(2)}^{*0(+)}\), the second one from the \(f_0/\sigma \) emission with \(q{\bar{q}}\) component and the last one from the \(f_0/\sigma \) with \(s{\bar{s}}\) component. Similar to the branching fractions, these CP asymmetries are also related to the mixing angle \(\theta \). We plot the CP asymmetries of these decays with the changes of the mixing angle \(\theta \), as shown in Figs. 4 and 5. When the mixing angle \(\theta \) is involved, the \(q{\bar{q}}\) component contributes to all concerned decays within the tree operators, which can cancel the penguin contributions from \(s{\bar{s}}\) component when the mixing angle \(\theta >90^{\circ }\). For instance, when the angle \(\theta = 145^{\circ }\), the CP asymmetry of the \(B^0\rightarrow K_0^{*0}f_0\) can be as large as \(-68\%\). As for the \(B^0\rightarrow K_{0(2)}^{*0}\sigma \) decays, the interference between \(q\bar{q}\) and \(s{{\bar{s}}}\) is contrary to corresponding decays with \(f_0\). For the isospin asymmetry, we note that the interference for the considered \(B^+\) decays are similar to the corresponding \(B^0\) decays respectively, and \(20\%\) differences can be attributed to the effects of tree operators in the annihilation diagrams, which can be found form the Figs. 4 and 5. Because the direct CP asymmetry is a ratio, the theoretical uncertainties from the nonperturbative parameters will be cancelled, and the errors of these asymmetries will decrease, as illustrated in two figures. Therefore, if the two-quark structure will be confirmed, the CP asymmetries can also be used to determine the mixing angle \(\theta \).

## 5 Summary

In this paper, it is the first time that the \(B^{0(+)}\rightarrow K_{0(2)}^{*}(1430)^{0(+)} f_0(980)(\sigma )\) decays were studied in the perturbative QCD approach under the two-quark assumption. Our theoretical results are hoped to shed light on the old puzzle about the inner structure of the scalar meson, especially the mixing angle of the \(\sigma -f_0(980)\) system. For these decays, due to the charge conjugation invariance and the lorentz invariance, the factorizable emission diagrams are forbidden or suppressed heavily by the vector decay constants of scalar mesons, and the nonfactorizale diagrams and annihilation ones play the dominant roles. Moreover, for these considered penguin dominant decays, the penguin contributions from \(n{\bar{n}}\) and \(s{\bar{s}}\) components are at the same level. Thus the interferences are remarkable and affect the branching fractions and CP asymmetries significantly, which will provide us good platforms to determine the mixing angle. After the calculations, combining the experimental results of branching fractions, we find that, for the mixing angle, the range of \([135^{\circ }, 155^{\circ }]\) is favored. When the mixing angle \(\theta =145^{\circ }\), the predicted branching ratios for \(B^{0}\rightarrow K_{0(2)}^{*}(1430)^0 f_0(980)\) decays are in agreement with the experimental data well. The future measurements of CP asymmetries in LHCb and Belle-II can further test our results. Finally, we note that our calculation are only based on the two-quark assumption. The four-quark component or \(K{\overline{K}}\) threshold effect that may be important components in \(f_0(980)\) were not included, because the reliable nonperturbative input parameters are still absent and left for future study.

## Footnotes

- 1.
For the sake of simplicity, we ignore the (980) and (1430) in the following context unless special statement.

## Notes

### Acknowledgements

This work was supported in part by the National Natural Science Foundation of China under the Grants nos. 11705159, 11575151, 11975195, 11765012, 11875033 and 11447032, and by the Natural Science Foundation of Shandong province under the Grant nos. ZR2018JL001 and ZR2019JQ04. X. Liu is also supported by by the Qing Lan Project of Jiangsu Province under Grant no. 9212218405, and by the Research Fund of Jiangsu Normal University under Grant no. HB2016004.

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