Implications for new physics from a novel puzzle in 
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Motivated by the reported discrepancies between experimental data and Standard Model predictions for the branching ratios of the color-allowed decays $$ \overline{B} $$ B ¯ 0 → D(*)+K− and $$ {\overline{B}}_s^0 $$ B ¯ s 0 → $$ {D}_s^{\left(\ast \right)+}{\pi}^{-} $$ D s ∗ + π − , we study final-state rescattering effects on $$ \overline{B} $$ B ¯ (s) → $$ {D}_{(s)}^{\left(\ast \right)}P $$ D s ∗ P and $$ \overline{B} $$ B ¯ (s) → D(s)V, where P(V) is a light pseudoscalar (vector) meson. We consider quasi-elastic rescatterings in the framework of SU(3) and U(3) flavor symmetries, and find that the effects cannot explain the measured branching ratios of the color-allowed and color-suppressed decays simultaneously. We also perform global fits to the $$ \overline{B} $$ B ¯ (s) → $$ {D}_{(s)}^{\left(\ast \right)}P $$ D s ∗ P and $$ \overline{B} $$ B ¯ (s) → D(s)V data, allowing for new physics contributions to the Wilson coefficient a1 associated with the color-allowed tree amplitudes. It is shown that the fits prefer a downward shift of $$ \mathcal{O} $$ O (10%) in a1 even in the presence of the quasi-elastic rescattering contributions.

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“…In each plot the black dotted line shows the result for the fit (i). to be 1 TeV as a reference [9]:…”

Section: Global Analysismentioning

confidence: 99%

Revisiting rescattering contributions to $$ \overline{B} $$(s) → $$ {D}_{(s)}^{\left(\ast \right)}M $$ decays

Endo

Iguro

Mishima

2022

J. High Energ. Phys.

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“…In this paper, as an alternative, we shall examine possible NP interpretations of the deviations observed; for recent discussions along this line, see refs. [40][41][42][43][44][45].…”

Section: Jhep10(2021)235mentioning

confidence: 99%

“…As emphasized already in ref. [51], such an NLO analysis in the NP sector is crucial for reducing certain unphysical scale and renormalization scheme dependences present in the absence of these O(α s ) corrections [40][41][42][43][44][45]. It is numerically found that, under the combined constraints from the current experimental data, the deviations observed could be well explained at the 1σ level by the NP four-quark operators with γ µ (1 − γ 5 ) ⊗ γ µ (1 − γ 5 ) structure, and also at the 2σ level by the operators with (1 + γ 5 ) ⊗ (1 − γ 5 ) and (1 + γ 5 ) ⊗ (1 + γ 5 ) structures.…”

Section: Jhep10(2021)235mentioning

confidence: 99%

Probing new physics in class-I B-meson decays into heavy-light final states

Cai

Deng

et al. 2021

J. High Energ. Phys.

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With updated experimental data and improved theoretical calculations, several significant deviations are being observed between the Standard Model predictions and the experimental measurements of the branching ratios of $$ {\overline{B}}_{(s)}^0\to {D}_{(s)}^{\left(\ast \right)+}{L}^{-} $$ B ¯ s 0 → D s ∗ + L − decays, where L is a light meson from the set {π, ρ, K(∗)}. Especially for the two channels $$ {\overline{B}}^0\to {D}^{+}{K}^{-} $$ B ¯ 0 → D + K − and $$ {\overline{B}}_s^0\to {D}_s^{+}{\pi}^{-} $$ B ¯ s 0 → D s + π − , both of which are free of the weak annihilation contribution, the deviations observed can even reach 4–5σ. Here we exploit possible new-physics effects in these class-I non-leptonic B-meson decays within the framework of QCD factorization. Firstly, we perform a model-independent analysis of the effects from twenty linearly independent four-quark operators that can contribute, either directly or through operator mixing, to the quark-level b →$$ c\overline{u}d(s) $$ c u ¯ d s transitions. It is found that, under the combined constraints from the current experimental data, the deviations observed could be well explained at the 1σ level by the new-physics four-quark operators with γμ(1 − γ5) ⨂ γμ(1 − γ5) structure, and also at the 2σ level by the operators with (1 + γ5) ⨂ (1 − γ5) and (1 + γ5) ⨂ (1 + γ5) structures. However, the new-physics four-quark operators with other Dirac structures fail to provide a consistent interpretation, even at the 2σ level. Then, as two specific examples of model-dependent considerations, we discuss the case where the new-physics four-quark operators are generated by either a colorless charged gauge boson or a colorless charged scalar, with their masses fixed both at the 1 TeV. Constraints on the effective coefficients describing the couplings of these mediators to the relevant quarks are obtained by fitting to the current experimental data.

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“…(s) → D + (s) π − [5][6][7][8]. Such decays are dominated by colour-allowed tree topologies JHEP10(2021)223…”

Section: Introductionmentioning

confidence: 99%

QED factorization of two-body non-leptonic and semi-leptonic B to charm decays

Beneke

Böer

Finauri

et al. 2021

J. High Energ. Phys.

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The QCD×QED factorization is studied for two-body non-leptonic and semi-leptonic B decays with heavy-light final states. These non-leptonic decays, like $$ {\overline{B}}_{(s)}^0\to {D}_{(s)}^{+}{\pi}^{-} $$ B ¯ s 0 → D s + π − and $$ {\overline{B}}_d^0\to {D}^{+}{K}^{-} $$ B ¯ d 0 → D + K − , are among the theoretically cleanest non-leptonic decays as penguin loops do not contribute and colour-suppressed tree amplitudes are suppressed in the heavy-quark limit or even completely absent. Advancing the theoretical calculations of such decays requires therefore also a careful analysis of QED effects. Including QED effects does not alter the general structure of factorization which is analogous for both semi-leptonic and non-leptonic decays. For the latter, we express our result as a correction of the tree amplitude coefficient a1. At the amplitude level, we find QED effects at the sub-percent level, which is of the same order as the QCD uncertainty. We discuss the phenomenological implications of adding QED effects in light of discrepancies observed between theory and experimental data, for ratios of non-leptonic over semi-leptonic decay rates. At the level of the rate, ultrasoft photon effects can produce a correction up to a few percent, requiring a careful treatment of such effects in the experimental analyses.

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Implications for new physics from a novel puzzle in B¯(s)0→

Cited by 31 publications

References 54 publications

Revisiting rescattering contributions to $$ \overline{B} $$(s) → $$ {D}_{(s)}^{\left(\ast \right)}M $$ decays

Revisiting rescattering contributions to $$ \overline{B} $$(s) → $$ {D}_{(s)}^{\left(\ast \right)}M $$ decays

Probing new physics in class-I B-meson decays into heavy-light final states

QED factorization of two-body non-leptonic and semi-leptonic B to charm decays

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