New Physics Signatures in Kaon Decays

Blanke, Monika

doi:10.22323/1.181.0010

Cited by 10 publications

(13 citation statements)

References 32 publications

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“…In particular in [288] the status of NP contributions as of 2008 has been reviewed. A recent short review of NP signatures in Kaon decays can be found in [292].…”

Section: Preliminariesmentioning

confidence: 99%

Towards the identification of new physics through quark flavour violating processes

2014

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We outline a systematic strategy which should help in this decade to identify New Physics (NP) beyond the Standard Model (SM) by means of quark flavour violating processes and thereby to extend the picture of short distance physics down to the scales as short as 10 −20 m and even shorter distance scales corresponding to energies of 100 TeV. Rather than using all possible flavour violating observables that will be measured in the coming years at the LHC, SuperKEKB and in Kaon physics dedicated experiments at CERN, J-PARC and Fermilab, we concentrate on those observables that are theoretically clean and very sensitive to NP. Assuming that the data on the selected observables by us will be very precise, we stress the importance of correlations between these observables as well as of future precise calculations of non-perturbative parameters by means of lattice QCD simulations with dynamical fermions. Our strategy consists of twelve steps which we will discuss in detail illustrating possible outcomes with the help of the SM, models with constrained Minimal Flavour Violation (CMFV), MFV at large and models with tree-level FCNCs mediated by neutral gauge bosons and scalars. We also briefly summarize the status of a number of concrete models. We propose DNA-charts that exhibit correlations between flavour observables in different NP scenarios. The models with new left-handed and/or right-handed currents and non-MFV interactions can be distinguished transparently in this manner. We emphasize the important role of the stringent CMFV relations between various observables as standard candles of flavour physics. The pattern of deviations from these relations may help in identifying the correct NP scenario. The success of this program will be very much facilitated through direct signals of NP at the LHC even if LHC will not be able to probe the physics at scales shorter than 4×10 −20 m. We also emphasize the importance of lepton flavour violation, electric dipole moments and (g − 2) e,µ in these studies.

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“…In particular in [288] the status of NP contributions as of 2008 has been reviewed. A recent short review of NP signatures in Kaon decays can be found in [292].…”

Section: Preliminariesmentioning

confidence: 99%

Towards the identification of new physics through quark flavour violating processes

2014

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“…Note that in the SM the sign of X(x t ) is positive. Recalling the relation Reλ 17) accurate to λ 4 terms, and solving for β then gives…”

Section: Jhep11(2015)033mentioning

confidence: 99%

“…Moreover, extensive calculations of isospin breaking effects and non-perturbative effects have been performed [10,11]. Reviews of these two decays can be found in [12][13][14][15][16][17][18] and their power in probing energy scales as high as several hundreds of TeV has been demonstrated in [19].…”

Section: Introductionmentioning

confidence: 99%

K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ and K L → π 0 ν ν ¯ $$ {K}_L\to {\pi}^0\nu \overline{\nu} $$ in the Standard Model: status and perspectives

Buras

Buttazzo

Girrbach-Noe

et al. 2015

J. High Energ. Phys.

265

150

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In view of the recent start of the NA62 experiment at CERN that is expected to measure the K + → π + νν branching ratio with a precision of 10%, we summarise the present status of this promising decay within the Standard Model (SM). We do likewise for the closely related K L → π 0 νν, which will be measured by the KOTO experiment around 2020. As the perturbative QCD and electroweak corrections in both decays are under full control, the dominant uncertainties within the SM presently originate from the CKM parameters |V cb |, |V ub | and γ. We show this dependence with the help of analytic expressions as well as accurate interpolating formulae. Unfortunately a clarification of the discrepancies between inclusive and exclusive determinations of |V cb | and |V ub | from tree-level decays will likely require results from the Belle II experiment available at the end of this decade. Thus we investigate whether higher precision on both branching ratios is achievable by determining |V cb |, |V ub | and γ by means of other observables that are already precisely measured. In this context ε K and ∆M s,d , together with the expected progress in QCD lattice calculations will play a prominent role. We find B(K + → π + νν) = (9.11 ± 0.72) × 10 −11 and B(K L → π 0 νν) = (3.00 ± 0.30) × 10 −11 , which is more precise than using averages of the present tree-level values of |V cb |, |V ub | and γ. Furthermore, we point out the correlation between B(K + → π + νν), B(B s → µ + µ − ) and γ within the SM, that is only very weakly dependent on other CKM parameters. Finally, we update the correlation of K L → π 0 νν with the ratio ε /ε in the SM taking the recent progress on ε /ε from lattice QCD and the large N approach into account.

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“…Therefore, once the CKM parameters |V cb |, |V ub | and γ will be precisely determined in tree-level decays, these two decays will offer excellent tests of the SM and constitute very powerful probes of NP. Reviews of these two decays can be found in [1,[76][77][78][79]. In particular in [80] bounds on K → πνν decays in correlation with the unitarity triangle and sin 2β within models with minimal flavour violation have been derived.…”

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confidence: 99%

The Return of Kaon Flavour Physics

Buras¹

2018

Acta Phys. Pol. B

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Kaon flavour physics has played in the 1960s and 1970s a very important role in the construction of the Standard Model (SM) and in the 1980s and 1990s in SM tests with the help of CP violation in K L → ππ decays represented by ε K and the ratio ε /ε. In this millennium this role has been taken over by B s,d and D mesons. However there is no doubt that in the coming years we will witness the return of kaon flavour physics with the highlights being the measurements of the theoretically clean branching ratios for the rare decays K + → π + νν and K L → π 0 νν and the improved SM predictions for the ratio ε /ε, for ε K and the K 0 −K 0 mixing mass difference ∆M K . Theoretical progress on the decays K L,S → µ + µ − and K L → π 0 + − is also expected. They all are very sensitive to new physics (NP) contributions and the correlations between them should help us to identify new dynamics at very short distance scales. These studies will be enriched when theory on the K → ππ isospin amplitudes ReA 0 and ReA 2 improves. This talk summarizes several aspects of this exciting field. In particular we emphasize the role of the Dual QCD approach in getting the insight into the numerical Lattice QCD results on K 0 −K 0 mixing and K → ππ decays.

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New Physics Signatures in Kaon Decays

Cited by 10 publications

References 32 publications

Towards the identification of new physics through quark flavour violating processes

Towards the identification of new physics through quark flavour violating processes

K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ and K L → π 0 ν ν ¯ $$ {K}_L\to {\pi}^0\nu \overline{\nu} $$ in the Standard Model: status and perspectives

The Return of Kaon Flavour Physics

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