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

We report four narrow peaks in the $\Xi_b^0K^-$ mass spectrum obtained using$pp$ collisions at center-of-mass energies of 7, 8 and 13 TeV, corresponding toa total integrated luminosity of 9 fb$^{-1}$ recorded by the LHCb experiment.Referring to these states by their mass, the mass values are \begin{align*}m(\Omega_b(6316)^-) &= 6315.64\pm0.31\pm0.07\pm0.50 {\rm MeV}, \\m(\Omega_b(6330)^-) &= 6330.30\pm0.28\pm0.07\pm0.50 {\rm MeV}, \\m(\Omega_b(6340)^-) &= 6339.71\pm0.26\pm0.05\pm0.50 {\rm MeV}, \\m(\Omega_b(6350)^-) &= 6349.88\pm0.35\pm0.05\pm0.50 {\rm MeV},\end{align*}where the uncertainties are statistical, systematic and the last isdue to the knowledge of the $\Xi_b^0$ mass. The natural widths of the threelower mass states are consistent with zero, and the 90% confidence-level upperlimits are determined to be ${\Gamma(\Omega_b(6316)^-)<2.8}$ MeV,${\Gamma(\Omega_b(6330)^-)<3.1}$ MeV and ${\Gamma(\Omega_b(6340)^-)<1.5}$ MeV.The natural width of the $\Omega_b(6350)^-$ peak is $1.4^{+1.0}_{-0.8}\pm0.1$MeV, which is 2.5$\sigma$ from zero and corresponds to an upper limit of 2.8MeV. The peaks have local significances ranging from 3.6$\sigma$ to7.2$\sigma$. After accounting for the look-elsewhere effect, the significancesof the $\Omega_b(6316)^-$ and $\Omega_b(6330)^-$ peaks are reduced to2.1$\sigma$ and 2.6$\sigma$ respectively, while the two higher mass peaksexceed 5$\sigma$. The observed peaks are consistent with expectations forexcited $\Omega_b^-$ resonances.

First observation of excited $\Omega_b^-$ states