Search for a Charged Partner of the X(3872) in the B Meson Decay B --> X- K, X- --> J/psi pi- pi0

TL;DR

This study searches for a charged partner of the X(3872) particle in B meson decays, setting upper limits on its production rate with no confirmed detection.

Contribution

First search for a charged X(3872) partner in B meson decays, providing upper limits on its branching fractions using a large dataset.

Findings

No evidence for the charged X(3872) partner was found.

Upper limits on branching fractions were established.

The results constrain models predicting charged partners of X(3872).

Abstract

We search for a charged partner of the X(3872) in the decay B --> X- K, X- --> J/psi pi- pi0, using 234 million BBbar events collected at the Y(4S) resonance with the BaBar detector at the PEP-II e+e- asymmetric-energy storage ring. The resulting product branching fraction upper limits are BR(B0 --> X- K+, X- --> J/psi pi- pi0) < 5.4 x 10(-6) and BR(B- --> X- K0bar,X- --> J/psi pi- pi0) < 22 x 10(-6) at the 90% confidence level.