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

LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Measurement of the $\Upsilon$(nS) polarizations in pp collisions at $\sqrt{s}$ = 7 and 8 TeV. Journal of High Energy Physics, 12:110.

## Abstract

The polarization of the $\Upsilon$(1S), $\Upsilon$(2S) and $\Upsilon$(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 $\Upsilon \to \mu\mu$ decays in the kinematic region of the transverse momentum $p_T^\Upsilon$  < 30 GeV/$c$ and rapidity 2.2 < $y^\Upsilon$ < 4.5. No large polarization is observed.

## Abstract

The polarization of the $\Upsilon$(1S), $\Upsilon$(2S) and $\Upsilon$(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 $\Upsilon \to \mu\mu$ decays in the kinematic region of the transverse momentum $p_T^\Upsilon$  < 30 GeV/$c$ and rapidity 2.2 < $y^\Upsilon$ < 4.5. No large polarization is observed.

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