  Differential cross sections as a function of transverse momentum pt are
presented for the production of Y(nS) (n = 1, 2, 3) states decaying into a pair
of muons. Data corresponding to an integrated luminosity of 4.9 inverse
femtobarns in pp collisions at sqrt(s) = 7 TeV were collected with the CMS
detector at the LHC. The analysis selects events with dimuon rapidity abs(y) <
1.2 and dimuon transverse momentum in the range 10 < pt < 100 GeV. The
measurements show a transition from an exponential to a power-law behavior at
pt ~ 20 GeV for the three Y states. Above that transition, the Y spectrum is
significantly harder than that of the Y(1S) and Y(2S). The ratios of the Y(3S)
and Y(2S) differential cross sections to the Y(1S) cross section show a rise as
pt increases at low pt, then become flatter at higher pt.
