학술논문
Measurement of H Λ 4 and He Λ 4 binding energy in Au+Au collisions at s NN = 3 GeV
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article
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Collaboration, STAR; Abdallah, MS; Aboona, BE; Adam, J; Adamczyk, L; Adams, JR; Adkins, JK; Aggarwal, I; Aggarwal, MM; Ahammed, Z; Anderson, DM; Aschenauer, EC; Ashraf, MU; Atchison, J; Bairathi, V; Baker, W; Cap, JG Ball; Barish, K; Behera, A; Bellwied, R; Bhagat, P; Bhasin, A; Bielcik, J; Bielcikova, J; Brandenburg, JD; Cai, XZ; Caines, H; de la Barca Sánchez, M Calderón; Cebra, D; Chakaberia, I; Chaloupka, P; Chan, BK; Chang, Z; Chatterjee, A; Chattopadhyay, S; Chen, D; Chen, J; Chen, JH; Chen, X; Chen, Z; Cheng, J; Choudhury, S; Christie, W; Chu, X; Crawford, HJ; Csanád, M; Daugherity, M; Deppner, IM; Dhamija, A; Di Carlo, L; Didenko, L; Dixit, P; Dong, X; Drachenberg, JL; Duckworth, E; Dunlop, JC; Engelage, J; Eppley, G; Esumi, S; Evdokimov, O; Ewigleben, A; Eyser, O; Fatemi, R; Fawzi, FM; Fazio, S; Feng, CJ; Feng, Y; Finch, E; Fisyak, Y; Francisco, A; Fu, C; Gagliardi, CA; Galatyuk, T; Geurts, F; Ghimire, N; Gibson, A; Gopal, K; Gou, X; Grosnick, D; Gupta, A; Guryn, W; Hamed, A; Han, Y; Harabasz, S; Harasty, MD; Harris, JW; Harrison, H; He, S; He, W; He, XH; He, Y; Heppelmann, S; Herrmann, N; Hoffman, E; Holub, L; Hu, C; Hu, Q; Hu, Y; Huang, H; Huang, HZ
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Abstract
Measurements of mass and Λ binding energy of Λ4H and Λ4He in Au+Au collisions at sNN=3 GeV are presented, with an aim to address the charge symmetry breaking (CSB) problem in hypernuclei systems with atomic number A = 4. The Λ binding energies are measured to be 2.22±0.06(stat.)±0.14(syst.) MeV and 2.38±0.13(stat.)±0.12(syst.) MeV for Λ4H and Λ4He, respectively. The measured Λ binding-energy difference is 0.16±0.14(stat.)±0.10(syst.) MeV for ground states. Combined with the γ-ray transition energies, the binding-energy difference for excited states is −0.16±0.14(stat.)±0.10(syst.) MeV, which is negative and comparable to the value of the ground states within uncertainties. These new measurements on the Λ binding-energy difference in A = 4 hypernuclei systems are consistent with the theoretical calculations that result in ΔBΛ4(1exc+)≈−ΔBΛ4(0g.s.+)