Probing Parton Dynamics of QCD Matter with $Ω$ and $ϕ$ Production
Creators: name: STAR Collaboration
name: Adamczyk, L.
name: Adkins, J. K.
name: Agakishiev, G.
name: Aggarwal, M. M.
name: Ahammed, Z.
name: Alekseev, I.
name: Alford, J.
name: Aparin, A.
name: Arkhipkin, D.
name: Aschenauer, E. C.
name: Averichev, G. S.
name: Bairathi, V.
name: Banerjee, A.
name: Bellwied, R.
name: Bhasin, A.
name: Bhati, A. K.
name: Bhattarai, P.
name: Bielcik, J.
name: Bielcikova, J.
name: Bland, L. C.
name: Bordyuzhin, I. G.
name: Bouchet, J.
name: Brandin, A. V.
name: Bunzarov, I.
name: Butterworth, J.
name: Caines, H.
name: Sánchez, M. Calderón de la Barca
name: Campbell, J. M.
name: Cebra, D.
name: Cervantes, M. C.
name: Chakaberia, I.
name: Chaloupka, P.
name: Chang, Z.
name: Chattopadhyay, S.
name: Chen, J. H.
name: Chen, X.
name: Cheng, J.
name: Cherney, M.
name: Christie, W.
name: Contin, G.
name: Crawford, H. J.
name: Das, S.
name: De Silva, L. C.
name: Debbe, R. R.
name: Dedovich, T. G.
name: Deng, J.
name: Derevschikov, A. A.
name: di Ruzza, B.
name: Didenko, L.
name: Dilks, C.
name: Dong, X.
name: Drachenberg, J. L.
name: Draper, J. E.
name: Du, C. M.
name: Dunkelberger, L. E.
name: Dunlop, J. C.
name: Efimov, L. G.
name: Engelage, J.
name: Eppley, G.
name: Esha, R.
name: Evdokimov, O.
name: Eyser, O.
name: Fatemi, R.
name: Fazio, S.
name: Federic, P.
name: Fedorisin, J.
name: Feng, Z.
name: Filip, P.
name: Fisyak, Y.
name: Flores, C. E.
name: Fulek, L.
name: Gagliardi, C. A.
name: Garand, D.
name: Geurts, F.
name: Gibson, A.
name: Girard, M.
name: Greiner, L.
name: Grosnick, D.
name: Gunarathne, D. S.
name: Guo, Y.
name: Gupta, A.
name: Gupta, S.
name: Guryn, W.
name: Hamad, A.
name: Hamed, A.
name: Haque, R.
name: Harris, J. W.
name: He, L.
name: Heppelmann, S.
name: Heppelmann, S.
name: Hirsch, A.
name: Hoffmann, G. W.
name: Hofman, D. J.
name: Horvat, S.
name: Huang, B.
name: Huang, H. Z.
name: Huang, X.
name: Huck, P.
name: Humanic, T. J.
name: Igo, G.
name: Jacobs, W. W.
name: Jang, H.
name: Jiang, K.
name: Judd, E. G.
name: Kabana, S.
name: Kalinkin, D.
name: Kang, K.
name: Kauder, K.
name: Ke, H. W.
name: Keane, D.
name: Kechechyan, A.
name: Khan, Z. H.
name: Kikoła, D. P.
name: Kisel, I.
name: Kisiel, A.
name: Kochenda, L.
name: Koetke, D. D.
name: Kollegger, T.
name: Kosarzewski, L. K.
name: Kraishan, A. F.
name: Kravtsov, P.
name: Krueger, K.
name: Kulakov, I.
name: Kumar, L.
name: Kycia, R. A.
name: Lamont, M. A. C.
name: Landgraf, J. M.
name: Landry, K. D.
name: Lauret, J.
name: Lebedev, A.
name: Lednicky, R.
name: Lee, J. H.
name: Li, X.
name: Li, Z. M.
name: Li, Y.
name: Li, W.
name: Li, X.
name: Li, C.
name: Lisa, M. A.
name: Liu, F.
name: Ljubicic, T.
name: Llope, W. J.
name: Lomnitz, M.
name: Longacre, R. S.
name: Luo, X.
name: Ma, G. L.
name: Ma, R.
name: Ma, Y. G.
name: Ma, L.
name: Magdy, N.
name: Majka, R.
name: Manion, A.
name: Margetis, S.
name: Markert, C.
name: Masui, H.
name: Matis, H. S.
name: McDonald, D.
name: Meehan, K.
name: Minaev, N. G.
name: Mioduszewski, S.
name: Mishra, D.
name: Mohanty, B.
name: Mondal, M. M.
name: Morozov, D. A.
name: Mustafa, M. K.
name: Nandi, B. K.
name: Nasim, Md.
name: Nayak, T. K.
name: Nigmatkulov, G.
name: Nogach, L. V.
name: Noh, S. Y.
name: Novak, J.
name: Nurushev, S. B.
name: Odyniec, G.
name: Ogawa, A.
name: Oh, K.
name: Okorokov, V.
name: Olvitt, D.
name: Page, B. S.
name: Pak, R.
name: Pan, Y. X.
name: Pandit, Y.
name: Panebratsev, Y.
name: Pawlik, B.
name: Pei, H.
name: Perkins, C.
name: Peterson, A.
name: Pile, P.
name: Planinic, M.
name: Pluta, J.
name: Poljak, N.
name: Poniatowska, K.
name: Porter, J.
name: Posik, M.
name: Poskanzer, A. M.
name: Putschke, J.
name: Qiu, H.
name: Quintero, A.
name: Ramachandran, S.
name: Raniwala, R.
name: Raniwala, S.
name: Ray, R. L.
name: Ritter, H. G.
name: Roberts, J. B.
name: Rogachevskiy, O. V.
name: Romero, J. L.
name: Roy, A.
name: Ruan, L.
name: Rusnak, J.
name: Rusnakova, O.
name: Sahoo, N. R.
name: Sahu, P. K.
name: Sakrejda, I.
name: Salur, S.
name: Sandweiss, J.
name: Sarkar, A.
name: Schambach, J.
name: Scharenberg, R. P.
name: Schmah, A. M.
name: Schmidke, W. B.
name: Schmitz, N.
name: Seger, J.
name: Seyboth, P.
name: Shah, N.
name: Shahaliev, E.
name: Shanmuganathan, P. V.
name: Shao, M.
name: Sharma, M. K.
name: Sharma, B.
name: Shen, W. Q.
name: Shi, S. S.
name: Shou, Q. Y.
name: Sichtermann, E. P.
name: Sikora, R.
name: Simko, M.
name: Skoby, M. J.
name: Smirnov, N.
name: Smirnov, D.
name: Song, L.
name: Sorensen, P.
name: Spinka, H. M.
name: Srivastava, B.
name: Stanislaus, T. D. S.
name: Stepanov, M.
name: Stock, R.
name: Strikhanov, M.
name: Stringfellow, B.
name: Sumbera, M.
name: Summa, B.
name: Sun, Z.
name: Sun, X. M.
name: Sun, Y.
name: Sun, X.
name: Surrow, B.
name: Svirida, N.
name: Szelezniak, M. A.
name: Tang, Z.
name: Tang, A. H.
name: Tarnowsky, T.
name: Tawfik, A.
name: Thomas, J. H.
name: Timmins, A. R.
name: Tlusty, D.
name: Tokarev, M.
name: Trentalange, S.
name: Tribble, R. E.
name: Tribedy, P.
name: Tripathy, S. K.
name: Trzeciak, B. A.
name: Tsai, O. D.
name: Ullrich, T.
name: Underwood, D. G.
name: Upsal, I.
name: Van Buren, G.
name: van Nieuwenhuizen, G.
name: Vandenbroucke, M.
name: Varma, R.
name: Vasiliev, A. N.
name: Vertesi, R.
name: Videbæk, F.
name: Viyogi, Y. P.
name: Vokal, S.
name: Voloshin, S. A.
name: Vossen, A.
name: Wang, G.
name: Wang, H.
name: Wang, J. S.
name: Wang, Y.
name: Wang, Y.
name: Wang, F.
name: Webb, J. C.
name: Webb, G.
name: Wen, L.
name: Westfall, G. D.
name: Wieman, H.
name: Wissink, S. W.
name: Witt, R.
name: Wu, Y. F.
name: Xiao, Z. G.
name: Xie, W.
name: Xin, K.
name: Xu, Y. F.
name: Xu, Q. H.
name: Xu, H.
name: Xu, N.
name: Xu, Z.
name: Yang, Y.
name: Yang, C.
name: Yang, S.
name: Yang, Y.
name: Yang, Q.
name: Ye, Z.
name: Yepes, P.
name: Yi, L.
name: Yip, K.
name: Yoo, I. -K.
name: Yu, N.
name: Zbroszczyk, H.
name: Zha, W.
name: Zhang, J. B.
name: Zhang, Z.
name: Zhang, J.
name: Zhang, S.
name: Zhang, X. P.
name: Zhang, J.
name: Zhang, Y.
name: Zhao, F.
name: Zhao, J.
name: Zhong, C.
name: Zhou, L.
name: Zhu, X.
name: Zoulkarneeva, Y.
name: Zyzak, M.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present measurements of $Ω$ and $ϕ$ production at mid-rapidity from Au+Au collisions at nucleon-nucleon center-of-mass energies $\sqrt{s_{NN}}$ = 7.7, 11.5, 19.6, 27 and 39 GeV by the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). Motivated by the coalescence formation mechanism for these strange hadrons, we study the ratios of $N(Ω^{-}+Ω^{+})/(2N(ϕ))$. These ratios as a function of transverse momentum ($p_T$) fall on a consistent trend at high collision energies, but start to show deviations in peripheral collisions at $\sqrt{s_{NN}}$ = 19.6, 27 and 39 GeV, and in central collisions at 11.5 GeV in the intermediate $p_T$ region of 2.4-3.6 GeV/c. We further evaluate empirically the strange quark $p_T$ distributions at hadronization by studying the $Ω/ϕ$ ratios scaled by the number of constituent quarks. The NCQ-scaled $Ω/ϕ$ ratios show a suppression of strange quark production in central collisions at 11.5 GeV compared to $\sqrt{s_{NN}} &gt;= 19.6$ GeV. The shapes of the presumably thermal strange quark distributions in 0-60% most central collisions at 7.7 GeV show significant deviations from those in 0-10% most central collisions at higher energies. These features suggest that there is likely a change of the underlying strange quark dynamics in the transition from quark-matter to hadronic matter at collision energies below 19.6 GeV.
description: 7 pages, 5 figures