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

In a recent paper Phys.Rev. D98, 074023 (2018), the most up-to-dateexperimental data for all measured production and decay channels of thebottomonium-like states $Z_b(10610)$ and $Z_b(10650)$ were analysed in afield-theoretical coupled-channel approach which respects analyticity andunitarity and incorporates both the pion exchange as well as a short-rangedpotential nonperturbatively. All parameters of the interaction were fixeddirectly from data, and pole positions for both $Z_b$ states were determined.In this work we employ the same approach to predict in a parameter-free way thepole positions and the line shapes in the elastic and inelastic channels of the(still to be discovered) spin partners of the $Z_b$ states. They areconventionally referred to as $W_{bJ}$'s with the quantum numbers$J^{PC}=J^{++}$ ($J=0,1,2$). It is demonstrated that the results of our mostadvanced pionful fit, which gives the best $\chi^2/{\rm d.o.f.}$ for the datain the $Z_b$ channels, are consistent with all $W_{bJ}$ states beingabove-threshold resonances which manifest themselves as well pronounced humpstructures in the line shapes. On the contrary, in the pionless approach, all$W_{bJ}$'s are virtual states which can be seen as enhanced threshold cusps inthe inelastic line shapes. Since the two above scenarios provide differentimprints on the observables, the role of the one-pion exchange in the$B^{(*)}\bar{B}^{(*)}$ systems can be inferred from the once availableexperimental data directly.

Spin partners $W_{bJ}$ from the line shapes of the $Z_b(10610)$ and $Z_b(10650)$