Department of Physics and Astronomy: Publications and Other Research
Date of this Version
10-15-2004
Abstract
We report the observation of the X(3872) in the J/ψπ+π- channel, with J/ψ decaying to μ+μ-, in pp̅ collisions at √s = 1.96 TeV. Using approximately 230 pb-1 of data collected with the Run II D0 detector, we observe 522 ± 100 X(3872) candidates. The mass difference between the X(3872) state and the J=J/ψ is measured to be 774.9 ± 3.1(stat) ± 3.0(syst) MeV/c2. We have investigated the production and decay characteristics of the X(3872) and find them to be similar to those of the ψ(2S) state.
Comments
Published by American Physical Society. Phys. Rev. Lett. VOLUME 93, NUMBER 16. http://prl.aps.org. Copyright © 2004 American Physical Society. Used by permission.