Magnetic moments of charmed baryons. I

Choudhury, A. L.; Joshi, Vishal

doi:10.1103/physrevd.13.3115

Cited by 39 publications

(19 citation statements)

References 27 publications

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“…In the tables, we have presented the explicit results for the valence, sea and orbital contributions to the magnetic moments. We have also compared our results with the predictions of NRQM [4], Lattice QCD [43] and recent experimental data available [3]. Since there is no experimental information available for charmed baryon magnetic moments, we have presented the predictions of QCD sum rules (QCDSR) [12], QCD Spectral sum rules (QSSR) [13], Light Cone QCD sum rules (LCQSR) [14][15][16].…”

Section: Input Parametersmentioning

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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Section: Input Parametersmentioning

confidence: 99%

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

et al. 2010

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“…5 Note that, the Jastrow form assumes a factorization of the wave function in three terms, each of them depends only on one of the involved variables r 1 , r 2 and r 12 . Dependences of the type r 1 − r 2 , mentioned in the discussion of Eq.…”

Section: Variational Wave Functionsmentioning

confidence: 99%

“…Prior, and at around, the time the charmed baryons existence was confirmed [1] a great theoretical activity developed in order to understand and predict their masses [2,3,4], magnetic moments [5], or decay properties [6,7,8]. This activity continued in the following decades.…”

Section: Introductionmentioning

confidence: 99%

Charmed and bottom baryons: a variational approach based on heavy quark symmetry

et al. 2004

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The use of Heavy Quark Symmetry to study bottom and charmed baryons leads to important simplifications of the non-relativistic three body problem, which turns out to be easily solved by a simple variational ansatz. Our simple scheme reproduces previous results (baryon masses, charge and mass radii, · · ·) obtained by solving the Faddeev equations with simple non-relativistic quark-quark potentials, adjusted to the light and heavy-light meson spectra. Wave functions, parameterized in a simple manner, are also given and thus they can be easily used to compute further observables. Our method has been also used to find the predictions for strangeness-less baryons of the SU(2) chirally inspired quark-quark interactions. We find that the one pion exchange term of the chirally inspired interactions leads to relative changes of the Λ b and Λc binding energies as large as 90%.

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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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Magnetic moments of charmed baryons. I

Cited by 39 publications

References 27 publications

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

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

Charmed and bottom baryons: a variational approach based on heavy quark symmetry

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

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