scholarly journals Masses of fully heavy tetraquarks $$QQ {\bar{Q}} {\bar{Q}}$$ in an extended relativized quark model

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Qi-Fang Lü ◽  
Dian-Yong Chen ◽  
Yu-Bing Dong
Keyword(s):  
Quark Model ◽  
Mass Spectra ◽  
Ground States ◽  
Lhcb Collaboration ◽  
Wave Functions ◽  
Recent Measurement ◽  
Heavy Quarkonium ◽  
Radial Excitation ◽  
Broad Structure ◽  
Narrow Structure

AbstractInspired by recent measurement of possible fully charmed tetraquarks in LHCb Collaboration, we investigate the mass spectra of fully heavy tetraquarks $$QQ {\bar{Q}} {\bar{Q}}$$ Q Q Q ¯ Q ¯ in an extended relativized quark model. Our estimations indicate that the broad structure around 6.4 GeV should contain one or more ground states for $$cc {\bar{c}} {\bar{c}}$$ c c c ¯ c ¯ tetraquarks, while the narrow structure near 6.9 GeV can be categorized as the first radial excitation of $$cc {\bar{c}} {\bar{c}}$$ c c c ¯ c ¯ system. Moreover, with the wave functions of the tetraquarks and mesons, the strong decays of tetraquarks into heavy quarkonium pair are qualitatively discussed, which can be further checked by the LHCb and CMS Collaborations.

scholarly journals Lepton polarization asymmetries for FCNC decays of the Λb baryon

2015 ◽  
Vol 30 (27) ◽  
pp. 1550172 ◽  
Author(s):  
L. Mott ◽  
W. Roberts
Keyword(s):  
Quark Model ◽  
Ground State ◽  
Neutral Current ◽  
Form Factors ◽  
Branching Ratios ◽  
Constituent Quark Model ◽  
Lhcb Collaboration ◽  
Recent Measurement ◽  
Lepton Polarization ◽  
State Formula

Branching ratios, lepton forward–backward asymmetries, and lepton polarization asymmetries for the flavor-changing neutral current (FCNC) dileptonic decays of the [Formula: see text] baryon to the ground state and a number of excited state [Formula: see text] baryons are calculated using form factors extracted using wave functions from a constituent quark model. The SM branching ratios for the transition to the ground state calculated using these quark model form factors are consistent with the recent measurement reported by the LHCb collaboration. It is shown that the lepton polarization asymmetries are largely insensitive to the transition form factors and, therefore, may also be insensitive to the effects of QCD in the nonperturbative regime. These observables could therefore provide somewhat model independent ways of extracting various combinations of the Wilson coefficients.

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 Mass Spectra and Wave Functions of Meson Systems and the Covariant Oscillator Quark Model as an Expansion Basis

1999 ◽  
Vol 102 (2) ◽  
pp. 297-312 ◽  
Author(s):  
Ryuichi Oda ◽  
Kenji Yamada ◽  
Shin Ishida ◽  
Motoo Sekiguchi ◽  
Hiroaki Wada
Keyword(s):  
Quark Model ◽  
Mass Spectra ◽  
Wave Functions

scholarly journals Heavy quarkonium mass spectra in a relativistic quark model

2005 ◽  
Vol 54 (3) ◽  
pp. 1136
Author(s):  
Chen Hong ◽  
Mei Hua ◽  
Shen Peng-Nian ◽  
Jiang Huan-Qing
Keyword(s):  
Quark Model ◽  
Mass Spectra ◽  
Heavy Quarkonium ◽  
Relativistic Quark Model

scholarly journals Canonical interpretation of the X(4140) state within the $$^3P_0$$ model

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
Wei Hao ◽  
Guan-Ying Wang ◽  
En Wang ◽  
Guan-Nan Li ◽  
De-Min Li
Keyword(s):  
Quark Model ◽  
High Precision ◽  
Precision Measurement ◽  
Mass Spectra ◽  
Lhcb Collaboration ◽  
Experimental Measurements ◽  
Strong Decay ◽  
High Precision Measurement ◽  
Decay Properties ◽  
Small Width

Abstract Recently, the LHCb Collaboration has confirmed the state X(4140), with a mass $$M=4146.5\pm 4.5^{+4.6}_{-2.8}$$M=4146.5±4.5-2.8+4.6 MeV, and a much larger width $$\Gamma =83\pm 21^{+21}_{-14}$$Γ=83±21-14+21 MeV than the previous experimental measurements, which has confused the understanding of its nature. We will investigate the possibility of the $$\chi _{c1}(3P)$$χc1(3P) interpretation for the X(4140), considering the mass spectra predicted in the quark model, and the strong decay properties within the $$^3P_0$$3P0 model. We also predict the strong decay properties of the charmonium states $$\chi _{c0}(3P)$$χc0(3P) and $$\chi _{c2}(3P)$$χc2(3P). Our results show that the X(4140) state with the small width given in PDG can be explained as the charmonium state $$\chi _{c1}(3P)$$χc1(3P) in the $$^3P_0$$3P0 model, and high precision measurement of the width of the X(4140) is crucial to understand its nature.

scholarly journals Symmetries in subatomic multi-quark systems

2018 ◽  
Vol 27 (12) ◽  
pp. 1840003
Author(s):  
J. D. Vergados ◽  
D. Strottman
Keyword(s):  
Quantum Chromodynamics ◽  
Quark Model ◽  
Spin Symmetry ◽  
Wave Functions ◽  
Low Energy ◽  
Isospin Symmetry ◽  
Permutation Symmetry

We discus the role of Quantum Chromodynamics (QCD) in low energy phenomena involving the color-spin symmetry of the quark model. We then combine it with orbital and isospin symmetry to obtain wave functions with the proper permutation symmetry, focusing on multi-quark systems.

scholarly journals Studies of the resonance components in the $$B_s$$ decays into charmonia plus kaon pair

2019 ◽  
Vol 79 (9) ◽  
Author(s):  
Zhou Rui ◽  
Ya Li ◽  
Hong Li
Keyword(s):  
Mass Spectra ◽  
Branching Ratios ◽  
Mass Region ◽  
Lhcb Collaboration ◽  
High Mass ◽  
Mass Window ◽  
Resonant Structures ◽  
Three Body ◽  
Near Future ◽  
Existing Data

Abstract In this work, the decays of $$B_s$$Bs meson to a charmonium state and a $$K^+K^-$$K+K- pair are carefully investigated in the perturbative QCD approach. Following the latest fit from the LHCb experiment, we restrict ourselves to the case where the produced $$K^+K^-$$K+K- pair interact in isospin zero S, P, and D wave resonances in the kinematically allowed mass window. Besides the dominant contributions of the $$\phi (1020)$$ϕ(1020) resonance in the P-wave and $$f_2'(1525)$$f2′(1525) in the D-wave, other resonant structures in the high mass region as well as the S-wave components are also included. The invariant mass spectra for most of the resonances in the $$B_s\rightarrow J/\psi K^+K^-$$Bs→J/ψK+K- decay are well reproduced. The obtained three-body decay branching ratios can reach the order of $$10^{-4}$$10-4, which seem to be accessible in the near future experiments. The associated polarization fractions of those vector-vector and vector-tensor modes are also predicted, which are compared with the existing data from the LHCb Collaboration.

STUDY OF QUARK-HADRON DUALITY BASED ON A CONSTITUENT QUARK MODEL

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1914-1917
Author(s):  
Y. B. DONG
Keyword(s):  
Inelastic Scattering ◽  
Structure Function ◽  
Quark Model ◽  
Constituent Quark ◽  
Resonance Region ◽  
Constituent Quark Model ◽  
Recent Measurement ◽  
Nucleon Structure ◽  
Nucleon Structure Function ◽  
Hadron Duality

The recent measurement of quark-hadron duality is shortly discussed by using a simple constituent quark model. Comparing with the moments of the structure functions in the resonance region and in the deep inelastic scattering region, we study the occurances of Bloom-Gilman quark-hadron duality for the nucleon structure function F2 and g1. Local duality is also analyzed.

scholarly journals Mass spectra and radiative transitions of doubly heavy baryons in a relativized quark model

2017 ◽  
Vol 96 (11) ◽  
Author(s):  
Qi-Fang Lü ◽  
Kai-Lei Wang ◽  
Li-Ye Xiao ◽  
Xian-Hui Zhong
Keyword(s):  
Quark Model ◽  
Mass Spectra ◽  
Radiative Transitions ◽  
Heavy Baryons

scholarly journals Hadronic Paschen-Back effect in P-wave charmonia under strong magnetic fields

2019 ◽  
Vol 49 ◽  
pp. 1960002
Author(s):  
Sachio Iwasaki ◽  
Makoto Oka ◽  
Kei Suzuki ◽  
Tetsuya Yoshida
Keyword(s):  
Magnetic Fields ◽  
Mass Spectra ◽  
Constituent Quark ◽  
Expansion Method ◽  
Wave Functions ◽  
P Wave ◽  
Strong Magnetic Fields ◽  
Mixing Ratios ◽  
Angular Momenta ◽  
Quark Models

The Hadronic Paschen-Back effect (HPBE) is a new phenomenon induced by the interplay between finite orbital angular momenta of hadrons and external strong magnetic fields. We review the HPBE in P-wave charmonia and show its mass spectra, deformed wave functions, and mixing ratios, which are evaluated by the constituent quark models in a magnetic field and the cylindrical Gaussian expansion method.

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