BSM hadronic matrix elements for ε′/ε and K → ππ decays in the Dual QCD approach

Aebischer, Jason; Buras, Andrzej J.; Gérard, Jean-Marc

doi:10.1007/jhep02(2019)021

Cited by 28 publications

(58 citation statements)

References 103 publications

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“…This work has been supported in part by the Spanish Government and ERDF funds from the EU Table 10: Parameters n i and X i entering the prediction of the LECs (g 8 N i ) ∞ in Eq. (34). Table 10 compiles the values of n i and X i that parametrize the large-N C predictions for the weak LECs (g 8 N i ) ∞ in Eq.…”

Section: Acknowledgementsmentioning

confidence: 99%

Isospin-violating contributions to ∈′/∈

Cirigliano

Gisbert

Pich

et al. 2020

J. High Energ. Phys.

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The known isospin-breaking contributions to the K → ππ amplitudes are reanalyzed, taking into account our current understanding of the quark masses and the relevant non-perturbative inputs. We present a complete numerical reappraisal of the direct CP-violating ratio / , where these corrections play a quite significant role. We obtain the Standard Model prediction Re ( / ) = (14 ± 5) · 10 −4 , which is in very good agreement with the measured ratio. The uncertainty, which has been estimated conservatively, is dominated by our current ignorance about 1/N C -suppressed contributions to some relevant chiral-perturbation-theory low-energy constants.

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Section: Acknowledgementsmentioning

confidence: 99%

Isospin-violating contributions to ∈′/∈

Cirigliano

Gisbert

Pich

et al. 2020

J. High Energ. Phys.

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“…This pattern is led by the one-loop chiral loop contributions, which include the final state rescattering. 3 In the third column of Table I we report the results obtained with the Dual QCD (DQCD) approach [68] (for a recent summary and references see Ref. [36]).…”

Section: B Matrix Elementsmentioning

confidence: 99%

Kaon CP violation and neutron EDM in the minimal left-right symmetric model

2020

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Within the minimal Left-Right (LR) symmetric model we revisit the predictions for the kaon CP violating observables ε and ε in correlation with the neutron electric dipole moment. We perform a complete study of the cross constraints on the model parameters, phases and the MW R scale, considering the two cases of extended parity or charge conjugation as LR discrete symmetries, together with the possible presence of a Peccei-Quinn symmetry. We discuss in particular two scenarios: whether the Standard Model saturates the experimental value of ε /ε or whether new physics is needed, still an open issue after the recent lattice results on the QCD penguin matrix elements. Within the first scenario, we find no constraints on the LR scale in the charge-conjugation case while in the parity case we show that MW R can be as low as 13 TeV. On the other side, the request that new physics contributes dominantly to ε implies strong correlations among the model parameters, with an upper bound of MW R < 8-100 TeV depending on tan β in the case of charge conjugation and a range of MW R 7-45 TeV in the parity setup. Both scenarios may be probed directly at future colliders and only indirectly at the LHC. * stefano.bertolini@sissa.it † Alessio.Maiezza@irb.hr ‡ fabrizio.nesti@aquila.infn.it Right (LR) symmetric theories, based on the gauge groupA particular role is played by the minimal version of the Left-Right symmetric models (LRSM) [9]. Besides being predictive, the model provides a natural rationale for the origin and smallness of the neutrino mass [10,11], a setup for the restoration of parity at high scale [12], and a novel source for neutrinoless double-beta decay [13,14]. The LRSM has aroused a renewed interest in the era of LHC, because of the possibility of a direct detection via the Keung-Senjanovic (KS) process [15], which violates lepton number in full analogy with the low energy neutrinoless double-beta decay.

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“…• The parameter ε /ε measuring the ratio of direct to indirect CP violation in K L → ππ [51,[53][54][55][56].…”

Section: Fcnc K Decaysmentioning

confidence: 99%

A global likelihood for precision constraints and flavour anomalies

et al. 2019

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We present a global likelihood function in the space of dimension-six Wilson coefficients in the Standard Model Effective Field Theory (SMEFT). The likelihood includes contributions from flavour-changing neutral current B decays, lepton flavour universality tests in charged-and neutral-current B and K decays, mesonantimeson mixing observables in the K, B, and D systems, direct CP violation in K → ππ, charged lepton flavour violating B, tau, and muon decays, electroweak precision tests on the Z and W poles, the anomalous magnetic moments of the electron, muon, and tau, and several other precision observables, 265 in total. The Wilson coefficients can be specified at any scale, with the one-loop running above and below the electroweak scale automatically taken care of. The implementation of the likelihood function is based on the open source tools flavio and wilson as well as the open Wilson coefficient exchange format (WCxf) and can be installed as a Python package. It can serve as a basis either for model-independent fits or for testing dynamical models, in particular models built to address the anomalies in B physics. We discuss a number of example applications, reproducing results from the EFT and model building literature.

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BSM hadronic matrix elements for ε′/ε and K → ππ decays in the Dual QCD approach

Cited by 28 publications

References 103 publications

Isospin-violating contributions to ∈′/∈

Isospin-violating contributions to ∈′/∈

Kaon CP violation and neutron EDM in the minimal left-right symmetric model

A global likelihood for precision constraints and flavour anomalies

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