Mass spectra and Regge trajectories of , , and baryons

Shah, Zalak; Thakkar, Kaushal; Kumar, Ajay; Vinodkumar, P. C.

doi:10.1088/1674-1137/40/12/123102

Cited by 116 publications

(103 citation statements)

References 74 publications

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“…Predictions of ∼ 3000 ± 40 MeV for the negative-parity Ω c states, and an analogous range for the Ω b states, have been made by several authors [10,[15][16][17][18][19][20][21][22][23][24][25][26][27]. (The last paper treats only 2S levels, identifying the states at 3066, 3119 MeV as candidates for J P = 1/2 + , 3/2 + , respectively.…”

Section: Alternative Interpretationsmentioning

confidence: 89%

Very narrow excited Ωc baryons

2017

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Recently LHCb reported the discovery of five extremely narrow excited Ω c baryons decaying into Ξ + c K − . We interpret these baryons as bound states of a c-quark and a P -wave ss-diquark. For such a system there are exactly five possible combinations of spin and orbital angular momentum. The narrowness of the states could be a signal that it is hard to pull apart the two s-quarks in a diquark. We predict two of spin 1/2, two of spin 3/2, and one of spin 5/2, all with negative parity. Of the five states two can decay in S-wave and three can decay in D-wave. Some of the D-wave states might be narrower than the S-wave states. We discuss relations among the five masses expected in the quark model and the likely spin assignments and compare with the data. A similar pattern is expected for negative-parity excited Ω b states. An alternative interpretation is noted in which the heaviest two states are 2S excitations with J P = 1/2 + and 3/2 + , while the lightest three are those with J P = 3/2 − , 3/2 − , 5/2 − expected to decay via D-waves. In this case we expect J P = 1/2 − Ω c states around 2904 and 2978 MeV.PACS codes: 12.39. Jh, 13.20.Jf, 13.25.Jx, 14.40 The proposed values of spin-parity J P are ours. An alternative set of assignments is shown in parentheses.State Mass (MeV) a Width (MeV) Proposed J P Ω c (3000) 0 3000.4 ± 0.2 ± 0.1 4.5 ± 0.6 ± 0.3 1/2 − (3/2 − ) Ω c (3050) 0 3050.2 ± 0.1 ± 0.1 0.8 ± 0.2 ± 0.1 1/2 − (3/2 − ) < 1.2 MeV, 95% CL Ω c (3066) 0 3065.6 ± 0.1 ± 0.3 3.5 ± 0.4 ± 0.2 3/2 − (5/2 − ) Ω c (3090) 0 3090.2 ± 0.3 ± 0.5 8.7 ± 1.0 ± 0.8 3/2 − (1/2 + ) Ω c (3119) 0 3119.1 ± 0.3 ± 0.91.1 ± 0.8 ± 0.4 5/2 − (3/2 + ) < 2.6 MeV, 95% CL a Additional common error of +0.3,-0.5 MeV from M (Ξ + c ) uncertainty. I IntroductionVery recently LHCb reported the discovery of five extremely narrow excited Ω c baryons decaying into Ξ + c K − [1], with masses and widths shown in Table I. We quote also our favored spin-parity assignment for these states, which we shall choose among the 5! = 120 possible permutations if all five states are P -wave excitations of the ss diquark with respect to the charmed quark. Some more recent calculations [2-6] that appeared after the first version of this paper reach the same conclusion. In parentheses we note an alternative assignment if the two heaviest states are 2S excitations.This discovery raises some immediate questions, which we address in detail: In Sec. II we comment on P -wave css baryons. We then analyze spin-dependent forces for the css system in Sec. III, building upon similar results [7] obtained previously for the negative-parity Σ c states. We evaluate the energy cost for a P -wave css excitation in Sec. IV, carry our results over to the Ω b system in Sec. V, discuss alternative interpretations of the spectrum in Sec. VI, and conclude in Sec. VII. Details of calculating the spin-dependent mass shifts are presented in Appendix A, with a linearized approximation in Appendix B.II P -wave c(ss) system Consider the (ss) in c(ss) to be an S-wave color3 c diquark....

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Section: Alternative Interpretationsmentioning

confidence: 89%

Very narrow excited Ωc baryons

2017

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“…The magnetic moments of baryons are obtained in terms of the spin, charge and effective mass of the bound quarks as [5,23] …”

Section: Magnetic Momentsmentioning

confidence: 99%

“…Reviewing the heavy baryon sector, the ground states of singly heavy baryons and two doubly heavy baryons have been found experimentally, to date [4]. The excited state masses are well-known only for the singly heavy baryons in the charm sector [5,6]. Now, we can expect such discovery of triply heavy baryons as well.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopy of the Ω_ccbbaryon in the hypercentral constituent quark model

Shah

Kumar

2018

Chinese Phys. C

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“…are also P -wave charmed baryon candidates of the flavor 6 F [7-13]. These charmed baryons are interesting in a theoretical point of view, and many phenomenological methods/models were proposed to study them [14], such as various quark models [15][16][17][18][19][20], various dynamical models [21][22][23][24][25][26], the hyperfine interaction [27,28], and the Lattice QCD [29][30][31], etc [32][33][34][35][36]. Their productions and decay properties were studied in Refs.…”

Section: Introductionmentioning

confidence: 99%

Decay properties of P -wave charmed baryons from light-cone QCD sum rules

et al. 2017

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We study decay properties of the P -wave charmed baryons using the method of light-cone QCD sum rules, including the S-wave decays of the flavor3F P -wave charmed baryons into groundstate charmed baryons accompanied by a pseudoscalar meson (π or K) or a vector meson (ρ or K * ), and the S-wave decays of the flavor 6F P -wave charmed baryons into ground-state charmed baryons accompanied by a pseudoscalar meson (π or K). We study both two-body and three-body decays which are kinematically allowed. We find two mixing solutions from internal ρ-and λ-mode excitations, which can well describe both masses and decay properties of the Λc(2595), Λc(2625), Ξc(2790) and Ξc(2815). We also discuss the possible interpretations of P -wave charmed baryons for the

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Mass spectra and Regge trajectories of , , and baryons

Cited by 116 publications

References 74 publications

Very narrow excited Ωc baryons

Very narrow excited Ωc baryons

Spectroscopy of the Ω_ccbbaryon in the hypercentral constituent quark model

Decay properties of P -wave charmed baryons from light-cone QCD sum rules

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Mass spectra and Regge trajectories of , , and baryons

Cited by 116 publications

References 74 publications

Very narrow excited Ωc baryons

Very narrow excited Ωc baryons

Spectroscopy of the Ωccbbaryon in the hypercentral constituent quark model

Decay properties of P -wave charmed baryons from light-cone QCD sum rules

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Spectroscopy of the Ω_ccbbaryon in the hypercentral constituent quark model