Λb(6146)0 state newly observed by LHCb

Abstract

We study the bottom Λ b ð6146Þ 0 baryon, newly discovered by the LHCb Collaboration. By adopting an interpolating current of ðL ρ ; L λ Þ ¼ ð0; 2Þ type and D-wave nature with spin-parity quantum numbers J P ¼ 3 2 þ for this heavy bottom baryon, we calculate its mass and residue. Using these spectroscopic parameters, we also investigate its dominant decays Λ b ð6146Þ 0 → Σ b π and Λ b ð6146Þ 0 → Σ Ã b π and estimate the width of Λ b ð6146Þ 0 obtained via these channels. The obtained mass, m Λ b ¼ ð6144 AE 68Þ MeV is in accord nicely with the experimental data. The width obtained via the dominant channels is also consistent with the experimental data of LHCb collaboration. We calculate the spectroscopic parameters and the same decay channels for the c-partner of Λ b ð6146Þ 0 state, namely Λ c ð2860Þ þ , as well. We compare the obtained results with the existing theoretical predictions as well as experimental data. The results indicate that the state Λ b ð6146Þ 0 and its charmed-partner Λ c ð2860Þ þ can be considered as 1D-wave baryons with J P ¼ 3 2 þ .

Determination of the possible quantum numbers for the newly observed $Ξ_b(6227)^0$ state

“…Among this theoretical models were the various quark models [9][10][11][12][13][14][15][16][17][18][19] searching their mass spectrum and decay mechanisms [20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Their masses and decays were investigated via QCD sum rule method [34][35][36][37][38][39][40][41][42], light cone QCD sum rule method [43][44][45][46][47][48][49][50][51][52][53], 3 P 0 model [54][55][56][57]…”

Spectra and decay properties of $Λ_b$ and $Σ_b$ baryons

“…The mass spectra of singly bottom baryons have been studied in different approaches: QCD sumrules [9,10,11], hypercentral constituent quark model [12,13], relativistic quark-diquark model [14], relativistic flux tube model [15], relativistic quark potential model [16],rotating QCD string model [17], nonrelativistic two-body potential model with hybrid approach [18], heavy quark limit in the one-boson exchange potential [20], the chiral quark model [21], lattice QCD [22,23,24,25,26], HQET(heavy quark effective theory) [27] etc. In this paper, the masses of radial and orbital states of non-strange singly bottom baryons have been calculated using hypercentral constituent quark model (hCQM), a non-relativistic approach with employing screening potential as confining potential.…”

Determination of the possible quantum numbers for the newly observed Ξb(6227)0 state

“…Among this theoretical models were the various quark models [9][10][11][12][13][14][15][16][17][18][19] searching their mass spectrum and decay mechanisms [20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Their masses and decays were investigated via QCD sum rule method [34][35][36][37][38][39][40][41][42], light cone QCD sum rule method [43][44][45][46][47][48][49][50][51][52][53], 3 P 0 model [54][55][56][57]…”