scholarly journals Spin alignment measurements of theK*0(892)andϕ(1020)vector mesons in heavy ion collisions atsNN=200GeV

2008 ◽  
Vol 77 (6) ◽  
Author(s):  
B. I. Abelev ◽  
M. M. Aggarwal ◽  
Z. Ahammed ◽  
B. D. Anderson ◽  
D. Arkhipkin ◽  
...  
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Vector Mesons ◽  
Spin Alignment ◽  
Ion Collisions

scholarly journals Local spin alignment of vector mesons in relativistic heavy-ion collisions

2021 ◽  
Vol 817 ◽  
pp. 136325
Author(s):  
Xiao-Liang Xia ◽  
Hui Li ◽  
Xu-Guang Huang ◽  
Huan Zhong Huang
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Vector Mesons ◽  
Spin Alignment ◽  
Local Spin ◽  
Ion Collisions

scholarly journals Spin alignment measurement of vector mesons produced in high energy collisions

2021 ◽  
Vol 36 (39) ◽  
Author(s):  
Bedangadas Mohanty ◽  
Sourav Kundu ◽  
Subhash Singha ◽  
Ranbir Singh
Keyword(s):  
Density Matrix ◽  
Vector Meson ◽  
Spin Density ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Spin Density Matrix ◽  
Vector Mesons ◽  
Spin Alignment ◽  
Alignment Effect ◽  
Ion Collisions

This paper covers the recent experimental development on spin alignment measurements of [Formula: see text] and [Formula: see text] vector mesons in heavy-ion and [Formula: see text] collisions at RHIC and LHC energies. Measurements in [Formula: see text] collisions at LEP energies are also discussed. Spin alignment of vector mesons is studied by measuring the second diagonal element [Formula: see text] of spin density matrix. The spin density matrix element [Formula: see text] is obtained by measuring the angular distribution of vector meson decay daughter with respect to the quantization axis in vector meson rest frame. Measured [Formula: see text] values for vector mesons are found to be larger than [Formula: see text] at high momentum in [Formula: see text] collisions at LEP energies, suggesting the preferential production of vector meson with helicity zero state from the fragmentation process. The [Formula: see text] values are found to be smaller than [Formula: see text] ([Formula: see text] implies no spin alignment) for [Formula: see text] and [Formula: see text] vector mesons at low transverse momentum in Pb–Pb collisions at [Formula: see text] TeV. These observations are qualitatively consistent with the expectation from models which attribute the spin alignment effect due to polarization of quarks in the presence of large initial angular momentum in noncentral heavy-ion collisions and its subsequent hadronization by the process of recombination. No significant spin alignment effect is observed for [Formula: see text] [Formula: see text] in mid-central Pb–Pb collisions and for vector mesons in [Formula: see text] collisions. However, the preliminary results of [Formula: see text] for [Formula: see text] mesons are larger than [Formula: see text] at intermediate [Formula: see text] in Au–Au collisions at RHIC energies and can be attributed to the presence of [Formula: see text] meson field. Although there is evidence of spin alignment effect of vector mesons in heavy-ion collisions but the measured effect is surprisingly larger in context of hyperon polarization. Therefore, these results will trigger further theoretical study.

scholarly journals Di-electron production from vector mesons with medium modifications in heavy ion collisions

2012 ◽  
Vol 85 (2) ◽  
Author(s):  
Hao-jie Xu ◽  
Hong-fang Chen ◽  
Xin Dong ◽  
Qun Wang ◽  
Yi-fei Zhang
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Vector Mesons ◽  
Ion Collisions ◽  
Electron Production ◽  
Medium Modifications

Influence of In-Medium Properties of Vector Mesons on Dilepton Production in Heavy Ion Collisions at SIS Energies

2006 ◽  
Vol 27 (4) ◽  
pp. 441-449
Author(s):  
M.D. Cozma ◽  
E. Santini ◽  
C. Fuchs ◽  
A. Faessler ◽  
B.V. Martemyanov ◽  
...  
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Vector Mesons ◽  
Dilepton Production ◽  
Ion Collisions
Sign in / Sign up

Export Citation Format

Share Document