Study of charge symmetry breaking in A = 4 hypernuclei in √sNN = 3 GeV Au+Au collisions at RHIC

In these proceedings, we present the measurement of the charge symmetry breaking in A = 4 hypernuclei in Au+Au collisions at √sNN = 3 GeV. The signal reconstruction and binding energy measurements of 4ΛH and 4ΛHe, including corrections on momentum, are discussed. Our result of Λ binding energy difference for ground states is ΔBΛ(0+) = 0.16 ± 0.14(stat.) ± 0.10(syst.) MeV. Combined with the energy levels of excited states, the difference for excited states is ΔBΛ(1+) = −0.16 ± 0.14(stat.) ± 0.10(syst.) MeV which shows a negative sign with a magnitude comparable to the result of ground states. These results are compared with previous measurements and theoretical model calculations.