Experimental constraints on the possible J^PC quantum numbers of the X(3872)
Abstract
We examine possible J^PC quantum number assignments for the X(3872). Angular correlations between final state particles in X(3872) --> pi+pi- J/psi decays are used to rule out J^PC values of 0++ and 0-+. The shape of the pi+pi- mass distribution near its upper kinematic limit favors S-wave over P-wave as the relative orbital angular momentum between the final-state dipion and J/psi, which strongly disfavors 1-+ and 2-+ assignments. The accumulated evidence strongly favors a J^PC = 1++ assignment for the X(3872), although the 2++ possibility is not ruled out by tests reported here. The analysis is based on a sample of X(3872) mesons produced via the exclusive process B --> K X(3872) in a 256 fb-1 data sample collected at the Upsilon(4S) resonance in the Belle detector at the KEKB collider.
Cite
@article{arxiv.hep-ex/0505038,
title = {Experimental constraints on the possible J^PC quantum numbers of the X(3872)},
author = {K. Abe},
journal= {arXiv preprint arXiv:hep-ex/0505038},
year = {2019}
}
Comments
10 pages, 5 figures, submitted to Lepton-Photon 2005, Uppsala, Sweden, June 30-July 5, 2005