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T: Teilchenphysik

T 701: QCD Theorie II

T 701.2: Talk

Friday, March 31, 2006, 14:50–15:10, HG2-HS2

Renormalization Group analysis in NRQCD for squark pair production — •Pedro Ruiz-Femenia and Andre Hoang — Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut), Foehringer Ring 6, 80805 Muenchen

We present an effective field theory suitable to describe a non-relativistic particle-antiparticle pair of heavy scalars based on the gauge group SU(3). Its formulation is analogous to that of “velocity NRQCD" (vNRQCD), a non-relativistic effective theory for heavy quark pairs. The matching conditions with scalar QCD and the renormalization group evolution of the effective theory are discussed. The non-relativistic framework proposed here suffices to compute scalar-antiscalar bound state energies at next-to-next-to-leading-logarithmic (NNLL) order and next-to-leading-logarithmic (NLL) threshold production of squarks in e⁺e⁻ and γγ collisions, in particular of the lighter scalar top quark at a future Linear Collider.

[1] A. Hoang and P. Ruiz-Femenia, arXiv:hep-ph/0512165.