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In this paper, we present the measurement of the charge symmetry breaking in A = 4 hypernuclei in Au+Au collisions at √ S   NN   = 3 GeV. The signal reconstruction and binding energy measurement of  Λ  4 H and  Λ  4 He, including corrections and systematic uncertainty evaluation, are discussed. Combined with the energy levels of excited states, our preliminary result of Λ binding energy difference for excited states is ΔB Λ (1 + ) = −190±130(stat.)±70(syst.) keV which shows a negative value and its magnitude is comparable to the result of ground states ΔB Λ (0 + ) = 130 ± 130(stat.) ± 70(syst.) keV. These results are compared with previous measurements and theoretical model calculations.

Study of Charge Symmetry Breaking in A = 4 hypernuclei in √SNN = 3 GeV Au+Au collisions at RHIC