Triply Heavy Baryons Research Articles

A novel approach for spectroscopic study of Ωbbc baryon in the hypercentral constituent Quark model

In this paper, we determine the radial and orbital states mass spectra of the triply heavy baryon [Formula: see text] with total spin [Formula: see text] and 3/2 using the hypercentral constituent quark model (hCOM). The mass spectra are obtained by incorporating the color Coulomb plus linear confining term and the harmonic oscillator potential with first-order correction. Additionally, we considered spin–spin, spin-orbit and tensor interactions for hyperfine splitting calculation. Our computed mass spectra of the [Formula: see text] baryon is compared with existing literature. Further, we establish Regge trajectories of this baryon in ([Formula: see text]) and ([Formula: see text]) planes which are helpful in determining the unknown quantum number and [Formula: see text] values.

Weak decays of the triply heavy baryons in the three-quark picture with the light-front quark model

We investigate the weak decays of the triply heavy baryon ΩQQQ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\Omega _{QQQ}$$\\end{document} in the light-front quark model. Since ΩQQQ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\Omega _{QQQ}$$\\end{document} consists of three indistinguishable identical heavy quarks, the commonly adopted quark–diquark picture does not seem to be valid anymore. Instead, we employ the three-quark picture for baryons where the three quarks are regarded as individual quarks. We calculate the hadronic form factors for the transitions and give predictions for the decay widths of the semi-leptonic decay modes Ωccc→Ξcc/Ωcc+l+νl\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\Omega _{ccc}\\rightarrow \\Xi _{cc}/ \\Omega _{cc}+ l^+\ u _l$$\\end{document}, Ωbbb→Ξbb+l-ν¯l\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\Omega _{bbb}\\rightarrow \\Xi _{bb}+ l^-\\bar{\ u }_l$$\\end{document} and the non-leptonic decay modes Ωccc→Ξcc/Ωcc+M\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\Omega _{ccc}\\rightarrow \\Xi _{cc}/\\Omega _{cc}+ M$$\\end{document}, Ωbbb→Ξbb+M\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\Omega _{bbb}\\rightarrow \\Xi _{bb}+ M$$\\end{document}. Our study can be a guide for future experiments to discover the triply heavy baryons.

String-breaking of the triply heavy baryon at finite temperature and chemical potential

String-breaking of the triply heavy baryon at finite temperature and chemical potential

Mass predictions of triply heavy hybrid baryons via QCD sum rules

In this article, we study the mass spectrum of the low-lying triply heavy hybrid baryon, which consists of three valence heavy quarks in a color octet and one valence gluon, with spin-parity J^P=(frac{1}{2})^+ via QCD sum rules. This is the first study on the triply heavy hybrid baryons in the framework of QCD sum rules. After performing the QCD sum rule analysis, we find that the mass of cccg hybrid baryon lies in M_{cccg}= 5.91–6.13 GeV. As a byproduct, the mass of the triply bottom hybrid baryon state is extracted to be around M_{bbbg}= 14.62–14.82 GeV. The contributions up to dimension eight at the leading order of alpha _s (LO) in the operator product expansion are taken into account in the calculation. The triply charmed hybrid baryon predicted in this work can decay into one doubly charmed baryon and one charmed meson. Especially, we propose to search for cccg hybrid baryon with J^{P}= (1/2)^+ in the P-wave decay channels Xi _{cc}^{++} D^0, Xi _{cc}^{+} D^+, and Xi _{ccs}^{+} D_s^+, which may be accessible in future BelleII, Super-B, PANDA, and LHCb experiments.

Magnetic moments of spin–1/2 triply heavy baryons: a study of light-cone QCD and quark–diquark model

In this study, the magnetic moments of the spin-1/2 triply-heavy baryons have been calculated using both light-cone QCD sum rules and Quark-diquark model. Theoretical investigations on magnetic moments of the triply-heavy baryons, are crucial as their results can help us better understand their internal structure and the dynamics of the QCD as the theory of the strong interaction. We compare the results extracted for the magnetic moment with the existing theoretical predictions. It is seen that the obtained magnetic moment values are quite compatible with the results in the literature.

Deciphering weak decays of triply heavy baryons by SU(3) analysis

Baryons with three heavy quarks are the last missing pieces of the lowest-lying baryon multiplets in the quark model after the discovery of doubly heavy baryons. In this work, we study nonleptonic weak decays of triply heavy baryons Omega _{ccc}^{++}, Omega _{bbb}^{-}, Omega _{ccb}^{+}, and Omega _{cbb}^{0}. Decay amplitudes for various processes have been parametrized in terms of the SU(3) irreducible nonperturbative amplitudes. A number of relations for the partial decay widths can be deduced from these results that can be examined in future. Some decay channels and cascade decay modes which likely to be used to reconstruct the triply heavy baryons have been also listed.

NLO effects for Ω QQQ baryons in QCD Sum Rules * *Supported in part by the National Natural Science Foundation of China (11875071, 11975029) and the National Key Research and Development Program of China (2020YFA0406400)

We study the triply heavy baryons in the QCD sum rules by performing the first calculation of the next-to-leading order (NLO) contribution to the perturbative QCD part of the correlation functions. Compared with the leading order (LO) result, the NLO contribution is found to be very important to the . This is because the NLO not only results in a large correction but also reduces the parameter dependence, making the Borel platform more distinct, especially for the in the scheme, where the platform appears only at NLO but not at LO. Particularly, owing to the inclusion of the NLO contribution, the renormalization schemes ( and On-Shell) dependence and the scale dependence are significantly reduced. Consequently, after including the NLO contribution to the perturbative part in the QCD sum rules, the masses are estimated to be GeV for and GeV for , where the results are obtained at with errors including those from the variation of the renormalization scale μ in the range . A careful study of the μ dependence in a wider range is further performed, which shows that the LO results are very sensitive to the choice of μ whereas the NLO results are considerably better. In addition to the result, a more stable value, (4.75-4.80) GeV, for the mass is found in the range of , which should be viewed as a more relevant prediction in our NLO approach because of dependence.

The excited states of triply-heavy baryons in QCD sum rules

Using the most general form of baryonic interpolating current, the masses and pole residues of the excited 2S and 1P states of the triply-heavy baryons $$\Omega _{\mathrm{{bbc}}}$$ and $$\Omega _{\mathrm{{ccb}}}$$ are calculated within the QCD sum rule approach. The obtained results are compared with the existing theoretical predictions in the literature.

Pentaquark states with the QQQqbar{q} configuration in a simple model

We discuss the mass splittings for the S-wave triply heavy pentaquark states with the QQQqbar{q}(Q=b,c;q=u,d,s) configuration which is a mirror structure of Qbar{Q}qqq. The latter configuration is related with the nature of P_c(4380) observed by the LHCb Collaboration. The considered pentaquark masses are estimated with a simple method. One finds that such states are probably not narrow even if they do exist. This leaves room for molecule interpretation for a state around the low-lying threshold of a doubly heavy baryon and a heavy-light meson, e.g. Xi _{cc}D, if it were observed. As a by product, we conjecture that upper limits for the masses of the conventional triply heavy baryons can be determined by the masses of the conventional doubly heavy baryons.

Ground and Excited State Masses of the $$\varOmega _\textit{bbc}$$ Ω bbc Baryon

In this paper, we will discuss the triply heavy baryon $$\varOmega _\textit{bbc}$$ . This baryon is experimentally unknown till the date. We use hypercentral constituent quark model with Coulomb plus linear potential along with (1/m) correction to it. We extract the masses from S state to F state and present them with all iso-spin splittings. We also plot the Regge trajectories and determined slope and intercepts. Ground state magnetic moments are also calculated.

Spectroscopy of the Ωccb baryon in the hypercentral constituent quark model

We extract the mass spectrum of the triply heavy baryon using the hypercentral constituent quark model. The first order correction is also added to the potential term of the Hamiltonian. The radial and orbital excited state masses are determined, and the Regge trajectories and magnetic moments for this baryon are also given.

Polarized heavy baryon production in quark-diquark model considering two different scenarios

At sufficiently large transverse momentum, the dominant production mechanism for heavy baryons is actually the fragmentation. In this work, we first study the direct fragmentation of a heavy quark into the unpolarized triply heavy baryons in the leading order of perturbative QCD. In a completely different approach, we also analyze the two-stage fragmentation of a heavy quark into a scalar diquark followed by the fragmentation of such a scalar diquark into a triply heavy baryon: quark-diquark model of baryons. The results of this model are in acceptable agreement with those obtained through a full perturbative regime. Relying on the quark-diquark model and considering two different scenarios we determine the spin-dependent fragmentation functions of polarized heavy baryons in such a way that a vector or a pseudoscalar heavy diquark is an intermediate particle between the initial heavy quark and the final state baryon.

Doubly heavy baryon spectra guided by lattice QCD

This paper provides results for the ground state and excited spectra of three-flavored doubly heavy baryons, $bcn$ and $bcs$. We take advantage of the spin-independent interaction recently obtained to reconcile the lattice SU(3) QCD static potential and the results of nonperturbative lattice QCD for the triply heavy baryon spectra. We show that the spin-dependent potential might be constrained on the basis of nonperturbative lattice QCD results for the spin splittings of three-flavored doubly heavy baryons. Our results may also represent a challenge for future lattice QCD work, because a smaller lattice error could help in distinguishing between different prescriptions for the spin-dependent part of the interaction. Thus, by comparing with the reported baryon spectra obtained with parameters estimated from lattice QCD, one can challenge the precision of lattice calculations. The present work supports a coherent description of singly, doubly and triply heavy baryons with the same Cornell-like interacting potential. The possible experimental measurement of these states at LHCb is an incentive for this study.

Constituent-quark model description of triply heavy baryon nonperturbative lattice QCD data

This paper provides results for the spectra of triply charmed and bottom baryons based on a constituent-quark model approach. We take advantage of the assumption that potential models are expected to describe triply heavy baryons to a similar degree of accuracy as the successful results obtained in the charmonium and bottomonium sectors. The high precision calculation of the ground state and positive and negative parity excited states recently reported by nonperturbative lattice QCD provides us with a unique opportunity to confront model predictions with the data. This comparison may also help to build a bridge between two difficult to reconcile lattice QCD results, namely, the lattice SU(3) QCD static three-quark potential and the recent results of nonperturbative lattice QCD for the triply heavy baryon spectra.

Triply Heavy Baryon Mass Estimated Within pNRQCD

Potential-NRQCD offers an effective-theory based approach to heavy-quark physics. While meson Q-anti_Q computations are tractable in pure alpha_s-perturbation theory, more complex many-body quark systems transcend it. A possibility inherited from nuclear physics is to employ the perturbative static potentials in a numerical diagonalization, eventually obtaining the exact lowest eigenvalue in each channel for a given-order perturbative potential. The power counting is manifest in the potential instead of the spectrum. The NNLO-potential for the 3-body problem is already available, so we have addressed triply-heavy baryons in this initial work with a computer-aided 2-parameter variational treatment.

Analysis of the Triply Heavy Baryon States with QCD Sum Rules

In this article, we study the (1/2)± and (3/2)± triply heavy baryon states in a systematic way by subtracting the contributions from the corresponding (1/2)∓ and (3/2)∓ triply heavy baryon states with the QCD sum rules, and make reasonable predictions for their masses.

A first estimate of triply heavy baryon masses from the pNRQCD perturbative static potential

Within pNRQCD we compute the masses of spin-averaged triply heavy baryons using the now-available NNLO pNRQCD potentials and three-body variational approach. We focus in particular on the role of the purely three-body interaction in perturbation theory. This we find to be reasonably small and of the order 25 MeV. Our prediction for the Ω ccc baryon mass is 4900(250) MeV in keeping with other approaches. We propose to search for this hitherto unobserved state at B factories by examining the end point of the recoil spectrum against triple charm.

Triply heavy baryons and heavy quark spin symmetry

We study the semileptonic $b\ensuremath{\rightarrow}c$ decays of the lowest-lying triply heavy baryons made from $b$ and $c$ quarks in the limit ${m}_{b}$, ${m}_{c}\ensuremath{\gg}{\ensuremath{\Lambda}}_{\mathrm{QCD}}$ and close to the zero-recoil point. The separate heavy-quark spin symmetries strongly constrain the matrix elements, leading to single form factors for $ccb\ensuremath{\rightarrow}ccc$, $bbc\ensuremath{\rightarrow}ccb$, and $bbb\ensuremath{\rightarrow}bbc$ baryon decays. We also study the effects on these systems of using a $Y$-shaped confinement potential, as suggested by lattice QCD results for the interaction between three static quarks.

Production of triply heavy baryons at LHC

Triply heavy baryons are very interesting hadrons to be explored for they provide particular information about strong interactions, hadron structures, and weak decays of heavy baryons. We calculate the hadronic production cross sections of the Ω ccc and the Ω ccb , which are dominated by the gg fusion subprocesses containing 4362 and 1454 Feynman diagrams, respectively. A method for generating and calculating tree level Feynman diagrams automatically is developed to deal with complicated processes containing so many diagrams. Our results show that 104 − 105 events of triply heavy baryons can be accumulated for 10 fb −1 integrated luminosity at LHC. Signatures of the triply heavy baryons are pointed out, with emphasis on the decay modes Ω ccc → Ω sss + 3π + and Ω ccb → Ω sss + 3π + + π −. We conclude that it is quite promising to discover them at LHC.

Prediction of theΩbbbmass from lattice QCD

The mass of the triply-heavy baryon ${\ensuremath{\Omega}}_{bbb}$ is calculated in lattice QCD with $2+1$ flavors of light sea quarks. The $b$ quark is implemented with improved lattice nonrelativistic QCD. Gauge field ensembles from both the RBC/UKQCD and MILC collaborations with lattice spacings in the range from 0.08 fm to 0.12 fm are used. The final result for the ${\ensuremath{\Omega}}_{bbb}$ mass, which includes an electrostatic correction, is $14.371\ifmmode\pm\else\textpm\fi{}{0.004}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}{0.011}_{\mathrm{syst}}\ifmmode\pm\else\textpm\fi{}{0.001}_{\mathrm{exp}}\text{ }\text{ }\mathrm{GeV}$. The hyperfine splitting between the physical $J=3/2$ state and a fictitious $J=1/2$ state is also calculated.