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Measurement of the fraction of $\Upsilon(1S)$ originating from $\chi_b(1P)$ decays in $pp$ collisions at $\sqrt{s} = 7$ TeV

The LHCb collaboration
JHEP 1211 (2012) 031, 2012

Abstract (data abstract)
CERN-LHC. The production of $\chi_b(1P)$ mesons in $pp$ collisions at $\sqrt{s}$ = 7 TeV is studied using $32$ pb$^{-1}$ of data collected with the LHCb detector. The $\chi_b(1P)$ mesons are reconstructed in the decay mode $\chi_b(1P) \to \Upsilon(1S) \gamma \to \mu \mu \gamma$. The fraction of $\Upsilon(1S)$ originating from $\chi_b(1P)$ decays in the $\Upsilon(1S)$ transverse momentum range $6 < p_T^{\Upsilon(1S)} < 15$ GeV/c and rapidity range $2.0 < y^{\Upsilon(1S)} < 4.5$ is measured to be $(20.7\pm 5.7\pm 2.1^{+2.7}_{-5.4})~\%$, where the first uncertainty is statistical, the second is systematic and the last gives the range of the result due to the unknown $\Upsilon(1S)$ and $\chi_b(1P)$ polarizations.

  • Table 1

    Data from Figure 3; Table 1


    Fraction of $\Upsilon(1S)$ originating from $\chi_b(1P)$ decays for different $p_T(\Upsilon(1S))$ bins, assuming production of unpolarized $\Upsilon(1S)$ and $\chi_b(1P)$ mesons. The...

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