The rare decay 
                
                  
                
                $K_{\mathrm{L}} \rightarrow\pi^{0} \mu^{ + } \mu^{-}$
               within the SM

Isidori, Gino; Smith, C.; Unterdorfer, Rene

doi:10.1140/epjc/s2004-01879-0

Cited by 70 publications

(68 citation statements)

References 64 publications

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“…Within CHPT, only the 0 ++ state is produced at LO through the finite two-loop process K L → π 0 P + P − → π 0 γ γ → π 0 + − (P = π, K). Higher-order corrections are estimated using K L → π 0 γ γ experimental data for both the 0 ++ and 2 ++ contributions [871,872].…”

Section: K L → π 0 + − In the Smmentioning

confidence: 99%

“…Also, better measurements of K L → π 0 γ γ would help in reducing the error on the 0 ++ and 2 ++ contributions. Alternatively, they can be partially cut away through energy cuts or Dalitz plot analyses [871,872,887]. As shown in Fig.…”

Section: K L → π 0 + − In the Smmentioning

confidence: 99%

“…This makes them an ideal probe of NP effects when taken in combination [872,887]. Moreover, K L → π 0 μ + μ − is sensitive to Higgs-induced helicity-suppressed operators, to which K → πνν (and K L → π 0 e + e − ) are blind.…”

Section: K Lmentioning

confidence: 99%

“…Still, the latter modes should not be disregarded as they offer the possibility to disentangle effects in the vector and axial-vector currents. Indeed, Q 7A produces the final lepton pair also in a helicity-suppressed 0 −+ state, hence contributes differently to K L → π 0 e + e − and K L → π 0 μ + μ − , while the Q 7V contributions are identical for both modes (up to phase-space corrections, and assuming lepton flavor universality) [872].…”

Section: Np With Sm Operatorsmentioning

confidence: 99%

“…The Although generated by very different dynamics, these three components are of comparable size and can be computed (or indirectly determined) to good accuracy within the SM [871,872]. In the presence of nonvanishing NP contributions, the combined measurements of K → πνν and K L → π 0 + − decays provide a unique tool to distinguish among different NP models.…”

Section: Introductionmentioning

confidence: 99%

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B, D and K decays

et al. 2008

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With the advent of the LHC, we will be able to probe New Physics (NP) up to energy scales almost one order of magnitude larger than it has been possible with present accelerator facilities. While direct detection of new particles will be the main avenue to establish the presence of NP at the LHC, indirect searches will provide precious complementary information, since most probably it will not be possible to measure the full spectrum of new particles and their couplings through direct production. In particular, precision measurements and computations in the realm of flavor physics are expected to play a key role in constraining the unknown parameters of the Lagrangian of any NP model emerging from direct searches at the LHC.The aim of Working Group 2 was twofold: on the one hand, to provide a coherent up-to-date picture of the status of flavor physics before the start of the LHC; on the other hand, to initiate activities on the path towards integrating information on NP from high-p T and flavor data.This report is organized as follows: in Sect. 1, we give an overview of NP models, focusing on a few examples that have been discussed in some detail during the workshop, with a short description of the available computational tools for flavor observables in NP models. Section 2 contains a concise discussion of the main theoretical problem in flavor physics: the evaluation of the relevant hadronic matrix elements for weak decays. Section 3 contains a detailed discussion of NP effects in a set of flavor observables that we identified as "benchmark channels" for NP searches. The experimental prospects for flavor physics at future facilities are discussed in Sect. 4. Finally, Sect. 5 contains some assessEur. Phys. J. C (2008) 57: 309-492 311 ments on the work done at the workshop and the prospects for future developments.

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Section: K L → π 0 + − In the Smmentioning

confidence: 99%

Section: K L → π 0 + − In the Smmentioning

confidence: 99%

Section: K Lmentioning

confidence: 99%

Section: Np With Sm Operatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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B, D and K decays

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B, D and K decays

Buchalla¹,

Komatsubara²,

Muheim³

et al. 2009

Flavor in the Era of the LHC

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The anatomy of Z ′ and Z with flavour changing neutral currents in the flavour precision era

Buras

Fazio

Girrbach

2013

J. High Energ. Phys.

113

255

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The simplest extension of the Standard Model (SM) that generally introduces new sources of flavour violation and CP violation as well as right-handed (RH) currents is the addition of a U (1) gauge symmetry to the SM gauge group. If the corresponding heavy gauge boson (Z ) mediates FCNC processes in the quark sector at tree-level, these new physics (NP) contributions imply a pattern of deviations from SM expectations for FCNC processes that depends only on the couplings of Z to fermions and on its mass. This implies stringent correlations between ∆F = 2 and ∆F = 1 observables which govern the landscape of the allowed parameter space for Z -models. Anticipating the Flavour Precision Era (FPE) ahead of us we illustrate this by searching for allowed oases in this landscape assuming significantly smaller uncertainties in CKM and hadronic parameters than presently available. To this end we analyze ∆F = 2 observables in K 0 −K 0 and B 0 s,d −B 0 s,d systems and rare K and B decays including both left-handed and right-handed Z -couplings to quarks in various combinations. We identify a number of correlations between various flavour observables that could test and distinguish these different Z scenarios. The important role of b → s + − and b → sνν transitions in these studies is emphasized. Imposing the existing flavour constraints, a rich pattern of deviations from the SM expectations in B s,d and K meson systems emerges provided M Z ≤ 3 TeV. While for M Z ≥ 5 TeV Z effects in rare B s,d decays are found typically below 10% and hard to measure even in the FPE, K → πνν and K L → π 0 + − decays provide an important portal to scales beyond those explored by the LHC. We apply our formalism to NP scenarios with induced flavour changing neutral Z-couplings to quarks. We find that in the case of B d and K decays such Z-couplings still allow for sizable departures from the SM. On the other hand in the B s system, constraints on b → s + − transitions basically eliminate NP effects from such couplings.

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The rare decay $K_{\mathrm{L}} \rightarrow\pi^{0} \mu^{ + } \mu^{-}$ within the SM

Cited by 70 publications

References 64 publications

B, D and K decays

B, D and K decays

B, D and K decays

The anatomy of Z ′ and Z with flavour changing neutral currents in the flavour precision era

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