Transverse Momentum Distributions from Effective Field Theory

por Sonny Mantry (Wisconsin University)

martes 5 abr. 2011 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

Transverse momentum (pT) distributions of electroweak gauge and Higgs bosons are of interest for a precision determination of the W-boson mass, Higgs search strategies, tests of perturbative QCD, and unraveling nucleon structure. In the region of low pT, much smaller than the heavy boson mass, large logarithms spoil the perturbative expansion and must be resummed. This resummation has a dramatic effect on the pT-spectrum. We apply effective field theory techniques and derive a new factorization and resummation formula for the pT-spectrum which avoids ambiguities from the appearance of a Landau pole in traditional approaches. We give a comparison of our results with Tevatron data on the Z-boson pT-spectrum and a prediction for the Higgs boson spectrum.