scholarly journals Energy loss of heavy quarks in the isotropic collisional hot QCD medium

2019 ◽  
Vol 79 (9) ◽  
Author(s):  
M. Yousuf Jamal ◽  
Vinod Chandra
Keyword(s):  
Energy Loss ◽  
Transport Theory ◽  
Bottom Quark ◽  
Charm Quark ◽  
Heavy Quarks ◽  
Momentum Dependence ◽  
Temperature Dependent ◽  
Medium Effects ◽  
Relaxation Time Approximation ◽  
Classical Transport

Abstract The collisional energy loss of heavy partons (charm and bottom quarks) has been determined within the framework of semi-classical transport theory implying the Bhatnagar–Gross–Krook (BGK) collisional kernel. Hot QCD medium effects have been incorporated while employing a quasi-particle description of the medium in terms of effective gluons, quarks and antiquarks with respective temperature dependent effective fugacities. The momentum dependence of the energy loss for the charm and the bottom quark has been investigated. It is observed that with the increase in momentum of the heavy quarks, the loss increases sharply for the smaller values and reaches saturation later. Furthermore, as compared to the charm quark, the bottom quark loses less energy at a particular momentum and collisional frequency. The energy loss is seen to increase with increasing collisional frequency. We also provide a comparative study of the results obtained using the BGK kernel rather than those using the relaxation time approximation (RTA) kernel and found them to be consistent with each other. The medium effects in all the situations are seen to play a quite significant role.

scholarly journals Dielectric functions and dispersion relations of ultra-relativistic plasmas with collisions

2004 ◽  
Vol 82 (9) ◽  
pp. 671-678 ◽  
Author(s):  
M E Carrington ◽  
T Fugleberg ◽  
D Pickering ◽  
M H Thoma
Keyword(s):  
Quark Gluon Plasma ◽  
Transport Theory ◽  
Plasma Waves ◽  
Gluon Plasma ◽  
Dispersion Relations ◽  
Time Approximation ◽  
Relativistic Plasmas ◽  
Relaxation Time Approximation ◽  
Electron Positron ◽  
Classical Transport

In the present paper, we calculate the dielectric functions of an ultra-relativistic plasma, such as an electron–positron or a quark–gluon plasma. We use classical transport theory and take into account collisions within the relaxation time approximation. From these dielectric functions we derive the dispersion relations of longitudinal and transverse plasma waves. PACS Nos.: 12.38.Mh, 52.25.Dg, 52.27.Ep, 52.35.Hr

scholarly journals Energy loss versus energy gain of heavy quarks in a hot medium

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
Mohammad Yousuf Jamal ◽  
Santosh K. Das ◽  
Marco Ruggieri
Keyword(s):  
Energy Loss ◽  
Heavy Quarks ◽  
Energy Gain

In Situ Analysis of Surface Contaminant Desorption during Low-Temperature Silicon Substrate Cleaning using Reflection Electron Energy Loss Spectrometry

1992 ◽  
Vol 259 ◽  
Author(s):  
Selmer S. Wong ◽  
Shouleh Nikzad ◽  
Channing C. Ahn ◽  
Aimee L. Smith ◽  
Harry A. Atwater
Keyword(s):  
Low Temperature ◽  
Energy Loss ◽  
Electron Energy ◽  
Core Loss ◽  
Temperature Dependent ◽  
Electron Energy Loss Spectrometry ◽  
Analysis Technique ◽  
Chemical Analysis Technique ◽  
Electron Energy Loss

ABSTRACTWe have employed reflection electron energy loss spectrometry (REELS), a surface chemical analysis technique, in order to analyze contaminant coverages at the submonolayer level during low-temperature in situ cleaning of hydrogen-terminated Si(100). The chemical composition of the surface was analyzed by measurements of the C K, O K and Si L2,3 core loss intensities at various stages of the cleaning. These results were quantified using SiC(100) and SiO2 as reference standards for C and O coverage. Room temperature REELS core loss intensity analysis after sample insertion reveals carbon at fractional monolayer coverage. We have established the REELS detection limit for carbon coverage to be 5±2% of a monolayer. A study of temperature-dependent hydrocarbon desorption from hydrogen-terminated Si(100) reveals the absence of carbon on the surface at temperatures greater than 200°C. This indicates the feasibility of epitaxial growth following an in situ low-temperature cleaning and also indicates the power of REELS as an in situ technique for assessment of surface cleanliness.

scholarly journals Effect of finite-range interactions in classical transport theory

2002 ◽  
Vol 65 (2) ◽  
Author(s):  
Sen Cheng ◽  
Scott Pratt ◽  
Peter Csizmadia ◽  
Yasushi Nara ◽  
Dénes Molnár ◽  
...  
Keyword(s):  
Transport Theory ◽  
Finite Range ◽  
Classical Transport

CHARM QUARK THERMALIZATION IN QUARK-GLUON PLASMA

2007 ◽  
Vol 16 (07n08) ◽  
pp. 2048-2054 ◽  
Author(s):  
LI YAN ◽  
PENGFEI ZHUANG ◽  
NU XU
Keyword(s):  
Relaxation Time ◽  
Quark Gluon Plasma ◽  
Transport Model ◽  
Charm Quark ◽  
Gluon Plasma ◽  
Transverse Momentum Distribution ◽  
Hydrodynamic Description ◽  
Charm Quarks ◽  
Relaxation Time Approximation ◽  
Quark Transverse Momentum

The charm quark thermalization in quark-gluon plasma is described by a transport model in relaxation time approximation. Combining the transport equation for charm quarks with the hydrodynamic description for the medium, we calculated the charm quark transverse momentum distribution and discussed its dependence on the relaxation time.

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