Basis light-front quantization for the ${\mathrm{\Lambda }}_b$ and ${\mathrm{\Sigma }}_b$ baryons

Journal Article · Mon May 12 00:00:00 UTC 2025 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.111.094012 · OSTI ID:2565747

Meng, Lingdi ; Peng, Tian-Cai; Hu, Zhi ; Xu, Siqi ; Lan, Jiangshan ; Mondal, Chandan ; Wang, Guo-Li ; Zhao, Xingbo ; Vary, James P.

Within the basis light-front quantization framework, we compute the masses and light-front wave functions of the ${\mathrm{\Lambda }}_b$ baryon and its isospin triplet counterparts ${\mathrm{\Sigma }}_b^{+}$ , ${\mathrm{\Sigma }}_b^0$ , and ${\mathrm{\Sigma }}_b^{-}$ using a light-front effective Hamiltonian in the leading Fock sector. These wave functions are obtained as eigenstates of the effective Hamiltonian, which incorporates the one-gluon exchange interaction with fixed coupling and a three-dimensional confinement potential. With the quark masses and the couplings as adjustable parameters, the computed masses are set within the experimental range. The resulting predictions for their electromagnetic properties align well with other theoretical calculations. Additionally, the parton distribution functions (PDFs) of these baryons are obtained for the first time, with gluon and sea quark distributions dynamically generated through QCD evolution of the valence quark PDFs. Published by the American Physical Society 2025

• Sponsoring Organization: USDOE
• Grant/Contract Number: SC0023692
• OSTI ID: 2565747
• Journal Information: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 9 Vol. 111; ISSN PRVDAQ; ISSN 2470-0010
• Publisher: American Physical SocietyCopyright Statement
• Country of Publication: United States
• Language: English