Measurement of the Υ(1S), Υ(2S), and Υ(3S) Polarizations in pp Collisions at √s=7 TeV
- CMS Collaboration
- Chatrchyan, Serguei
- Bäni, Lukas
- Bortignon, Pierluigi
- Buchmann, Marco A.
- Casal, Bruno
- Chanon, Nicolas
- Deisher, Amanda
- Dissertori, Günther
- Dittmar, Michael
- Donegà, Mauro
- Dünser, Marc
- Eugster, Jürg
- Freudenreich, Klaus
- Grab, Christoph
- Hits, Dmitry
- Lecomte, Pierre
- Lustermann, Werner
- Marini, Andrea C.
- Martinez Ruiz del Arbol, Pablo
- Mohr, Niklas
- Moortgat, Filip
- Nägeli, Christoph
- Nef, Pascal
- Nessi-Tedaldi, Francesca
- Pandolfi, Francesco
- Pape, Luc
- Pauss, Felicitas
- Peruzzi, Marco
- Ronga, Frédéric J.
- Rossini, Marco
- Sala, Leonardo
- Sanchez, Ann-Karin
- Starodumov, Andrey
- Stieger, Benjamin
- Takahashi, Maiko
- Tauscher, Ludwig
- Thea, Alessandro
- Theofilatos, Konstantinos
- Treille, Daniel
- Urscheler, Christina
- Wallny, Rainer
- Weber, Hannsjörg A.
- Wehrli, Lukas
- et al.
Publication date
February 2013
DOI Publisher
American Physical Society (APS)Abstract
The polarizations of the Υ(1S), Υ(2S), and Υ(3S) mesons are measured in proton-proton collisions at √s=7 TeV, using a data sample of Υ(nS)→μ+μ− decays collected by the CMS experiment, corresponding to an integrated luminosity of 4.9 fb−1. The dimuon decay angular distributions are analyzed in three different polarization frames. The polarization parameters λϑ, λφ, and λϑφ, as well as the frame-invariant quantity ˜λ, are presented as a function of the Υ(nS) transverse momentum between 10 and 50 GeV, in the rapidity ranges |y|<0.6 and 0.6<|y|<1.2. No evidence of large transverse or longitudinal polarizations is seen in the explored kinematic region.ISSN:0031-9007ISSN:1079-711
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