Precise measurements of direct<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>violation,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi><mml:mi>T</mml:mi></mml:math>symmetry, and other parameters in the neutral kaon system

Abouzaid, E.; Arenton, M. W.; Barker, A. R.; Barrio, M.; Bellantoni, L.; Blucher, E.; Bock, G. J.; Bown, C.; Cheu, E.; Coleman, R.; Corcoran, M.; Cox, B.; Erwin, A. R.; Escobar, C. O.; Glazov, A.; Golossanov, A.; Gomes, R. A.; Gouffon, P.; Graham, J.; Hamm, J.; Hsiung, Y.; Jensen, D.; Keßler, R.; Kotera, Katsushige; LaDue, J.; Ledovskoy, A.; McBride, P.; Monnier, E.; Nguyen, H. H.; Niclasen, R.; Phillips, D. G.; Prasad, V.; Qi, X. R.; Ramberg, E.; Ray, R. E.; Ronquest, M.; Roodman, A.; Santos, Edivaldo Moura; Shanahan, P.; Shawhan, P.; Slater, W.; Smith, D.; Solomey, N.; Swallow, E. C.; Taegar, S. A.; Toale, P. A.; Tschirhart, R.; Wah, Y. W.; Wang, James; White, H. B.; Whitmore, J.; Wilking, M. J.; Winstein, B.; Winston, R.; Worcester, E.; Yamanaka, T.; Zimmerman, E. D.; Zukanovich, R. F.

doi:10.1103/physrevd.83.092001

Cited by 100 publications

(62 citation statements)

References 36 publications

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“…This result differs with 2.9 σ significance from the experimental world average from NA48 [6] and KTeV [7,8] collaborations, (ε /ε) exp = (16.6 ± 2.3) × 10…”

Section: Jhep04(2016)071 1 Introductioncontrasting

confidence: 69%

New physics patterns in ε′/ε and ε K with implications for rare kaon decays and ∆M K

Buras

2016

J. High Energ. Phys.

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Abstract:The Standard Model (SM) prediction for the ratio ε /ε appears to be significantly below the experimental data. Also ε K in the SM tends to be below the data. Any new physics (NP) removing these anomalies will first of all have impact on flavour observables in the K meson system, in particular on rare decaysRestricting the operators contributing to ε /ε to the SM ones and to the corresponding primed operators, NP contributions to ε /ε are quite generally dominated either by QCD penguin (QCDP) operators Q 6 (Q 6 ) or electroweak penguin (EWP) operators Q 8 (Q 8 ) with rather different implications for other flavour observables. Our presentation includes general models with tree-level Z and Z flavour violating exchanges for which we summarize known results and add several new ones. We also briefly discuss few specific models. The correlations of ε /ε with other flavour observables listed above allow to differentiate between models in which ε /ε can be enhanced. Various DNA-tables are helpful in this respect. We find that simultaneous enhancements of ε /ε, ε K , B(K L → π 0 νν) and B(K + → π + νν) in Z scenarios are only possible in the presence of both left-handed and right-handed flavour-violating couplings. In Z scenarios this is not required but the size of NP effects and the correlation between B(K L → π 0 νν) and B(K + → π + νν) depends strongly on whether QCDP or EWP dominate NP contributions to ε /ε. In the QCDP case possible enhancements of both branching ratios are much larger than for EWP scenario and take place only on the branch parallel to the Grossman-Nir bound, which is in the case of EWP dominance only possible in the absence of NP in ε K . We point out that QCDP and EWP scenarios of NP in ε /ε can also be uniquely distinguished by the size and the sign of NP contribution to ∆M K , elevating the importance of the precise calculation of ∆M K in the SM. We emphasize the importance of the theoretical improvements not only on ε /ε, ε K and ∆M K but also on K L → µ + µ − , K L → π 0 + − , and the K → ππ isospin amplitudes ReA 0 and ReA 2 which would in the future enrich our analysis.

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“…This result differs with 2.9 σ significance from the experimental world average from NA48 [6] and KTeV [7,8] collaborations, (ε /ε) exp = (16.6 ± 2.3) × 10…”

Section: Jhep04(2016)071 1 Introductioncontrasting

confidence: 69%

New physics patterns in ε′/ε and ε K with implications for rare kaon decays and ∆M K

Buras

2016

J. High Energ. Phys.

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“…• Recent analyses in [6][7][8][9] find the ratio ε /ε in the SM to be significantly below the experimental world average from NA48 [10] and KTeV [11,12] collaborations. The recent analysis in the large N approach in [13] indicates that final state interactions will not modify this picture at least on the qualitative level.…”

Section: Jhep08(2016)115mentioning

confidence: 95%

“…This appears presently problematic in view of the findings in [7][8][9]39] that a significant upwards shift ε /ε of at least 5 × 10 −4 is required to bring the theory to agree with the data from from NA48 [10] and KTeV [11,12] collaborations. The question then arises whether including Z − Z mixing we can obtain the required positive shift in ε /ε.…”

Section: Jhep08(2016)115mentioning

confidence: 99%

331 Models Facing the Tensions in ΔF = 2 Processes with the Impact on ε ′ /ε, B s → μ + μ − and B →K ∗ μ + μ −

Buras

Fazio

2016

J. High Energ. Phys.

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and CMFV models, we demonstrate that these tensions can be removed in 331 models based on the gauge group SU(3) C × SU(3) L × U(1) X both for M Z in the LHC reach and well beyond it. But the implied new physics (NP) patterns in ∆F = 1 observables depend sensitively on the value of |V cb |. Concentrating the analysis on three 331 models that have been selected by us previously on the basis of their performance in electroweak precision tests and ε /ε we illustrate this for |V cb | = 0.042 and |V cb | = 0.040. We find that these new lattice data still allow for positive shifts in ε /ε up to 6 × 10 −4 for M Z = 3 TeV and |V ub | = 0.0036 for both values of |V cb | but for M Z = 10 TeV only for |V cb | = 0.040 such shifts can be obtained. For |V ub | = 0.0042 maximal shifts in ε /ε increase to 7×10 −4 . NP effects in B s → µ + µ − and in the Wilson coefficient C 9 are significantly larger in all three models for the case of |V cb | = 0.040. In particular in two models the rate for B s → µ + µ − can be reduced by NP by 20% for M Z = 3 TeV resulting in values in the ballpark of central values from CMS and LHCb. In the third model a shift in C 9 up to C NP 9 = −0.5 is possible. For |V cb | = 0.042, NP effects in B s → µ + µ − and in C 9 are by at least a factor of two smaller. For M Z = 10 TeV NP effects in B s → µ + µ − and C 9 , independently of |V cb |, are at most at the level of a few percent. We also consider the simplest 331 model, analyzed recently in the literature, in which X = Y , the usual hypercharge. We find that JHEP08 (2016)115 in this model NP effects in flavour observables are much smaller than in the three models with X = Y , in particular NP contributions to the ratio ε /ε are very strongly suppressed. Our analysis exhibits the important role of lattice QCD and of precise values of CKM parameters, in particular |V cb |, for quark flavour phenomenology beyond the SM. It also demonstrates exceptional role of ∆F = 2 observables and of ε /ε in testing high energy scales beyond the LHC.

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“…The search for physics beyond the Standard Model (SM) has brought about a search for CP violation beyond what is generated by the phase in the CKM matrix [1][2][3]. The challenging measurement and conclusive evidence of a non-vanishing value for the ratio / [4][5][6] has excluded the superweak hypothesis of Wolfenstein [7]. However, / has not yet facilitated a severe test of the SM.…”

Section: Introductionmentioning

confidence: 99%

SU(3)F breaking through final state interactions and CP asymmetries in <

2019

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Precise measurements of directCPviolation,CPTsymmetry, and other parameters in the neutral kaon system

Cited by 100 publications

References 36 publications

New physics patterns in ε′/ε and ε K with implications for rare kaon decays and ∆M K

New physics patterns in ε′/ε and ε K with implications for rare kaon decays and ∆M K

331 Models Facing the Tensions in ΔF = 2 Processes with the Impact on ε ′ /ε, B s → μ + μ − and B →K ∗ μ + μ −

SU(3)F breaking through final state interactions and CP asymmetries in <

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