Top jets in the peak region : Factorization analysis with next-to-leading-log resummation
By S. Fleming, A. Hoang, S. Mantry, Iain W. Stewart. 2007
139 citations recorded by the source corpus.
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 Gammat, 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 QLambdaQCD/m. We sum large logs for Q>>m>>Gammat>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 (NLL) 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.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/9600ea6047d3dd9fec49a1c7f8370bb3ce0e6e6c
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In Nuclear and High Energy Physics
- W. Waalewijn
- A. Larkoski
- F. Tackmann
- Iain W. Stewart
- Jonathan R. Walsh
- I. Moult
- C. Vermilion
- A. Hornig
Citations in the corpus
- Resummation of heavy jet mass and comparison to LEP data (2010, background): “The result is that the hemisphere soft function itself factorizes into the form [5, 6, 22, 27 ]”
- The quark beam function at NNLL (2010, background): “S (αs).) The correct overall sign and i0 prescription for the logarithms can be deduced from the explicitly known one-loop result [1, 26 , 43].”
- Jet shapes and jet algorithms in SCET (2010, methodology): “Heavy quark jet mass distributions were resummed in SCET to NLL accuracy as part of a proposed method to extract the top quark mass in [ 52 ].”