PreprintarXiv licencearXiv
Implications of K→πνν̅ for new physics in B decays
Abstract
The new measurement of the K+→π+νν̅ branching ratio by the NA62 collaboration represents an important milestone in precision flavour physics. Under different flavour assumptions on beyond the standard model physics, this decay mode can be related to many other observables with underlying flavour-changing currents, such as B→ Kνν̅ or Bs→μμ, effectively providing an additional handle in our exploration of flavour-violating new physics effects. We study the impact of this new result, under the hypotheses that deviations from the standard model arise from modified Z couplings, or from effects in semileptonic interactions. Finally, we review the implications of our scenarios for the yet to be measured partner mode KL→π0νν̅.
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BibTeX
@misc{allwicher2026implications,
title = {{Implications of $K\toπν\barν$ for new physics in $B$ decays}},
author = {Lukas Allwicher and Marzia Bordone},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2607.24494},
eprint = {2607.24494},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.24494},
}
RIS
TY - UNPB
TI - Implications of K→πνν̅ for new physics in B decays
AU - Lukas Allwicher
AU - Marzia Bordone
PY - 2026
DA - 2026/09/04
PB - arXiv
DO - 10.48550/arxiv.2607.24494
UR - https://arxiv.org/abs/2607.24494
AB - The new measurement of the K^+→π^+νν̅ branching ratio by the NA62 collaboration represents an important milestone in precision flavour physics. Under different flavour assumptions on beyond the standard model physics, this decay mode can be related to many other observables with underlying flavour-changing currents, such as B→ Kνν̅ or B_s→μμ, effectively providing an additional handle in our exploration of flavour-violating new physics effects. We study the impact of this new result, under the hypotheses that deviations from the standard model arise from modified Z couplings, or from effects in semileptonic interactions. Finally, we review the implications of our scenarios for the yet to be measured partner mode K_L→π^0νν̅.
ER -