Four sorts of meson

Bugg, D.V.

doi:10.1016/j.physrep.2004.03.008

Cited by 300 publications

(437 citation statements)

References 178 publications

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“…After many dormant years with essentially no incoming new data, a recent systematic partial wave analysis of thē pp annihilation at LEAR has revealed a lot of new meson states in the mass range 1.8 -2.4 GeV [8,9]. These new experimental results turned out to be in line with [7], while the higher two curves include the new experimental and theoretical states as described in the text.…”

supporting

confidence: 53%

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Update of the Hagedorn mass spectrum

2004

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We present an update of the Hagedorn hypothesis of the exponential growth of the number of hadronic resonances with mass. We use the newest available experimental data for the non-strange mesons and baryons, as well as fill in some missing states according to the observation that the high-lying states form chiral multiplets. The results show, especially for the case of the mesons, that the Hagedorn growth continues with the increasing mass, with the new states lining up along the exponential growth.

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supporting

confidence: 53%

“…This kind of chiral symmetry restoration implies that the excited hadron states fill out multiplets of the chiral U (2) L ×U (2) R group. Indeed, the newly discovered meson states [8,9] turned out to systematically fall into almost degenerate chiral multiplets with a few missing states yet to be discovered [13,14].…”

mentioning

confidence: 99%

Update of the Hagedorn mass spectrum

2004

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“…The identification of the glueball states in the hadron spectrum is one of the most exciting topics of hadron spectroscopy [11,12,13,14]. In the scalar sector of J P C = 0 ++ there are three candidates for the most low-lying mass glueball states as f 0 (1370), f 0 (1500) and f 0 (1710).…”

Section: X(1835) As a Lowest Mass Pseudoscalar Glueballmentioning

confidence: 99%

X(1835) as the lowest mass pseudoscalar glueball and proton spin problem

Kochelev

Min

2006

Physics Letters B

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We 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.

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“…Due to a substantial s-quark component it was treated also as the KK molecule [5]. Lattice simulations and experimental exploration seem confirm assumptions on the exotic nature of f 0 ð980Þ and some other hadrons [6][7][8][9]. Suggestions about a diquark-antidiquark structure of the light scalar mesons including f 0 ð980Þ one were made on the basis of new theoretical analysis in Refs.…”

Section: Introductionmentioning

confidence: 99%

New a1(1420) state: Structure, mass, and width

2018

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The structure, spectroscopic parameters and width of the resonance with quantum numbers J PC ¼ 1 þþ discovered by the COMPASS Collaboration and classified as the a 1 ð1420Þ meson are examined in the context of QCD sum rule method. In the calculations the axial-vector meson a 1 ð1420Þ is treated as a fourquark state with the diquark-antidiquark structure. The mass and current coupling of a 1 ð1420Þ are evaluated using QCD two-point sum rule approach. Its observed decay mode a 1 ð1420Þ → f 0 ð980Þπ, and kinematically allowed ones, namely a 1 → K ÃAE K ∓ , a 1 → K Ã0K0 and a 1 →K Ã0 K 0 channels are studied employing QCD sum rules on the light-cone. Our prediction for the mass of the a 1 ð1420Þ state m a 1 ¼ 1416

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Four sorts of meson

Cited by 300 publications

References 178 publications

Update of the Hagedorn mass spectrum

Update of the Hagedorn mass spectrum

X(1835) as the lowest mass pseudoscalar glueball and proton spin problem

New a1(1420) state: Structure, mass, and width

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