Abstract
We study the electromagnetic form factors of the doubly charmed baryons, using covariant chiral perturbation theory within the extended on-mass-shell (EOMS) scheme. Vector-meson contributions are also taken into account. We present results for the baryon magnetic moments, charge and magnetic radii. While some of the chiral Lagrangian parameters could be set to values determined in previous works, the available lattice results for $\Xi_{cc}^+$ and $\Omega_{cc}^+$ only allow for robust constraints on the low-energy constant (LEC) combination, $c_{89}(=-\frac{1}{3}c_8+4c_9)$. The couplings of the doubly charmed baryons to the vector mesons have been estimated assuming the Okubo--Zweig--Iizuka (OZI) rule. We also give the expressions for the form factors of the double beauty baryons considering the masses predicted in the framework of quark models. A comparison of our results with those obtained in heavy baryon chiral perturbation theory (HBChPT) at the same chiral order is made.
Highlights
The recent announcement of the observation of the Ξþccþ particle by the LHCb Collaboration [1] has revived interest on the physics of doubly heavy baryons
There, the magnetic moments and electromagnetic form factors of Ωþcc and Ξþcc at different values of Q2 were obtained for different lattice configurations and different meson and baryon masses
For the kaon and the η meson masses, not explicit in Refs. [33,34,35], we use the Gell-Mann, Oakes, and Renner relations [43,96], taking into account that the strange quark mass is fixed to its physical value
Summary
The recent announcement of the observation of the Ξþccþ particle by the LHCb Collaboration [1] has revived interest on the physics of doubly heavy baryons. The corresponding power counting involves some difficulties when baryon loops are included in the calculation, and different methods have been developed to overcome this issue such as HBChPT [51], heavy hadron (HH) ChPT, using similar techniques [52,53], and the covariant approaches: infrared [54] and EOMS [55] All these schemes have been widely and successfully used to investigate the electromagnetic structure of light baryons [46,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
