Dear Dr. Julian Felix

We would like to formally invite you to the 4th International Workshop "High Energy Physics in the LHC Era", January 4-10 2012, and the "3rd international Workshop for the Design of the ANDES Underground Laboratory", January 11-12, to take place in Valparaíso, Chile.

These workshops will be held at the picturesque campus of the Technical University Federico Santa Maria. For more information and registration, please visit the website: http://www.fis.utfsm.cl/hep2012.

The goal of the "HEP in the LHC Era" workshop is to bring together young and senior scientists, theorists and experimentalists, to review recent progress in High Energy Physics. The program of the Workshop will address a broad range of topics covering the main areas of high-energy particle and nuclear physics, and several topics of current interest: recent LHC and Tevatron experimental results; Dark Matter searches; Neutrino physics; High-Energy QCD; Heavy ion collisions; phenomenology of AdS/CFT; astroparticles, and other topics. We strongly encourage presentations of physics results from experimental HEP labs (CERN, RHIC, HERA, JLAB, Tevatron, etc.) and also expect that theory talks will go beyond the scope of the physics from these facilities. We kindly invite and encourage you to deliver a talk at the workshop on one of the program topics.

This event will be followed by a two-day workshop on the ANDES Underground Laboratory, dedicated to the design of this newly planned Underground facility and the Physics and other scientific prospects for the Lab. Even though these are separate workshops, you are welcome to participate in both.

The location of the workshop offers its own unique backdrop. The port of Valparaíso, a UNESCO World Heritage City, is famous for its hills, late 19th century architecture, and public elevators that lead to spectacular views of the bay. Neighboring Viña del Mar offers long beaches and beautiful gardens. You may even consider coming a few days prior to the workshop to celebrate the New Year with the continent`s largest fireworks display.

We look forward to your positive response.

With kind regards,

The Organizing Committee