Dispersive treatment of [Formula omitted] and [Formula omitted]

Dispersive treatment of [Formula omitted] and [Formula omitted]

We analyse the rare kaon decays [Formula omitted] and [Formula omitted] [Formula omitted] in a dispersive framework in which the weak Hamiltonian carries momentum. Our analysis extends predictions from lowest order [Formula omitted] chiral perturbation theory ( [Formula omitted]PT [Formula omitted])...

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Veröffentlicht in:The European physical journal. C, Particles and fields Particles and fields, 2016-11, Vol.76 (11)
Hauptverfasser: Colangelo, Gilberto, Stucki, Ramon, Tunstall, Lewis C
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container_issue 11
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container_title The European physical journal. C, Particles and fields
container_volume 76
creator Colangelo, Gilberto
Stucki, Ramon
Tunstall, Lewis C
description We analyse the rare kaon decays [Formula omitted] and [Formula omitted] [Formula omitted] in a dispersive framework in which the weak Hamiltonian carries momentum. Our analysis extends predictions from lowest order [Formula omitted] chiral perturbation theory ( [Formula omitted]PT [Formula omitted]) to fully account for effects from final-state interactions, and is free from ambiguities associated with extrapolating the kaon off-shell. Given input from [Formula omitted] and [Formula omitted], we solve the once-subtracted dispersion relations numerically to predict the rates for [Formula omitted] and [Formula omitted]. In the leptonic modes, we find sizeable corrections to the [Formula omitted]PT [Formula omitted] predictions for the integrated rates.
doi_str_mv 10.1140/epjc/s10052-016-4449-2
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title Dispersive treatment of [Formula omitted] and [Formula omitted]
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