The angular distributions of muons from Y(1S, 2S, 3S) -> mu(+)mu(-) decays are measured using data from p (p) over bar collisions at root s = 1.96 TeV corresponding to an integrated luminosity of 6.7 fb(-1) and collected with the CDF II detector at the Fermilab Tevatron. This analysis is the first to report the full angular distributions as functions of transverse momentum p(T) for Y mesons in both the Collins-Soper and s-channel helicity frames. This is also the first measurement of the spin alignment of Y(3S) mesons. Within the kinematic range of Y rapidity |y| < 0.6 and p(T) up to 40 GeV/c, the angular distributions are found to be nearly isotropic.
|Titolo:||Measurements of the Angular Distributions of Muons from Y Decays in p(p)over-bar Collisions at root s=1.96 TeV|
|Citazione:||T., A., B., Á.G., S., A., D., A., A., A., A., A., et al. (2012). Measurements of the Angular Distributions of Muons from Y Decays in p(p)over-bar Collisions at root s=1.96 TeV. PHYSICAL REVIEW LETTERS, 108(15), 151802-1-151802-8.|
|Appare nelle tipologie:||1.1 Articolo in rivista|