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

LHCb Collaboration; Anderson, J; Bernet, R; Büchler-Germann, A; Bursche, A; Chiapolini, N; De Cian, M; Elsasser, C; Müller, K; Salzmann, C; Serra, N; Steinkamp, O; Straumann, U; Tobin, M; Vollhardt, A; et al (2012). Measurement of the fraction of $\Upsilon(1S)$ originating from $\chi_b(1P)$ decays in $pp$ collisions at $\sqrt{s} = 7$ TeV. Journal of High Energy Physics, 1211:031.