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    Probing parton dynamics of QCD matter with Ω and φ production

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    Genre
    Journal Article
    Date
    2016-02-24
    Author
    Adamczyk, L
    Adkins, JK
    Agakishiev, G
    Aggarwal, MM
    Ahammed, Z
    Alekseev, I
    Aparin, A
    Arkhipkin, D
    Aschenauer, EC
    Attri, A
    Averichev, GS
    Bai, X
    Bairathi, V
    Bellwied, R
    Bhasin, A
    Bhati, AK
    Bhattarai, P
    Bielcik, J
    Bielcikova, J
    Bland, LC
    Bordyuzhin, IG
    Bouchet, J
    Brandenburg, JD
    Brandin, AV
    Bunzarov, I
    Butterworth, J
    Caines, H
    Calderón De La Barca Sánchez, M
    Campbell, JM
    Cebra, D
    Chakaberia, I
    Chaloupka, P
    Chang, Z
    Chatterjee, A
    Chattopadhyay, S
    Chen, JH
    Chen, X
    Cheng, J
    Cherney, M
    Christie, W
    Contin, G
    Crawford, HJ
    Das, S
    De Silva, LC
    Debbe, RR
    Dedovich, TG
    Deng, J
    Derevschikov, AA
    Di Ruzza, B
    Didenko, L
    Dilks, C
    Dong, X
    Drachenberg, JL
    Draper, JE
    Du, CM
    Dunkelberger, LE
    Dunlop, JC
    Efimov, LG
    Engelage, J
    Eppley, G
    Esha, R
    Evdokimov, O
    Eyser, O
    Fatemi, R
    Fazio, S
    Federic, P
    Fedorisin, J
    Feng, Z
    Filip, P
    Fisyak, Y
    Flores, CE
    Fulek, L
    Gagliardi, CA
    Garand, D
    Geurts, F
    Gibson, A
    Girard, M
    Greiner, L
    Grosnick, D
    Gunarathne, DS
    Guo, Y
    Gupta, S
    Gupta, A
    Guryn, W
    Hamad, AI
    Hamed, A
    Haque, R
    Harris, JW
    He, L
    Heppelmann, S
    Heppelmann, S
    Hirsch, A
    Hoffmann, GW
    Horvat, S
    Huang, T
    Huang, X
    Huang, B
    Huang, HZ
    Huck, P
    Humanic, TJ
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    Subject
    nucl-ex
    nucl-ex
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/5734
    
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    DOI
    10.1103/PhysRevC.93.021903
    Abstract
    © 2016 American Physical Society. We present measurements of Ω and φ production at midrapidity from Au+Au collisions at nucleon-nucleon center-of-mass energies sNN=7.7, 11.5, 19.6, 27, and 39 GeV by the STAR experiment at the BNL Relativistic Heavy Ion Collider (RHIC). Motivated by the coalescence formation mechanism for these strange hadrons, we study the ratios of N(Ω-+Ω#x0002B;)/[2N(φ)]. These ratios as a function of transverse momentum pT fall on a consistent trend at high collision energies, but start to show deviations in peripheral collisions at sNN=19.6, 27, and 39 GeV, and in central collisions at 11.5 GeV in the intermediate pT region of 2.4-3.6 GeV/c. We further evaluate empirically the strange quark pT distributions at hadronization by studying the Ω/φ ratios scaled by the number of constituent quarks (NCQ). The NCQ-scaled Ω/φ ratios show a suppression of strange quark production in central collisions at 11.5 GeV compared to sNN≥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.
    Citation to related work
    American Physical Society (APS)
    Has part
    Physical Review C
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/5716
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