Observation and Properties of the X(3872) Decaying to J/psi pi+ pi- in p-p(bar) Collisions at sqrt(s) = 1.96 TeV

TL;DR

This paper reports the observation of the X(3872) particle decaying to J/psi pi+ pi- in proton-antiproton collisions at 1.96 TeV, measuring its mass difference and analyzing its properties.

Contribution

First observation of X(3872) in the J/psi pi+ pi- channel in proton-antiproton collisions at this energy, with detailed property measurements.

Findings

Detected 522 +/- 100 X(3872) candidates.

Measured mass difference as 774.9 +/- 3.1 (stat.) +/- 3.0 (syst.) MeV/c^2.

Found production and decay characteristics similar to psi(2S).

Abstract

We report the observation of the X(3872) in the J/psi pi+pi- channel, with J/psi decaying to mu+mu- in p-p(bar) collisions at sqrt(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/psi is measured to be 774.9 +/- 3.1 (stat.) +/- 3.0 (syst.) MeV/c^2. We have investigated the production and decay characteristics of the X(3872), and find them to be similar to those of the psi(2S) state.