Rare K- (vs.) B-decays

Haisch, Ulrich

doi:10.22323/1.046.0056

Cited by 3 publications

(2 citation statements)

References 37 publications

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“…The theoretical uncertainty on the branching fraction of the charged and neutral modes is dominated by knowledge of the CKM matrix. In the case of K + → π + νν this is 33%, and for K 0 L → π 0 νν this is 52% [435]. With the current knowledge of the CKM mechanism a measurement of either of these modes would provide another constraint on the SM, however with a precision over-constraint of the CKM mechanism from SuperB, then these kaon branching fractions would be sensitive probes of new physics via loop amplitudes in analogy with the discussions in Section 3 for the study of rare B decays.…”

Section: Littlest Higgs Model With T-paritymentioning

confidence: 97%

SuperB Progress Report for Physics

O’Leary¹,

Aachen²,

Matias³

et al. 2012

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SuperB is a high luminosity e + e − collider that will be able to indirectly probe new physics at energy scales far beyond the reach of any man made accelerator planned or in existence. Just as detailed understanding of the Standard Model of particle physics was developed from stringent constraints imposed by flavour changing processes between quarks, the detailed structure of any new physics is severely constrained by flavour processes. In order to elucidate this structure it is necessary to perform a number of complementary studies of a set of golden channels. With these measurements in hand, the pattern of deviations from the Standard Model behavior can be used as a test of the structure of new physics. If new physics is found at the LHC, then the many golden measurements from SuperB will help decode the subtle nature of the new physics. However if no new particles are found at the LHC, SuperB will be able to search for new physics at energy scales up to 10 − 100 TeV. In either scenario, flavour physics measurements that can be made at SuperB play a pivotal role in understanding the nature of physics beyond the Standard Model. Examples for using the interplay between measurements to discriminate New Physics models are discussed in this document.SuperB is a Super Flavour Factory, in addition to studying large samples of B u,d,s , D and τ decays, SuperB has a broad physics programme that includes spectroscopy both in terms of the Standard Model and exotica, and precision measurements of sin 2 θ W . In addition to performing CP violation measurements at the Υ (4S) and φ(3770), SuperB will test CP T in these systems, and lepton universality in a number of different processes. The multitude of rare decay measurements possible at SuperB can be used to constrain scenarios of physics beyond the Standard Model. In terms of other precision tests of the Standard Model, this experiment will be able to perform precision over-constraints of the unitarity triangle through multiple measurements of all angles and sides.

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Section: Littlest Higgs Model With T-paritymentioning

confidence: 97%

SuperB Progress Report for Physics

O’Leary¹,

Aachen²,

Matias³

et al. 2012

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show abstract

“…These effects are of considerable theoretical interest with respect to subtleties that can arise in nonperturbative dynamics, yet they go beyond it towards more pragmatic goals: they help to validate the goal of reducing the theoretical uncertainty in extracting |V cb | from B → X c ν to the 1% level; achieving such a goal is of obvious interest for the theoretical treatment of B decays -yet also for a proper interpretation of the ultra-rare decays K → π νν. Their amplitudes have been calculated with high accuracy in terms of m c and V * ts V td [13]. Their widths thus scale with V 4 cb , and the error on the latter is at least a large component in the stated overall 2% uncertainty.…”

Section: Discussionmentioning

confidence: 93%

The two roads to ‘Intrinsic Charm’ in B decays

Bigi

Mannel

Turczyk

et al. 2010

J. High Energ. Phys.

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We describe two complementary ways to show the presence of higher order effects in the 1/m Q expansion for inclusive B decays that have been dubbed 'Intrinsic Charm'. Apart from the lessons they can teach us about QCD's nonperturbative dynamics their consideration is relevant for precise extractions of |V cb |: for they complement the estimate of the potential impact of 1/m 4 Q contributions. We draw semiquantitative conclusions for the expected scale of Weak Annihilation in semileptonic B decays, both for its valence and non-valence components.

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Light quark loops in $$ {K}^{\pm}\to {\pi}^{\pm}\nu \overline{\nu} $$ from vector meson dominance and update on the Kaon Unitarity Triangle

Lunghi,

Soni

2024

J. High Energ. Phys.

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We use vector meson dominance to calculate non-perturbative contributions to the branching ratio of the rare decay $$ {K}^{\pm}\to {\pi}^{\pm}\nu \overline{\nu} $$ K ± → π ± ν ν ¯ stemming from matrix elements involving up-quark loops. The importance of this observable as well as of K0 → π0l+l− and of the direct CP violation parameter $$ {\epsilon}_K^{\prime } $$ ϵ K ′ is then discussed in the context of a Unitarity Triangle sqtudy based on Kaon sector observables only.

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Rare K- (vs.) B-decays

Cited by 3 publications

References 37 publications

SuperB Progress Report for Physics

SuperB Progress Report for Physics

The two roads to ‘Intrinsic Charm’ in B decays

Light quark loops in $$ {K}^{\pm}\to {\pi}^{\pm}\nu \overline{\nu} $$ from vector meson dominance and update on the Kaon Unitarity Triangle

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