Measurements of the production of P-wave charmonium states through radiative decays at the ATLAS experiment

0522707 - FZÚ 2020 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Marčišovský, Michal
Measurements of the production of P-wave charmonium states through radiative decays at the ATLAS experiment.
EPJ Web of Conferences. Vol. 71. Les Ulis: E D P Sciences, 2014 - (Bravina, L.; Foka, Y.; Kabana, S.), s. 1-8, č. článku 00082. ISSN 2100-014X.
[International Conference on New Frontiers in Physics /2./. Kolymbari (GR), 28.08.2013-05.09.2013]
Grant CEP: GA MŠMT(CZ) LG13009
Institucionální podpora: RVO:68378271
Klíčová slova: ATLAS * CERN LHC Coll * B+:branching ratio: measured
Obor OECD: Particles and field physics

The production cross sections of the chi_c1 and chi_c2 charmonium states are measured in pp collisions at s**(1/2) = 7 TeV using 4.5 fb^-1 of integrated luminosity recorded by the ATLAS detector at the LHC. The chi_c states are reconstructed via the radiative decay chi_c -> J/psi(mu^+mu^-)gamma, where the photons are reconstructed using gamma -> e^+ e^- conversion in the detector material. Differential production cross sections for prompt and non-prompt chi_c1,2 are presented, as well as the fraction of inclusive J/psi produced by feed-down from the chi_c states. The results are compared with a range of theoretical predictions. The branching fraction of ℬ (B^+ -> chi_c1K^+) is measured using the same dataset and chi_c event selection.

Trvalý link: http://hdl.handle.net/11104/0307157