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arxiv: 2606.22505 · v1 · pith:J5D3LXFKnew · submitted 2026-06-21 · ✦ hep-ph

Study on the Cabibbo-favored {overline B}_(d,s) {to} D_(d,s)^((*)+)S⁻ weak decays in QCD factorization

Lili Chen , Chenyang Jing , Kaiyuan Gao , Shuai Xu , Mengfei Zhao This is my paper

Pith reviewed 2026-06-26 10:12 UTC · model grok-4.3

classification ✦ hep-ph
keywords Cabibbo-favored B decaysQCD factorizationbranching ratiosscalar mesonsa0(1450)K0*(1430)NLO correctionslight-front form factors
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The pith

Branching ratios for anti-B0 to D+ a0- decays reach order 10^{-4} when scalars are treated as lowest p-wave states.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper applies the QCD factorization approach, including next-to-leading-order corrections, to compute branching ratios for Cabibbo-favored anti-B_d,s decays into D or D* mesons plus scalar mesons such as a0(1450) and K0*(1430). It uses updated transition form factors obtained from a covariant light-front quark model and evaluates the amplitudes under two different scenarios for the scalar mesons. The central finding is that the a0 modes reach branching ratios of order 10^{-4} specifically in scenario two. A sympathetic reader would care because these rates lie within the sensitivity of current and near-future experiments at LHCb and SuperKEKB, offering a direct test of both the decay mechanism and the internal structure assigned to the scalars.

Core claim

Within the QCDF framework with NLO contributions and form factors from a covariant light-front quark model, the branching ratios for the decays anti-B0 to D+ a0- and anti-Bs0 to Ds+ a0- reach up to order 10^{-4} in scenario two, which assumes the scalar mesons are the lowest-lying p-wave states.

What carries the argument

QCDF decay amplitudes at NLO that incorporate hard-scattering kernels, B to D(*) transition form factors, and scalar-meson decay constants plus distribution amplitudes defined separately in two scenarios.

If this is right

  • The anti-B0 to D+ a0- and anti-Bs0 to Ds+ a0- channels become high-priority targets for searches at LHCb and SuperKEKB.
  • Branching ratios remain smaller in scenario one for the same decays.
  • The NLO corrections modify the predicted rates relative to leading-order estimates.
  • Decays involving K0*(1430) yield different numerical results depending on which scenario is adopted.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Confirmation of the 10^{-4} rates would favor the p-wave quark-antiquark assignment over other pictures of the scalars.
  • Data on these modes could be used to extract or constrain the scalar-meson distribution amplitudes directly.
  • The same QCDF setup can be applied to related non-factorizable or penguin-dominated channels to test consistency across the b to c transition.
  • Improved form-factor inputs would reduce the theoretical uncertainty on the quoted branching ratios.

Load-bearing premise

The scalar mesons are treated as lowest-lying p-wave states in scenario-2, which fixes the decay constants and distribution amplitudes inserted into the QCDF amplitude.

What would settle it

An experimental measurement or upper limit showing the branching ratio of anti-B0 to D+ a0- is well below 10^{-5} would rule out the scenario-2 prediction.

Figures

Figures reproduced from arXiv: 2606.22505 by Chenyang Jing, Kaiyuan Gao, Lili Chen, Mengfei Zhao, Shuai Xu.

Figure 1
Figure 1. Figure 1: FIG. 1: Next-to-leading-order QCD vertex corrections to the decays [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2: The transition form factors [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
read the original abstract

Motivated by recent experimental progress and theoretical developments, we investigate the Cabibbo-favored $b\to c$ governed ${\overline B}_{d,s}$ ${\to}$ $D_{d,s}^{(*)+}S^{-}$~($S$$=$$K_0^*(1430)$, $a_0(1450)$) weak decays by considering the next-to-leading (NLO) contributions within QCDF framework. With the updated values of $B_{(s)}\to D_{(s)}^{(*)}$ transition form factors obtained from a covariant light-front quark model, branching ratios are estimated in two scenarios for scalar mesons. It is found that the branching ratios for ${\overline B}^0{\to}D^{+}{a_0^-}$ and ${\overline B}_{s}^0{\to}D_{s}^{+}{a_0^-}$ decays can reach up to the order of ${\cal O}(10^{-4})$ in scenario-2 by assuming that the scalar mesons are lowest-lying p-wave states, which deserve high-priority experimental searches and may be observed in the ongoing LHCb and SuperKEKB experiments.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 3 minor

Summary. The manuscript computes branching ratios for the Cabibbo-favored decays ar B_{d,s} o D_{d,s}^{(*)+} S^- (S = K_0^*(1430), a_0(1450)) in the QCDF framework at NLO order. Form factors are taken from a covariant light-front quark model; results are presented in two scenarios for the scalar mesons, with the finding that ar B^0 o D^+ a_0^- and ar B_s^0 o D_s^+ a_0^- reach O(10^{-4}) in scenario-2 under the explicit assumption that the scalars are lowest-lying p-wave states. The predictions are offered as motivation for searches at LHCb and SuperKEKB.

Significance. If the central numerical results hold under the stated scenario-2 assumption, the work supplies concrete, falsifiable predictions at the 10^{-4} level for modes that have not yet been measured. The explicit conditioning of the largest rates on the p-wave assignment for the scalars, together with the use of updated covariant light-front form factors, provides a transparent framework that can be tested once data become available. No machine-checked proofs or parameter-free derivations are present, but the conditional presentation of the O(10^{-4}) claim is a positive feature.

minor comments (3)
  1. The abstract and introduction should state the numerical size of the NLO corrections relative to the leading-order terms for at least one benchmark mode, to allow readers to assess their practical importance without consulting the full amplitude expressions.
  2. Table entries for branching ratios should include separate columns or footnotes for the individual sources of uncertainty (form-factor variation, scalar-meson inputs, CKM elements) rather than a single combined error, to facilitate comparison with future measurements.
  3. The definition of the two scenarios for the scalar mesons (including the explicit values adopted for decay constants and Gegenbauer moments) should be collected in a single dedicated subsection or table for quick reference.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive assessment of our work and the recommendation for minor revision. No specific major comments appear in the report.

Circularity Check

0 steps flagged

No significant circularity; derivation uses external inputs and explicit assumptions

full rationale

The paper computes branching ratios in the QCDF framework using NLO terms, form factors taken from an external covariant light-front quark model, and decay constants/DAs chosen under two explicitly stated scenarios for the scalar mesons. The O(10^{-4}) result is presented as conditional on scenario-2 (lowest-lying p-wave states) rather than derived from the inputs by construction. No self-definitional step, fitted parameter renamed as prediction, or load-bearing self-citation chain appears in the abstract or stated framework; the central claim remains an application of standard QCDF to chosen inputs.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 0 invented entities

Only abstract available so ledger is partial. Free parameters include the B to D transition form factors taken from an external model and the two scenarios for scalar meson structure. Axioms include the validity of QCDF at NLO for these decays and the identification of a0(1450) as a p-wave state in scenario-2. No invented entities.

free parameters (2)
  • B to D(*) transition form factors
    Updated values from covariant light-front quark model; these are inputs fitted or computed externally and directly scale the branching ratios.
  • Scalar meson decay constants and distribution amplitudes
    Differ between the two scenarios; scenario-2 choice produces the O(10^{-4}) result.
axioms (2)
  • domain assumption QCDF framework applies with NLO contributions to these b to c transitions
    Standard assumption in the field but not re-derived here.
  • ad hoc to paper Scalar mesons in scenario-2 are lowest-lying p-wave states
    This modeling choice controls the largest predicted rates.

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discussion (0)

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