Measurement of $^{4}_{Λ}$H and $^{4}_{Λ}$He binding energy in Au+Au collisions at $\sqrt{s_{NN}}$ = 3 GeV

• Published in: Physics letters. B 2022-09, Vol.834
• Main Authors: Adam, J., Adams, J. R., Adkins, J. K., Ashraf, M. U., Baker, W., Behera, A., Bhagat, P., Bielcikova, J., Calderón de la Barca Sánchez, M., Chatterjee, A., Chattopadhyay, S., Chen, D., Chen, X., Crawford, H. J., Daugherity, M., Di Carlo, L., Eppley, G., Evdokimov, O., Fazio, S., Galatyuk, T., Geurts, F., Ghimire, N., Gupta, A., Guryn, W., Han, Y., He, W., Herrmann, N., Holub, L., Huang, H. Z., Huang, S. L., Huang, T., Jacobs, W. W., Jin, C., Ju, X., Kang, K., Keane, D., Khyzhniak, Y. V., Knospe, A. G., Ko, H. S., Landgraf, J. M., Lebedev, A., Li, Z., Liang, X., Lin, T., Liu, X., Lukow, N. S., Ma, Y. G., Mallick, D., Margetis, S., Mazer, J. A., Mioduszewski, S., Mohanty, B., Mondal, M. M., Nain, A. S., Nam, J. D., Nasim, Md, Nayak, K., Neff, D., Nonaka, T., Nunes, A. S., Odyniec, G., Oh, S., Pak, R., Pandey, A. K., Pawlik, B., Posik, M., Pruthi, N. K., Quintero, A., Racz, C., Radhakrishnan, S. K., Reed, R., Ruan, L., Schmidke, W. B., Seck, F-J, Shanmuganathan, P. V., Shao, M., Sharma, R., Sheikh, A. I., Singh, J., Solyst, W., Song, Y., Srivastava, B., Stefaniak, M., Stringfellow, B., Tarnowsky, T., Tlusty, D., Trentalange, S., Truhlar, T., Wang, G., Wang, J. S., Wang, X., Wang, Z., Witt, R., Wu, J., Xu, Q. H., Yang, Y., Zhang, C., Zhang, J., Zhang, Z., Zhou, C.
• Format: Article
• Language: English
• Subjects: NUCLEAR PHYSICS AND RADIATION PHYSICS
• ISSN: 0370-2693

Measurements of mass and Λ binding energy of $^{4}_{Λ}$H and $^{4}_{Λ}$He in Au+Au collisions at $\sqrt{s_{NN}}$ = 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 $^{4}_{Λ}$H and $^{4}_{Λ}$He, 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 ΔB$^{4}_{Λ}$($1^{+}_{exc}$) ≈ –ΔB$^{4}_{Λ}$($0^{+}_{g.s.}$) < 0 and present a new method for the study of CSB effect using relativistic heavy-ion collisions.