Observation and Properties of the X(3872) Decaying to J/ψπ⁺π^- in pp̅ Collisions at √s = 1.96 TeV

Authors

• V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
• Gregory R. Snow, University of Nebraska-LincolnFollow
• D0 Collaboration

Document Type

Article

Date of this Version

10-15-2004

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.

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.