$\Upsilon(nS)$ polarizations in $pp$ collisions at $\sqrt{s}=$ 7 and 8 TeV by the LHCb collaboration

Alexander Artamonov

$\Upsilon(nS)$ polarizations in $pp$ collisions at $\sqrt{s}=$ 7 and 8 TeV by the LHCb collaboration

High Energy Physics - Experiment 2017-11-15 v2

Authors: Alexander Artamonov

Abstract

A polarization measurement carried out for the $\Upsilon(1S)$ , $\Upsilon(2S)$ and $\Upsilon(3S)$ mesons produced in pp collisions at $\sqrt{s}=$ 7 and 8 TeV is presented. Data samples used for the polarization measurement were collected by the LHCb experiment during the 2011 and 2012 data taking runs with integrated luminosities of 1 and 2 fb $^{-1}$ , respectively. The measurement has been performed in three polarization frames, using an angular distribution analysis of the $\Upsilon\to\mu^{+}\mu^{-}$ decays in the kinematic region of the $\Upsilon$ transverse momentum $p_{T}^{\Upsilon}<30$ GeV/c and rapidity $2.2<y^{\Upsilon}<4.5$ . No large polarization is observed.

Keywords

upsilon polarization pp collisions lhc lhcb angular distribution muon decay

Cite

@article{arxiv.1711.02404,
  title  = {$\Upsilon(nS)$ polarizations in $pp$ collisions at $\sqrt{s}=$ 7 and 8 TeV by the LHCb collaboration},
  author = {Alexander Artamonov},
  journal= {arXiv preprint arXiv:1711.02404},
  year   = {2017}
}

Comments

Proceedings of XVII International Workshop on High Energy Spin Physics (DSPIN-17), Dubna, Russia, September 11 - 15, 2017; All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-028.html

$\Upsilon(nS)$ polarizations in $pp$ collisions at $\sqrt{s}=$ 7 and 8 TeV by the LHCb collaboration

Abstract

Keywords

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