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

Sean P Fleming, Andre H. Hoang, Sonny Mantry, Iain W. Stewart

Research output: Contribution to journalArticle

127 Citations (Scopus)

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 Γt, and also ΛQCD; 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 QΛQCD/m. We sum large logs for Q Γt>ΛQCD 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 ΛQCD.

Original languageEnglish (US)
Article number114003
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume77
Issue number11
DOIs
StatePublished - Jun 5 2008

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factorization
Factorization
quantum chromodynamics
thrust distribution
quarks
Radiation
radiation
Top Quark
Invariant
thrust
mass spectra
Tie
center of mass
Barycentre
Energy
Renormalization Group
Demonstrate
Quarks
Tail
Cross section

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics

Cite this

Top jets in the peak region : Factorization analysis with next-to-leading-log resummation. / Fleming, Sean P; Hoang, Andre H.; Mantry, Sonny; Stewart, Iain W.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 77, No. 11, 114003, 05.06.2008.

Research output: Contribution to journalArticle

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