Harland-Lang, L.A. and Khoze, V.A. and Ryskin, M.G. and Shuvaev, A.G. (2017) 'χc decays and the gluon component of the η′, η mesons.', Physics letters B., 770 . pp. 88-92.
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.
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|Publisher Web site:||https://doi.org/10.1016/j.physletb.2017.04.046|
|Publisher statement:||© 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.|
|Date accepted:||20 April 2017|
|Date deposited:||06 July 2017|
|Date of first online publication:||26 April 2017|
|Date first made open access:||06 July 2017|
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