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Probing parton dynamics of QCD matter with Ω and φ production

Publication ,  Journal Article
Adamczyk, L; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Alekseev, I; Aparin, A; Arkhipkin, D; Aschenauer, EC; Attri, A; Averichev, GS ...
Published in: Physical Review C
February 24, 2016

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.

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Published In

Physical Review C

DOI

EISSN

2469-9993

ISSN

2469-9985

Publication Date

February 24, 2016

Volume

93

Issue

2
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Adamczyk, L., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Ahammed, Z., Alekseev, I., … Humanic, T. J. (2016). Probing parton dynamics of QCD matter with Ω and φ production. Physical Review C, 93(2). https://doi.org/10.1103/PhysRevC.93.021903
Adamczyk, L., J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, A. Aparin, et al. “Probing parton dynamics of QCD matter with Ω and φ production.” Physical Review C 93, no. 2 (February 24, 2016). https://doi.org/10.1103/PhysRevC.93.021903.
Adamczyk L, Adkins JK, Agakishiev G, Aggarwal MM, Ahammed Z, Alekseev I, et al. Probing parton dynamics of QCD matter with Ω and φ production. Physical Review C. 2016 Feb 24;93(2).
Adamczyk, L., et al. “Probing parton dynamics of QCD matter with Ω and φ production.” Physical Review C, vol. 93, no. 2, Feb. 2016. Scopus, doi:10.1103/PhysRevC.93.021903.
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, Hirsch A, Hoffmann GW, Horvat S, Huang T, Huang X, Huang B, Huang HZ, Huck P, Humanic TJ. Probing parton dynamics of QCD matter with Ω and φ production. Physical Review C. 2016 Feb 24;93(2).

Published In

Physical Review C

DOI

EISSN

2469-9993

ISSN

2469-9985

Publication Date

February 24, 2016

Volume

93

Issue

2