Freiburg 2008 – scientific programme

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T: Fachverband Teilchenphysik

T 15: Beyond the Standard Model (Theorie) I

T 15.3: Talk

Monday, March 3, 2008, 17:15–17:30, KGI-HS 1021

Electroweak Contributions to Squark Pair Production — •Sascha Bornhauser, Manuel Drees, Herbi Dreiner, and Jong Soo Kim — Physikalisches Institut, Universität Bonn, Nussallee 12, D53115 Bonn

If supersymmetry exists, the production of squark pairs is expected to play an important role at the Large Hadron Collider. Therefore, accurate predictions for their cross section are obviously of great interest. We computed the complete leading order contributions to squark pair production including electroweak s–,t– and u–channel diagrams. We show that the dominant new contributions are from the interference between electroweak and QCD interactions. These contributions can amount up to 10 to 20% for typical mSUGRA scenarios and the production of SU(2) doublet squarks. The size of the corrections lies between -40 and +55% for more general scenarios, depending on size and sign of the SU(2) gaugino mass.

The electroweak contributions can give rise to a rapidity region into which no QCD radiation is emitted. The reason for this is that electroweak interactions can produce a squark pair without any color connection between the squarks. These supersymmetric rapidity gap events might be detectable at the Large Hadron Collider.