Speaker
Jenny List
(Deutsches Elektronen-Synchrotron (DE))
Description
A unique feature of the future e+e- linear collider is the ability to provide
longitudinal polarised beams. In order to fully exploit the benefits of the
polarised beams, the luminosity weighted average polarisation needs to be known
with a permille-level precision. A method for measuring the beam polarisation
from the collision data is presented. It is based on a realistic full
simulation study of the semi-leptonic W-pair production in e+e- annihilation at
the ILC at centre-of-mass energies of 500 GeV and 1 TeV with the ILD detector.
Assuming that the angular distributions of the W-pair production are described
by the Standard Model, the longitudinal polarisation of the electron and
positron beams is measured with high accuracy. The W-pair events and the
angular distributions for the final state qqlnu are also used to determine the
triple gauge couplings. Results from a simultaneous measurement of the beams'
polarisation and the TGCs show that they can be determined independently and
thus the method would not be compromised by indirect contributions from physics
beyond the Standard Model.
Primary authors
Aura Rosca
(External)
Ivan Marchesini
(Hamburg University (DE))
