scholarly journals Charm, bottom, strange baryon masses using QCD sum rules

2018 ◽  
Vol 33 (23) ◽  
pp. 1850139 ◽  
Author(s):  
Leonard S. Kisslinger ◽  
Bijit Singha
Keyword(s):  
Sum Rules ◽  
Qcd Sum Rules ◽  
Strange Baryon ◽  
Charm Baryon ◽  
Experimental Values ◽  
The Masses ◽  
Bottom Baryon

We use the method of QCD sum rules to estimate the masses of the charm baryon, [Formula: see text], bottom baryon [Formula: see text], strange baryon [Formula: see text] and compare them to their experimental values.

scholarly journals Charmed baryon decay to a strange baryon plus a pion using QCD sum rules

2019 ◽  
Vol 34 (03n04) ◽  
pp. 1950015 ◽  
Author(s):  
Leonard S. Kisslinger ◽  
Bijit Singha
Keyword(s):  
Sum Rules ◽  
Qcd Sum Rules ◽  
Charmed Baryons ◽  
Charmed Baryon ◽  
Strange Baryon ◽  
Weak Decays ◽  
Baryon Decay

This is an extension of the prediction of strange baryon decays to the decays of charmed baryons using QCD sum rules. Using QCD sum rules, we estimate the decay [Formula: see text]. Although some weak decays of the [Formula: see text] have been measured, since it is difficult to measure [Formula: see text] our estimates should be useful for future experiments.

scholarly journals Thermal Properties of Light Tensor Mesons via QCD Sum Rules

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
K. Azizi ◽  
A. Türkan ◽  
E. Veli Veliev ◽  
H. Sundu
Keyword(s):  
Thermal Properties ◽  
Finite Temperature ◽  
Sum Rules ◽  
Temperature Dependent ◽  
Qcd Sum Rules ◽  
Continuum Threshold ◽  
Decay Constants ◽  
Good Consistency ◽  
Theoretical Predictions ◽  
The Masses

The thermal properties off2(1270),a2(1320), andK2*(1430) light tensor mesons are investigated in the framework of QCD sum rules at finite temperature. In particular, the masses and decay constants of the light tensor mesons are calculated taking into account the new operators appearing at finite temperature. The numerical results show that, at the point at which the temperature-dependent continuum threshold vanishes, the decay constants decrease with amount of (70–85)% compared to their vacuum values, while the masses diminish about (60–72)% depending on the kinds of the mesons under consideration. The results obtained at zero temperature are in good consistency with the experimental data as well as the existing theoretical predictions.

scholarly journals Analysis of the heavy quarkonium states hc and hb with QCD sum rules

2014 ◽  
Vol 29 ◽  
pp. 1460233
Author(s):  
Zhi-Gang Wang ◽  
Shu-Yuan Guo
Keyword(s):  
Experimental Data ◽  
Sum Rules ◽  
P Wave ◽  
Heavy Quarkonium ◽  
Qcd Sum Rules ◽  
Decay Constants ◽  
Spin Singlet ◽  
Structure Formula ◽  
Quark Structure ◽  
The Masses

In this article, we take the tensor currents [Formula: see text] to interpolate the P-wave spin-singlet heavy quarkonium states hQ, and study the masses and decay constants with the Borel sum rules and moments sum rules. The masses and decay constants from the Borel sum rules and moments sum rules are consistent with each other, the masses are also consistent with the experimental data. The heavy quarkonium states hQ couple potentially to the tensor currents [Formula: see text], and have the quark structure ϵijkξ†σkζ besides the quark structure [Formula: see text].

scholarly journals Analysis of Radial Excitations of Octet Baryons in QCD Sum Rules

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
T. M. Aliev ◽  
S. Bilmis
Keyword(s):  
Ground State ◽  
Sum Rules ◽  
Qcd Sum Rules ◽  
Linear Combinations ◽  
The Masses ◽  
Good Agreement ◽  
Octet Baryons

Using the QCD sum rules method, we estimate the mass and residues of the first radial excitations of octet baryons. The contributions coming from the ground state baryons are eliminated by constructing the linear combinations of the sum rules corresponding to different Lorentz structures. Our predictions of the masses of the first radial excitations of octet baryons are in good agreement with the data.

scholarly journals The scalar and pseudoscalar hidden-charm tetraquark states with QCD sum rules

2018 ◽  
Vol 33 (14n15) ◽  
pp. 1850090
Author(s):  
Zun-Yan Di ◽  
Zhi-Gang Wang
Keyword(s):  
Experimental Data ◽  
Correlation Functions ◽  
Sum Rules ◽  
Qcd Sum Rules ◽  
Sum Rule ◽  
Rule Approach ◽  
Point Correlation ◽  
The Masses ◽  
Vacuum Condensates ◽  
Conserved Currents

Based on the diquark configuration, we construct the diquark–antidiquark interpolating tetraquark currents with [Formula: see text] and [Formula: see text], which can couple to the scalar and pseudoscalar tetraquark states, respectively, since they are not conserved currents. Then, we investigate their two-point correlation functions including the contributions of the vacuum condensates up to dimension-10 and extract the masses and pole residues of the tetraquark states with [Formula: see text] and [Formula: see text] through the QCD sum rule approach. The predicted masses can be confronted with the experimental data in the future. Moreover, we briefly discuss the possible decay patterns of the tetraquark states.

scholarly journals Scalar fully-heavy tetraquark states $$QQ^\prime {\bar{Q}} \bar{Q^\prime }$$ in QCD sum rules

2021 ◽  
Vol 81 (4) ◽  
Author(s):  
Bo-Cheng Yang ◽  
Liang Tang ◽  
Cong-Feng Qiao
Keyword(s):  
Sum Rules ◽  
Lhcb Collaboration ◽  
Tetraquark State ◽  
Qcd Sum Rules ◽  
Quark Sector ◽  
The Masses ◽  
B Quark ◽  
Broad Structure ◽  
Narrow Structure ◽  
Formula Type

AbstractVery recently, the LHCb Collaboration observed distinct structures with the $$cc{\bar{c}}{\bar{c}}$$ c c c ¯ c ¯ in the $$J/\Psi $$ J / Ψ -pair mass spectrum. In this work, we construct four scalar ($$J^{PC} = 0^{++}$$ J PC = 0 + + ) $$[8_c]_{Q\bar{Q^\prime }}\otimes [8_c]_{Q^\prime {\bar{Q}}}$$ [ 8 c ] Q Q ′ ¯ ⊗ [ 8 c ] Q ′ Q ¯ type currents to investigate the fully-heavy tetraquark state $$Q Q^\prime {\bar{Q}} \bar{Q^\prime }$$ Q Q ′ Q ¯ Q ′ ¯ in the framework of QCD sum rules, where $$Q=c, b$$ Q = c , b and $$Q^\prime = c, b$$ Q ′ = c , b . Our results suggest that the broad structure around 6.2-6.8 GeV can be interpreted as the $$0^{++}$$ 0 + + octet–octet tetraquark states with masses $$6.44\pm 0.11$$ 6.44 ± 0.11 GeV and $$6.52\pm 0.10$$ 6.52 ± 0.10 GeV, and the narrow structure around 6.9 GeV can be interpreted as the $$0^{++}$$ 0 + + octet–octet tetraquark states with masses $$6.87\pm 0.11$$ 6.87 ± 0.11 GeV and $$6.96\pm 0.11$$ 6.96 ± 0.11 GeV, respectively. Extending to the b-quark sector,the masses of their fully-bottom partners are found to be around 18.38-18.59 GeV. Additionally, we also analyze the spectra of the $$[8_c]_{c{\bar{c}}}\otimes [8_c]_{b {\bar{b}}}$$ [ 8 c ] c c ¯ ⊗ [ 8 c ] b b ¯ and $$[8_c]_{c{\bar{b}}}\otimes [8_c]_{b {\bar{c}}}$$ [ 8 c ] c b ¯ ⊗ [ 8 c ] b c ¯ tetraquark states, which lie in the range of 12.51–12.74 GeV and 12.49–12.81 GeV, respectively.

scholarly journals The masses of the $0^{++}$ and $0^{-+}$ light-quark hybrids using QCD sum rules

1999 ◽  
Vol 8 (3) ◽  
pp. 465-471 ◽  
Author(s):  
Tao Huang ◽  
Hongying Jin ◽  
Ailin Zhang
Keyword(s):  
Sum Rules ◽  
Light Quark ◽  
Qcd Sum Rules ◽  
The Masses

scholarly journals Light Tetraquark State Candidates

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Zhi-Gang Wang
Keyword(s):  
Excellent Agreement ◽  
Sum Rules ◽  
Tetraquark State ◽  
Qcd Sum Rules ◽  
The Masses

In this article, we study the axialvector-diquark-axialvector-antidiquark type scalar, axialvector, tensor, and vector sss¯s¯ tetraquark states with the QCD sum rules. The predicted mass mX=2.08±0.12 GeV for the axialvector tetraquark state is in excellent agreement with the experimental value 2062.8±13.1±4.2 MeV from the BESIII collaboration and supports assigning the new X state to be a sss¯s¯ tetraquark state with JPC=1+−. The predicted mass mX=3.08±0.11 GeV disfavors assigning ϕ2170 or Y2175 to be the vector partner of the new X state. As a byproduct, we obtain the masses of the corresponding qqq¯q¯ tetraquark states. The light tetraquark states lie in the region about 2 GeV rather than 1 GeV.

scholarly journals SCALING RELATIONS IN THE PHENOMENOLOGY OF QCD SUM RULES FOR THE HEAVY QUARKONIUM

1996 ◽  
Vol 11 (20) ◽  
pp. 3689-3709 ◽  
Author(s):  
V.V. KISELEV
Keyword(s):  
Heavy Quark ◽  
Sum Rules ◽  
Scaling Relations ◽  
Heavy Quarkonium ◽  
S Wave ◽  
Qcd Sum Rules ◽  
Specific Scheme ◽  
The Difference ◽  
The Masses

In the framework of a specific scheme of the QCD sum rules for S wave levels of the heavy quarkonium, we derive expressions relating the leptonic constants, the energetic density of quarkonium states and universal characteristics in the heavy quarkonium physics, such as the difference between the masses of heavy quark Q and meson [Formula: see text] and the number of heavy quarkonium levels below the threshold of [Formula: see text] decay.

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