The LEP2 data set on the Bhabha process is analyzed with the aim to detect the signals of the heavy virtual Z ′ gauge bosons. The state interacting with the left-handed standard-model doublets and called the Chiral Z ′ is investigated. This particle was introduced already as the low-energy state allowed by the renormalizability of the model. The contribution of the Chiral Z ′ state to the Bhabh...

The aim of this note is to characterize briefly main components of theoretical error of the small angle Bhabha measurement at LEP and to discuss critically how solid these estimates really are, from todays perspective. We conclude that the existing theoretical error of the LEP luminometer process (small angle Bhabha) is rather solid, and we add some new discussion concerning the remaining uncer...

The method for obtaining functional equations, recently proposed by one of the authors [1], is applied to one-loop box integrals needed in calculations of radiative corrections to heavy-quark production and Bhabha scattering. We present relationships between these integrals with different arguments and box integrals with all propagators being massless. It turns out that functional equations are...