Measurements of the Angular Distributions of Muons from Υ Decays in pp̅ Collisions at √s=1.96 TeV
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Aaltonen, Timo Antero; Amerio, Silvia; Amidei, Dante; Anastassov, Anton; Annovi, Alberto; Antos, Jaroslav; Apollinari, Giorgio; Appel, Jeffrey A.; Casal Laraña, Bruno; Cuevas Maestro, Francisco Javier; Gómez Gramuglio, Gervasio; Palencia Cortezón, José Enrique; Rodrigo Anoro, Teresa; Ruiz Jimeno, Alberto; Scodellaro, Luca; Vila Álvarez, Iván; Vilar Cortabitarte, Rocío; Vizán García, Jesús Manuel; Arisawa, Tetsuo; [et al.]Fecha
2012-04-11Derechos
© 2012 American Physical Society
Publicado en
Physical review letters, vol. 108, iss. 15, art. num. 151802 (2012)
Editorial
American Physical Society
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Resumen/Abstract
The angular distributions of muons from Υ(1S,2S,3S)→μ+μ- decays are measured using data from pp̅ collisions at √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 pT for Υ mesons in both the Collins-Soper and s-channel helicity frames. This is also the first measurement of the spin alignment of Υ(3S) mesons. Within the kinematic range of Υ rapidity |y|<0.6 and pT up to 40 GeV/c, the angular distributions are found to be nearly isotropic.
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