Top jets in the peak region: Factorization analysis with next-to-leading-log resummation

Authors:
  • SFSean Fleming
    Sean Fleming
  • AHAndre H. Hoang
    Andre H. Hoang
  • SMSonny Mantry
    Sonny Mantry
  • ISIain W. Stewart
    Iain W. Stewart
Publisher website
Google Scholar
Abstract
We consider top-quarks produced at large energy in e+e- collisions, and address the question of what top-mass can be measured from reconstruction. The production process is characterized by well separated scales: the center-of-mass energy, Q, the top mass, m, the top decay width, Gamma_t, and also LambdaQCD; scales which can be disentangled with effective theory methods. In particular we show how the mass measurement depends on the way in which soft radiation is treated, and that this can shift the mass peak by an amount of order Q LambdaQCD/m. We sum large logs for Q >> m >> Gamma_t > LambdaQCD and demonstrate that the renormalization group ties together the jet and soft interactions below the scale m. Necessary conditions for the invariant mass spectrum to be protected from large logs are formulated. Results for the cross-section are presented at next-to-leading order with next-to-leading-log resummation, for invariant masses in the peak region and the tail region. Using our results we also predict the thrust distribution for massive quark jets at NLL order for large thrust. We demonstrate that soft radiation can be precisely controlled using data on massless jet production, and that in principle, a short distance mass parameter can be measured using jets with precision better than LambdaQCD.Comment: 92 pages, 22 figs, typos corrected, journal versio

This publication has 98 references indexed in Scilit: