We investigate the hadron production from the vortical quark-gluon plasma created in heavy-ion collisions. Based on the quark-coalescence and statistical hadronization models, we show that total hadron yields summed over the spin components are enhanced by the local vorticity with quadratic dependence. The enhancement factor amounts to be a few percent and may be detectable within current experimental sensitivities. We also show that the effect is stronger for hadrons with larger spin, and thus propose a new signature of the local vorticity, which may be detected by the yield ratio of distinct hadron species having different spins such as φ and η′. The vorticity dependence of hadron yields seems robust, with consistent predictions in both of the hadron production mechanisms for reasonable values of the vorticity strength estimated for heavy-ion collisions.
|Journal||Physical Review C|
|Publication status||Published - 2020 Aug|
Bibliographical noteFunding Information:
Acknowledgments. The authors would like to thank Takafumi Niida for fruitful discussions during the international molecule-type workshop at Yukawa Institute for Theoretical Physics (YITP) “Hadron Interactions and Polarization from Lattice QCD, Quark Model, and Heavy Ion Collisions (YITP-T-18-07),” where this work was initiated. The authors also would like to thank participants of another YITP workshop of the same type “Quantum kinetic theories in magnetic and vortical fields (YITP-T-19-06)” for discussions. H.T. was supported by National Natural Science Foundation in China (NSFC) under Grant No. 11847206. X.-G.H. was supported by NSFC under Grants No. 11535012 and No. 11675041. S.H.L. was supported by Samsung Science and Technology Foundation under Project No. SSTF-BA1901-04. S.C. was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2018R1A5A1025563) and (No. 2019R1A2C1087107). D.-L.Y. was supported by Keio Institute of Pure and Applied Sciences (KiPAS) project in Keio University and the Grant-in-Aid for Early-Career Scientists (JSPS KAKENHI Grant No. JP20K14470). P.G. is supported by the Grant-in-Aid for Early-Carrier Scientists (JSPS KAKENHI Grant No. JP18K13542), Grant-in-Aid for Scientific Research (C) (JSPS KAKENHI Grant No. JP20K03940), and the Leading Initiative for Excellent Young Researchers (LEADER) of the Japan Society for the Promotion of Science (JSPS). A.M. was supported by JSPS KAKENHI Grant No. JP19K14722. A.O. was supported by JSPS KAKENHI Grants No. JP19H05151 and No. JP19H01898. K.H. is partially supported by Grant-in-Aid for Scientific Research (C) (JSPS KAKENHI Grant No. JP20K03948).
© 2020 American Physical Society.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics