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A measurement of the production cross section ratio sigma(chi[b2](1P)) /sigma( chi[b1](1P)) is presented. The chi[b1](1P) and chi[b2](1P) bottomoniumstates, promptly produced in pp collisions at sqrt(s) = 8 TeV, are detected bythe CMS experiment at the CERN LHC through their radiative decays chi[b1,2](1P)to Upsilon(1S) + gamma. The emitted photons are measured through theirconversion to electron-positron pairs, whose reconstruction allows the twostates to be resolved. The Upsilon(1S) is measured through its decay to twomuons. An event sample corresponding to an integrated luminosity of 20.7inverse femtobarns is used to measure the cross section ratio in a phase-spaceregion defined by the photon pseudorapidity, abs(eta[gamma]) < 1.0; theUpsilon(1S) rapidity, abs(y[Upsilon]) < 1.5; and the Upsilon(1S) transversemomentum, 7 < pt[Upsilon] < 40 GeV. The cross section ratio shows nosignificant dependence on the Upsilon(1S) transverse momentum, with a measuredaverage value of 0.85 +/- 0.07 (stat+syst) +/- 0.08 (BF), where the firstuncertainty is the combination of the experimental statistical and systematicuncertainties and the second is from the uncertainty in the ratio of the chi[b]branching fractions.

Measurement of the production cross section ratio sigma(chi[b2](1P)) / sigma(chi[b1](1P)) in pp collisions at sqrt(s) = 8 TeV