Hadronic decay properties of newly observed 
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 baryons

Zhao, Ze; Ye, Dandan; Zhang, Ailin

doi:10.1103/physrevd.95.114024

Cited by 57 publications

(48 citation statements)

References 37 publications

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“…[18][19][20][21][22][23]. Both radial and p-wave excitations have been also studied in the framework of the QCD sum rules [24][25][26][27][28], in a phenomenological approach [29] and on the lattice [30]. A nonperturbative holographic QCD has been applied to investigate heavy, regular, and exotic baryons in Refs.…”

Section: Introductionmentioning

confidence: 99%

Strong decays of exotic and nonexotic heavy baryons in the chiral quark-soliton model

et al. 2017

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In the large N c limit both heavy and light baryons are described by the universal mean field, which allows us to relate the properties of heavy baryons to light ones. With the only input from the decays of light octet baryons (due to the universality of the chiral mean field), excellent description of strong decays of both charm and bottom sextets is obtained. The parameter-free prediction for the widths of exotic antidecapentaplet (15) baryons is also made. The exotic heavy baryons should be anomalously narrow despite of large phase space available. In particular, the widths of Ω c (3050) and Ω c (3119), interpreted as members of 15-plet, are very small: 0.48 MeV and 1.12 MeV respectivly. This result is in very good agreement with the measurements of the LHCb Collaboration and provides natural and parameter-free explanation of the LHCb observation that Ω c (3050) and Ω c (3119) have anomalously small widths among five recently observed states.

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Section: Introductionmentioning

confidence: 99%

Strong decays of exotic and nonexotic heavy baryons in the chiral quark-soliton model

et al. 2017

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“…While this paper was submitted, there are studies of the masses or (and) decay properties of the newly observed Ω 0 c (X) states using different approaches: the QCD sum rules [38][39][40][41][42], heavy hadron chiral perturbation theory [43], the chiral quark-soliton model [44], and lattice QCD [45], the constituent quark models and treatment as pentaquarks [46,47].…”

Section: Resultsmentioning

confidence: 99%

Interpretation of the newly observed Ωc0 resonances

Wang

Zhu

2017

Phys. Rev. D

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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: 99%

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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Hadronic decay properties of newly observed Ωc baryons

Abstract: Hadronic decay widths of the newly observed charmed strange baryons, Ωc(3000) 0 , Ωc(3050) 0 , Ωc(3066) 0 , Ωc(3090) 0 and Ωc(3119) 0 have been calculated in a 3 P0 model. Our results indicate that Ωc(3066) 0 and Ωc(3090) 0 can be interpreted as the 1P −wave Ωc2( 3

Cited by 57 publications

References 37 publications

Strong decays of exotic and nonexotic heavy baryons in the chiral quark-soliton model

Strong decays of exotic and nonexotic heavy baryons in the chiral quark-soliton model

Interpretation of the newly observed Ωc0 resonances

Very narrow excited Ωc baryons

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