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χc decays and the gluon component of the η′, η mesons.

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.

Item Type:Article
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Publisher statement:© 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( 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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