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

Abstract

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.

Strong and radiative decays of DΞ molecular state and newly observed Ωc states

“…With the coupling constants obtained by composition condition, the decays through hadronic loops are calculated in a phenomenological effective Lagrangian approach.The total decay widths can be well reproduced with the assumption that the Ω * c (3119) or Ω * c (3050) as S -wave ΞD bound state with J p = 1/2 − , which decay channels are S −wave Ξ c K, Ξ It is interesting to compare our results with those in Refs. [10,[14][15][16][17][18][19]. According to Ref.…”

“…[13], it was found that four sscqq states with J P = 1/2 − or J P = 3/2 − have masses close to the newly observed Ω * c states. In the chiral quark-soliton model, pentaquark-like structures were suggested for the Ω * c (3050) and Ω * c (3119) [14,15]. Since the Ξ ′ cK and ΞD thresholds fall in the mass region of the LHCb observed Ω * c states, hadronic molecule interpretations can not be excluded.…”

Heavy baryon decay widths in the large $$N_c$$ N c limit in chiral theory

“…In Refs. [3,4] we have proposed to interpret these two narrow states as exotic pentaquarks using as a guidance the Chiral Quark Soliton Model [5] (χ QSMfor review see Refs. [6,7]).…”

“…In Refs. [3,4,17] a phenomenological analysis of heavy baryon properties has been performed in the framework of the χ QSM (see also [18][19][20]). It turned out that all decay widths have been very well reproduced [4], also the two narrowest ones of the putative pentaquarks.…”

Excited $$\varOmega _b$$ baryons and fine structure of strong interaction

“…These excited Ω c and Ω b states are good candidates of Pwave charmed and bottom baryons. To understand them, many phenomenological methods and models have been applied, such as various quark models [13][14][15][16][17][18][19][20][21][22][23][24][25][26], the chiral perturbation theory [27,28], the molecular model [29][30][31][32][33][34][35][36], Lattice QCD [37,38], and QCD sum rules [39][40][41][42][43][44][45][46][47][48][49][50][51], etc. We refer to reviews [7,[52][53][54] and references therein for their recent progress.…”