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/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Exclusive production of $\eta\pi^-$ and $\eta'\pi^-$ has been studied with a$191\,\textrm{GeV}/c$ $\pi^-$ beam impinging on a hydrogen target at COMPASS(CERN). Partial-wave analyses reveal different odd/even angular momentum ($L$)characteristics in the inspected invariant mass range up to$3\,\textrm{GeV}/c^2$. A striking similarity between the two systems isobserved for the $L=2,4,6$ intensities (scaled by kinematical factors) and therelative phases. The known resonances $a_2(1320)$ and $a_4(2040)$ are in linewith this similarity. In contrast, a strong enhancement of $\eta'\pi^-$ over$\eta\pi^-$ is found for the $L=1,3,5$ waves, which carry non-$q\bar q$ quantumnumbers. The $L=1$ intensity peaks at $1.7\,\textrm{GeV}/c^2$ in $\eta'\pi^-$and at $1.4\,\textrm{GeV}/c^2$ in $\eta\pi^-$, the corresponding phase motionswith respect to $L=2$ are different.

Odd and Even Partial Waves of $\eta\pi^-$ and $\eta'\pi^-$ in $\pi^-p\to\eta^{(\prime)}\pi^-p$ at $191\,\textrm{GeV}/c$