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

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

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.

Citation

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. https://doi.org/10.1016/j.physletb.2017.04.046

• 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
• Electronic ISSN: 1873-2445
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 770
• Pages: 88-92
• DOI: https://doi.org/10.1016/j.physletb.2017.04.046
• Public URL: https://durham-repository.worktribe.com/output/1355863