K +→π + π 0 e + e −: a novel short-distance probe

Cappiello, Luigi; Catà, Óscar; D’Ambrosio, Giancarlo; Gao, Dao-Neng

doi:10.1140/epjc/s10052-012-1872-x

Cited by 44 publications

(87 citation statements)

References 39 publications

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“…4, obtained at q 2 = 50 MeV. Also several short distance observables (Fig.6) can be measured by appropriate kinematical analyses [32,33]. The big news is that NA62 has reported a measurement…”

Section: K → ππγ and K → ππEe-decaysmentioning

confidence: 96%

“…We computed the large long distance contributions and the relatively small short distance ones in Ref. [32,33], see in Fig.5 the size of the different LD contributions. Relatively to the K ± → π ± π 0 γ the possibility to go kinematically at large q 2 opens the possibility to beat the bremsstrahlung (Fig.5): at large dilepton invariant mass the bremsstrahlung can be even 100 time smaller than the magnetic contribution, however at the price of decreasing the statistics.…”

Section: K → ππγ and K → ππEe-decaysmentioning

confidence: 99%

“…× 10 −6 the external error comes from Dalitz decays π 0 → e + e − γ A good way to detect short distance physics in K L,S → π + π − l + l − or K ± → π ± π 0 l + l − is to measure the interference with axial leptonic current (see refs. in [32]): various diplane angular…”

Section: Rare Kaon Decay: Challenges and Perspectivesmentioning

confidence: 99%

“…Giancarlo D'Ambrosio asymmetries have been studied to this purpose [32] and this possibility possibly opens new directions to disentangle short distance from long distance.…”

Section: Rare Kaon Decay: Challenges and Perspectivesmentioning

confidence: 99%

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Rare kaon decay: challenges and perspectives

D’Ambrosio¹

2016

Proceedings of Flavor Physics &Amp; CP Violation 2015 — PoS(FPCP2015)

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I review rare kaon decays. I introduce the flavor problem and possible solutions. Very rare kaon decays like K → πνν are very important to this purpose but also K → πl + l − . A new interesting channel is K → ππee. Chiral dynamics is important to disentangle short distance effects. We discuss also the decays K 0 → µ + µ − , which have received recently some attention due to the measurement by LHCB.therefore we will study also K L → π 0 e + e − , K + → π + π 0 γ, K + → π + π 0 e + e − and related channels

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Section: K → ππγ and K → ππEe-decaysmentioning

confidence: 96%

Section: K → ππγ and K → ππEe-decaysmentioning

confidence: 99%

Section: Rare Kaon Decay: Challenges and Perspectivesmentioning

confidence: 99%

“…Giancarlo D'Ambrosio asymmetries have been studied to this purpose [32] and this possibility possibly opens new directions to disentangle short distance from long distance.…”

Section: Rare Kaon Decay: Challenges and Perspectivesmentioning

confidence: 99%

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Rare kaon decay: challenges and perspectives

D’Ambrosio¹

2016

Proceedings of Flavor Physics &Amp; CP Violation 2015 — PoS(FPCP2015)

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“…The traditional kinematical variables for the four body kaon semileptonic decay allow to write the four body phase space Φ in terms of the two two-body phase spaces: Φ π and Φ from [26,27]. We extend the K e4 kinematical and dynamical description of the amplitude to describe the K → ππe + e − decays; in particular we write the long distance contribution as…”

Section: Is Defined In This Equation) We Can Study the Deviation Frommentioning

confidence: 99%

Theory of rare $K$ decays

D’Ambrosio¹

2017

Proceedings of 9th International Workshop on the CKM Unitarity Triangle — PoS(CKM2016)

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Standard Model prediction and new physics tests for $ {D^0}\to h_1^{+}h_2^{-}{\ell^{+}}{\ell^{-}}\left( {h=\pi, K;\ell =e,\mu } \right) $

Cappiello

Catà

D’Ambrosio

2013

J. High Energ. Phys.

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Motivated by the recent evidence for direct CP-violation in D 0 → h + h − decays, we provide an exhaustive study of both Cabibbo-favored and Cabibbo-suppressed (singly and doubly)In particular, we study the Dalitz plot for the long-distance contributions in the (m 2 ll , m 2 hh ) parameter space. We find that near-resonant effects, i.e., D 0 → V (hwith V = ρ, K * , φ, are sizeable and even dominant (over Bremsstrahlung) for the µ + µ − decay modes, bringing the branching ratios close to the LHCb reach. We also provide a detailed study of the angular asymmetries for such decays and identify signatures for new physics detection. In particular, new physics signals can be neatly isolated in asymmetries involving the semileptonic operator Q10, where for typical new physics scenarios the effects can be as sizeable as O(1%) for the doubly Cabibbo-suppressed modes.

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K +→π + π 0 e + e −: a novel short-distance probe

Cited by 44 publications

References 39 publications

Rare kaon decay: challenges and perspectives

Rare kaon decay: challenges and perspectives

Theory of rare $K$ decays

Standard Model prediction and new physics tests for $ {D^0}\to h_1^{+}h_2^{-}{\ell^{+}}{\ell^{-}}\left( {h=\pi, K;\ell =e,\mu } \right) $

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