Magnetic moments of baryons with a single heavy quark

Scholl, Stephan; Weigel, H.

doi:10.1016/j.nuclphysa.2004.01.132

Cited by 29 publications

(28 citation statements)

References 71 publications

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“…The mass spectrum of the heavy baryons has been studied using various methods including heavy quark effective theory [2], QCD sum rules [3][4][5][6] and some other phenomenological models [7][8][9][10][11][12]. Some electromagnetic properties of the heavy baryons and their radiative decays have been investigated in different frameworks in [6,[13][14][15][16][17][18][19][20][21][22][23][24]. The strong decays of the heavy baryons have also been in the focus of much attention, theoretically (see for instance [25][26][27] and references therein).…”

Section: Introductionmentioning

confidence: 99%

Light cone QCD sum rules study of the semileptonic heavy ΞQ and Ξ′Q transitions to Ξ and Σ baryons

2012

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The semileptonic decays of heavy spin-1/2, Ξ b(c) and Ξ ′ b(c) baryons to the light spin-1/2, Ξ and Σ baryons are investigated in the framework of light cone QCD sum rules. In particular, using the most general form of the interpolating currents for the heavy baryons as well as the distribution amplitudes of the Ξ and Σ baryons, we calculate all form factors entering the matrix elements of the corresponding effective Hamiltonians in full QCD. Having calculated the responsible form factors, we evaluate the decay rates and branching fractions of the related transitions. PACS number(s): 11.55. Hx, 13.30.Ce, 14.20.Mr, 14.20 Such an experimental progress stimulates the theoretical studies on properties of the heavy baryons as well as their electromagnetic, weak and strong transitions. The mass spectrum of the heavy baryons has been studied using various methods including heavy quark effective theory [2], QCD sum rules [3][4][5][6] and some other phenomenological models [7][8][9][10][11][12]. Some electromagnetic properties of the heavy baryons and their radiative decays have been investigated in different frameworks in [6,[13][14][15][16][17][18][19][20][21][22][23][24]. The strong decays of the heavy baryons have also been in the focus of much attention, theoretically (see for instance [25][26][27] and references therein).However, the weak and semileptonic decays of heavy baryons are very important frameworks not only in obtaining information about their internal structure, precise calculation of the main ingredients of standard model (SM) such as Kabbibbo-Kobayashi-Maskawa (CKM) matrix elements and answering to some fundamental questions like nature of the CP violation, but also in looking for new physics beyond the SM. The loop level semileptonic transitions of the heavy baryons containing single heavy quark to light baryons induced by the flavor changing neutral currents (FCNC) are useful tools, for instance, to look for the supersymmetric particles, light dark matter, fourth generation of the quarks and extra dimensions etc. [28,29]. Some semileptonic decay channels of the heavy baryons have been previously investigated in different frameworks (see for instance [30][31][32][33][34][35][36][37][38] and references therein).The present work deals with the semileptonic decays of heavy Ξ b(c) and Ξ ′ b(c) baryons to the light Ξ and Σ baryons. The considered channels are either at loop level described by twelve form factors in full QCD or at tree level analyzed by six form factors entering the transition matrix elements of the corresponding low energy Hamiltonian. Here, we should mention that by the "full QCD" we refer to the QCD theory without any approximation like heavy quark effective theory (HQET) so we take the mass of heavy quarks finite. In HQET approximation, the number of form factors describing the considered transitions reduce to only two form factors [39,40]. The considered processes take place in low energies far from the perturbative region, so to calculate the form factors as the main ingredie...

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Section: Introductionmentioning

confidence: 99%

Light cone QCD sum rules study of the semileptonic heavy ΞQ and Ξ′Q transitions to Ξ and Σ baryons

2012

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“…Calculations based on different realizations of spin-flavor symmetries have been done in the non-relativistic quark model (NRQM) [4] which have been further extended to incorporate the confinement [5], chiral symmetry with exchange currents [6] and Poincare covariance [7]. The charmed baryons magnetic moments have been investigated in the Skyrme model [8] and the bound state approach [9] considering the heavy baryons as heavy mesons bound in the field of light baryons. Recently, the charmed baryons magnetic moments have been calculated in the relativistic three-quark model where the internal quark structure of baryons is modeled by three-quark currents [10].…”

Section: Introductionmentioning

confidence: 99%

Spin12+, spin32+, and transition magnetic moments of low lying and charmed baryons

et al. 2010

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Magnetic moments of the low lying and charmed spin 1 2 + and spin 3 2 + baryons have been calculated in the SU(4) chiral constituent quark model (χCQM) by including the contribution from cc fluctuations. Explicit calculations have been carried out for the contribution coming from the valence quarks, "quark sea" polarizations and their orbital angular momentum. The implications of such a model have also been studied for magnetic moments of the low lying spin 3 2 + → 1 2 + and 1 2 + → 1 2 + transitions as well as the transitions involving charmed baryons. The predictions of χCQM not only give a satisfactory fit for the baryons where experimental data is available but also show improvement over the other models. In particular, for the case of µ(p), µ(Σ + ), µ(Ξ 0 ), µ(Λ), Coleman-Glashow sum rule for the low lying spin 1 2 + baryons and µ(∆ + ), µ(Ω − ) for the low lying spin 3 2 + baryons, we are able to achieve an excellent agreement with data. For the spin 1 2 + and spin 3 2 + charmed baryon magnetic moments, our results are consistent with the predictions of the QCD sum rules, Light Cone sum rules and Spectral sum rules. For the cases where "light" quarks dominate in the valence structure, the sea and orbital contributions are found to be fairly significant however, they cancel in the right direction to give the correct magnitude of the total magnetic moment. On the other hand, when there is an excess of "heavy" quarks, the contribution of the "quark sea" is almost negligible, for example, µ(Ω 0 c )

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“…Magnetic moments of the bottom baryon sextet with spin 1/2 in units of the nuclear magneton µN .model with the bound-state approach was employed. Reference[47] extended the model used in Ref [46],. including the vector mesons.…”

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Electromagnetic form factors of singly heavy baryons in the self-consistent SU(3) chiral quark-soliton model

Kim

2018

Phys. Rev. D

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The self-consistent chiral quark-soliton model is a relativistic pion mean-field approach in the large Nc limit, which describes both light and heavy baryons on an equal footing. In the limit of the infinitely heavy mass of the heavy quark, a heavy baryon can be regarded as Nc − 1 valence quarks bound by the pion mean fields, leaving the heavy quark as a color static source. The structure of the heavy baryon in this scheme is mainly governed by the light-quark degrees of freedom. Based on this framework, we evaluate the electromagnetic form factors of the lowest-lying heavy baryons. The rotational 1/Nc and strange current quark mass corrections in linear order are considered. We discuss the electric charge and magnetic densities of heavy baryons in comparison with those of the nucleons. The results of the electric charge radii of the positive-charged heavy baryons show explicitly that the heavy baryon is a compact object. The electric form factors are presented. The form factor of Σ ++ c is compared with that from a lattice QCD. We also discuss the results of the magnetic form factors. The magnetic moments of the baryon sextet with spin 1/2 and the magnetic radii are compared with other works and the lattice data.

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Magnetic moments of baryons with a single heavy quark

Cited by 29 publications

References 71 publications

Light cone QCD sum rules study of the semileptonic heavy ΞQ and Ξ′Q transitions to Ξ and Σ baryons

Light cone QCD sum rules study of the semileptonic heavy ΞQ and Ξ′Q transitions to Ξ and Σ baryons

Spin12+, spin32+, and transition magnetic moments of low lying and charmed baryons

Electromagnetic form factors of singly heavy baryons in the self-consistent SU(3) chiral quark-soliton model

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