Electroweak Corrections to the Charm-Top-Quark Contribution to $ε_K$

Brod, Joachim; Kvedaraitė, Sandra; Zachary, Polonsky,; Youssef, Ahmed M.

doi:10.48550/arxiv.2207.07669

Cited by 2 publications

(2 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Again, NNLO corrections are known [4,5,12,13,14] and also LD contributions have been estimated [15,16,17]. Large progress has been made recently in the work of Brod et al [18], in which the unitarity relation of the CKM matrix has been used in a special manner to reduce the uncertainty from the charm-quark contribution, leading to…”

Section: Kaon Mixingmentioning

confidence: 99%

Kaon physics overview

Aebischer

2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The present status of Kaon physics is summarized from a theory point of view. Focus is laid on ΔS = 2, ΔS = 1 as well as on rare Kaon decays, where progress has been made for instance in the case of εK and KS → μ + μ − Furthermore, several New Physics scenarios are discussed in the context of rare Kaon decays and other Kaon observables.

show abstract

Section: Kaon Mixingmentioning

confidence: 99%

Kaon physics overview

Aebischer

2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…Due to the impressive progress by LQCD and HQET done in the last decade, the hadronic matrix elements relevant for the latter observables are already known with a high precision. This is even more the case of short distance QCD contributions for which not only NLO QCD corrections are known [15][16][17][18] but also the NNLO ones [19][20][21]and the NLO electroweak corrections [22,23]. As the experimental precision on |ε K |, M s and M d is already impressive and the one on the mixing induced CP-asymmetry S ψ K S , that gives us β, will be improved by the LHCb and Belle II collaborations soon, this complex of F = 2 observables is in a much better shape than F = 1 transitions if both the status of the experiment and the status of the theory are simultaneously considered.…”

Section: Introductionmentioning

confidence: 99%

Standard Model predictions for rare K and B decays without new physics infection

Buras

2023

Eur. Phys. J. C

View full text Add to dashboard Cite

The Standard Model (SM) does not contain by definition any new physics (NP) contributions to any observable but contains four CKM parameters which are not predicted by this model. We point out that if these four parameters are determined in a global fit which includes processes that are infected by NP and therefore by sources outside the SM, the resulting so-called SM contributions to rare decay branching ratios cannot be considered as genuine SM contributions to the latter. On the other hand genuine SM predictions, that are free from the CKM dependence, can be obtained for suitable ratios of the K and B rare decay branching ratios to $$\Delta M_s$$ Δ M s , $$\Delta M_d$$ Δ M d and $$|\varepsilon _K|$$ | ε K | , all calculated within the SM. These three observables contain by now only small hadronic uncertainties and are already well measured so that rather precise SM predictions for the ratios in question can be obtained. In this context the rapid test of NP infection in the $$\Delta F=2$$ Δ F = 2 sector is provided by a $$|V_{cb}|-\gamma $$ | V cb | - γ plot that involves $$\Delta M_s$$ Δ M s , $$\Delta M_d$$ Δ M d , $$|\varepsilon _K|$$ | ε K | , and the mixing induced CP-asymmetry $$S_{\psi K_S}$$ S ψ K S . As with the present hadronic matrix elements this test turns out to be negative, assuming negligible NP infection in the $$\Delta F=2$$ Δ F = 2 sector and setting the values of these four observables to the experimental ones, allows to obtain SM predictions for all K and B rare decay branching ratios that are most accurate to date and as a byproduct to obtain the full CKM matrix on the basis of $$\Delta F=2$$ Δ F = 2 transitions alone. Using this strategy we obtain SM predictions for 26 branching ratios for rare semileptonic and leptonic K and B decays with the $$\mu ^+\mu ^-$$ μ + μ - pair or the $$\nu {\bar{\nu }}$$ ν ν ¯ pair in the final state. Most interesting turn out to be the anomalies in the low $$q^2$$ q 2 bin in $$B^+\rightarrow K^+\mu ^+\mu ^-$$ B + → K + μ + μ - ($$5.1\sigma $$ 5.1 σ ) and $$B_s\rightarrow \phi \mu ^+\mu ^-$$ B s → ϕ μ + μ - ($$4.8\sigma $$ 4.8 σ ).

show abstract

Electroweak Corrections to the Charm-Top-Quark Contribution to $ε_K$

Cited by 2 publications

References 18 publications

Kaon physics overview

Kaon physics overview

Standard Model predictions for rare K and B decays without new physics infection

Contact Info

Product

Resources

About