In this work, we have conducted a comprehensive and systematic theoretical investigation of the full cascade decays of charged pseudoscalar mesons, specifically Ds, D, B, and Bc, into τντ, followed by the subsequent decay of the τ via its dominant experimentally reconstructible channels: τ → πντ, τ → ρντ, <InlineEquation ID="IEq2"> <EquationSource Format="MATHML"><math display="inline"> <mi>τ</mi> <mo>→</mo> <mi>e</mi> <msub> <mover accent="true"> <mi>ν</mi> <mo stretchy="true">¯</mo> </mover> <mi>e</mi> </msub> <msub> <mi>ν</mi> <mi>τ</mi> </msub> </math></EquationSource> <EquationSource Format="TEX">$ \tau \to e{\overline{\nu}}_e{\nu}_{\tau } $</EquationSource> </InlineEquation>, and <InlineEquation ID="IEq3"> <EquationSource Format="MATHML"><math display="inline"> <mi>τ</mi> <mo>→</mo> <mi>μ</mi> <msub> <mover accent="true"> <mi>ν</mi> <mo stretchy="true">¯</mo> </mover> <mi>μ</mi> </msub> <msub> <mi>ν</mi> <mi>τ</mi> </msub> </math></EquationSource> <EquationSource Format="TEX">$ \tau \to \mu {\overline{\nu}}_{\mu }{\nu}_{\tau } $</EquationSource> </InlineEquation>. Our study is framed within the model-independent low-energy effective field theory approach, which incorporates the most general set of four-fermion operators, including those coupling to right-handed neutrinos. We provide precise Standard Model predictions for differential decay rate as a function of the final-state charged particle energy, develop an innovative and robust methodology for extracting the magnitudes of the new physics couplings using energy moments, and identify and characterize fixed points in the normalized energy distributions. The fixed points are invariant under new physics contributions described by the considered effective Hamiltonian.

Pseudoscalar meson $ P\to \tau \left(\to \pi {\nu}_{\tau },\rho {\nu}_{\tau },\ell {\overline{\nu}}_{\ell }{\nu}_{\tau}\right){\overline{\nu}}_{\tau } $ decays in the Standard Model and beyond

期刊论文
出版模式：

开放获取
发表日期：

2026年6月1日

查看全文

Quan-Yi Hu

摘要

In this work, we have conducted a comprehensive and systematic theoretical investigation of the full cascade decays of charged pseudoscalar mesons, specifically D_s, D, B, and B_c, into τν_τ, followed by the subsequent decay of the τ via its dominant experimentally reconstructible channels: τ → πν_τ, τ → ρν_τ, $τ \to e {\bar{ν}}_{e} ν_{τ}$ $ \tau \to e{\overline{\nu}}_e{\nu}_{\tau } $ , and $τ \to μ {\bar{ν}}_{μ} ν_{τ}$ $ \tau \to \mu {\overline{\nu}}_{\mu }{\nu}_{\tau } $ . Our study is framed within the model-independent low-energy effective field theory approach, which incorporates the most general set of four-fermion operators, including those coupling to right-handed neutrinos. We provide precise Standard Model predictions for differential decay rate as a function of the final-state charged particle energy, develop an innovative and robust methodology for extracting the magnitudes of the new physics couplings using energy moments, and identify and characterize fixed points in the normalized energy distributions. The fixed points are invariant under new physics contributions described by the considered effective Hamiltonian.

Pseudoscalar meson \( P\to \tau \left(\to \pi {\nu}_{\tau },\rho {\nu}_{\tau },\ell {\overline{\nu}}_{\ell }{\nu}_{\tau}\right){\overline{\nu}}_{\tau } \) decays in the Standard Model and beyond

摘要