Baryonic currents and their correlators in the heavy quark effective theory

Grozin, Andrey; Yakovlev, O. I.

doi:10.1016/0370-2693(92)91462-i

Cited by 101 publications

(129 citation statements)

References 41 publications

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“…[299,300,301,302,49]. It can also be applied in the framework of heavy quark effective theory [303,304,305] to study heavy mesons [306,307,308,309,310,311,312,313,314,315,316,317] and heavy baryons [318,319,320,321,322,323,324,325,326,327,328,329].…”

Section: A Short Introduction To the Methods Of Qcd Sum Rulementioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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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.

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Section: A Short Introduction To the Methods Of Qcd Sum Rulementioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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“…For later use we also need the mass and overlapping amplitude of the Σ, Λ heavy baryon doublet,Λ Σc ,Λ Λc , f Σc , f Λc in the leading order of α s [21,22].Λ…”

Section: B the Interpolating Currentsmentioning

confidence: 99%

Strong and electromagnetic decays ofp-wave heavy baryonsΛc1,Λc1
Zhu
¹

2000
Phys. Rev. D
58
0
37
2
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We first calculate the binding energy, the pionic and electromagnetic couping constants of the lowest lying p-wave heavy baryon doublet Λ c1 , Λ * c1 in the leading order of the heavy quark expansion. Then we calculate the twobody decay widths with these couplings and compare our results with other approaches. Our results are Γ(Λ c1 → Σ c π, Σ c γ, Σ * c γ) = 2.7, 0.011, 0.001 MeV and Γ(Λ * c1 → Σ c π, Σ c γ, Σ * c γ, Λ c1 γ) = 33, 5, 6, 0.014 keV respectively. We find Λ c1 , Λ * c1 → Λ c γ is strictly forbidden in the leading order of the heavy quark expansion. At the order of O(1/m c ) their widths are 36, 48 keV respectively.

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“…Later on the methods of HQET were incorporated in the sum rule analysis. The leading order QCD sum rules for heavy baryons were first considered in [11,17,18], again to leading order both in 1/m Q as well as in α S . Finite mass corrections to these sum rules were discussed in [19].…”

Section: Introductionmentioning

confidence: 99%

QCD sum rules for heavy baryons at next-to-leading order in αS

1997

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We derive QCD sum rules for heavy baryons at leading order in 1/m Q and at next-to-leading order in α S . The calculation involves the evaluation of four different perturbative three-loop diagrams which determine the α S -corrections to the Wilson coefficients of the leading term in the Operator Product Expansion (OPE). From the sum rules we obtain estimates for the masses and the residues of the heavy baryons Λ Q and Σ Q . The perturbative O(α S ) corrections to the leading order spectral function amount to about 100%, and they shift the calculated values for the baryon masses slightly upward. The residues are shifted upward by about 20 − 50%. For the bound state energyΛ given by the difference of the heavy baryon mass and the pole mass of the heavy quark m Q we obtain m Λ Q − m Q ∼ = 780 MeV and m Σ Q − m Q ∼ = 950 MeV . For the residues we find |F Λ | ∼ = 0.028 GeV 3 and |F Σ | ∼ = 0.039 GeV

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Baryonic currents and their correlators in the heavy quark effective theory

Cited by 101 publications

References 41 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

Strong and electromagnetic decays ofp-wave heavy baryonsΛc1,Λc1
Zhu
¹

2000
Phys. Rev. D
58
0
37
2
View full text Add to dashboard Cite

QCD sum rules for heavy baryons at next-to-leading order in αS

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Baryonic currents and their correlators in the heavy quark effective theory

Cited by 101 publications

References 41 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

Strong and electromagnetic decays ofp-wave heavy baryonsΛc1,Λc1Zhu1 2000Phys. Rev. D580372View full textAdd to dashboardCite

QCD sum rules for heavy baryons at next-to-leading order in αS

Contact Info

Product

Resources

About

Strong and electromagnetic decays ofp-wave heavy baryonsΛc1,Λc1
Zhu
¹

2000
Phys. Rev. D
58
0
37
2
View full text Add to dashboard Cite