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- Cirigliano, V., et al.
(author)
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A complete update of ε0/ε in the standard model
- 2019
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In: European Physical Society Conference on High Energy Physics (EPS-HEP2019). - Trieste, Italy : Sissa Medialab. - 1824-8039. ; 364
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Conference paper (peer-reviewed)abstract
- The recent release of improved lattice data has revived again the interest on precise theoretical calculations of the direct CP-violation ratio ε0/ε. We present a complete update of the Standard Model prediction [1,2], including a new re-analysis of isospin-breaking corrections which are of vital importance in the theoretical determination of this observable. The Standard Model prediction, Re(ε0/ε) = (14±5)·10−4, turns out to be in good agreement with the experimental measurement.
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| 3. |
- Cirigliano, V., et al.
(author)
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Isospin-breaking contributions to ϵ ′/ϵ
- 2020
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In: International Conference on Kaon Physics 2019 10-13 September 2019, University of Perugia, Italy. - : IOP Publishing. - 1742-6588. ; 1526
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Conference paper (peer-reviewed)abstract
- We present an updated analysis of isospin-violating corrections to ϵ0=ϵ in the framework of chiral perturbation theory, taking advantage of the currently improved knowledge on quark masses and nonperturbative parameters. The role of the different ingredients entering into the analysis is carefully assessed. Our final result is ωeff = 0:110 +0:090 -0:088 [1].
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| 4. |
- Cirigliano, V., et al.
(author)
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Isospin-violating contributions to ∈′/∈
- 2020
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In: Journal of High Energy Physics. - 1029-8479. ; 2020:2
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Journal article (peer-reviewed)abstract
- 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/NC-suppressed contributions to some relevant chiral-perturbation-theory low-energy constants.
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| 5. |
- Cirigliano, V., et al.
(author)
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Theoretical status of ϵ ′/ϵ
- 2020. - 1
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In: Journal of Physics: Conference Series : International Conference on Kaon Physics 2019 10-13 September 2019, University of Perugia, Italy - International Conference on Kaon Physics 2019 10-13 September 2019, University of Perugia, Italy. - : IOP Publishing. - 1742-6588. ; 1526
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Conference paper (peer-reviewed)abstract
- We briefly overview the historical controversy around Standard Model predictions of ϵ ′/ϵ and clarify the underlying physics. A full update of this important observable is presented, with all known short-and long-distance contributions, including isospin-breaking corrections. The current Standard Model prediction, Re(ϵ ′/ϵ) = (14 ± 5) • 10-4 [1, 2], is in excellent agreement with the experimentally measured value.
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