Compact Muon Solenoid
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| CMS-BPH-13-003 ; CERN-PH-EP-2013-140 | ||
| Measurement of the prompt $ \mathrm{J}/\psi $ and $ \psi \mathrm{ (2S) } $ polarizations in pp collisions at $ \sqrt{s} $ = 7 TeV | ||
| CMS Collaboration | ||
| 23 July 2013 | ||
| Phys. Lett. B 727 (2013) 381-402 | ||
| Abstract: The polarizations of prompt $ \mathrm{J}/\psi $ and $ \psi \mathrm{ (2S) } $ mesons are measured in proton-proton collisions at $ \sqrt{s} $ = 7 TeV, using a dimuon data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.9 inverse femtobarns. The prompt $ \mathrm{J}/\psi $ and $ \psi \mathrm{ (2S) } $ polarization parameters $ \lambda_{ \theta } $, $ \lambda_{ phi } $, $ \lambda_{ \theta, phi } $, as well as the frame-invariant quantity $ \tilde{ \lambda } $, are measured from the dimuon decay angular distributions in three different polarization frames. The $ \mathrm{J}/\psi $ results are obtained in the transverse momentum range 14 $ < p_{ \mathrm{ T } } < $ 70 GeV, in the rapidity intervals $ |y| < $ 0.6 and 0.6 $ < |y| < $ 1.2. The corresponding $ \psi \mathrm{ (2S) } $ results cover 14 $ < p_{ \mathrm{ T } } < $ 50 GeV and include a third rapidity bin, 1.2 $ < |y| < $ 1.5. No evidence of large transverse or longitudinal polarizations is seen in these kinematic regions, which extend much beyond those previously explored. | ||
| Links: e-print arXiv:1307.6070 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; Public twiki page ; HepData record ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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