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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Recently observed spectrum of $P_c$ states exhibits a strong link to$\Sigma_c \bar{D}^{(*)}$ thresholds. In spite of successful molecularinterpretations, we still push forward to wonder whether there exist finerstructures. Utilizing the effecitve lagrangians respecting heavy quark symmetryand chiral symmetry, as well as instantaneous Bethe-Salpeter equations, weinvestigate the $\Sigma_c \bar{D}^{(*)}$ interactions and three $P_c$ states.We confirm that $P_c(4312)$ and $P_c(4440)$ are good candidates of $\Sigma_c\bar{D}$ and $\Sigma_c \bar{D}^{*}$ molecules with spin-$\frac12$,respectively. Unlike other molecular calculations, our results indicate$P_c(4457)$ signal might be a mixture of spin-$\frac32$ and spin-$\frac12$$\Sigma_c \bar{D}^{*}$ molecules, where the latter one appears to be anexcitation of $P_c(4440)$. Therefore we conclude that, confronting three LHCb$P_c$ signals, there may exist not three, but four molecular states.

Recently observed $P_c$ as molecular states and possible mixture of $P_c(4457)$