Article
Astronomy & Astrophysics
Pedro Bicudo, Nuno Cardoso, Lasse Mueller, Marc Wagner
Summary: In this paper, the study of I=0 bottomonium in various waves and channels is presented, using a novel approach involving lattice QCD string breaking potentials. The results are compared to experimental data and the angular momentum quantum numbers are assigned. The composition of these states is also determined to distinguish between ordinary quarkonium and tetraquarks.
Article
Astronomy & Astrophysics
A. F. Krutov, V. E. Troitsky
Summary: In this study, we use a version of instant-form relativistic quantum mechanics to calculate the gravitational form factors of the pion, taking into account the gravitational structure of constituent quarks. The results show that the form factors are almost insensitive to the type of quark wave function model, similar to the case of the pion electromagnetic form factor.
Article
Physics, Particles & Fields
Xiang Wei, Qing-Hua Shen, Ju-Jun Xie
Summary: This theoretical study investigates the D (D) over barK three body system using the fixed center approximation and the chiral unitary approach. The study finds a resonance structure in the three body K-(D (D) over bar)(X(3720)) scattering amplitude, supporting the formation of a D (D) over barK bound state.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Multidisciplinary
Meng-Lin Du, Feng-Kun Guo, Christoph Hanhart, Bastian Kubis, Ulf-G Meissner
Summary: The study reveals that the parameters assigned to the lightest scalar D meson are in conflict with experimental data, while a much lighter charmed scalar meson, the D-0*(2100), can well describe the data. In addition, it is found that an intermediate rho(-) exchange is related to the difference between the low-energy S-wave D pi phase and the D pi scattering phase shift in the analyzed data.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Cheuk-Yin Wong
Summary: If we approximate light quarks as massless and apply the Schwinger confinement mechanism, we will find that a light quark and its antiquark will be confined as a boson in the Abelian U(1) QED gauge interaction in (1+1)D, as in an open string. This confinement mechanism may also apply to massive quarks in (1+1)D. The observations of anomalous soft photons, the X17 particle, and the E38 particle suggest that they may provide experimental evidence for the existence of QED mesons.
FRONTIERS OF PHYSICS
(2023)
Article
Astronomy & Astrophysics
Yu-Shuai Li, Xiang Liu
Summary: In this work, the branching ratios of the color-allowed two-body nonleptonic decays of the bottom baryons are calculated using the three-body light-front quark model. The spatial wave functions of the heavy baryons involved in these weak decays are obtained using a semirelativistic potential model and the Gaussian expansion method. The results show that these decays have considerable widths and could be observed in the ongoing LHCb and Belle II experiments.
Article
Astronomy & Astrophysics
Hong-Wei Ke, Xue-Qian Li
Summary: The LHCb collaboration has measured the decay rate of the doubly charmed baryon Xi cc(++) and reported a ratio of its branching fraction to another decay. This result contradicts theoretical predictions. The researchers used the light-front quark model to study the decay process and proposed a mixing mechanism to explain the discrepancy between the experimental result and theoretical predictions.
Article
Physics, Multidisciplinary
C. W. Xiao, S. Rahmani, H. Hassanabadi
Summary: This study investigates the decay properties of beauty and charm mesons using a phenomenological potential model, calculating various parameters such as masses, decay constants, and branching ratios. The results are in line with other theoretical models and experimental data.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Astronomy & Astrophysics
Si-Qiang Luo, Bing Chen, Xiang Liu, Takayuki Matsuki
Summary: Using an unquenched quark model, a charmed-strange baryon state Omega(d)(c0)(1P, 1/2(-)) is predicted with a mass below a specific threshold, analogous to the D*(s0)(2317) meson. It is suggested that the Belle II experiment could explore this prediction in the future Omega(()(c)*())gamma mass spectrum experiment.
Article
Astronomy & Astrophysics
Chun-Khiang Chua
Summary: This study investigates the decays between baryons using a topological amplitude approach. The research finds threshold enhancement in certain modes, leading to significant SU(3) breaking effects in decay rates. Model calculations predict branching ratios for different modes and identify modes with relatively high detectability and rates.
Article
Astronomy & Astrophysics
M. C. Gordillo, J. M. Alcaraz-Pelegrina
Summary: Using a diffusion Monte Carlo technique, this study calculated the properties of fully heavy arrangements, including a range of 5 to 12 quarks. The analysis found that the mass per particle levels off for arrangements with the number of quarks larger than or equal to six, implying that fully heavy multiquarks are compact structures.
Article
Physics, Particles & Fields
H. Dutrieux, O. Grocholski, H. Moutarde, P. Sznajder
Summary: This study discusses the use of machine learning techniques in nonparametric modelling of generalised parton distributions (GPDs) and presents a new strategy to reduce model dependency. The work helps in controlling systematic effects and improving the precision in GPD phenomenology.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Zheng Zhao, Kai Xu, Attaphon Kaewsnod, Xuyang Liu, Ayut Limphirat, Yupeng Yan
Summary: This study calculates the masses of qq(Q) over bar(Q) over bar tetraquark states using a constituent quark model and compares the theoretical predictions with experimental results, suggesting possible assignments.
Article
Astronomy & Astrophysics
Niu Su, Hua-Xing Chen, Wei Chen, Shi-Lin Zhu
Summary: We investigate the double-gluon hybrid states composed of quark-gluon contents q over bar qgg (q = u/d) and s over bar sgg. Twelve double-gluon hybrid currents with various quantum numbers are constructed, and five of them are found to be zero due to some internal symmetries. The remaining seven currents are used for QCD sum rule analyses. In particular, the masses of the double-gluon hybrid states with exotic quantum number JPC = 2+- are calculated to be Mlq over bar qgg;2+-) = 2.26+0.20 -0.25 GeV and Mls over bar sgg;2+-) = 2.38+0.19 -0.25 GeV. Their two-and three-meson decay patterns are also studied.
Article
Astronomy & Astrophysics
Zhuo Gao, Guan-Ying Wang, Qi-Fang Lu, Jingya Zhu, Gao-Feng Zhao
Summary: In this study, the D-s0 (2590)(+) resonance is described by considering the screening effects in the potential model, and the mass spectrum and strong decays of the excited charmed-strange mesons are investigated within the modified relativized quark model and P-3(0) model. The calculated mass and width of the D-s0 (2590)(+) are consistent with the experimental observations, indicating that it can be reasonably interpreted as the D-s(2(1)S(0)) state.
