Measurement of b quark EW couplings at ILC

Abstract

This paper describes an analysis performed at 250 GeV centre of mass energy for the reaction e+e- -> bbbar with the International Linear Collider, ILC, assuming an integrated luminosity of 500 fb-1. This measurement requires determining the b quark charge, which can be optimally performed using the precise micro-vertex detector of the detector ILD and the charged kaon identification provided by the dE/dx information of its TPC. Given that the forward backward asymmetry is maximal for e-L (Left-handed electron polarisation), it has been necessary to develop a new method to correct for unavoidable angular migration due to b charge mis-measurements. This correction is based on the reconstructed events themselves without introducing external corrections which would induce large uncertainties. With polarized beams, one can separate the Z and photon vector and axial couplings to b quarks. The precision reached is at the few per mill level, and should allow to confirm/discard the deviation observed at LEP1 on the ZbRbR coupling. Model independent upper bounds on the tensor couplings, F2V and F2A, are derived using the shape of the angular distribution.

16 pages, 8 figures

References in corpus (2)

• ILC Operating Scenarios
• Warped Electroweak Breaking Without Custodial Symmetry

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• Study of fermion pair productions at the ILC with center-of-mass energy of 250 GeV
• Linear Collider Signals of $Z^{\prime }$ Bosons in GUT Inspired Gauge-Higgs Unification