Third Generation Quark and Electroweak Boson Couplings at the 250 GeV stage of the ILC
August 02, 2019
The 3rd generation quarks are, due to their large masses, highly sensitive probes for new physics connected to the
electroweak symmetry breaking. While top quark pair production requires center-of-mass energies of larger than 350 GeV,
the first stage of the ILC at a center-of-mass energy of 250 GeV can perform precision measurements of bottom quark pair production,
thereby settling the long standing ~3$\sigma$ tension between the LEP experiments and SLC experiment. For this measurement, polarised beams of the ILC are of special importance as they enable the separation of the vector and axial-vector couplings of the $b$-quark to $Z^0$ boson and photon.
Another important precision probe for new physics is triple gauge boson couplings. Thanks to the polarised beams and a much higher luminosity, a significant increase in precision beyond past and present experiments is expected at the first stage of the ILC for the TGCs involving $W^\pm$ bosons.
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