• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/081/05/0791-0798

    • Keywords

       

      Event shape; quantum chromodynamics; next-to-next-to-leading order correction.

    • Abstract

       

      The next-to-next-to-leading order (NNLO) quantum chromodynamics (QCD) correction to the first three moments of the four event-shape variables in electron–positron annihilation, the thrust, heavy jet mass, wide, and total jet broadening, is computed. It is observed that the NNLO correction gives a better agreement between the theory and the experimental data. Also, by using the above observables, the strong coupling constant ($\alpha_{s}$) is determined and how much its value is affected by the NNLO correction is demonstrated. By combining the results for all variables at different centre-of-mass energies $\alpha_{s} (M_{Z^{\circ}}) = 0.1248 \pm 0.0009 ({\text{exp.}})_{-0.0144}^{+0.0283} ({\text{theo.}})$ is obtained.

    • Author Affiliations

       

      Samira Shoeibi Mohsenabadi1 Mohammad Ebrahim Zomorrodian1

      1. Department of Physics, Ferdowsi University of Mashhad, Mashhad 91775-1436, Iran
    • Dates

       
  • Pramana – Journal of Physics | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.