scholarly journals Λ( Unknown node mover found in MathML fragment. $ \bar {\Lambda } $ ) polarization in Au+Au collisions at RHIC

2019 ◽  
Vol 206 ◽  
pp. 04003
Author(s):  
Biao Tu
Keyword(s):  
Angular Momentum ◽  
Azimuthal Angle ◽  
Heavy Ion ◽  
Emission Angle ◽  
Relativistic Heavy Ion Collisions ◽  
Peripheral Collision ◽  
Ion Collisions ◽  
200 Gev ◽  
Unknown Node ◽  
Strong Vorticity

Initial large global angular momentum in non-central relativistic heavy-ion collisions can produce strong vorticity, and through the spin-orbit couping, causes the spin of particles to align with the system’s global angular momentum. We present the azimuthal angle dependent (relative to the first-order plane) global polarization for Λ hyperons in midcentral Au+Au collisions at $ \sqrt {S_{NN} } $ = 200 GeV. We also present the polarization of Λ hyperons along the beam direction as a function of Λ hyperons’ emission angle relative to the second-order event plane at $ \sqrt {S_{NN} } $ = 200 GeV. This longitudinal polarization is found to increase in more peripheral collision. The implications of the results are discussed.

scholarly journals ϕ Meson Spin Alignment and the Azimuthal Angle Dependence of Λ (Λ) Polarization in Au+Au collisions at RHIC

2018 ◽  
Vol 171 ◽  
pp. 16007
Author(s):  
Biao Tu
Keyword(s):  
Angular Momentum ◽  
Azimuthal Angle ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Spin Orbit Coupling ◽  
Spin Alignment ◽  
Angle Dependence ◽  
Ion Collisions ◽  
200 Gev ◽  
Strong Vorticity

Initial large global angular momentum in non-central relativistic heavy-ion collisions can produce strong vorticity, and through the spin-orbit coupling, causes the spin of particles to align with the system’s global angular momentum. We present the azimuthal angle dependent (relative to the reaction plane) polarization for Λ and Λ in mid-central Au+Au collisions at [see formula in PDF] = 200 GeV. We also present the ϕ meson spin alignment parameter, ρ00 in Au+Au collisions at [see formula in PDF] = 19.6, 27, 39, 62.4 and 200 GeV. The implications of the results are discussed.

PRODUCTION OF DILEPTONS BY BREMSSTRAHLUNG DURING THE STOPPING OF RELATIVISTIC HEAVY IONS

1989 ◽  
Vol 04 (16) ◽  
pp. 4221-4234 ◽  
Author(s):  
THOMAS LIPPERT ◽  
NORBERT GRÜN ◽  
WERNER SCHEID
Keyword(s):  
Probability Distributions ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Lepton Pairs ◽  
Differential Probability ◽  
First Order ◽  
Central Collisions ◽  
Ion Collisions ◽  
Muon Pairs ◽  
200 Gev

Lepton pairs are created by the bremsstrahlung during the stopping of nuclei in relativistic heavy ion collisions. The probability distribution for central collisions is derived in the first order perturbation theory. For the nuclear current density, a model is used which assumes point-like nuclear charges and a velocity of the nuclei parametrized with respect to the deceleration and transparency of the reaction. Differential probability distributions for muon pairs are calculated for central collisions of 238 U on 238 U at E lab = 200 GeV/nucleon .

scholarly journals A Systematic Study of Magnetic Field in Relativistic Heavy-Ion Collisions in the RHIC and LHC Energy Regions

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Yang Zhong ◽  
Chun-Bin Yang ◽  
Xu Cai ◽  
Sheng-Qin Feng
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Heavy Ion Collisions ◽  
Field Model ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Collision Time ◽  
Ion Collisions ◽  
200 Gev ◽  
Magnetic Field Model

The features of magnetic field in relativistic heavy-ion collisions are systematically studied by using a modified magnetic field model in this paper. The features of magnetic field distributions in the central point are studied in the RHIC and LHC energy regions. We also predict the feature of magnetic fields at LHCsNN=900, 2760, and 7000 GeV based on the detailed study at RHICsNN=62.4, 130, and 200 GeV. The dependencies of the features of magnetic fields on the collision energies, centralities, and collision time are systematically investigated, respectively.

The effects of angular momentum conservation in relativistic heavy ion collisions

2007 ◽  
Author(s):  
F. Becattini ◽  
F. Piccinini ◽  
Pietro Colangelo ◽  
Donato Creanza ◽  
Fulvia De Fazio ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Momentum Conservation ◽  
Relativistic Heavy Ion Collisions ◽  
Angular Momentum Conservation ◽  
Ion Collisions

Production of strange resonances in AA collisions at $\sqrt{s_{{\it NN}}} = 17.3$, 62.4 and 200 GeV

2014 ◽  
Vol 23 (10) ◽  
pp. 1450060 ◽  
Author(s):  
Kai-Chun Liu ◽  
Jun Song ◽  
Feng-Lan Shao
Keyword(s):  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Ion Collisions ◽  
Urqmd Model ◽  
Momentum Spectra ◽  
200 Gev ◽  
Transverse Momentum Spectra ◽  
Final Observation ◽  
Hadronic Resonances ◽  
Aa Collisions

Hadronic resonances measured experimentally by invariant mass reconstruction in relativistic heavy-ion collisions contain contributions from different production channels and/or stages, i.e., leftovers of primordial hadronization, regenerations in hadronic rescatterings and those decayed from heavier resonances. We use a UrQMD model to systematically calculate the proportions of these different channels in final observation of resonances K*(892), Σ*(1385), ϕ(1020), Ξ*(1530) and Λ(1520) and investigate the time evolution of these resonance productions in AA collisions at [Formula: see text], 62.4 and 200 GeV. We study the yields, transverse momentum spectra and elliptic flows of these resonances and discuss the survival information of the primordial hadronization in final observations.

scholarly journals Anisotropic (v1 and v2) Flow in Relativistic Heavy-Ion Collisions at Energies between 4 GeV and 200 GeV

2018 ◽  
Vol 191 ◽  
pp. 05004
Author(s):  
L.V. Bravina ◽  
Yu. Kvasiuk ◽  
S.Yu. Sivoklokov ◽  
O. Vitiuk ◽  
E.E. Zabrodin
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Relativistic Heavy Ion Collisions ◽  
High Energies ◽  
Ion Collisions ◽  
200 Gev ◽  
Basic Features ◽  
String Models ◽  
Freeze Out

Basic features of directed and elliptic flows of identified hadrons in heavy-ion collisions at intermediate and high energies are considered within two transport string models, UrQMD and QGSM. Both models indicate changing of the sign of proton directed flow at midrapidity from antiflow to normal flow with decreasing energy of collisions. The origin of this effect is traced to hadron rescattering in baryon-rich remnants of the colliding nuclei. To distinguish the effect of rescattering from the flow softening caused by creation of quark-gluon plasma one has to compare heavy-ion and light-ion collisions at the same energy. Both directed and elliptic flows at midrapidity are formed within t = 10-12 fm/c. The differences in the development of elliptic flows of mesons and baryons are found at high energies. These differences can be explained by dissimilar freeze-out conditions, thus suggesting simultaneous study of particle collective flow and freeze-out.

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