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Two-loop electroweak corrections for the Kπνν¯ decays

Joachim Brod, Martin Gorbahn, and Emmanuel Stamou
Phys. Rev. D 83, 034030 – Published 22 February 2011
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Abstract

The rare Kπνν¯ decays play a central role in testing the standard model and its extensions. Upcoming experiments plan to measure the decay rates with high accuracy. Yet, unknown higher-order electroweak corrections result in a sizeable theory error. We remove this uncertainty by computing the full two-loop electroweak corrections to the top-quark contribution Xt to the rare decays KLπ0νν¯, K+π+νν¯, and BXd,sνν¯ in the standard model. The remaining theoretical uncertainty related to electroweak effects is now far below 1%. Finally we update the branching ratios to find Br(KLπ0νν¯)=2.43(39)(6)×1011 and Br(K+π+νν¯)=7.81(75)(29)×1011. The first error summarizes the parametric, the second the remaining theoretical uncertainties.

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  • Received 8 November 2010

DOI:https://doi.org/10.1103/PhysRevD.83.034030

© 2011 American Physical Society

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Clues from a rare decay

Published 22 February 2011

An ideal place to look for new physics beyond the standard model is a rare particle decay, and new calculations are providing a highly accurate picture of what to expect.

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Authors & Affiliations

Joachim Brod1, Martin Gorbahn1,2, and Emmanuel Stamou1,2,3

  • 1Excellence Cluster Universe, Technische Universität München, Boltzmannstraße 2, D-85748 Garching, Germany
  • 2Institute for Advanced Study, Technische Universität München, Lichtenbergstraße 2a, D-85748 Garching, Germany
  • 3Physik-Department, Technische Universität München, James-Franck-Straße, D-85748 Garching, Germany

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Issue

Vol. 83, Iss. 3 — 1 February 2011

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