Determinations of form factors for semileptonic $D\rightarrow K$ decays and leptoquark constraints

TL;DR

This paper analyzes all existing $D ightarrow K \, \ell^+ \nu_{\ell}$ decay measurements to determine form factors and CKM matrix elements, and uses these results to constrain scalar leptoquark models for new physics.

Contribution

It provides a comprehensive extraction of form factors and CKM matrix elements from experimental data and lattice calculations, and explores new physics constraints on scalar leptoquarks.

Findings

Determined $f_+^K(0)|V_{cs}|=0.7182\pm0.0029$

Extracted $|V_{cs}|=0.964\pm0.004\pm0.019$

Placed constraints on scalar leptoquarks in $D\rightarrow K$ decays.

Abstract

By analyzing all existing measurements for $ D\rightarrow K \ell^+ \nu_{\ell} $ ( $\ell=e,\ \mu$ ) decays, we find that the determinations of both the vector form factor $f_+^K(q^2)$ and scalar form factor $f_0^K(q^2)$ for semileptonic $D\rightarrow K$ decays from these measurements are feasible. By taking the parameterization of the one order series expansion of the $f_+^K(q^2)$ and $f_0^K(q^2)$, $f_+^K(0)|V_{cs}|$ is determined to be $0.7182\pm0.0029$, and the shape parameters of $f_+^K(q^2)$ and $f_0^K(q^2)$ are $r_{+1}=-2.16\pm0.007$ and $r_{01}=0.89\pm3.27$, respectively. Combining with the average $f_+^K(0)$ of $N_f=2+1$ and $N_f=2+1+1$ lattice calculaltion, the $|V_{cs}|$ is extracted to be $0.964\pm0.004\pm0.019$ where the first error is experimental and the second theoretical. Alternatively, the $f_+^K(0)$ is extracted to be $0.7377\pm0.003\pm0.000$ by taking the $|V_{cs}|$ as the value from the global fit with the unitarity constraint of the CKM matrix. Moreover, using the obtained form factors by $N_f=2+1+1$ lattice QCD, we re-analyze these measurements in the context of new physics. Constraints on scalar leptoquarks are obtained for different final states of semileptonic $D \rightarrow K$ decays.