Observation of the Narrow State X(3872) J/ψ π⁺ π^- in pp̅ Collisions at √s =1.96 TeV

Authors

Darin Acosta, University of Florida - GainesvilleFollow
Kenneth A. Bloom, University of Nebraska-LincolnFollow
Collider Detector at Fermilab Collaboration

Date of this Version

8-13-2004

Comments

Published by American Physical Society. Phys. Rev. Lett. 93, 072001 (2004). http://prl.aps.org. Copyright © 2004 American Physical Society. Permission to use.

Abstract

We report the observation of a narrow state decaying into J/ψ π⁺ π^- and produced in 220 pb^-1 of p̅p collisions at √s =1.96 TeV in the CDF II experiment. We observe 730±90 decays. The mass is measured to be 3871.3±0.7(stat)±0.4(syst) MeV/c², with an observed width consistent with the detector resolution. This is in agreement with the recent observation by the Belle Collaboration of the X(3872) meson.