1.

Master formula for ε ′ / ε beyond the Standard Model
/ Aebischer, Jason ; Bobeth, Christoph ; Buras, Andrzej J. ; Gérard, JeanMarc ; et al
We present for the first time a master formula for ε′/ε , the ratio probing direct CP violation in K→ππ decays, valid in any ultraviolet extension of the Standard Model (BSM). [...]
Published in Physics letters B 792 (2019) 465469
10.1016/j.physletb.2019.04.016
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2.

Dual QCD Insight into BSM Hadronic Matrix Elements for $K^0$$\bar K^0$ Mixing from Lattice QCD
/ Buras, Andrzej J. ; Gérard, JeanMarc
We calculate BSM hadronic matrix elements for $K^0$$\bar K^0$ mixing in the Dual QCD approach (DQCD). [...]
Published in Acta Physica Polonica B 50 (2019) 121140
10.5506/APhysPolB.50.121
arXiv:1804.02401
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3.

BSM hadronic matrix elements for ε ′ / ε and K → ππ decays in the Dual QCD approach
/ Aebischer, Jason ; Buras, Andrzej ; Gérard, JeanMarc
We calculate for the first time all fourquark hadronic matrix elements of local operators possibly contributing to K → ππ decays and in particular to the ratio ε ′ /ε beyond the Standard Model (BSM). [...]
Published in JHEP 1902 (2019) 021
10.1007/JHEP02(2019)021
arXiv:1807.01709
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4.

K → ππ and K − π matrix elements of the chromomagnetic operators from Dual QCD
/ Buras, Andrzej ; Gérard, JeanMarc
We perform for the first time a direct calculation of onshell K → ππ hadronic matrix elements of chromomagnetic operators (CMO) in the Standard Model and beyond. [...]
Published in JHEP 1807 (2018) 126
10.1007/JHEP07(2018)126
arXiv:1803.08052
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5.

Final state interactions in K→ππ decays: ΔI=1/2 rule vs. ε′/ε
/ Buras, Andrzej J. ; Gérard, JeanMarc
Dispersive effects from strong ππ rescattering in the final state interaction (FSI) of weak K→ππ decays are revisited with the goal to have a global view on their relative importance for the ΔI=1/2 rule and the ratio ε′/ε in the standard model (SM). [...]
Published in EPJC 77 (2017) 10
10.1140/epjc/s1005201645867
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6.

Upper bounds on ε ′/ ε parameters B 6 (1/2) and B 8 (3/2) from large N QCD and other news
/ Buras, Andrzej ; Gérard, JeanMarc
We demonstrate that in the large N approach developed by the authors in collaboration with Bardeen, the parameters B 6 (1/2) and B 8 (3/2) parametrizing the K → ππ matrix elements 〈 Q 6 〉 0 and 〈 Q 8 〉 2 of the dominant QCD and electroweak operators receive both negative O 1 / N $$ \mathcal{O}\left(1/N\right) $$ corrections such that B 6 (1/2) ≤ B 8 (3/2) < 1 in agreement with the recent lattice results of the RBCUKQCD collaboration. [...]
Published in JHEP 1512 (2015) 008
10.1007/JHEP12(2015)008
arXiv:1507.06326
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7.

Large N approach to Kaon decays and mixing 28 years later: ΔI=1/2 rule, B^K , and ΔMK
/ Buras, Andrzej J. ; Gérard, JeanMarc ; Bardeen, William A.
We review and update our results for K→ππ decays and K0 – K¯0 mixing obtained by us in the 1980s within an analytic approximate approach based on the dual representation of QCD as a theory of weakly interacting mesons for large N , where N is the number of colors. [...]
Published in EPJC 74 (2014) 2871
10.1140/epjc/s100520142871x
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8.

Ultimate survival in anomalous ψ(2S) decays
/ Gérard, JeanMarc ; Martini, Antony
The hierarchy among the radiative γ(π0,η,η′) decay channels for the ψ′ looks quite different from the J/ψ one. [...]
Published in Physics letters B 730 (2014) 264266
10.1016/j.physletb.2014.01.068
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