학술논문

Beam Energy Dependence of Triton Production and Yield Ratio ($\mathrm{N}_t \times \mathrm{N}_p/\mathrm{N}_d^2$) in Au+Au Collisions at RHIC
Document Type
Working Paper
Author
STAR CollaborationAbdulhamid, M. I.Aboona, B. E.Adam, J.Adams, J. R.Agakishiev, G.Aggarwal, I.Aggarwal, M. M.Ahammed, Z.Aitbaev, A.Alekseev, I.Anderson, D. M.Aparin, A.Aslam, S.Atchison, J.Averichev, G. S.Bairathi, V.Baker, W.Cap, J. G. BallBarish, K.Bhagat, P.Bhasin, A.Bhatta, S.Bordyuzhin, I. G.Brandenburg, J. D.Brandin, A. V.Cai, X. Z.Caines, H.Calderón~de~la~Barca~Sánchez, M.Cebra, D.Ceska, J.Chakaberia, I.Chan, B. K.Chang, Z.Chatterjee, A.Chen, D.Chen, J.Chen, J. H.Chen, Z.Cheng, J.Cheng, Y.Choudhury, S.Christie, W.Chu, X.Crawford, H. J.Dale-Gau, G.Das, A.Daugherity, M.Dedovich, T. G.Deppner, I. M.Derevschikov, A. A.Dhamija, A.Di Carlo, L.Didenko, L.Dixit, P.Dong, X.Drachenberg, J. L.Duckworth, E.Dunlop, J. C.Engelage, J.Eppley, G.Esumi, S.Evdokimov, O.Ewigleben, A.Eyser, O.Fatemi, R.Fazio, S.Feng, C. J.Feng, Y.Finch, E.Fisyak, Y.Flor, F. A.Fu, C.Geurts, F.Ghimire, N.Gibson, A.Gopal, K.Gou, X.Grosnick, D.Gupta, A.Hamed, A.Han, Y.Harasty, M. D.Harris, J. W.Harrison-Smith, H.He, W.He, X. H.He, Y.Hu, C.Hu, Q.Hu, Y.Huang, H.Huang, H. Z.Huang, S. L.Huang, T.Huang, X.Huang, Y.Humanic, T. J.Isenhower, D.Isshiki, M.Jacobs, W. W.Jalotra, A.Jena, C.Ji, Y.Jia, J.Jin, C.Ju, X.Judd, E. G.Kabana, S.Kabir, M. L.Kalinkin, D.Kang, K.Kapukchyan, D.Kauder, K.Ke, H. W.Keane, D.Kechechyan, A.Kelsey, M.Kimelman, B.Kiselev, A.Knospe, A. G.Ko, H. S.Kochenda, L.Korobitsin, A. A.Kravtsov, P.Kumar, L.Kumar, S.Elayavalli, R. KunnawalkamLacey, R.Landgraf, J. M.Lebedev, A.Lednicky, R.Lee, J. H.Leung, Y. H.Lewis, N.Li, C.Li, W.Li, X.Li, Y.Li, Z.Liang, X.Liang, Y.Lin, T.Liu, C.Liu, F.Liu, H.Liu, L.Liu, T.Liu, X.Liu, Y.Liu, Z.Ljubicic, T.Llope, W. J.Lomicky, O.Longacre, R. S.Loyd, E. M.Lu, T.Lukow, N. S.Luo, X. F.Luong, V. B.Ma, L.Ma, R.Ma, Y. G.Magdy, N.Mallick, D.Margetis, S.Matis, H. S.Mazer, J. A.McNamara, G.Mi, K.Minaev, N. G.Mohanty, B.Mondal, M. M.Mooney, I.Morozov, D. A.Mudrokh, A.Nagy, M. I.Nain, A. S.Nam, J. D.Nasim, Md.Neff, D.Nelson, J. M.Nemes, D. B.Nie, M.Nigmatkulov, G.Niida, T.Nishitani, R.Nogach, L. V.Nonaka, T.Odyniec, G.Ogawa, A.Oh, S.Okorokov, V. A.Okubo, K.Page, B. S.Pak, R.Pan, J.Pandav, A.Pandey, A. K.Panebratsev, Y.Pani, T.Parfenov, P.Paul, A.Perkins, C.Pokhrel, B. R.Posik, M.Protzman, T.Pruthi, N. K.Putschke, J.Qin, Z.Qiu, H.Quintero, A.Racz, C.Radhakrishnan, S. K.Raha, N.Ray, R. L.Ritter, H. G.Robertson, C. W.Rogachevsky, O. V.Aguilar, M. A. RosalesRoy, D.Ruan, L.Sahoo, A. K.Sahoo, N. R.Sako, H.Salur, S.Samigullin, E.Sato, S.Schmidke, W. B.Schmitz, N.Seger, J.Seto, R.Seyboth, P.Shah, N.Shahaliev, E.Shanmuganathan, P. V.Shao, T.Sharma, M.Sharma, N.Sharma, R.Sharma, S. R.Sheikh, A. I.Shen, D. Y.Shen, K.Shi, S. S.Shi, Y.Shou, Q. Y.Si, F.Singh, J.Singha, S.Sinha, P.Skoby, M. J.Söhngen, Y.Song, Y.Srivastava, B.Stanislaus, T. D. S.Stewart, D. J.Strikhanov, M.Stringfellow, B.Su, Y.Sun, C.Sun, X.Sun, Y.Surrow, B.Svirida, D. N.Sweger, Z. W.Tamis, A.Tang, A. H.Tang, Z.Taranenko, A.Tarnowsky, T.Thomas, J. H.Tlusty, D.Todoroki, T.Tokarev, M. V.Tomkiel, C. A.Trentalange, S.Tribble, R. E.Tribedy, P.Tsai, O. D.Tsang, C. Y.Tu, Z.Ullrich, T.Underwood, D. G.Upsal, I.Van Buren, G.Vasiliev, A. N.Verkest, V.Videbæk, F.Vokal, S.Voloshin, S. A.Wang, F.Wang, G.Wang, J. S.Wang, X.Wang, Y.Wang, Z.Webb, J. C.Weidenkaff, P. C.Westfall, G. D.Wieman, H.Wilks, G.Wissink, S. W.Wu, J.Wu, X.Wu, Y.Xi, B.Xiao, Z. G.Xie, G.Xie, W.Xu, H.Xu, N.Xu, Q. H.Xu, Y.Xu, Z.Yan, G.Yan, Z.Yang, C.Yang, Q.Yang, S.Yang, Y.Ye, Z.Yi, L.Yip, K.Yu, N.Yu, Y.Zha, W.Zhang, C.Zhang, D.Zhang, J.Zhang, S.Zhang, X.Zhang, Y.Zhang, Z. J.Zhang, Z.Zhao, F.Zhao, J.Zhao, M.Zhou, C.Zhou, J.Zhou, S.Zhou, Y.Zhu, X.Zurek, M.Zyzak, M.
Source
Phys. Rev. Lett. 130, 202301 (2023)
Subject
Nuclear Experiment
High Energy Physics - Experiment
High Energy Physics - Phenomenology
High Energy Physics - Theory
Nuclear Theory
Language
Abstract
We report the triton ($t$) production in mid-rapidity ($|y| <$ 0.5) Au+Au collisions at $\sqrt{s_\mathrm{NN}}$= 7.7--200 GeV measured by the STAR experiment from the first phase of the beam energy scan at the Relativistic Heavy Ion Collider (RHIC). The nuclear compound yield ratio ($\mathrm{N}_t \times \mathrm{N}_p/\mathrm{N}_d^2$), which is predicted to be sensitive to the fluctuation of local neutron density, is observed to decrease monotonically with increasing charged-particle multiplicity ($dN_{ch}/d\eta$) and follows a scaling behavior. The $dN_{ch}/d\eta$ dependence of the yield ratio is compared to calculations from coalescence and thermal models. Enhancements in the yield ratios relative to the coalescence baseline are observed in the 0\%-10\% most central collisions at 19.6 and 27 GeV, with a significance of 2.3$\sigma$ and 3.4$\sigma$, respectively, giving a combined significance of 4.1$\sigma$. The enhancements are not observed in peripheral collisions or model calculations without critical fluctuation, and decreases with a smaller $p_{T}$ acceptance. The physics implications of these results on the QCD phase structure and the production mechanism of light nuclei in heavy-ion collisions are discussed.
Comment: 6 pages, 4 figures, Supplemental Material: http://link.aps.org/supplemental/10.1103/PhysRevLett.130.202301