Polarized positrons and electrons at the linear collider

Abstract

The proposed International Linear Collider (ILC) is well-suited for discovering physics beyond the Standard Model and for precisely unraveling the structure of the underlying physics. The physics return can be maximized by the use of polarized beams. This report shows the paramount role of polarized beams and summarizes the benefits obtained from polarizing the positron beam, as well as the electron beam. The physics case for this option is illustrated explicitly by analyzing reference reactions in different physics scenarios. The results show that positron polarization, combined with the clean experimental environment provided by the linear collider, allows to improve strongly the potential of searches for new particles and the identification of their dynamics, which opens the road to resolve shortcomings of the Standard Model. The report also presents an overview of possible designs for polarizing both beams at the ILC, as well as for measuring their polarization.2

The International Linear Collider Technical Design Report - Volume 4: Detectors

“…In addition, the obtainable precisions assuming the full 1 ab ≠1 sample was collected with P ≠80,+20 are given. [393] demonstrate that having simultaneously polarised electron and positron beams will be very useful for the discovery of new particles, analysing signals in a model independent manner or resolving precisely the underlying model.…”

Top Partner Production at e+e- Collider in the Littlest Higgs Model with T-Parity

“…Considering the polarization of the initial electron and positron beams, the cross section at + − collider can be expressed as [71] …”

Precision Electroweak Measurements at a Future e+e- Linear Collider

“…The cross-section dependence on the longitudinal polarization of the electron and positron beams is given by [13] σ (P e − , P e + ) = 1 4…”