Beam energy dependence of rapidity-even dipolar flow in Au+Au collisions
- New measurements of directed flow for charged hadrons, characterized by the Fourier coefficient v1, are presented for transverse momenta pT, and centrality intervals in Au+Au collisions recorded by the STAR experiment for the center-of-mass energy range √sN N = 7.7–200 GeV. The measurements underscore the importance of momentum conservation, and the characteristic dependencies on √sN N , centrality and pT are consistent with the expectations of geometric fluctuations generated in the initial stages of the collision, acting in concert with a hydrodynamic-like expansion. The centrality and pT dependencies of veven 1 , as well as an observed similarity between its excitation function and that for v3, could serve as constraints for initial-state models. The veven 1 excitation function could also provide an important supplement to the flow measurements employed for precision extraction of the temperature dependence of the specific shear viscosity.
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| URN: | urn:nbn:de:hebis:30:3-700393 |
|---|---|
| DOI: | https://doi.org/10.1016/j.physletb.2018.07.013 |
| ISSN: | 0370-2693 |
| ISSN: | 1873-2445 |
| ArXiv Id: | http://arxiv.org/abs/1804.08647 |
| Parent Title (English): | Physics letters B |
| Publisher: | Elsevier |
| Place of publication: | Amsterdam |
| Document Type: | Article |
| Language: | English |
| Date of Publication (online): | 2018/09/10 |
| Date of first Publication: | 2018/09/10 |
| Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
| Creating Corporation: | STAR Collaboration |
| Release Date: | 2022/09/26 |
| Volume: | 784 |
| Page Number: | 7 |
| First Page: | 26 |
| Last Page: | 32 |
| Institutes: | Physik / Physik |
| Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Sammlungen: | Universitätspublikationen |
| Licence (German): |  Creative Commons - Namensnennung 4.0 |
