Singly heavy baryons with chiral partner structure in a three-flavor chiral model

Abstract

We construct an effective hadronic model including single heavy baryons (SHBs) belonging to the (3, 3) representation under SU(3)L × SU(3)R symmetry, respecting the chiral symmetry and heavy-qaurk spin-flavor symmetry. When the chiral symmetry is spontaneously broken, the SHBs are divided into the baryons with negative parity of3 representation under SU(3) flavor symmetry which is the chiral partners to the ones with positive parity of 6 representation. We determine the model parameters from the available experimental data for the masses and strong decay widths of Σ ( * ) c , Λc (2595), Ξc(2790), and Ξc(2815). Then, we predict the masses and strong decay widths of other baryons including Ξ b with negative parity. We also study radiative decays of SHBs including

Chiral effective theory of diquarks and the UA(1) anomaly

“…As the diquarks are not directly observed, we may instead consider a singly heavy baryon, a bound state of a diquark with a heavy quark Q (charm or bottom) [28,29]. Corresponding baryons are Λ Q , and Ξ Q with spin-parity 1/2 + and 1/2 − .…”

Studies of excited heavy flavor states at CMS (12'+3')

“…Spectroscopy and cross section measurements of the states containing heavy-flavour quarks can probe various theoretical predictions. Different models predict a spectrum of excited Ξ b baryons [1,2], as well as a family of B +…”

The $1D$, $2D$ $Ξ_{b}$ and $Λ_{b}$ baryons

“…Very recently, LHCb collaboration reported the observation of two new excited Ξ b states in the Λ b K − π + mass spectrum [18]. The measured masses and widths are m Ξ b (6327) = 6327.28 +0.23 −0.21 (stat)±0.08(syst)±0.24(m Λb ) MeV Γ Ξ b (6327) < 2.20 MeV m Ξ b (6333) = 6332.69 +0.17 People have adopted many theoretical methods/models in the past decades to investigate the bottom baryons, including quark model [12,[14][15][16], heavy hadron chiral perturbation theory [42][43][44][45][46][47], 3 P 0 decay model [48][49][50][51][52][53][54], lattice QCD [55][56][57][58], light cone QCD sum rules [59][60][61][62][63][64][65][66] and QCD sum rules [67][68][69][70][71][72][73][74][75][76], etc. For more discussions about the bottom baryon states, one can consult the Refs.…”