Research Papers in Physics and Astronomy


Date of this Version

April 2002


Published by American Physical Society. Phys. Rev. Lett. 89, 041802 (2002). Copyright © 2002 American Physical Society. Permission to use.


We report on measurements of the ϒ(1S), ϒ(2S), and ϒ(3S) differential cross sections (d2σ/dpTdy)|y|<0.4, as well as on the ϒ(1S) polarization in pp̅ collisions at √s = 1.8 TeV using a sample of 77±3 pb-1 collected by the collider detector at Fermilab. The three resonances were reconstructed through the decay ϒ→μ+μ-. The measured angular distribution of the muons in the ϒ(1S) rest frame is consistent with unpolarized meson production.

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