English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Motivated by the recent developments in the determination of the experimentalvalues of the nucleon axial-vector coupling constant $g_A$ and the pion-nucleoncoupling constant $g_{\pi NN}$, we carry out a heavy-baryon chiral perturbationcalculation of the hyperfine-singlet $\mu p$ capture rate $\Gamma_0$ tonext-to-next-to-leading order (N$^2$LO), with the use of the latest values of$g_A$ and $g_{\pi NN}$. The calculated N$^2$LO value is $\Gamma_0^{\rmtheor}(\mu^- p \to \nu_\mu n) =718 \pm 7 \,s^{-1}$, where the estimated N$^3$LOcontribution dominates the error. This value is in excellent agreement with theexperimental value reported by the MuCap Collaboration.

The muon capture rate on hydrogen and the values of $g_A$ and $g_{\pi NN}$