BOUND STATE AND RADIATIVE CORRECTIONS TO HEAVY QUARK FRAGMENTATION FUNCTIONS

1995 ◽  
Vol 10 (13n14) ◽  
pp. 1019-1026
Author(s):  
M.A. GOMSHI NOBARY
Keyword(s):  
Experimental Data ◽  
Heavy Quark ◽  
Bound State ◽  
Radiative Corrections ◽  
Gluon Radiation ◽  
Initial State ◽  
Quark Fragmentation ◽  
Theoretical Predictions ◽  
Fragmentation Functions ◽  
Theory And Experiment

We comment on heavy quark fragmentation models motivated by QCD and study the influence of bound state and radiative corrections on heavy quark fragmentation emphasizing the comparison between the theoretical predictions and experimental data. It seems that meson constituents internal motion and initial state QCD gluon radiation may have a kinematical role in improving the agreement between theory and experiment. These effects are more striking in the case of charm fragmentation.

scholarly journals TWO-PHOTON DECAY RATES OF HEAVY QUARKONIA IN THE RELATIVISTIC QUARK MODEL

2003 ◽  
Vol 18 (09) ◽  
pp. 601-607 ◽  
Author(s):  
D. EBERT ◽  
R. N. FAUSTOV ◽  
V. O. GALKIN
Keyword(s):  
Experimental Data ◽  
Quark Model ◽  
Relativistic Effects ◽  
Decay Rates ◽  
Heavy Quarkonia ◽  
Radiative Corrections ◽  
Relativistic Quark Model ◽  
Two Photon ◽  
Photon Decay ◽  
Theoretical Predictions

Two-photon decay rates of pseudoscalar, scalar and tensor states of charmonium and bottomonium are calculated in the framework of the relativistic quark model. Both relativistic effects and one-loop radiative corrections are taken into account. The obtained results are compared with other theoretical predictions and available experimental data.

scholarly journals Spin-dependent fragmentation functions of gluon splitting into heavy quarkonia considering three different scenarios

2015 ◽  
Vol 30 (32) ◽  
pp. 1550179 ◽  
Author(s):  
S. Mohammad Moosavi Nejad ◽  
Mahdi Delpasand
Keyword(s):  
Heavy Quark ◽  
Bound State ◽  
Heavy Quarkonia ◽  
Heavy Quarkonium ◽  
Heavy Quark Mass ◽  
Spin Singlet ◽  
Fragmentation Probability ◽  
Spin Triplet ◽  
Fragmentation Functions ◽  
Heavy Quark Pair

Heavy quarkonium production is a powerful implement to study the strong interaction dynamics and QCD theory. Fragmentation is the dominant production mechanism for heavy quarkonia with large transverse momentum. With the large heavy quark mass, the relative motion of the heavy quark pair inside a heavy quarkonium is effectively nonrelativistic and it is also well known that their fragmentation functions can be calculated in the perturbative QCD framework. Here, we analytically calculate the process-independent fragmentation functions for a gluon to split into the spin-singlet and spin-triplet [Formula: see text]-wave heavy quarkonia using three different scenarios. We will show that the fragmentation probability of the gluon into the spin-triplet bound-state is the biggest one.

Thermal Conductivity of Composites with Carbon Nanotubes: Theory and Experiment

2012 ◽  
Vol 1479 ◽  
pp. 101-106
Author(s):  
J. Ordonez-Miranda ◽  
C. Vales-Pinzon ◽  
J. J. Alvarado-Gil
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Theoretical Model ◽  
Size Effects ◽  
Polyester Resin ◽  
Thermal Design ◽  
Theoretical Predictions ◽  
Theory And Experiment ◽  
Composite Samples

ABSTRACTIn this work, the thermal conductivity of composites made up of carbon nanotubes embedded in a polyester resin is investigated by comparing experimental data with theoretical predictions. The composite samples were prepared with a random and aligned distribution of carbon nanotubes. Its thermal conductivity is then measured by using the photothermal radiometry technique. The obtained experimental data is accurately described by the proposed theoretical model, which takes into account the size effects of the nanotubes. It is expected that the obtained results can provide useful insights on the thermal design of composites based on carbon nanotubes.

Sign in / Sign up

Export Citation Format

Share Document