Spin polarization and alignment in heavy-ion collisions
We report the measurements of global spin polarization of hyperons (PΛ) from FAIR, RHIC and LHC energies. The PΛ continues to follow an increasing trend at √SNN < 7.7SNN<7.7 GeV indicating that enormous vorticity prevails even in hadronic dominant region. New measurements of local spin polariz...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2023-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2023/02/epjconf_sqm2022_06012.pdf |
| _version_ | 1811157420527845376 |
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| author | Singha Subhash |
| author_facet | Singha Subhash |
| author_sort | Singha Subhash |
| collection | DOAJ |
| description | We report the measurements of global spin polarization of hyperons (PΛ) from FAIR, RHIC and LHC energies. The PΛ continues to follow an increasing trend at √SNN < 7.7SNN<7.7 GeV indicating that enormous vorticity prevails even in hadronic dominant region. New measurements of local spin polarization (Pz,2) from isobar collisions follow the same pattern observed in previous RHIC and LHC energies. An observable motivated by predicted baryonic Spin Hall Effect, the net local polarization (Pz,2net)(Pz,2net), show a negative value in Au+Au collisions at √SNN = 19.6SNN=19.6 and 27 GeV. The first Pz measurement with respect to third order harmonic in 200 GeV RHIC isobar collisions shows a non-zero sine modulation, indicating the presence of complex vortical structure in the medium. Surprising new patterns of spin alignment (ρ00) for various vector mesons (K*0, K*±, ϕ and J/ψ emerged at both RHIC and LHC energies. The large deviation in ρ00 of several species poses challenge to the theory. |
| first_indexed | 2024-04-10T05:07:12Z |
| format | Article |
| id | doaj.art-6ffd04ee472944d89449eda717495072 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-04-10T05:07:12Z |
| publishDate | 2023-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-6ffd04ee472944d89449eda7174950722023-03-09T12:03:02ZengEDP SciencesEPJ Web of Conferences2100-014X2023-01-012760601210.1051/epjconf/202327606012epjconf_sqm2022_06012Spin polarization and alignment in heavy-ion collisionsSingha Subhash0Institute of Modern Physics Chinese Academy of SciencesWe report the measurements of global spin polarization of hyperons (PΛ) from FAIR, RHIC and LHC energies. The PΛ continues to follow an increasing trend at √SNN < 7.7SNN<7.7 GeV indicating that enormous vorticity prevails even in hadronic dominant region. New measurements of local spin polarization (Pz,2) from isobar collisions follow the same pattern observed in previous RHIC and LHC energies. An observable motivated by predicted baryonic Spin Hall Effect, the net local polarization (Pz,2net)(Pz,2net), show a negative value in Au+Au collisions at √SNN = 19.6SNN=19.6 and 27 GeV. The first Pz measurement with respect to third order harmonic in 200 GeV RHIC isobar collisions shows a non-zero sine modulation, indicating the presence of complex vortical structure in the medium. Surprising new patterns of spin alignment (ρ00) for various vector mesons (K*0, K*±, ϕ and J/ψ emerged at both RHIC and LHC energies. The large deviation in ρ00 of several species poses challenge to the theory.https://www.epj-conferences.org/articles/epjconf/pdf/2023/02/epjconf_sqm2022_06012.pdf |
| spellingShingle | Singha Subhash Spin polarization and alignment in heavy-ion collisions EPJ Web of Conferences |
| title | Spin polarization and alignment in heavy-ion collisions |
| title_full | Spin polarization and alignment in heavy-ion collisions |
| title_fullStr | Spin polarization and alignment in heavy-ion collisions |
| title_full_unstemmed | Spin polarization and alignment in heavy-ion collisions |
| title_short | Spin polarization and alignment in heavy-ion collisions |
| title_sort | spin polarization and alignment in heavy ion collisions |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2023/02/epjconf_sqm2022_06012.pdf |
| work_keys_str_mv | AT singhasubhash spinpolarizationandalignmentinheavyioncollisions |