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

Harland-Lang, L.A.; Khoze, V.A.; Ryskin, M.G.; Shuvaev, A.G.

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L.A. Harland-Lang

V.A. Khoze

M.G. Ryskin

A.G. Shuvaev


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.


Harland-Lang, L., Khoze, V., Ryskin, M., & Shuvaev, A. (2017). χc decays and the gluon component of the η′, η mesons. Physics Letters B, 770, 88-92.

Journal Article Type Article
Acceptance Date Apr 20, 2017
Online Publication Date Apr 26, 2017
Publication Date Jul 10, 2017
Deposit Date Jul 6, 2017
Publicly Available Date Jul 6, 2017
Journal Physics Letters B
Print ISSN 0370-2693
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 770
Pages 88-92


Published Journal Article (290 Kb)

Publisher Licence URL

Copyright Statement
© 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license<br /> ( Funded by SCOAP3.

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