A charmed baryon with mass m=2939.8±1.3(stat)±1.0(syst) MeV and width Γ=17.5±5.2(stat)±5.9(syst) MeV is first observed in the D⁰p invariant mass spectrum by the BaBar Collaboration and hence assigned as a Λ_c state, which is confirmed by the Belle Collaboration.

At present, the structure of Λ_c(2940) is still unclear, and the current information of Λ_c(2940) is extracted in the e⁺e^- collision. Hence, researchers in the Theoretical Physics Group at Institute of Modern Physics, Chinese Academy of Sciences (IMP) try to investigate it in other channels, and explore the possibility of the charmed baryon Λ_c(2940) via the proton-antiproton collision in the PANDA detector at FAIR.

With the effectiveLagrangian method, the researchers have predicted that 10⁴~10⁸ events of Λ_c(2940) per day can be produced in PANDA under the designed luminosity of PANDA about L=2*10³²cm^-2/s and assuming 50% overall efficiency. In Fig.1, two explicit decay channels  (left) and  (right) at =5.35 GeV are presented. If the two channels are simultaneously considered, the signals of Λ_c(2940) can be observed with any spin-parity assignment. The results may provide valuable information for accurate determination of the Λ_c(2940) identity in PANDA detector.

The results have been published in Physics Review D 84, 114010 (2011).
http://prd.aps.org/abstract/PRD/v84/i11/e114010

Fig.1 The cross sections of Λ_c(2940) production.(Image by IMP)