Measurement of the prompt J/ψ and ψ (2S) polarizations in pp collisions at √s = 7 TeV
The polarizations of prompt J/ψ and ψ(2S) mesons are measured in proton-proton collisions at √s = 7 TeV, using a dimuon data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.9 fb-1. The prompt J/ψ and ψ(2S) polarization parameters λθ, λφ, and λθφ, as...
| Autores: | , , , , , , , , , , , , , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2013 |
| País: | España |
| Institución: | Universidad de Cantabria (UC) |
| Repositorio: | UCrea Repositorio Abierto de la Universidad de Cantabria |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.unican.es:10902/25582 |
| Acceso en línea: | http://hdl.handle.net/10902/25582 |
| Access Level: | acceso abierto |
| Palabra clave: | CMS Physics Quarkonium production Quarkonium polarization |
| Sumario: | The polarizations of prompt J/ψ and ψ(2S) mesons are measured in proton-proton collisions at √s = 7 TeV, using a dimuon data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.9 fb-1. The prompt J/ψ and ψ(2S) polarization parameters λθ, λφ, and λθφ, as well as the frame-invariant quantity λ~, are measured from the dimuon decay angular distributions in three different polarization frames. The J/ψ results are obtained in the transverse momentum range 14<pT<70 GeV, in the rapidity intervals |y|<0.6 and 0.6<|y|<1.2. The corresponding ψ(2S) results cover 14<pT<50 GeV and include a third rapidity bin, 1.2<|y|<1.5. No evidence of large polarizations is seen in these kinematic regions, which extend much beyond those previously explored. |
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