Prospects for a lattice computation of rare kaon decay amplitudes:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>π</mml:mi><mml:msup><mml:mo>ℓ</mml:mo><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mo>ℓ</mml:mo><mml:mo>−</mml:mo></mml:msup></mml:math>decays

Christ, Norman H.; Feng, Xu; Portelli, Antonin; Sachrajda, Christopher

doi:10.1103/physrevd.92.094512

Cited by 47 publications

(73 citation statements)

References 27 publications

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“…νν decay could be applied to hyperon decays, for example, to the recent lattice QCD calculations on the Z-penguin-like kaon decays [87][88][89].…”

Section: Discussionmentioning

confidence: 99%

Prospects for rare and forbidden hyperon decays at BESIII

2017

Front. Phys.

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The study of hyperon decays at the Beijing Electron Spectrometer III (BESIII) is proposed to investigate the events of $J/\psi$ decay into hyperon pairs, which provide a pristine experimental environment at the Beijing Electron--Positron Collider II. About $10^{6}$--$10^8$ hyperons, i.e., $\Lambda$, $\Sigma$, $\Xi$, and $\Omega$, will be produced in the $J/\psi$ and $\psi(2S)$ decays with the proposed data samples at BESIII. Based on these samples, the measurement sensitivity of the branching fractions of the hyperon decays is in the range of $10^{-5}$--$10^{-8}$. In addition, with the known center-of-mass energy and "tag technique," rare decays and decays with invisible final states can be probed.Comment: 8 pages, 8 tables, add more references and corrections; many typos fixe

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“…νν decay could be applied to hyperon decays, for example, to the recent lattice QCD calculations on the Z-penguin-like kaon decays [87][88][89].…”

Section: Discussionmentioning

confidence: 99%

Prospects for rare and forbidden hyperon decays at BESIII

2017

Front. Phys.

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“…This is the case of RS scenario with custodial protection [68]. There are also recent efforts to improve SM prediction by means of lattice QCD [109]. The importance of testing NP scenarios, in particular those involving right-handed currents, by means of these decays has been stressed in [106].…”

Section: D2 Z and Z Casesmentioning

confidence: 99%

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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“…Preliminary results using only the connected diagrams can be found in Refs. [13,14,15]. While we have not obtained a signal for the amplitude due to the absence of disconnected diagrams, we have demonstrated the efficacy of our approach and have laid the groundwork for extending to physical masses.…”

Section: Rare Kaon Decaysmentioning

confidence: 87%

Standard Model Prediction for Direct CP-violation in K-decays, and Long-Distance Contributions to Kaonic Ampltiudes

Kelly¹

2017

Proceedings of 38th International Conference on High Energy Physics — PoS(ICHEP2016)

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Recent theoretical and computational advances have enabled the precision determination of multiparticle Standard Model amplitudes using lattice QCD. In particular the measure of direct CPviolation in kaon decays, ε ′ , has now been computed with errors that are 40% of the experimental value; this quantity is highly sensitive to BSM sources of CP-violation and may help shed light on the origin of the matter-antimatter asymmetry in the Universe. We will discuss this calculation of ε ′ and our present and future efforts in improving our result. We will also briefly discuss our ongoing calculations of other long-distance contributions to kaonic amplitudes sensitive to new physics.

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Prospects for a lattice computation of rare kaon decay amplitudes:K→πℓ+ℓ−decays

Cited by 47 publications

References 27 publications

Prospects for rare and forbidden hyperon decays at BESIII

Prospects for rare and forbidden hyperon decays at BESIII

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

Standard Model Prediction for Direct CP-violation in K-decays, and Long-Distance Contributions to Kaonic Ampltiudes

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