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 form factors from lattice QCD and phenomenology of 
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Meinel, Stefan

doi:10.1103/physrevd.97.034511

Cited by 66 publications

(67 citation statements)

References 47 publications

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“…The obtained results for the branching fractions are given in Table 4 in comparison with other theoretical predictions. We see that our predictions agree well with recent lattice QCD calculations [7] especially for the c → pμ + μ − branching fraction with the account of the resonance contributions. On the other hand, the nonresonant branching fractions from Refs.…”

Section: Fig 2 Helicity Form Factors Of the Rare C → P Transitionsupporting

confidence: 81%

“…On the other hand, the nonresonant branching fractions from Refs. [5,6], which employ the lightcone sum rules, are 2 orders of magnitude lower than our predictions and 3 orders of magnitude lower than the lattice results [7]. Our prediction for the c → pμ + μ − nonresonant branching fraction is about a factor of 15 lower than the lattice QCD result [7].…”

Section: Fig 2 Helicity Form Factors Of the Rare C → P Transitioncontrasting

confidence: 41%

“…2. In Table 3 we compare our results for these form factors with the values calculated on the lattice [7] both at minimum q 2 = q 2 max and maximum q 2 = 0 recoil of the final proton. We find that our and lattice form factors at q 2 = 0 have close values, while most of the lattice form factors at q 2 = q 2 max have somewhat larger values than ours.…”

Section: Vat Vt a Imentioning

confidence: 92%

“…Recently the form factors of the weak c → p transitions were calculated on the lattice [7]. The author used the helicity-based definition of the form factors.…”

Section: Vat Vt a Imentioning

confidence: 99%

“…The lattice QCD determination of the c → p form factors and the c → pμ + μ − rare decay observables was recently presented in Ref. [7]. Experimentally first constraints on the c rare decay branching fractions were set by the BABAR Collaboration [8] and very recently they were significantly improved by the LHCb Collaboration [9].…”

Section: Introductionmentioning

confidence: 99%

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Rare $$\Lambda _c\rightarrow p \ell ^+\ell ^-$$ Λ c → p ℓ + ℓ -

Фаустов

Galkin

2018

Eur. Phys. J. C

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The relativistic quark model based on the quasipotential approach with the QCD-motivate potential is employed for the calculation of the form factors of the c → p rare weak transitions. Their momentum dependence is explicitly determined without additional assumptions and extrapolations in the whole kinematical range of the momentum transfer squared q 2 . The differential c → pl + l − decay branching fractions and angular distributions are calculated on the basis of these form factors. Both the perturbative and effective Wilson coefficients, which include contributions of vector meson resonances, are used. The calculated branching fraction of the c → pμ + μ − rare decay is well consistent with the experimental upper limit very recently set by the LHCb Collaboration.

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Section: Fig 2 Helicity Form Factors Of the Rare C → P Transitionsupporting

confidence: 81%

Section: Fig 2 Helicity Form Factors Of the Rare C → P Transitioncontrasting

confidence: 41%

Section: Vat Vt a Imentioning

confidence: 92%

“…Recently the form factors of the weak c → p transitions were calculated on the lattice [7]. The author used the helicity-based definition of the form factors.…”

Section: Vat Vt a Imentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rare $$\Lambda _c\rightarrow p \ell ^+\ell ^-$$ Λ c → p ℓ + ℓ -

Фаустов

Galkin

2018

Eur. Phys. J. C

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New physics in s → d semileptonic transitions: rare hyperon vs. kaon decays

Geng

Camalich

Shi

2022

J. High Energ. Phys.

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We investigate the potential of rare hyperon decays to probe the short distance structure in the $$ s\to dv\overline{v} $$ s → dv v ¯ and s → dℓ+ℓ− transitions. Hyperon decays into neutrinos $$ \left({B}_1\to {B}_2v\overline{v}\right) $$ B 1 → B 2 v v ¯ can be reliably predicted by using form factors determined in baryon chiral perturbation theory. Their decay rates are sensitive to different short-distance operators, as compared to their kaon counterparts, and the corresponding branching fractions are in the range of 10−14 ∼ 10−13 in the standard model. In the context of the low-energy effective theory, we find that the anticipated BESIII measurements of the $$ {B}_1\to {B}_2v\overline{v} $$ B 1 → B 2 v v ¯ decays would lead to constraints on new physics in the purely axial vector $$ \overline{d}{\gamma}_{\mu }{\gamma}_5s $$ d ¯ γ μ γ 5 s current that are stronger than the present limits from their kaon siblings $$ K\to \pi \pi v\overline{v} $$ K → ππv v ¯ . On the other hand, although hyperon decays into charged leptons are dominated by long-distance hadronic contributions, angular observable such as the leptonic forward-backward asymmetry is sensitive to the interference between long- and short-distance contributions. We discuss the sensitivity to new physics of a potential measurement of this observable in comparison with observables in the kaon decays KL→ μ+μ− and K+→ π+μ+μ−. We conclude that the current kaon bounds are a few orders of magnitude better than those that could be obtained from Σ+→ pμ+μ− except for two scenarios with new physics in the $$ \left(\overline{d}{\gamma}^{\mu }s\right)\left(\overline{\mathrm{\ell}}{\gamma}_{\mu }{\gamma}_5\mathrm{\ell}\right) $$ d ¯ γ μ s ℓ ¯ γ μ γ 5 ℓ and $$ \left(\overline{d}{\gamma}^{\mu }{\gamma}_5s\right)\left(\overline{\mathrm{\ell}}{\gamma}_{\mu}\mathrm{\ell}\right) $$ d ¯ γ μ γ 5 s ℓ ¯ γ μ ℓ currents. Finally, we point out that the loop effects from renormalization group evolution are important in this context, when relating the low-energy effective field theory to new physics models in the UV.

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Exploring charm decays with missing energy in leptoquark models

Faisel

Tandean

2021

J. High Energ. Phys.

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We investigate the possibility that scalar leptoquarks generate consequential effects on the flavor-changing neutral-current decays of charmed hadrons into final states with missing energy "Image missing" carried away by either standard model or sterile neutrinos. We focus on scenarios involving the R2, $$ {\tilde{R}}_2 $$ R ˜ 2 , and $$ {\overline{S}}_1 $$ S ¯ 1 leptoquarks and take into account various pertinent constraints, learning that meson-mixing ones and those inferred from collider searches can be of significance. We find in particular that the branching fractions of charmed meson decays D →"Image missing", M = π, ρ, and Ds→"Image missing" and singly charmed baryon decays $$ {\Lambda}_c^{+} $$ Λ c + →"Image missing" and Ξc→"Image missing" are presently allowed to attain the 10−7-10−6 levels if induced by R2 and that the impact of $$ {\tilde{R}}_2 $$ R ˜ 2 is comparatively much less. In contrast, the contributions of $$ {\overline{S}}_1 $$ S ¯ 1 , which couples to right-handed up-type quarks and the sterile neutrinos, could lead to branching fractions as high as order 10−3. This suggests that these charmed hadron decays might be within reach of the BESIII and Belle II experiments or future super charm-tau factories and could serve as potentially promising probes of leptoquark interactions with sterile neutrinos.

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Λc→N form factors from lattice QCD and phenomenology of Λc→

Cited by 66 publications

References 47 publications

Rare $$\Lambda _c\rightarrow p \ell ^+\ell ^-$$ Λ c → p ℓ + ℓ -

Rare $$\Lambda _c\rightarrow p \ell ^+\ell ^-$$ Λ c → p ℓ + ℓ -

New physics in s → d semileptonic transitions: rare hyperon vs. kaon decays

Exploring charm decays with missing energy in leptoquark models

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