Estimate of Background Baseline and Upper Limit on the Chiral Magnetic Effect in Isobar Collisions at $\sqrt{s_{\text{NN}}}=200$ GeV at the Relativistic Heavy-Ion Collider
Creators: name: STAR Collaboration
name: Abdulhamid, M. I.
name: Aboona, B. E.
name: Adam, J.
name: Adams, J. R.
name: Agakishiev, G.
name: Aggarwal, I.
name: Aggarwal, M. M.
name: Ahammed, Z.
name: Aitbaev, A.
name: Alekseev, I.
name: Alpatov, E.
name: Aparin, A.
name: Aslam, S.
name: Atchison, J.
name: Averichev, G. S.
name: Bairathi, V.
name: Cap, J. G. Ball
name: Barish, K.
name: Bhagat, P.
name: Bhasin, A.
name: Bhatta, S.
name: Bhosale, S. R.
name: Bordyuzhin, I. G.
name: Brandenburg, J. D.
name: Brandin, A. V.
name: Broodo, C.
name: Cai, X. Z.
name: Caines, H.
name: Calderón~de~la~Barca~Sánchez, M.
name: Cebra, D.
name: Ceska, J.
name: Chakaberia, I.
name: Chan, B. K.
name: Chang, Z.
name: Chatterjee, A.
name: Chen, D.
name: Chen, J.
name: Chen, J. H.
name: Chen, Z.
name: Cheng, J.
name: Cheng, Y.
name: Choudhury, S.
name: Christie, W.
name: Chu, X.
name: Crawford, H. J.
name: Dale-Gau, G.
name: Das, A.
name: Dedovich, T. G.
name: Deppner, I. M.
name: Derevschikov, A. A.
name: Dhamija, A.
name: Dixit, P.
name: Dong, X.
name: Drachenberg, J. L.
name: Duckworth, E.
name: Dunlop, J. C.
name: Engelage, J.
name: Eppley, G.
name: Esumi, S.
name: Evdokimov, O.
name: Eyser, O.
name: Fatemi, R.
name: Fazio, S.
name: Feng, C. J.
name: Feng, Y.
name: Finch, E.
name: Fisyak, Y.
name: Flor, F. A.
name: Fu, C.
name: Gao, T.
name: Geurts, F.
name: Ghimire, N.
name: Gibson, A.
name: Gopal, K.
name: Gou, X.
name: Grosnick, D.
name: Gupta, A.
name: Hamed, A.
name: Han, Y.
name: Harasty, M. D.
name: Harris, J. W.
name: Harrison-Smith, H.
name: He, W.
name: He, X. H.
name: He, Y.
name: Hu, C.
name: Hu, Q.
name: Hu, Y.
name: Huang, H.
name: Huang, H. Z.
name: Huang, S. L.
name: Huang, T.
name: Huang, X.
name: Huang, Y.
name: Huang, Y.
name: Humanic, T. J.
name: Isshiki, M.
name: Jacobs, W. W.
name: Jalotra, A.
name: Jena, C.
name: Ji, Y.
name: Jia, J.
name: Jin, C.
name: Ju, X.
name: Judd, E. G.
name: Kabana, S.
name: Kalinkin, D.
name: Kang, K.
name: Kapukchyan, D.
name: Kauder, K.
name: Keane, D.
name: Kechechyan, A.
name: Khanal, A.
name: Kiselev, A.
name: Knospe, A. G.
name: Ko, H. S.
name: Kochenda, L.
name: Korobitsin, A. A.
name: Kraeva, A. Yu.
name: Kravtsov, P.
name: Kumar, L.
name: Labonte, M. C.
name: Lacey, R.
name: Landgraf, J. M.
name: Lebedev, A.
name: Lednicky, R.
name: Lee, J. H.
name: Leung, Y. H.
name: Lewis, N.
name: Li, C.
name: Li, D.
name: Li, H-S.
name: Li, H.
name: Li, W.
name: Li, X.
name: Li, Y.
name: Li, Y.
name: Li, Z.
name: Liang, X.
name: Liang, Y.
name: Lin, T.
name: Lin, Y.
name: Liu, C.
name: Liu, G.
name: Liu, H.
name: Liu, L.
name: Liu, T.
name: Liu, X.
name: Liu, Y.
name: Liu, Z.
name: Ljubicic, T.
name: Lomicky, O.
name: Longacre, R. S.
name: Loyd, E. M.
name: Lu, T.
name: Luo, J.
name: Luo, X. F.
name: Luong, V. B.
name: Ma, L.
name: Ma, R.
name: Ma, Y. G.
name: Magdy, N.
name: Manikandhan, R.
name: Margetis, S.
name: Matis, H. S.
name: McNamara, G.
name: Mezhanska, O.
name: Mi, K.
name: Minaev, N. G.
name: Mohanty, B.
name: Mondal, M. M.
name: Mooney, I.
name: Morozov, D. A.
name: Mudrokh, A.
name: Nagy, M. I.
name: Nain, A. S.
name: Nam, J. D.
name: Nasim, M.
name: Nedorezov, E.
name: Neff, D.
name: Nelson, J. M.
name: Nemes, D. B.
name: Nie, M.
name: Nigmatkulov, G.
name: Niida, T.
name: Nogach, L. V.
name: Nonaka, T.
name: Odyniec, G.
name: Ogawa, A.
name: Oh, S.
name: Okorokov, V. A.
name: Okubo, K.
name: Page, B. S.
name: Pak, R.
name: Pal, S.
name: Pandav, A.
name: Pandey, A. K.
name: Panebratsev, Y.
name: Pani, T.
name: Parfenov, P.
name: Paul, A.
name: Perkins, C.
name: Pokhrel, B. R.
name: Posik, M.
name: Povarov, A.
name: Protzman, T.
name: Pruthi, N. K.
name: Putschke, J.
name: Qin, Z.
name: Qiu, H.
name: Racz, C.
name: Radhakrishnan, S. K.
name: Rana, A.
name: Ray, R. L.
name: Ritter, H. G.
name: Robertson, C. W.
name: Rogachevsky, O. V.
name: Aguilar, M. A. Rosales
name: Roy, D.
name: Ruan, L.
name: Sahoo, A. K.
name: Sahoo, N. R.
name: Sako, H.
name: Salur, S.
name: Samigullin, E.
name: Sato, S.
name: Schaefer, B. C.
name: Schmidke, W. B.
name: Schmitz, N.
name: Seger, J.
name: Seto, R.
name: Seyboth, P.
name: Shah, N.
name: Shahaliev, E.
name: Shanmuganathan, P. V.
name: Shao, T.
name: Sharma, M.
name: Sharma, N.
name: Sharma, R.
name: Sharma, S. R.
name: Sheikh, A. I.
name: Shen, D.
name: Shen, D. Y.
name: Shen, K.
name: Shi, S. S.
name: Shi, Y.
name: Shou, Q. Y.
name: Si, F.
name: Singh, J.
name: Singha, S.
name: Sinha, P.
name: Skoby, M. J.
name: Söhngen, Y.
name: Song, Y.
name: Srivastava, B.
name: Stanislaus, T. D. S.
name: Stewart, D. J.
name: Strikhanov, M.
name: Stringfellow, B.
name: Su, Y.
name: Sun, C.
name: Sun, X.
name: Sun, Y.
name: Sun, Y.
name: Surrow, B.
name: Svirida, D. N.
name: Sweger, Z. W.
name: Tamis, A. C.
name: Tang, A. H.
name: Tang, Z.
name: Taranenko, A.
name: Tarnowsky, T.
name: Thomas, J. H.
name: Tlusty, D.
name: Todoroki, T.
name: Tokarev, M. V.
name: Trentalange, S.
name: Tribedy, P.
name: Tsai, O. D.
name: Tsang, C. Y.
name: Tu, Z.
name: Tyler, J.
name: Ullrich, T.
name: Underwood, D. G.
name: Upsal, I.
name: Van Buren, G.
name: Vasiliev, A. N.
name: Verkest, V.
name: Videbæk, F.
name: Vokal, S.
name: Voloshin, S. A.
name: Wang, F.
name: Wang, G.
name: Wang, J. S.
name: Wang, J.
name: Wang, K.
name: Wang, X.
name: Wang, Y.
name: Wang, Y.
name: Wang, Y.
name: Wang, Z.
name: Webb, J. C.
name: Weidenkaff, P. C.
name: Westfall, G. D.
name: Wieman, H.
name: Wilks, G.
name: Wissink, S. W.
name: Wu, J.
name: Wu, J.
name: Wu, X.
name: X
name: Wu
name: Xi, B.
name: Xiao, Z. G.
name: Xie, G.
name: Xie, W.
name: Xu, H.
name: Xu, N.
name: Xu, Q. H.
name: Xu, Y.
name: Xu, Y.
name: Xu, Z.
name: Xu, Z.
name: Yan, G.
name: Yan, Z.
name: Yang, C.
name: Yang, Q.
name: Yang, S.
name: Yang, Y.
name: Ye, Z.
name: Ye, Z.
name: Yi, L.
name: Yip, K.
name: Yu, Y.
name: Zha, W.
name: Zhang, C.
name: Zhang, D.
name: Zhang, J.
name: Zhang, S.
name: Zhang, W.
name: Zhang, X.
name: Zhang, Y.
name: Zhang, Y.
name: Zhang, Y.
name: Zhang, Y.
name: Zhang, Z. J.
name: Zhang, Z.
name: Zhang, Z.
name: Zhao, F.
name: Zhao, J.
name: Zhao, M.
name: Zhou, J.
name: Zhou, S.
name: Zhou, Y.
name: Zhu, X.
name: Zurek, M.
name: Zyzak, M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: For the search of the chiral magnetic effect (CME), STAR previously presented the results from isobar collisions (${^{96}_{44}\text{Ru}}+{^{96}_{44}\text{Ru}}$, ${^{96}_{40}\text{Zr}}+{^{96}_{40}\text{Zr}}$) obtained through a blind analysis. The ratio of results in Ru+Ru to Zr+Zr collisions for the CME-sensitive charge-dependent azimuthal correlator ($Δγ$), normalized by elliptic anisotropy ($v_{2}$), was observed to be close to but systematically larger than the inverse multiplicity ratio. The background baseline for the isobar ratio, $Y = \frac{(Δγ/v_{2})^{\text{Ru}}}{(Δγ/v_{2})^{\text{Zr}}}$, is naively expected to be $\frac{(1/N)^{\text{Ru}}}{(1/N)^{\text{Zr}}}$; however, genuine two- and three-particle correlations are expected to alter it. We estimate the contributions to $Y$ from those correlations, utilizing both the isobar data and HIJING simulations. After including those contributions, we arrive at a final background baseline for $Y$, which is consistent with the isobar data. We extract an upper limit for the CME fraction in the $Δγ$ measurement of approximately $10\%$ at a $95\%$ confidence level on in isobar collisions at $\sqrt{s_{\text{NN}}} = 200$ GeV, with an expected $15\%$ difference in their squared magnetic fields.
description: 19 pages, 14 figures