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Title: Large $$N$$ approach to kaon decays and mixing 28 years later: $$\Delta I = 1/2$$ rule, $$\hat B_K$$ and $$\Delta M_K$$

Journal Article · · European Physical Journal. C, Particles and Fields
 [1];  [2];  [3]
  1. TUM Institute for Advanced Study, Garching (Germany); Technische Univ. Munchen, Garching (Germany)
  2. Univ. catholique de Louvain, Louvain-la-Neuve (Belgium)
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

We review and update our results for K → π π decays and K⁰- K¯⁰ mixing obtained by us in the 1980s within an approach based on the dual representation of QCD as a theory of weakly interacting mesons for large N colours. In our analytic approach the dynamics behind the enhancement of ReA0 and suppression of ReA2, the so-called ΔI = 1/2 rule for K → π π decays, has a simple structure: the usual octet enhancement through quark-gluon renormalization group evolution down to the scales O(1 GeV) is continued as a meson evolution down to zero momentum scales at which the factorization of hadronic matrix elements is at work. The inclusion of lowest-lying vector meson contributions in addition to the pseudoscalar ones and of Wilson coefficients in a momentum scheme improves significantly the matching between quark-gluon and meson evolutions. In particular, the anomalous dimension matrix governing the meson evolution exhibits the structure of the known anomalous dimension matrix in the quark-gluon evolution. The recent results on ReA2 and ReA0 from the RBC-UKQC collaboration give support for our approach. In particular, the signs of the two main contractions found numerically by these authors follow uniquely from our analytic approach. At NLO in 1/N we obtain R = ReA0/ReA2= 16.0±1.5 which amounts to an order of magnitude enhancement over the strict large N limit value √2. QCD penguins contribute at 15% level to this result. We also find B^K = 0.73± 0.02, with the smallness of 1/N corrections to the large N value B^K = 3/4 resulting within our approach from an approximate cancellation between pseudoscalar and vector meson one-loop contributions. We summarize the status of ΔMK in this approach.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1128718
Report Number(s):
FERMILAB-PUB-14-001-T; arXiv eprint number arXiv:1401.1385
Journal Information:
European Physical Journal. C, Particles and Fields, Vol. 74, Issue 5; ISSN 1434-6044
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 80 works
Citation information provided by
Web of Science

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Cited By (15)

Leptoquarks meet ε′/ε and rare Kaon processes journal February 2018
ε ′ /ε in 331 models journal March 2016
K → ππ and K − π matrix elements of the chromomagnetic operators from Dual QCD journal July 2018
K → π ν ν ¯ $$ K\to \pi \nu \overline{\nu} $$ and ε′/ε in simplified new physics models journal November 2015
Improved anatomy of ε′/ε in the Standard Model journal November 2015
Singularity-free next-to-leading order ΔS = 1 renormalization group evolution and ϵ K ′ /ϵK in the Standard Model and beyond journal December 2016
Direct CP violation in ${K^0\to\pi\pi}$ : Standard Model Status journal June 2018
Towards NNLO accuracy for ε′/ε journal January 2017
Kaon C P violation and neutron EDM in the minimal left-right symmetric model journal February 2020
Supersymmetric Explanation of C P Violation in K → π π Decays journal August 2016
Final state interactions in $$K\rightarrow \pi \pi $$ K → π π decays: $$\Delta I=1/2$$ Δ I = 1 / 2 rule vs. $$\varepsilon '/\varepsilon $$ ε ′ / ε journal January 2017
Anatomy of $$\varepsilon '/\varepsilon $$ ε ′ / ε beyond the standard model journal March 2019
Violation of lepton flavor and lepton flavor universality in rare kaon decays text January 2016
Supersymmetric Explanation of CP Violation in K →ππ Decays text January 2016
Kaon CP violation and neutron EDM in the minimal left-right symmetric model text January 2019

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