Measurements of Angular Distributions of Muons From $\Upsilon$ Meson Decays in $p\bar{p}$ Collisions at $\sqrt{s}=1.96$ TeV - INSPIRE

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Measurements of Angular Distributions of Muons From $\Upsilon$ Meson Decays in $p\bar{p}$ Collisions at $\sqrt{s}=1.96$ TeV

CDF

Collaboration

Dec, 2011

8 pages

Published in:

Phys.Rev.Lett. 108 (2012) 151802

e-Print:

1112.1591 [hep-ex]

DOI:

10.1103/PhysRevLett.108.151802

Report number:

FERMILAB-PUB-11-644-E

Experiments:

FNAL-E-0830

View in:

reference search78 citations

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Abstract: (arXiv)

The angular distributions of muons from Upsilon(1S,2S,3S) to mu+mu- decays are measured using data from proton anti-proton collisions at sqrt(s)=1.96 TeV corresponding to an integrated luminosity of 6.7 /fb 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 the Upsilon mesons in both the Collins-Soper and s-channel helicity frames. This is also the first measurement of spin alignment of Upsilon(3S) mesons. Within the kinematic range of Upsilon rapidity |y|<0.6 and pT up to 40 GeV/c, the angular distributions are found to be are nearly isotropic.

Note:

8 pages, 5 figures

13.85.Ni
13.20.Gd
14.40.Pq
muon: angular distribution
upsilon mesons: leptonic decay
spin: alignment
anti-p p: scattering
Batavia TEVATRON Coll
transverse momentum dependence
CDF

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Figures(5)

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