Measurement of kaon directed flow in Au+Au collisions in the high baryon density region

Physics Letters B 2026 Open access

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Authors: B.E. Aboona, J. Adam, G. Agakishiev, I. Aggarwal, M.M. Aggarwal, Z. Ahammed, A. Aitbayev, I. Alekseev, E. Alpatov, A.K. Alshammri, A. Aparin, S. Aslam
+88 more J. Atchison, G.S. Averichev, V. Bairathi, X. Bao, P. Barik, K. Barish, S. Behera, P. Bhagat, A. Bhasin, S. Bhatta, I.G. Bordyuzhin, J.D. Brandenburg, A.V. Brandin, C. Broodo, X.Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, J. Ceska, I. Chakaberia, Y.S. Chang, Z. Chang, A. Chatterjee, D. Chen, J.H. Chen, L. Chen, Q. Chen, W. Chen, Z. Chen, J. Cheng, Y. Cheng, W. Christie, X. Chu, S. Corey, H.J. Crawford, G. Dale-Gau, A. Das, D. De Souza Lemos, T.G. Dedovich, I.M. Deppner, A.A. Derevschikov, A. Deshpande, A. Dhamija, A. Dimri, P. Dixit, X. Dong, J.L. Drachenberg, E. Duckworth, J.C. Dunlop, Y.S. El-Feky, J. Engelage, G. Eppley, S. Esumi, O. Evdokimov, O. Eyser, B. Fan, Y. Fang, R. Fatemi, S. Fazio, H. Feng, Y. Feng, E. Finch, Y. Fisyak, F.A. Flor, B. Fu, C. Fu, T. Fu, T. Gao, Y. Gao, G. Garcia, F. Geurts, A. Gibson, A. Giri, K. Gopal, X. Gou, D. Grosnick, A. Gu, J. Gu, A. Gupta, A. Hamed, R.J. Hamilton, J. Han, X. Han, M.D. Harasty, J.W. Harris, H. Harrison-Smith, L.B. Havener, X.H. He
DOI: 10.1016/j.physletb.2026.140353
Cited by: 2
References: 65

Abstract

Rapidity-odd directed flow $v_1$ measurements are presented for $K^{\pm}$ and $K^0_S$ in Au$+$Au collisions at $\sqrt{s_{\text{NN}}}$ = 3.0, 3.2, 3.5, and 3.9 GeV with the STAR experiment. For comparison, $v_1$ of $π^{\pm}$, protons, and $Λ$ from the same collisions are also discussed. The mid-rapidity $v_1$ slope $\text{d}v_1/\text{d}y|_{y=0}$ for protons and $Λ$ is positive in these collisions. On the other hand, $v_1$ slope of kaons exhibits a strong $p_\text{T}$ dependence: negative at $p_\text{T}

Fields of Study & Subjects

High-Energy Particle Collisions Research Dust and Plasma Wave Phenomena Particle physics theoretical and experimental studies

Publication details

Journal / source
Physics Letters B
Publisher
Elsevier BV
Volume
875
Pages
140353–140353
Publication date
22 March 2026
Language
EN