X(1835) as the Lowest Mass Pseudoscalar Glueball and Proton Spin Problem

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dc.creatorKochelev, Nikolai
dc.creatorMin, Dong-Pil
dc.date2005-08-29
dc.date2005-12-18
dc.date.accessioned2026-07-07T10:29:39Z
dc.date.available2026-07-07T10:29:39Z
dc.descriptionWe consider the parity doublet structure observed in high hadronic excitations within the instanton model for the QCD vacuum. In the conventional approach this doubling phenomenon is treated as a manifestation of the partial restoration of chiral or $U(1)_A$ symmetry. We demonstrate that the suppression of direct instanton contribution to the masses of excited hadrons leads to the partial $U(1)_A$ symmetry restoration in hadron spectrum. The origin of X(1835) resonance observed by BES Collaboration is studied upon the doublet structure. We argue also how X(1835) be interpreted as the lowest pseudoscalar glueball state, and derive its coupling constant to proton. It turns out that this coupling is large and negative. Demonstrated is how this large coupling affects the gluonic contribution to the proton spin.
dc.description12 pages, LaTex, 1 eps-figure, expanded discussion on mechanism of parity doubling in high hadronic excitations, version to appear in Phys.Lett.B
dc.identifierhttps://arxiv.org/abs/hep-ph/0508288
dc.identifierhttp://arxiv.org/abs/hep-ph/0508288
dc.identifierPhys.Lett.B633:283-288,2006
dc.identifierdoi:10.1016/j.physletb.2005.11.079
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177879
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.subjectNuclear Experiment
dc.subjectNuclear Theory
dc.titleX(1835) as the Lowest Mass Pseudoscalar Glueball and Proton Spin Problem
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