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

The $\Theta^+$ pentaquark baryon was searched for via the $\pi^-p\to K^-X$reaction in a missing-mass resolution of 1.4 MeV/$c^2$(FWHM) at J-PARC. $\pi^-$meson beams were incident on the liquid hydrogen target with the beam momentumof 1.92 GeV/$c$. No peak structure corresponding to the $\Theta^+$ mass wasobserved. The upper limit of the production cross section averaged over thescattering angle of 2$^{\circ}$ to 15$^{\circ}$ in the laboratory frame wasobtained to be 0.26 $\mu$b/sr in the mass region of 1.51$-$1.55 GeV/$c^2$.Theupper limit of the $\Theta^+$ decay width using the effective Lagrangianapproach was obtained to be 0.72 MeV/$c^2$ and 3.1 MeV/$c^2$ for$J^P_{\Theta}=1/2^+$ and $J^P_{\Theta}=1/2^-$, respectively.

Search for the $\Theta^{+}$ pentaquark via the $\pi^-p\to K^-X$ reaction at 1.92 GeV/$c$