Determining 1<sup>−−</sup>heavy hybrid masses via QCD sum rules

Qiao, C. F.; Tang, Liang; Hao, Gang; Li, Xue–Qian

doi:10.1088/0954-3899/39/1/015005

Cited by 35 publications

(71 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[34]. We obtain four charmonium hybrid states with J P C = (0, 1, 2) −+ , 1 −− in the range 3.4 ∼ 3.9 GeV which are much lower than the other channels in Table I.…”

Section: Thementioning

confidence: 73%

“…To date, there is some evidence of the exotic light hybrid with J P C = 1 −+ [25][26][27][28]. For heavy quarkonium hybrids, which hereafter we shall refer to as heavy quark hybrids, calculations including the constituent gluon model [29], the flux tube model [10], QCD sum rules [30][31][32][33][34][35][36] and lattice QCD [6,[37][38][39][40][41] have been performed. The hybrid supermultiplet structures described above were confirmed for the heavy quark sector in lattice QCD [6] and the P-wave quasigluon approach [42].…”

Section: Introductionmentioning

confidence: 99%

“…The sum rules of some J P C channels were unstable and thus these mass predictions were unreliable. Recently, the J P C = 1 −− [34], 1 ++ [35] and 0 −+ [36] channels have been re-analyzed by including the dimension six tri-gluon condensate. The dimension six contributions have proven to be very important because they stabilize the hybrid sum rules and allow mass prediction to be made.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mass spectrum of heavy quarkonium hybrids

Chen

Kleiv

Steele

et al. 2013

J. High Energ. Phys.

View full text Add to dashboard Cite

We have extended the calculation of the correlation functions of heavy quarkonium hybrid operators with various J P C quantum numbers to include QCD condensates up to dimension six. In contrast to previous analyses which were unable to optimize the QCD sum-rules for certain J P C , recent work has shown that inclusion of dimension six condensates stabilizes the hybrid sum-rules and permits reliable mass predictions. In this work we have investigated the effects of the dimension six condensates on the remaining channels. After performing the QCD sum-rule analysis, we update the mass spectra of charmonium and bottomonium hybrids with exotic and non-exotic quantum numbers. We identify that the negative-parity states with J P C = (0, 1, 2) −+ , 1 −− form the lightest hybrid supermultiplet while the positive-parity states with J P C = (0, 1) +− , (0, 1, 2) ++ belong to a heavier hybrid supermultiplet, confirming the supermultiplet structure found in other approaches. The hybrid with J P C = 0 −− has a much higher mass which may suggest a different excitation of the gluonic field compared to other channels. In agreement with previous results, we find that the J P C = 1 ++ charmonium hybrid is substantially heavier than the X(3872), which seems to preclude a pure charmonium hybrid interpretation for this state.

show abstract

“…[34]. We obtain four charmonium hybrid states with J P C = (0, 1, 2) −+ , 1 −− in the range 3.4 ∼ 3.9 GeV which are much lower than the other channels in Table I.…”

Section: Thementioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mass spectrum of heavy quarkonium hybrids

Chen

Kleiv

Steele

et al. 2013

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…The mass of the charmonium hybrid meson was also studied in QCD sum rules in Ref. [737,738,739,740,741,742,743,744].…”

Section: The Hybrid Charmoniummentioning

confidence: 99%

“…However, in Ref. [795] [221,222], a hadrocharmonium state [760], a tetraquark state [512,796], a baryonium state [758,239], and a charmonium hybrid state [765,737].…”

Section: Other Theoretical Schemes Production and Decay Patternsmentioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

View full text Add to dashboard Cite

In the past decade many charmonium-like states were observed experimentally. Especially those charged charmoniumlike Z c states and bottomonium-like Z b states can not be accommodated within the naive quark model. These charged Z c states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states.

show abstract

Masses of open-flavour heavy-light hybrids from QCD sum-rules

Ho¹,

Harnett²,

Steele³

2017

J. High Energ. Phys.

View full text Add to dashboard Cite

We use QCD Laplace sum-rules to predict masses of open-flavour heavy-light hybrids where one of the hybrid's constituent quarks is a charm or bottom and the other is an up, down, or strange. We compute leading-order, diagonal correlation functions of several hybrid interpolating currents, taking into account QCD condensates up to dimensionsix, and extract hybrid mass predictions for all J P ∈ {0 ± , 1 ± }, as well as explore possible mixing effects with conventional quark-antiquark mesons. Within theoretical uncertainties, our results are consistent with a degeneracy between the heavy-nonstrange and heavystrange hybrids in all J P channels. We find a similar mass hierarchy of 1 + , 1 − , and 0 + states (a 1 + state lighter than essentially degenerate 1 − and 0 + states) in both the charm and bottom sectors, and discuss an interpretation for the 0 − states. If conventional meson mixing is present the effect is an increase in the hybrid mass prediction, and we estimate an upper bound on this effect.

show abstract

Determining 1⁻⁻heavy hybrid masses via QCD sum rules

Cited by 35 publications

References 66 publications

Mass spectrum of heavy quarkonium hybrids

Mass spectrum of heavy quarkonium hybrids

The hidden-charm pentaquark and tetraquark states

Masses of open-flavour heavy-light hybrids from QCD sum-rules

Contact Info

Product

Resources

About

Determining 1−−heavy hybrid masses via QCD sum rules

Cited by 35 publications

References 66 publications

Mass spectrum of heavy quarkonium hybrids

Mass spectrum of heavy quarkonium hybrids

The hidden-charm pentaquark and tetraquark states

Masses of open-flavour heavy-light hybrids from QCD sum-rules

Contact Info

Product

Resources

About

Determining 1⁻⁻heavy hybrid masses via QCD sum rules