A bstract We discuss the construction of most general CP-violating chiral Lagrangian for an axion-like particle (ALP). Starting with effective containing light quarks and gluons, we provide its matching onto a at $$ \mathcal{O} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi> </mml:math> ( p 2 ) described in terms mesons baryons, identifying correspondence between Jarlskog invariants two theories. After deriving ALP interactions analyse few relevant...

We elaborate on the application of shell and unitarity-based methods for evaluating renormalization group coefficients, generalize this framework to account mixing operators with different dimensions leading mass effects. derive a master formula anomalous stemming from general structure operator mixings, up two-loop order, show how Higgs low-energy theorem can be exploited include A few applications properties popular effective field theories showcase strength proposed approach, which...

Beyond Standard Model scenarios addressing the flavor puzzle and hierarchy problem generally predict dominant new physics couplings with fermions of third generation. In this Letter, we explore collider astrophysical signatures light scalar pseudoscalar particles dominantly coupled to $\tau$-lepton. The best experimental prospects are expected at Belle II through $e^+e^-\to\tau^+\tau^-\gamma\gamma$, $\tau^+\tau^-\gamma$, $3\gamma$, mono-$\gamma$ processes, $\tau$ anomalous magnetic moment....

We consider the renormalization group equations of axion-like particle effective field theories and determine corresponding anomalous dimensions at one loop via on-shell unitarity-based methods. The calculation phase-space cut-integrals is carried out using different integration methods, among which double-cut Stokes' theorem proves to be technically simpler. A close comparison between standard Feynman diagrammatic approach method enables us explicitly verify reduction complexity in latter...

We discuss the construction of chiral Lagrangian for a light spin-1 boson, here denoted as $X$, featuring both vector and axial-vector couplings to $u,d,s$ quarks. Focusing on $\Delta S = 1$ transitions, we show that there are model-independent tree-level contributions $K^\pm \to \pi^\pm X$, sourced by Standard Model charged currents, which receive an $m^2_K / m_X^2$ enhancement from emission longitudinally polarized $X$. This flavour observable sets strongest date bound diagonal $X$ quarks...

In this work, we construct the chiral Lagrangian for a light spin-1 boson $X$ possessing both vectorial and axial couplings to Standard Model quarks $u, d, s$. We then use it in order describe tree-level, model-independent contributions $\Delta S = 1$ transition $K^\pm \rightarrow \pi^\pm X$, which is induced by charged currents possibly enhanced emission of longitudinally polarized boson. Such flavour observable shown set best bounds on diagonal mass range allowed decay kinematics,...

We discuss the construction of most general CP-violating chiral Lagrangian for an axion-like particle (ALP). Starting with effective containing light quarks and gluons, we provide its matching onto a at $\mathcal{O}(p^2)$ described in terms mesons baryons, identifying correspondence between Jarlskog invariants two theories. After deriving ALP interactions analyse few relevant phenomenological implications such as permanent electric dipole moments nucleons kaon decays.This work provides...

A bstract We discuss the construction of chiral Lagrangian for a light spin-1 boson, here denoted as X , featuring both vector and axial-vector couplings to u d s quarks. Focusing on ∆ S = 1 transitions, we show that there are model-independent tree-level contributions K ± → π sourced by Standard Model charged currents, which receive an $$ {m}_K^2/{m}_X^2 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>m</mml:mi> <mml:mi>K</mml:mi> <mml:mn>2</mml:mn>...

We elaborate on the application of on-shell and unitarity-based methods for evaluating renormalization group coefficients, generalize this framework to account mixing operators with different dimensions leading mass effects. derive a master formula anomalous stemming from general structure operator mixings, up two-loop order, show how Higgs low-energy theorem can be exploited include A few applications properties popular effective field theories showcase strength proposed approach, which...