Magnetic moments of the doubly charmed and bottom baryons

Li, Hao-Song; Meng, L.; Liu, Zhan-Wei; Zhu, Shi-Lin

doi:10.1103/physrevd.96.076011

Cited by 63 publications

(55 citation statements)

References 63 publications

(39 reference statements)

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“…There is a factor 2 discrepancy between our work and Ref [28]. in the vertex definitions involving g A , leading to an overall factor 4 difference in the analytic heavy-baryon results.…”

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confidence: 79%

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Electromagnetic form factors of spin- 1/2 doubly charmed baryons

2018

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We study the electromagnetic form factors of the doubly charmed baryons, using covariant chiral perturbation theory within the extended on-mass-shell (EOMS) scheme. Vector-meson contributions are also taken into account. We present results for the baryon magnetic moments, charge and magnetic radii. While some of the chiral Lagrangian parameters could be set to values determined in previous works, the available lattice results for Ξ + cc and Ω + cc only allow for robust constraints on the low-energy constant (LEC) combination, c 89 (= − 1 3 c 8 + 4c 9 ). The couplings of the doubly charmed baryons to the vector mesons have been estimated assuming the Okubo-Zweig-Iizuka (OZI) rule. We also give the expressions for the form factors of the double beauty baryons considering the masses predicted in the framework of quark models. A comparison of our results with those obtained in heavy baryon chiral perturbation theory (HBChPT) at the same chiral order is made. * hillerbl@uni-mainz.de † LHCb [7] could confirm the existence of this state.On the other hand, the mass of Ξ ++ cc measured by LHCb is greater by more than 100 MeV than that of the Ξ + cc (3520) particle. This large splitting, if confirmed, would suggest that the two states are not isospin partners [8] and thus could belong to different multiplets.The scarce and conflicting experimental information has not deterred the theoretical research on the topic. Since the early works predicting the existence of doubly charmed baryons [9, 10], soon after the discovery of hidden (cc) charm states, these particles have been studied in quark models, QCD sum rules, lattice simulations, effective theories implementing heavy quark spin symmetry, etc. See, e.g., Refs. [11,12]. Most of those works address the spectroscopy of these baryons.Besides, other matters such as their decays [13-16] and electromagnetic properties have been abundantly studied. For instance, diverse quark models [17][18][19][20][21][22][23][24], the MIT bag model [25,26], the skyrmion model [27], HBChPT [28] and ChPT within the EOMS scheme [29] have been applied to study the magnetic moments of doubly charmed baryons. Both, the magnetic and the electric form factors (FF) have also been investigated in lattice QCD [30][31][32]. As expected, the lattice results show that the doubly charmed baryons have smaller radii than the singly charmed ones and than those composed of only light quarks such as the proton. However, there is some tension between the lattice results for magnetic moments and those determined in other theoretical models [31].Here, we focus on these FF, which are a quite interesting probe, as they offer an insight on the hadron structure and how its constituents are distributed.Our work is based on chiral perturbation theory (ChPT) [33][34][35][36], which provides a model independent and systematic framework to study the non-perturbative regime of the strong interaction at low energies or for soft probes. Furthermore, it is well suited to analyse the lattice data at quark(meson) masses different...

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“…There is a factor 2 discrepancy between our work and Ref [28]. in the vertex definitions involving g A , leading to an overall factor 4 difference in the analytic heavy-baryon results.…”

contrasting

confidence: 79%

“…The tree diagram contributions are the same for Ξ + cc and Ω + cc . For the loop terms, we show the analytic expression of the leading-order heavy-baryon expansion, which reproduces the findings of Ref [28]. 3 , and compare the numerical results in HB with the covariant EOMS scheme.…”

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confidence: 72%

Electromagnetic form factors of spin- 1/2 doubly charmed baryons

2018

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“…The electromagnetic properties and radiative decays of the doubly heavy baryons have been discussed in Refs. [10][11][12][13][14]. The possible bound states composed of the doubly charmed baryons were investigated in Refs.…”

Section: Introductionmentioning

confidence: 99%

Light pseudoscalar meson and doubly charmed baryon scattering lengths with heavy diquark-antiquark symmetry

Meng

Zhu

2019

Phys. Rev. D

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We adopt the heavy baryon chiral perturbation theory (HBChPT) to calculate the scattering lengths of φB ( * ) cc up to O(p 3 ), where φ is the pseudoscalar mesons. The recoil effect and the mass splitting between the spin-1 2 and spin-3 2 doubly charmed baryons are included. In order to give the numerical results, we construct the chiral Lagrangians with heavy diquark-antiquark (HDA) symmetry in a formally covariant approach. Then, we relate the low energy constants (LECs) of the doubly charmed baryons to those of D ( * ) mesons. The LECs for the φD ( * ) scattering are estimated in two scenarios, fitting lattice QCD results and using the resonance saturation model. The chiral convergence of the first scenario is not good enough due to the the large strange quark mass and the presence of the possible bound states, virtual states and resonance. The final results for two scenarios are consistent with each other. The interaction for the [πΞ ( * ) cc ] (1/2) , [KΞ ( * ) cc ] (0) , [KΩ ( * ) cc ] (1/2) , [ηΞ ( * ) cc ] (1/2) , [ηΩ ( * ) cc ] (0) and [KΞ ( * ) cc ] (0) channels are attractive. The most attractive channel [KΞ ( * ) cc ] (0) may help to form the partner states of the D * s0 (2317) (Ds1 (2460)) in the doubly heavy sector.

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“…In this line, experimental and theoretical efforts, during the past years, have been dedicated to the study of doubly charmed baryons, like Ξ þ cc , Ξ þþ cc , Ω þ cc (see, for example, Refs. [3][4][5][6][7][8][9][10][11][12][13][14][15][16]), and doubly charmed mesons, like the T cc family and others (see, for example, Refs. [17][18][19][20][21][22][23][24][25][26][27]).…”

Section: Introductionmentioning

confidence: 99%

Bound state formation in the DDK system

2019

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We study the DDK system in a coupled channel approach, by including DD s η and DD s π, and find that the dynamics involved in the system forms a bound state with isospin 1=2 and mass 4140 MeV when one of the DK pair is resonating in isospin 0, forming the D Ã s0 ð2317Þ. The state can be interpreted as a DD Ã s0 ð2317Þ molecule like state with exotic quantum numbers: doubly charged, doubly charmed, and with single strangeness.

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Magnetic moments of the doubly charmed and bottom baryons

Cited by 63 publications

References 63 publications

Electromagnetic form factors of spin- 1/2 doubly charmed baryons

Electromagnetic form factors of spin- 1/2 doubly charmed baryons

Light pseudoscalar meson and doubly charmed baryon scattering lengths with heavy diquark-antiquark symmetry

Bound state formation in the DDK system

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