Measurements of the angular distributions of muons from Υ decays in pp collisions at sqrt[s] = 1.96  TeV

Physical Review Letters
T AaltonenCDF Collaboration

Abstract

The angular distributions of muons from Υ(1S,2S,3S) → μ+ μ- decays are measured using data from pp collisions at sqrt[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 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 p(T) up to 40  GeV/c, the angular distributions are found to be nearly isotropic.

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Sep 27, 2000·Physical Review Letters·T AffolderUNKNOWN CDF Collaboration
Apr 17, 2002·Physical Review Letters·D AcostaUNKNOWN CDF Collaboration
Aug 25, 2004·Physical Review Letters·D AcoustaUNKNOWN CDF Collaboration
Mar 21, 2008·Physical Review Letters·T AaltonenUNKNOWN CDF Collaboration
Jun 13, 2009·Physical Review Letters·Pietro FaccioliHermine K Wöhri
Sep 28, 2010·Physical Review Letters·Pietro FaccioliJoão Seixas

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Citations

Mar 12, 2016·Physical Review Letters·V M AbazovUNKNOWN D0 Collaboration
May 30, 2015·Physical Review Letters·V KhachatryanUNKNOWN CMS Collaboration
Mar 12, 2013·Physical Review Letters·S ChatrchyanUNKNOWN CMS Collaboration

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