Helmholtz alliance linear collider forum

The Linear Collider Forum is an initiative born within the Helmholtz-Alliance ”Physics at the Terascale”, a network ofGerman Universities and Research Centers working in high-energy particle physics. Yearly dedicated meetings focuson the physics case and the technologies at a future linear collider, covering both the ILC and CLIC concepts. In February 2012 an extended meeting with significant international participation was dedicated to the discussion ofphysics scenarios to strengthen and update the case for a linear e+e- collider in light of new developments and thelatest LHC results. Contributions to LC Forum sessions were collected on the DESY LC-note server with a dedicated mark ‘LC-REP-year-number’. These Proceedings comprise all contributions that have been submitted with the dedicated mark in 2012 and 2013. Therefore also contributions are included that actually have not been presented on a LC Forum meeting but are stronglyrelated to the subject.