Azimuth quadrupole component spectra on transverse rapidity ${\bf y_t}$ for identified hadrons from Au-Au collisions at $\sqrt{s_{NN}} =$ 200 GeV
| dc.creator | Trainor, Thomas A. | |
| dc.date | 2008-03-27 | |
| dc.date | 2008-11-19 | |
| dc.date.accessioned | 2026-07-07T12:26:53Z | |
| dc.date.available | 2026-07-07T12:26:53Z | |
| dc.description | I present the first isolation of azimuth quadrupole components from published $v_2(p_t)$ data (called elliptic flow) as spectra on transverse rapidity $y_t$ for identified pions, kaons and lambdas/protons from minimum-bias Au-Au collisions at 200 GeV. The form of the spectra on $y_t$ indicates that the three hadron species are emitted from a common boosted source with boost $Δy_{t0} \sim 0.6$. The quadrupole spectra have a Lévy form similar to the soft component of the single-particle spectrum, but with significantly reduced ($\sim 0.7\times$) slope parameters $T$. Comparison of quadrupole spectra with single-particle spectra suggests that the quadrupole component comprises a small fraction ($< 5$%) of the total hadron yield, contradicting the hydrodynamic picture of a thermalized, flowing bulk medium. The form of $v_2(p_t)$ is, within a constant factor, the product of $p'_t$ ($p_t$ in the boost frame) times the ratio of quadrupole spectrum to single-particle spectrum. That ratio in turn implies that above 0.5 GeV/c the form of $v_2(p_t)$ is dominated by the hard component of the single-particle spectrum (interpreted as due to minijets). It is therefore unlikely that so-called {\em constituent-quark scaling} attributed to $v_2$ is relevant to soft hadron production mechanisms (e.g., chemical freezeout). | |
| dc.description | 22 pages, 17 figures | |
| dc.identifier | https://arxiv.org/abs/0803.4002 | |
| dc.identifier | http://arxiv.org/abs/0803.4002 | |
| dc.identifier | Phys.Rev.C78:064908,2008 | |
| dc.identifier | doi:10.1103/PhysRevC.78.064908 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/215028 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Azimuth quadrupole component spectra on transverse rapidity ${\bf y_t}$ for identified hadrons from Au-Au collisions at $\sqrt{s_{NN}} =$ 200 GeV | |
| dc.type | text |