https://doi.org/10.1140/epjc/s10052-018-6213-2
Regular Article - Theoretical Physics
Weak decays of doubly heavy baryons: the 
case
INPAC, Shanghai Key Laboratory for Particle Physics and Cosmology, MOE Key Laboratory for Particle Physics, Astrophysics and Cosmology, School of Physics and Astronomy, Shanghai Jiao-Tong University, Shanghai, 200240, People’s Republic of China
* e-mail: star_0027@sjtu.edu.cn
Received:
6
June
2018
Accepted:
1
September
2018
Published online:
20
September
2018
As a continuation of our previous work, we investigate the weak decays of doubly heavy baryons into a spin-3 / 2 singly or doubly heavy baryon. The light-front approach is adopted to handle the dynamics in the transitions, in which the two spectator quarks are approximated as a diquark. Results for the form factors are then used to calculate decay widths of semileptonic and nonleptonic processes. The flavor SU(3) symmetry and symmetry breaking effects in semileptonic decays modes are explored, and we point out that in the charm sector, there are sizable symmetry breaking effects. For nonleptonic decay modes, we study only the factorizable channels induced by external W-emission. We find that branching fractions for most 1/2 to 3/2 transitions are approximately one order of magnitude smaller than the corresponding ones for the 1/2 to 1/2 transitions. Parametric uncertainties are also investigated in detail. We suggest our experimental colleagues to search for the 1/2 to 1/2 process 
and its 1/2 to 3/2 counterpart 
. Their branching ratios turn out to be around 
and 
. The former branching ratio is expected to be close to that of the recently discovered 
process.
© The Author(s), 2018
