scholarly journals Calculation of doubly heavy baryons decay

2021 ◽  
Vol 78 (3) ◽  
pp. 4-11
Author(s):  
Zh.Zh. Tyulemissov ◽  
◽  
A.N. Issadykov ◽  
A.K. Bekbaev ◽  
D.T. Aznabaev ◽  
...  
Keyword(s):  
Experimental Data ◽  
Form Factors ◽  
Heavy Baryon ◽  
Nonleptonic Decay ◽  
Heavy Baryons ◽  
Charm Baryon ◽  
Helicity Amplitudes ◽  
Pros And Cons ◽  
Double Charm ◽  
Good Agreement

We calculated a subclass of four nonleptonic two-body weak decays of the double charm baryon ground states Ξcc++. Nonleptonic decays can be dividedinto two group: factorizable and nonfactorizable decays. The first one can be easily calculated from first principles. Therefore, its good example understands all pros and cons of a model. We focused on a weak two-body nonleptonic decay consists only fromthe factorizing contribution precluding a contamination from W-exchange. We use the covariant confined quark model previously developed by us to calculate the various helicity amplitudes which describe the dynamics of the transition induced by the Cabibbo-favored effective currents. Achievement of CCQM is that only size parameter Λvarying can describe all tree diagrams of nonleptonic decay. We then proceed to calculate the rates of the decay. The rates, branching ratios and helicity amplitude were calculated using dimensionless invariant form factors. Also, we calculated leptonic constant for scalar and vector mesons which has good agreement with experimental data. There isn’t any experimental data about the decay so we waiting for new experimental observation in the heavy baryon sector.

scholarly journals Heavy Baryon Spectroscopy in the Relativistic Quark Model

Particles ◽  
2020 ◽  
Vol 3 (1) ◽  
pp. 234-244 ◽  
Author(s):  
Rudolf N. Faustov ◽  
Vladimir O. Galkin
Keyword(s):  
Experimental Data ◽  
Quark Model ◽  
Heavy Baryon ◽  
Lhcb Collaboration ◽  
Relativistic Quark Model ◽  
Quantum Numbers ◽  
Heavy Baryons ◽  
Baryon Spectroscopy ◽  
Good Agreement

Masses of heavy baryons are calculated in the framework of the relativistic quark-diquark picture and QCD. The obtained results are in good agreement with available experimental data including recent measurements by the LHCb Collaboration. Possible quantum numbers of excited heavy baryon states are discussed.

scholarly journals Heavy baryon spectroscopy

2019 ◽  
Vol 204 ◽  
pp. 08001 ◽  
Author(s):  
Rudolf N. Faustov ◽  
Vladimir O. Galkin
Keyword(s):  
Experimental Data ◽  
Heavy Baryon ◽  
Lhcb Collaboration ◽  
Quantum Numbers ◽  
Heavy Baryons ◽  
Baryon Spectroscopy ◽  
Good Agreement

Masses of heavy baryons are calculated in the relativistic quarkdiquark picture. Obtained results are in good agreement with available experimental data including recent measurements by the LHCb Collaboration. Possible quantum numbers of excited heavy baryon states are discussed.

Inelastic electric and magnetic electron scattering form factors of 24Mg nucleus: Role of g factors

2017 ◽  
Vol 26 (05) ◽  
pp. 1750032 ◽  
Author(s):  
Anwer A. Al-Sammarraie ◽  
M. L. Inche Ibrahim ◽  
Muna Ahmed Saeed ◽  
Fadhil I. Sharrad ◽  
Hasan Abu Kassim
Keyword(s):  
Experimental Data ◽  
Electron Scattering ◽  
Form Factors ◽  
Wave Functions ◽  
Matrix Elements ◽  
Model Hamiltonian ◽  
Transverse Electron ◽  
Magnetic Electron ◽  
Good Agreement

The electric and magnetic transitions in the [Formula: see text]Mg nucleus are studied based on the calculations of the longitudinal and the transverse electron scattering form factors. The universal sd-shell model Hamiltonian (USDA) is used for calculations. The wave functions of radial single-particle matrix elements are calculated using the Skyrme potential. For the longitudinal form factors, a good agreement is obtained between the calculations and the experimental data. For the transverse form factors, the effective [Formula: see text] factors are made as adjustable parameters in order to describe the experimental data.

Decay rates and masses for some heavy baryons in the hyper-central quark model

2020 ◽  
Vol 35 (10) ◽  
pp. 2050056
Author(s):  
M. Abu-Shady ◽  
M. M. A. Ahmed ◽  
N. H. Gerish
Keyword(s):  
Experimental Data ◽  
Wave Function ◽  
Decay Width ◽  
Iteration Method ◽  
Decay Rates ◽  
Cornell Potential ◽  
Heavy Baryons ◽  
Radial Schrödinger Equation ◽  
Rate Of Decay ◽  
Good Agreement

Masses and decay width for some heavy baryons are studied within Isgur–Wise formalism. The extended Cornell potential is employed. The hyper-radial Schrödinger equation with extended Cornell potential is solved to obtain eigenvalues of energy and baryonic wave function by using the extended iteration method. Masses and the rate of decay width for some heavy baryons are calculated. The present results are improved in comparison with other recent works and are in a good agreement with experimental data.

scholarly journals Theory determination of $$\varvec{\bar{B}\rightarrow D^{(*)}\ell ^-\bar{\nu }}$$ form factors at $$\varvec{\mathcal {O}(1/m_c^2)}$$

2020 ◽  
Vol 80 (2) ◽  
Author(s):  
Marzia Bordone ◽  
Martin Jung ◽  
Danny van Dyk
Keyword(s):  
Experimental Data ◽  
Light Cone ◽  
Sum Rules ◽  
Form Factors ◽  
Longitudinal Polarization ◽  
Polarization Fraction ◽  
Theoretical Results ◽  
Good Agreement ◽  
Lepton Flavour

Abstract We carry out an analysis of the full set of ten $$\bar{B}\rightarrow D^{(*)}$$B¯→D(∗) form factors within the framework of the Heavy-Quark Expansion (HQE) to order $$\mathcal {O}\left( \alpha _s,\,1/m_b,\,1/m_c^2\right) $$Oαs,1/mb,1/mc2, both with and without the use of experimental data. This becomes possible due to a recent calculation of these form factors at and beyond the maximal physical recoil using QCD light-cone sum rules, in combination with constraints from lattice QCD, QCD three-point sum rules and unitarity. We find good agreement amongst the various theoretical results, as well as between the theoretical results and the kinematical distributions in $$\bar{B}\rightarrow D^{(*)}\lbrace e^-,\mu ^-\rbrace \bar{\nu }$$B¯→D(∗){e-,μ-}ν¯ measurements. The coefficients entering at the $$1/m_c^2$$1/mc2 level are found to be of $$\mathcal {O}(1)$$O(1), indicating convergence of the HQE. The phenomenological implications of our study include an updated exclusive determination of $$|V_{cb}|$$|Vcb| in the HQE, which is compatible with both the exclusive determination using the BGL parametrization and with the inclusive determination. We also revisit predictions for the lepton-flavour universality ratios $$R_{D^{(*)}}$$RD(∗), the $$\tau $$τ polarization observables $$P_\tau ^{D^{(*)}}$$PτD(∗), and the longitudinal polarization fraction $$F_L$$FL. Posterior samples for the HQE parameters are provided as ancillary files, allowing for their use in subsequent studies.

scholarly journals Novel Ideas in Nonleptonic Decays of Double Heavy Baryons

Particles ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 339-356 ◽  
Author(s):  
Thomas Gutsche ◽  
Mikhail Ivanov ◽  
Jürgen Körner ◽  
Valery Lyubovitskij
Keyword(s):  
W Boson ◽  
New Physics ◽  
Lhcb Collaboration ◽  
Tree Level ◽  
Matrix Elements ◽  
Compositeness Condition ◽  
Heavy Baryons ◽  
Charm Baryon ◽  
Nonleptonic Decays ◽  
Double Charm

The recent discovery of double charm baryon states by the LHCb Collaborarion and their high precision mass determination calls for a comprehensive analysis of the nonleptonic decays of double and single heavy baryons. Nonleptonic baryon decays play an important role in particle phenomenology since they allow for studying the interplay of long and short distance dynamics of the Standard Model (SM). Furthermore, they allow one to search for New Physics effects beyond the SM. We review recent progress in experimental and theoretical studies of the nonleptonic decays of heavy baryons with a focus on double charm baryon states and their decays. In particular, we discuss new ideas proposed by the present authors to calculate the W-exchange matrix elements of the nonleptonic decays of double heavy baryons. An important ingredient in our approach is the compositeness condition of Salam and Weinberg, and an effective implementation of infrared confinement both of which allow one to describe the nonperturbative structure of baryons composed of light and heavy quarks. Furthermore, we discuss an ab initio calculational method for the treatment of the so-called W-exchange diagrams generated by W ± boson exchange between quarks. We found that the W ± -exchange contributions are not suppressed in comparison with the tree-level (factorizing) diagrams and must be taken into account in the evaluation of matrix elements. Moreover, there are decay processes such as the doubly Cabibbo-suppressed decay Ξ c + → p ϕ recently observed by the LHCb Collaboration, which is contributed to only by one single W-exchange diagram.

DYNAMICAL STUDY OF HEAVY-BARYON SPECTROSCOPY

2008 ◽  
Vol 23 (22) ◽  
pp. 1819-1828 ◽  
Author(s):  
YOUCHANG YANG ◽  
CHENGRONG DENG ◽  
HONGXIA HUANG ◽  
JIALUN PING
Keyword(s):  
Experimental Data ◽  
Constituent Quark ◽  
Heavy Baryon ◽  
Expansion Method ◽  
Constituent Quark Model ◽  
S Wave ◽  
Dynamical Study ◽  
Heavy Baryons ◽  
Baryon Spectra ◽  
Baryon Spectroscopy

The spectroscopy of S-wave heavy-baryons containing one, two or three heavy quarks is investigated in a constituent quark model. We solve the Schrödinger equation for three particles exactly by means of a Gaussian expansion method. The calculated results of heavy-baryon spectra with a single heavy quark are consistent with the experimental data.

scholarly journals Study of baryon octet charge form factors in perturbative chiral quark model

2014 ◽  
Vol 29 ◽  
pp. 1460252
Author(s):  
X. Y. Liu ◽  
K. Khosonthongkee ◽  
A. Limphirat ◽  
Y. Yan
Keyword(s):  
Experimental Data ◽  
Wave Function ◽  
Quark Model ◽  
Form Factors ◽  
Baryon Octet ◽  
Chiral Quark Model ◽  
Charge Form ◽  
Quark Wave Function ◽  
Theoretical Results ◽  
Good Agreement

The charge form factors of baryon octet are studied in the perturbative chiral quark model (PCQM). The relativistic quark wave function is extracted by fitting the theoretical results of the nucleon charge form factors to the experimental data and the predetermined quark wave function is applied to study the charge form factors of other octet baryons. The PCQM results are found, based on the predetermined quark wave function, in good agreement with the experimental data.

scholarly journals DISPERSIVE BOUNDS ON THE SHAPE OF $\Lambda_b\to \Lambda_b l\bar{\nu}_l$ FORM FACTORS

1999 ◽  
Vol 14 (15) ◽  
pp. 2385-2395 ◽  
Author(s):  
DEBRUPA CHAKRAVERTY ◽  
TRIPTESH DE ◽  
BINAYAK DUTTA-ROY ◽  
K. S. GUPTA
Keyword(s):  
Experimental Data ◽  
Heavy Quark ◽  
Charge Radius ◽  
Form Factors ◽  
Heavy Baryon ◽  
Dispersion Relations ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
Input Information ◽  
Crossing Symmetry

We derive a theoretically allowed domain for the charge radius ρ and the curvature c of the Isgur–Wise function describing the decay [Formula: see text]. Our method uses crossing symmetry, dispersion relations and analyticity in the context of the heavy quark effective theory (HQET), but is independent of the specifics of any given model. The experimentally determined values of the ϒ masses have been used as input information. The results are of interest for testing different models employed to calculate the heavy baryon form factors which are used for the extraction of |Vcb| from experimental data.

On the electromagnetic form factors of the nucleon

1995 ◽  
Vol 73 (3-4) ◽  
pp. 236-240 ◽  
Author(s):  
A. Bhattacharya ◽  
T. L. Remadevi ◽  
S. N. Banerjee
Keyword(s):  
Experimental Data ◽  
Wave Function ◽  
Statistical Model ◽  
Form Factors ◽  
Electromagnetic Form Factors ◽  
New Wave ◽  
Good Agreement

In the context of the modified version of the statistical model, a new wave function for a baryon is suggested. Properties such as formfactors, polarizabilities, etc. of the proton were studied using the aforesaid wave function and the properties of neutron were also probed through the properties of the proton. The estimated results are in good agreement with existing experimental data.

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