Observation and Properties of the $X (3872)$ Decaying to $J / ψ π^{+} π^{-}$ in $p \bar{p}$ Collisions at $\sqrt{s} = 1.96 T e V$

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14 October 2004

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 93 (16) , 162002
https://doi.org/10.1103/physrevlett.93.162002

Abstract

We report the observation of the

X (3872)

in the

J / ψ π^{+} π^{-}

channel, with

J / ψ

decaying to

μ^{+} μ^{-}

, in

p \bar{p}

collisions at

\sqrt{s} = 1.96 T e V

. Using approximately

230 {p b}^{- 1}

of data collected with the Run II D0 detector, we observe

522 \pm 100

X (3872)

candidates. The mass difference between the

X (3872)

state and the

J / ψ

is measured to be

774.9 \pm 3.1 (s t a t) \pm 3.0 (s y s t) M e V / c^{2}

. We have investigated the production and decay characteristics of the

X (3872)

and find them to be similar to those of the

ψ (2 S)

state.

Keywords

ELEMENTARY PARTICLES

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This publication has 10 references indexed in Scilit:

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