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Study of $\chi _{{\mathrm {b}}}$ meson production in $\mathrm {p}$ $\mathrm {p}$ collisions at $\sqrt{s}=7$ and $8{\mathrm {\,TeV}}$ and observation of the decay $\chi _{{\mathrm {b}}}\mathrm {(3P)} \rightarrow \Upsilon \mathrm {(3S)} {\gamma }$

The collaboration
Eur.Phys.J. C74 (2014) 3092, 2014

Abstract (data abstract)
CERN-LHC. A study of $\chi_{b}$ meson production at LHCb is performed on proton-proton collision data, corresponding to 3.0 fb$^{-1}$ of integrated luminosity collected at centre-of-mass energies $\sqrt{s}=$7 and 8 TeV. The fraction of $\Upsilon(nS)$ mesons originating from $\chi_{b}$ decays is measured as a function of the $\Upsilon$ transverse momentum in the rapidity range $2.0 < y^{\Upsilon} < 4.5$. The radiative transition of the $\chi_{b}(3P)$ meson to $\Upsilon(3S)$ is observed for the first time. The $\chi_{b1}(3P)$ mass is determined to be $m_{\chi_{b1}(3P)} = 10511.3 \pm 1.7 \pm 2.5$ MeV/$c^2$, where the first uncertainty is statistical and the second is systematic.

• #### Table 1

Data from T 5

10.17182/hepdata.70017.v1/t1

Fractions $R_{\Upsilon(1S)}^{\chi_{b}(mP)}$ in bins of $p_{\mathrm{T}}^{\Upsilon}$, measured for data collected at $\sqrt{s}= 7$ TeV.

• #### Table 2

Data from T 5

10.17182/hepdata.70017.v1/t2

Fractions $R_{\Upsilon(2S)}^{\chi_{b}(mP)}$ in bins of $p_{\mathrm{T}}^{\Upsilon}$, measured for data collected at $\sqrt{s}= 7$ TeV.

• #### Table 3

Data from T 5

10.17182/hepdata.70017.v1/t3

Fractions $R_{\Upsilon(3S)}^{\chi_{b}(mP)}$ in bins of $p_{\mathrm{T}}^{\Upsilon}$, measured for data collected at $\sqrt{s}= 7$ TeV.

• #### Table 4

Data from T 6

10.17182/hepdata.70017.v1/t4

Fractions $R_{\Upsilon(1S)}^{\chi_{b}(mP)}$ in bins of $p_{\mathrm{T}}^{\Upsilon}$, measured for data collected at $\sqrt{s}= 8$ TeV.

• #### Table 5

Data from T 6

10.17182/hepdata.70017.v1/t5

Fractions $R_{\Upsilon(1S)}^{\chi_{b}(mP)}$ in bins of $p_{\mathrm{T}}^{\Upsilon}$, measured for data collected at $\sqrt{s}= 8$ TeV.

• #### Table 6

Data from T 6

10.17182/hepdata.70017.v1/t6

Fractions $R_{\Upsilon(1S)}^{\chi_{b}(mP)}$ in bins of $p_{\mathrm{T}}^{\Upsilon}$, measured for data collected at $\sqrt{s}= 8$ TeV.