Title : ( Next-to-next-to-leading order calculation of the strong coupling constant αs by using moments of event-shape variables )
Authors: Mohammad Ebrahim Zomorrodian , SAMIRA SHOEIBI MOHSENABADI ,
Full TextAbstract
We compute the Next-to-Next-to- Leading order (NNLO) QCD correction to the first three moment of four event shape variables in electron-positron annihilation; the Thrust, Heavy jet Mass , Wide ,and Total jet Broadening. We observe that NNLO correction yields a better agreement between the theory and the experimental data. Also, by using the above observables, we determine strong coupling constant (α_s) and demonstrate how much its value is affected by NNLO correction. By combining the results for all variables and for different center-of-mass energies, we find α_s(M_(z^0 )) = 0.1248+ ̅0.0009 (exp.) ■(+0.0282@-0.0143) (theo.). Possible explanation for these futures will be
Keywords
, event shape;quantum chromodynamics;next, to, next, toleading order corrections
@article{paperid:1039156,
author = {Zomorrodian, Mohammad Ebrahim and SHOEIBI MOHSENABADI, SAMIRA},
title = {Next-to-next-to-leading order calculation of the strong coupling constant αs by using moments of event-shape variables},
journal = {Pramana - Journal of Physics},
year = {2013},
volume = {81},
number = {5},
month = {August},
issn = {0304-4289},
pages = {791--798},
numpages = {7},
keywords = {event shape;quantum chromodynamics;next-to-next-toleading order corrections},
}
%0 Journal Article
%T Next-to-next-to-leading order calculation of the strong coupling constant αs by using moments of event-shape variables
%A Zomorrodian, Mohammad Ebrahim
%A SHOEIBI MOHSENABADI, SAMIRA
%J Pramana - Journal of Physics
%@ 0304-4289
%D 2013
