$$\Omega _c$$
                
                  
                    
                      Ω
                      c
                    
                  
                
               excited states within a 
                
                  
                
                $$\mathrm{SU(6)}_{\mathrm{lsf}}\times $$
                
                  
                    
                      
                        
                          SU
                          (

Nieves, J.; Pavao, R.; Tolós, Laura

doi:10.1140/epjc/s10052-018-5597-3

Cited by 34 publications

(48 citation statements)

References 49 publications

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“…Allowing for just moderately changes, we find that for α = 1.16 the two last states (d and e in Table 1) are now located near the experimental Ω c (3000) and Ω c (3050) (see Table 2). The state with mass 2999.9 MeV is mainly generated by Ξ + cK , whereas the state at 3036.3 MeV has a dominant Ξ * cK component that can be reconciled with the experimental decay Ξ + c K − if we allow for Ξ * cK → Ξ c K d−wave transition [15]. Given our results, we need to explore a different RS to evaluate the impact of the renormalization procedure in the predictions of Ω ( * ) c in a controlled manner.…”

Section: One-subtraction Renormalizationmentioning

confidence: 71%

“…[6]. We label them from a to e, according to their energy position (taken from [15] Table 2: Ω c and Ω * c excited states obtained using α = 1.16 (taken from [15]).…”

Section: Unitarized Baryon-meson Model With Su(6) × Hqss Weinberg-tommentioning

confidence: 99%

“…In order to identify our five dynamically generated Ω ( * ) c of Table 1 using the new subtraction constants, we first have to determine how their masses and widths change as we adiabatically vary Table 3: Ω c and Ω * c excited states calculated using the subtraction constants from a cutoff of Λ = 1090 MeV (taken from [15]…”

Section: Common Cutoff Regularizationmentioning

confidence: 99%

“…[6] and its impact in the generation of the five Ω ( * ) c states. We show how the pole positions can be moved up in energy by implementing a different RS, so as to make then the identification of at least three states with the experimental Ω ( * ) c states feasible [15].…”

Section: Introductionmentioning

confidence: 99%

“…The left plots are for J = 1 2 and the right ones for J = 3 2 .For the two largest values of Λ, some resonant states from less attractive SU(6) lsf ×HQSS multiplets are also visible for higher masses. This figure is taken from[15].…”

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confidence: 99%

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$\Omega_c$ excited states with heavy-quark spin symmetry

Tolós¹,

Pavao²,

Nieves³

2019

Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)

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We study the C = 1, S = −2, I = 0 sector, where five excited Ω c states have been recently observed by the LHCb Collaboration. We start from a recently developed unitarized baryon-meson model that takes, as bare baryon-meson interaction, an extended Weinberg-Tomozawa kernel consistent with both chiral and heavy-quark spin symmetries. This SU(6) × HQSS scheme leads to a successful description of the observed lowest-lying odd parity charmed Λ c (2595) and Λ c (2625) states, and bottomed Λ b (5912) and Λ b (5920) resonances. Within this model, five odd-parity Ω c states are dynamically generated, but with masses below 3 GeV, not allowing for an identification with the observed LHCb resonances. We revise this model and explore two different scenarios for the renormalization scheme, that is, using a modified common energy scale to perform the subtractions or utilizing a common ultraviolet cutoff to render finite the ultraviolet divergent loop functions in all channels. In both cases, we show that some (at least three) of the dynamically generated states can be identified with the experimental Ω c , while having odd parity and J = 1/2 or J = 3/2. Two of these states turn out to be part of the same SU(6) × HQSS multiplets as the charmed and bottomed Λ baryons.

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Section: One-subtraction Renormalizationmentioning

confidence: 71%

“…[6]. We label them from a to e, according to their energy position (taken from [15] Table 2: Ω c and Ω * c excited states obtained using α = 1.16 (taken from [15]).…”

Section: Unitarized Baryon-meson Model With Su(6) × Hqss Weinberg-tommentioning

confidence: 99%

Section: Common Cutoff Regularizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

$\Omega_c$ excited states with heavy-quark spin symmetry

Tolós¹,

Pavao²,

Nieves³

2019

Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)

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The Molecular Nature of Some $$\varOmega _c^0$$ States

Montaña

Ramos

Feijoo

2020

Recent Progress in Few-Body Physics

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A vector meson exchange model based on effective Lagrangians is used to build the meson-baryon interaction in the charm +1, strangeness −2 and isospin 0 sector. The s-wave scattering amplitudes resulting from the unitarization in coupled-channels show two resonances with masses and widths that are in very good agreement with those of the experimental Ωc(3050) 0 and Ωc(3090) 0 states observed by the LHCb collaboration. The interpretation of these resonances as pseudoscalar meson-baryon molecules would mean the assignment J P = 1/2 − to their spin-parity. c baryons under study lie near theKΞ c andKΞ c thresholds and that they have been observed in the K − Ξ + c invariant mass spectrum. FormalismThe sought resonances are dynamically generated as poles of the scattering amplitude T ij , unitarized by means of the on-shell Bethe-Salpeter equation in coupled channels, which implements the resummation of loop diagrams to infinite arXiv:1812.03898v1 [hep-ph]

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The Molecular Nature of Some Exotic Hadrons

Ramos

Feijoo²,

Llorens

et al. 2020

Few-Body Syst

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The exciting discovery by LHCb of the P c (4312) + and P c (4450) + pentaquarks, or the suggestion of a tetraquark nature for the Z c (3900) state seen at BESIII and Belle, have triggered a lot of activity in the field of hadron physics, with new experiments planned for searching other exotic mesons and baryons, and many theoretical developments trying to disentangle the true multiquark nature from their possible molecular origin. After a brief review of the present status of these searches, this paper focusses on recently seen or yet to be discovered exotic heavy baryons that may emerge from a conveniently unitarized meson-baryon interaction model in coupled channels. In particular, we will show how interferences between the different coupled-channel amplitudes of the model may reveal the existence of a N * resonance around 2 GeV having a meson-baryon quasi-bound state nature. We also discuss the possible interpretation of some of the Ω c states recently discovered at LHCb as being hadron molecules. The model also predicts the existence of doublycharmed quasibound meson-baryon Ξ cc states, which would be excited states of the ground-state Ξ cc (3621) MeV, whose mass has only been recently established. Extensions of these results to the bottom sector will also be presented. Composite Hadrons: A Brief ReviewThe basic constituents of matter in QCD are quarks and gluons. Although hadrons, the colourless objects of the theory, could be realized in many complicated combinations of the elementary constituents, the conventional

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$$\Omega _c$$ Ω c excited states within a $$\mathrm{SU(6)}_{\mathrm{lsf}}\times $$ SU (

Cited by 34 publications

References 49 publications

$\Omega_c$ excited states with heavy-quark spin symmetry

$\Omega_c$ excited states with heavy-quark spin symmetry

The Molecular Nature of Some $$\varOmega _c^0$$ States

The Molecular Nature of Some Exotic Hadrons

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