Now showing items 1-6 of 6

    • Beam Thrust Cross Section for Drell-Yan Production at Next-to-Next-to-Leading-Logarithmic Order 

      Stewart, Iain; Tackmann, Frank; Waalewijn, Wouter Jonathan (American Physical Society, 2011-01)
      At the LHC and Tevatron strong initial-state radiation (ISR) plays an important role. It can significantly affect the partonic luminosity available to the hard interaction or contaminate a signal with additional jets and ...
    • Chiral anomaly in soft collinear effective theory 

      Waalewijn, Wouter Jonathan (American Physical Society, 2009-02)
      Anomalies have infrared and ultraviolet ingredients, and are often realized in effective theories in a nontrivial way. We study the chiral anomaly in soft collinear effective theory (SCET), where the anomaly equation has ...
    • Factorization at the LHC: From parton distribution functions to initial state jets 

      Tackmann, Frank; Waalewijn, Wouter Jonathan; Stewart, Iain (American Physical Society, 2010-05)
      We study proton-(anti)proton collisions at the LHC or Tevatron in the presence of experimental restrictions on the hadronic final state and for generic parton momentum fractions. At the scale Q of the hard interaction, ...
    • Generalized fragmentation functions for fractal jet observables 

      Elder, Benjamin Tyler; Procura, Massimiliano; Thaler, Jesse; Waalewijn, Wouter Jonathan; Zhou, Kevin (Springer Berlin Heidelberg, 2017-06)
      We introduce a broad class of fractal jet observables that recursively probe the collective properties of hadrons produced in jet fragmentation. To describe these collinear-unsafe observables, we generalize the formalism ...
    • N Jettiness: An Inclusive Event Shape to Veto Jets 

      Stewart, Iain; Tackmann, Frank; Waalewijn, Wouter Jonathan (American Physical Society, 2010-08)
      Jet vetoes are essential in many analyses at the LHC and Tevatron. Typical signals have a specific number of hard jets or leptons, while backgrounds have additional jets. Vetoing undesired jets efficiently discriminates ...
    • The quark beam function at NNLL 

      Stewart, Iain; Tackmann, Frank; Waalewijn, Wouter Jonathan (Springer / SISSA, 2010-09)
      In hard collisions at a hadron collider the most appropriate description of the initial state depends on what is measured in the final state. Parton distribution functions (PDFs) evolved to the hard collision scale Q are ...