## Measurement of the $\Upsilon$ polarizations in $pp$ collisions at $\sqrt{s}$=7 and 8TeV

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Original language English Aaij:2017egv 110 Journal of High Energy Physics 1712 https://doi.org/10.1007/JHEP12(2017)110 Published - 20 Dec 2017

### Abstract

The polarization of the Y(1S), Y(2S) and Y(3S) mesons, produced in pp collisions at centre-of-mass energies $\sqrt{s}=7$ and 8 TeV, is measured using data samples collected by the LHCb experiment, corresponding to integrated luminosities of 1 and 2 fb$^{−1}$, respectively. The measurements are performed in three polarization frames, using Y → μμ decays in the kinematic region of the transverse momentum p$_{T}^{Υ}$