Y(nS) polarizations versus particle multiplicity in pp collisions at sqrt(s) = 7 TeV
(2016) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. B761, p. 31-52 (2016)
Files
160302913.pdf
Open Access - Adobe PDF
- 1.36 MB
Details
- Authors
- Abstract
- The polarizations of the Y(1S), Y(2S), and Y(3S) mesons are measured as a function of the charged particle multiplicity in proton-proton collisions at sqrt(s) = 7 TeV. The measurements are performed with a dimuon data sample collected in 2011 by the CMS experiment, corresponding to an integrated luminosity of 4.9 inverse femtobarns. The results are extracted from the dimuon decay angular distributions, in two ranges of Y(nS) transverse momentum (10-15 and 15-35 GeV), and in the rapidity interval abs(y) < 1.2. The results do not show significant changes from low- to high-multiplicity pp collisions, although large uncertainties preclude definite statements in the Y(2S) and Y(3S) cases.
- Affiliations
Citations
CMS, Basegmez, S., Beluffi, C., Bondu, O., Brochet, S., Bruno, G., Caudron, A., Ceard, L., Delaere, C., Favart, D., Forthomme, L., Giammanco, A., Jafari, A., Jez, P., Komm, M., Lemaitre, V., Mertens, A., Musich, M., Nuttens, C., et al. (2016). Y(nS) polarizations versus particle multiplicity in pp collisions at sqrt(s) = 7 TeV. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, B761, 31-52. https://doi.org/10.1016/j.physletb.2016.07.065 (Original work published 2016)