B → a ₀ (1450)ρ(ω) Decays in Perturbative QCD Approach

Abstract

In the two-quark model supposition for the meson a0(1450), which can be viewed as either the first excited state (scenario I) or the lowest lying state (scenario II), the branching ratios and the direct CP-violating asymmetries for decays B → a0(1450)ρ(ω) are studied by employing the perturbative QCD factorization approach. We find the following results: (a) For the decays B− → a00(1450)ρ− and B̄0 → a+0(1450)ρ−, their branching ratios have large difference between two scenarios. Although their branching ratios are larger than other considered decay modes, their direct CP-violating asymmetries in both scenarios are small. (b) For the decays B− → a−0(1450)ρ0 and B̄0 → a−0(1450)ρ+, a00(1450)ρ0, a00(1450)ω, their branching ratios are close to each other between two scenarios, respectively. (c) Comparing with the decays B̄0 → π0ρ0, π0π0, the decay B̄0 → a00(1450)ρ0 receives a larger branching ratio in each scenario, which is sensitive to the variation of the Cabibbo—Kobayashi—Maskawa angle α.

Revisiting charmless hadronic B decays to scalar mesons

“…Since the branching fraction of B 0 → a ± 0 (980)ρ ∓ is predicted to be large in QCDF, of order 23 × 10 −6 , a measurement of this mode may give the first observation of the a 0 (980) production in B decays. Notice that the calculated rates of B − → a 0 0 (1450)ρ − and B 0 → a + 0 (1450)ρ − in the pQCD approach [19] are unreasonably too large.…”

“…The experimental measurements of B → SP and B → SV , where S, P, V stand for scalar, vector and pseudoscalar mesons, respectively, will provide valuable information on the nature of the even-parity mesons. On the theoretical side, hadronic B decays to scalar mesons have been studied in the QCD-inspired approaches: QCD factorization (QCDF) [6][7][8][9][10] and pQCD [11][12][13][14][15][16][17][18][19][20].…”

Two-body charmed B(s) decays involving a light scalar meson

“…More and more observations about B q decays involving a scalar meson, together with the theoretical researches, will provide us further information on the inner structure of the scalar mesons. Motivated by this, the charmless B q decays involving a scalar meson have been already explored in different approaches, such as in the generalized factorization approach [11], in QCD factorization (QCDF) [4,5,[12][13][14][15], in perturbative QCD approach (PQCD) [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”