Gluonic excitations of mesons: Why they are missing and where to find them

Isgur, Nathan; Kokoski, Richard J.; Paton, Jack E.

doi:10.1103/physrevlett.54.869

Cited by 278 publications

(270 citation statements)

References 8 publications

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“…If π 1 (1600) was an hybrid state, it was expected to be produced with a strength near or much larger than 10% of the a 2 (1320) meson from the theoretical models [22]. However π 1 (1600) was not observed with the expected strength.…”

Section: Introductionmentioning

confidence: 99%

IGJPC=1−1−+tetraquark states

2008

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We study the tetraquark states with I G J P C = 1 − 1 −+ in the QCD sum rule. After exhausting all possible flavor structures, we analyses both the SVZ and finite energy sum rules. Both approaches lead to a mass around 1.6 GeV for the state with the quark contents qqqq, and around 2.0 GeV for the state with the quark contents qsqs. The flavor structure (3 ⊗6) ⊕ (6 ⊗ 3) is preferred. Our analysis strongly indicates that both π1(1600) and π1 (2015) are also compatible with the exotic tetraquark interpretation, which are sometimes labeled as candidates of the 1 −+ hybrid mesons. Moreover one of their dominant decay modes is a pair of axial-vector and pseudoscalar mesons such as b1(1235)π, which is sometimes considered as the characteristic decay mode of the hybrid mesons.

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Section: Introductionmentioning

confidence: 99%

IGJPC=1−1−+tetraquark states

2008

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“…Up to now, a many of effective methods was proposed [1,2,3,4] in evaluating the hybrid mass spectrum, for instance, by studying the quarkonium hadronic transition via multipole expansion [5,6], the bag model [7], the flux-tube model [8], lattice QCD [9] and QCD Sum Rules [10,11,12,13,14,15,16,17,18]. Whereas, those theoretical evaluation results diverse greatly with each other, and hence it is hard to pin down any exotic structures as hybrids in experiment.…”

Section: Introductionmentioning

confidence: 99%

Determining 1⁻⁻heavy hybrid masses via QCD sum rules

Qiao¹,

Tang²,

Hao³

et al. 2011

J. Phys. G: Nucl. Part. Phys.

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The masses of 1 −− charmonium and bottomonium hybrids are evaluated in terms of QCD sum rules. We find that the ground state hybrid in charm sector lies in m Hc = 4.12 ∼ 4.79 GeV, while in bottom sector the hybrid may situated in m H b = 10.24 ∼ 11.15 GeV. Since the numerical result on charmonium hybrid mass is not compatible with the charmonium spectra, including structures newly observed in experiment, we tempt to conclude that such a hybrid does not purely exist, but rather as an admixture with other states, like glueball and regular quarkonium, in experimental observation. However, our result on bottomonium hybrid coincide with the "exotic structure" recently observed at BELLE.

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“…However, very little is still known about the direct excitation of the flux tube. The observation of such direct manifestations of gluonic degrees of freedom will provide understanding of confinement [4]. The quantum numbers of the flux tube, added to those of a qq meson, can produce exotic hybrids with unique J PC quantum numbers.…”

Section: Hall Dmentioning

confidence: 99%

Research perspectives at Jefferson lab: 12 GeV and beyond

Jager

2004

Nuclear Physics A

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Abstract. The plans for upgrading the CEBAF accelerator at Jefferson Lab to 12 GeV are presented. The research program supporting that upgrade are illustrated with a few selected examples. The instrumentation under design to carry out that research program is discussed. Finally, a conceptual design of a future upgrade which combines a 25 GeV fixed-target facility and an electron-ion collider facility at a luminosity of up to 10 35 cm 2 s 1 and a CM energy of over 40 GeV.

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Gluonic excitations of mesons: Why they are missing and where to find them

Cited by 278 publications

References 8 publications

IGJPC=1−1−+tetraquark states

IGJPC=1−1−+tetraquark states

Determining 1⁻⁻heavy hybrid masses via QCD sum rules

Research perspectives at Jefferson lab: 12 GeV and beyond

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Gluonic excitations of mesons: Why they are missing and where to find them

Cited by 278 publications

References 8 publications

IGJPC=1−1−+tetraquark states

IGJPC=1−1−+tetraquark states

Determining 1−−heavy hybrid masses via QCD sum rules

Research perspectives at Jefferson lab: 12 GeV and beyond

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Determining 1⁻⁻heavy hybrid masses via QCD sum rules