Meson Spectroscopy without Tetraquarks
High Energy Physics - Phenomenology
2011-01-18 v2 High Energy Physics - Experiment
Abstract
Data on e+e- -> piplus-piminus-Upsilon(1S,2S,3S) show a large increase in branching fractions near Upsilon(10860). A suggestion of Ali et al. is to interpret this as evidence for a tetraquark, Yb(10890) = b-bbar. However, it may also be interpreted in terms of Upsilon(10860) -> B-B*, B*B* and BsB*s above the open-b threshold, followed by de-excitation processes such as $BB* -> Upsilon (1S,2S,3S). In the charm sector, a hypothesis open to experimental test is that X,Y and Z peaks in the mass range 3872 to 3945 MeV may all be due to regular 3P1 and 3P2 c-cbar states (and perhaps 3P0) mixed with meson-meson.
Cite
@article{arxiv.1101.1659,
title = {Meson Spectroscopy without Tetraquarks},
author = {D. V. Bugg},
journal= {arXiv preprint arXiv:1101.1659},
year = {2011}
}
Comments
12 pages, 3 figures Some improvements in wording added