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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We propose to search for a tetraquark candidate $X(ud\bar{s}\bar{s})$ in$pn\to \Lambda\Lambda X(ud\bar{s}\bar{s})\to \Lambda\Lambda K^+K^0$ or$\Lambda\Lambda KK^*$. The existence of tetraquark state $X(ud\bar{s}\bar{s})$with $J^P=0^+$, $1^-$ or $1^+$ was predicted in the literature based onspecific diquark effective degrees of freedom inside hadrons. In order tounderstand the underlying dynamics for exotic hadrons, a search for thetetraquark $X(ud\bar{s}\bar{s})$ is strongly recommended. The proposed reactioninvolves two $\Lambda$ production, of which the narrow widths make it a greatadvantage in the analysis of the final state missing mass spectrum. We make anestimate of the production rate of $X(ud\bar{s}\bar{s})$ in an effectiveLagrangian theory and find that for $J^P=1^-$ the sample events of $\sim 2200 \nb^{-1}$ will be able to identify $X(ud\bar{s}\bar{s})$ with five standarddeviations at a width of 10 MeV to $K^+K^0$ near threshold. For $J^P=1^+$ witha width of 20 MeV to $KK^*$, the sample events of $\sim 130 nb^{-1}$ will beneeded. Large production cross sections are expected in a kinematic regionbeyond the threshold. We emphasize the advantage of low background in thistransition channel, and in the meantime caution the large uncertainties in thepresent estimate due to lack of knowledge about the $X(ud\bar{s}\bar{s})$state. Implications for its heavy-flavored partners $qq\bar{c}\bar{c}$ and$qq\bar{b}\bar{b}$ are briefly discussed.

Search for a promising tetraquark candidate $X(ud\bar{s}\bar{s})$ in $pn\to \Lambda\Lambda X$