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Article
Physics, Nuclear
Chao-Qiang Geng et al.
Article
Astronomy & Astrophysics
Chao-Qiang Geng et al.
Summary: We studied the ratio R = 2 Gamma(Xi(0)(c) -> Xi- e(+)nu(e))/3 Gamma(Lambda(+)(c) -> Lambda e(+) nu(e)) and found it to be R = 1(0.8) based on exact(broken) SU(3) flavor symmetry, in contrast to the average value of R-av= 0.59 +/- 0.10 from the ALICE collaboration and lattice QCD results. To resolve this discrepancy, we proposed the use of Xi(c) - Xi(c)' mixing, which results in R approximately equal to 0.6. We also suggested experiments to measure the decays of Xi(c) -> Xi'(1530)e(+)nu(e) and discussed other evidences of mixing.
Article
Astronomy & Astrophysics
Zhi-Peng Xing et al.
Summary: In this work, a novel method is proposed to search for the E0 thorn c - E0 thorn 0 c mixing effect in the angular distribution analysis of the Ec -> Eo0 thorn oA pi thorn l thorn nu decay. The appearance of the E0 resonance indicates the presence of the mixing effect, which can be observed using this angular distribution. The forward-backward asymmetry, as a function of the invariant mass square of Eo0 thorn and the E0 thorn c - E0 thorn 0 c mixing angle theta c, can be utilized to distinguish the two resonances and determine the exact mixing angle.
Article
Astronomy & Astrophysics
Zhen-Xing Zhao et al.
Summary: In this work, a three-quark picture is constructed using a bottom-up approach for baryons in a light-front quark model. The shape parameters, which characterize the momentum distribution inside a baryon, are determined with the help of the pole residue of the baryon. The relation between the three-quark picture and the diquark picture is clarified. When building the model, it is found that Lorentz boost plays a crucial role, and the bottom-up modeling approach can be generalized to multiquark states. Based on this, a unified theoretical framework for describing multiquark states may be established.
Article
Physics, Nuclear
Qi-An Zhang et al.
Summary: In this study, the properties of Xi(c) baryons are investigated using state-of-the-art lattice QCD techniques, and the obtained results are consistent with experimental evidence and more precise than previous measurements.
Review
Physics, Multidisciplinary
R. L. Workman et al.
Summary: The Review provides a comprehensive summary of particle physics and cosmology, including measurements, searches for hypothetical particles, and summaries of properties and search limits. It consists of two volumes, with Summary Tables, review articles, and Particle Listings.
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
(2022)
Article
Astronomy & Astrophysics
Hong-Wei Ke et al.
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
Astronomy & Astrophysics
Xiao-Gang He et al.
Summary: Using flavor SU(3) symmetry, we analyzed the semileptonic decays of anti-triplet charmed baryons and found significant discrepancies between experimental data and theoretical predictions, indicating severe breaking of the SU(3) symmetry. We then considered generic SU(3) breaking effects, finding that the breaking effects are large but can be explained in different scenarios. Furthermore, we explored testable implications in some interesting scenarios that can be rigorously tested with more data.
Article
Physics, Nuclear
Yoshimitsu Matsui
Summary: The Heavy Quark Effective Theory provides a systematic method for estimating mixing angles of hadron states in heavy quarks, specifically charm quark (c) and bottom quark (b). By utilizing this method, accurate calculations of mixing angles for baryons like Xi Q- Xi Q can be obtained.
Article
Physics, Multidisciplinary
Y. B. Li et al.
Summary: Using data samples recorded at energies of 10.52 and 10.58 GeV, measurements of branching fractions of semileptonic decays and the CP-asymmetry parameter of specific decays were reported with improved precision. The results are consistent with lepton flavor universality, and the asymmetry parameter is found to be consistent with zero.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Particles & Fields
Zhen-Xing Zhao et al.
EUROPEAN PHYSICAL JOURNAL C
(2020)
Article
Astronomy & Astrophysics
T. M. Aliev et al.
