Harland-Lang, LA;
Khoze, VA;
Ryskin, MG;
Shuvaev, AG;
(2017)
chi(c) decays and the gluon component of the eta ', eta mesons.
Physics Letters B
, 770
pp. 88-92.
10.1016/j.physletb.2017.04.046.
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Abstract
The large mass of the η′ meson indicates that a sizeable gluon component is present in the meson wave function. However, the χc0 and χc2 decays to η′ mesons, which proceed via a purely gluonic intermediate state and we would therefore naïvely expect to be enhanced by such a component, are in fact relatively suppressed. We argue that this apparent contradiction may be resolved by a proper treatment of interference effects in the decay. In particular, by accounting for the destructive interference between the quark and gluon components of the η′ distribution function, in combination with a model for strange quark mass effects, we demonstrate that the observed χc(0,2)→η(′)η(′) branching ratios can be reproduced for a reasonable gluon component of the η′, η mesons.
| Type: | Article |
|---|---|
| Title: | chi(c) decays and the gluon component of the eta ', eta mesons |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.physletb.2017.04.046 |
| Publisher version: | http://dx.doi.org/10.1016/j.physletb.2017.04.046 |
| Additional information: | © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Nuclear, Physics, Particles & Fields, Physics, WAVE QUARKONIUM DECAYS, FORM-FACTORS, QUANTUM CHROMODYNAMICS, EXCLUSIVE PROCESSES, PSEUDOSCALAR MESONS, QCD CORRECTIONS, HEAVY MESONS, U(1) PROBLEM, SYMMETRY, STATES |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1568327 |
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