Central exclusive production as a probe of the gluonic component of the η′ and η mesons

被引：24

作者：

Harland-Lang, L. A. ^{[1
,2
]}

Khoze, V. A. ^{[1
,2
,3
]}

Ryskin, M. G. ^{[3
]}

Stirling, W. J. ^{[4
]}

机构：

[1] Univ Durham, Dept Phys, Durham DH1 3LE, England

[2] Univ Durham, Inst Particle Phys Phenomenol, Durham DH1 3LE, England

[3] NRC Kurchatov Inst, Petersburg Nucl Phys Inst, St Petersburg 188300, Russia

[4] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

EUROPEAN PHYSICAL JOURNAL C | 2013年 / 73卷 / 05期

关键词：

DOUBLE POMERON EXCHANGE; SYMMETRY-BREAKING; U(1); PHYSICS; HARD;

D O I：

10.1140/epjc/s10052-013-2429-3

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Currently, the long-standing issue concerning the size of the gluonic content of the eta and eta mesons remains unsettled. With this in mind we consider the central exclusive production (CEP) of eta' , eta meson pairs in the perturbative regime, applying the Durham pQCD-based model of CEP and the 'hard exclusive' formalism to evaluate the meson production subprocess. We calculate for the first time the relevant leading order parton-level processes gg -> q (q) over bar gg and gg -> gggg, where the final-state gg and q (q) over bar pairs form a pseudoscalar flavour-singlet state. We observe that these amplitudes display some non-trivial and interesting theoretical properties, and we comment on their origin. Finally, we present a phenomenological study, and show that the cross sections for the CEP of eta', eta meson pairs are strongly sensitive to the size of the gluon content of these mesons. The observation of these processes could therefore provide important and novel insight into this problem.

引用

页码：1 / 19

页数：19

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