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 production of $\chi_b$ mesons in proton-proton collisions is studiedusing a data sample collected by the LHCb detector, at centre-of-mass energiesof $\sqrt{s}=7$ and $8$ TeV and corresponding to an integrated luminosity of3.0 fb$^{-1}$. The $\chi_b$ mesons are identified through their decays to$\Upsilon(1S)\gamma$ and $\Upsilon(2S)\gamma$ using photons that converted to$e^+e^-$ pairs in the detector. The relative prompt production rate of$\chi_{b1}(1P)$ and $\chi_{b2}(1P)$ mesons is measured as a function of the$\Upsilon(1S)$ transverse momentum in the $\chi_b$ rapidity range $2.0<y<4.5$.A precise measurement of the $\chi_b(3P)$ mass is also performed. Assuming amass splitting between the $\chi_{b1}(3P)$ and the $\chi_{b2}(3P)$ states of10.5 MeV/$c^2$, the measured mass of the $\chi_{b1}(3P)$ meson is $m(\chi_{b1}(3P))= 10515.7^{+2.2}_{-3.9}(stat) ^{+1.5}_{-2.1}(syst) MeV/c^2.$

Measurement of the $\chi_b(3P)$ mass and of the relative rate of $\chi_{b1}(1P)$ and $\chi_{b2}(1P)$ production