Year: 2026
Type: article
Abstract: U -spin symmetry, which reflects the symmetry between the down-type d and s quarks, is a powerful tool for analyzing heavy hadron weak decays. Motivated by recent experimental achievements in the bottom baryon sector, we study the U -spin sum rules for bottom baryon decays. The effective Hamiltonian for b quark decay is zero under the U -spin lowering operators $$U_-^n$$ U - n , permitting us to derive U -spin sum rules involving only the $$b\rightarrow d$$ b → d transition or $$b\rightarrow s$$ b → s transition. Moreover, a new operator, $$S_b=U_++rU_3-r^2U_-$$ S b = U + + r U 3 - r 2 U - , is proposed to generate U -spin sum rules involving both the $$b\rightarrow d$$ b → d and $$b\rightarrow s$$ b → s transitions. The proof that the effective Hamiltonian for b quark decay is zero under $$U_-^n$$ U - n and $$S_b$$ S b is presented. The master formulas for generating U -spin sum rules for the two-body decays of bottom baryons involving $$b\rightarrow c\overline{c}d/s$$ b → c c ¯ d / s , $$b\rightarrow c\overline{u}d/s$$ b → c u ¯ d / s , $$b\rightarrow u\overline{u}d/s$$ b → u u ¯ d / s , and
Source: The European Physical Journal C
Authors: Si-Jia Wen, Wei-Chen Fu, Di Wang
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Award: G297922379
OpenAlex ID: W7148715597