Anomalous triple gauge couplings from $B$-meson and kaon observables

TL;DR

This paper investigates how rare B-meson and kaon decays can constrain anomalous triple gauge couplings, providing competitive bounds compared to collider experiments and analyzing multiple observables for new physics effects.

Contribution

It introduces a detailed analysis of CP-conserving dimension-6 operators affecting triple gauge couplings using flavor observables, offering new constraints on anomalous couplings.

Findings

Rare B-meson decays constrain two anomalous couplings effectively.

Constraints from kaon decays and electroweak observables are also significant.

Flavor observables provide competitive bounds compared to collider data.

Abstract

We consider the three CP-conserving dimension-6 operators that encode the leading new-physics effects in the triple gauge couplings. The contributions to the standard-model electromagnetic dipole and semi-leptonic vector and axial-vector interactions that arise from the insertions of these operators are calculated. We show that radiative and rare $B$-meson decays provide, under certain assumptions, constraints on two out of the three anomalous couplings that are competitive with the restrictions obtained from LEP II, Tevatron and LHC data. The constraints arising from the $Z \to b \bar b$ electroweak pseudo observables, $K \to \pi \nu \bar \nu$ and $\epsilon^\prime/\epsilon$ are also studied.