Freiburg 2008 – scientific programme

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T: Fachverband Teilchenphysik

T 35: Top-Physik IV

T 35.4: Talk

Thursday, March 6, 2008, 17:30–17:45, KGI-HS 1098

Sensitivity to the single-top channels of the ATLAS experiment : study of systematic uncertainties — •Gia Khoriauli and Markus Cristinziani — Physikalisches Institut, Universität Bonn

The measurement of the single top quark production cross section at the LHC will provide an accurate direct determination of the CKM Matrixelement V_tb. Theories beyond the Standard Model predict different modifications in the three channels, the t− , s− and Wt−channel, and it is therefore important to measure them separately.

We present a study of the systematic uncertainties for the three channels. In particular the contributions from the parton distribution functions uncertainty is estimated, using different error parameterizations and Monte-Carlo generators for the hard process and showering. Other uncertainties include the renormalization and factorization scales and the b-fragmentation parameterisation.