Measurement of the fraction of γ(1S) originating from χb(1P) decays in pp collisions at √s = 7TeV

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doi:10.1007/JHEP11(2012)031

The production of χb(1P) mesons in pp collisions at a centre-of-mass energy of 7TeV is studied using 32 pb -1 of data collected with the LHCb detector. The χb(1P) mesons are reconstructed in the decay mode χb(1P) → γ(1S)γ → μ +μ -γ. The fraction of γ(1S) originating from χb(1P) decays in the γ(1S) transverse momentum range 6 < pT γ(1S) < 15GeV/c and rapidity range 2.0 < y γ(1S) < 4.5 is measured to be (20.7 ± 5.7 ± 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 γ(1S) and χb(1P) polarizations. Open Access, Copyright CERN.

Aaij, R., Abellan Beteta, C., Adametz, A., Adeva, B., Adinolfi, M., Adrover, C., et al. (2012). Measurement of the fraction of γ(1S) originating from χb(1P) decays in pp collisions at √s = 7TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2012(11) [10.1007/JHEP11(2012)031].