High Energy Physics Theory ---- research opportunities at Cambridge?

Does anybody know if there is any research opportunity on HEP-theory at Cambridge? If there is, is it available to students taking math route? I intend to specialise in theoretical physics thus math route would be more suitable, and am a bit unsure as whether research opportunity would be open to mathmos.

Also, will you suggest me to write to the admission office to ask about whether one interested in HEP-theory should apply for maths or physics?

This is taken from the Natural Sciences page on our website:
Peterhouse has the strongest links to CERN of any college. Two of our teaching Fellows regularly work at CERN and one is the head of the physics department. They are:
Prof Andy Parker. Head of Physics Department, currently head of the university's Particle Physics group, ex glider pilot, and lectures particle-astrophysics courses. He teaches physics to first year students at Peterhouse and works on the ATLAS experiment at CERN, looking for exotic states of matter, and has run a number of summer projects connected to ATLAS, for Peterhouse students.

Dr Chris Lester. University Lecturer and Director of Studies (DoS) for "physical" natural scientists at Peterhouse. He usually teaches maths and particle physics to students at Peterhouse. He also works on the ATLAS experiment at CERN, looking for invisible particles that might make up dark matter and supersymmetry. He is occasionally known to lecture from one of his unicycles. Many Peterhouse students have gone on to work in High Energy or Theoretical Physics, and/or have undertaken project work at CERN. Many people who came to Peterhouse to study Natural Sciences intending to specialise in physics end up finding that some other part of Natural Sciences is even more interesting. In the last six years, Peterhouse natural scientists who took physics have gone on work in a huge number of different areas including: management of a multi-billion pound oil refinery; teaching in schools; scientific research from Zoology to History of Science; the priesthood; banking; and management consultancy (to name just a few).

Thank you Peterhouse admission.
Can I take the opportunity to ask whether undergraduates will be offered place to do research at CERN? Will students studying in natural science have the necessary mathematical skills to do research in high energy physics theory? Will the physics department offer mathematical tripos students the chance of doing research on high energy physics at CERN?

I'm afraid I don't know the exact answers to this, but the two Fellows mentioned teach Natural Sciences and not Mathematics. In the first and second years of Natural Sciences there are mathematics courses (compulsory in the first year) to build mathematical understanding and skills. In the fourth year (Part III) of Physics within Natural Sciences there is a specific Particle Physics option. Part III within Natural Sciences also includes a substantial research project within one of the University's research groups.

I think there are some opportunities for summer placements at various laboratories but I'm not sure how these are decided. You might wish to contact the Physics department directly or ask these questions at our open day on the 19th September?

You might be very interested in the Mathematics with Physics option (opens pdf) which allows students to pursue either the Natural Sciences or Mathematics Tripos having spent the first year studying a little of each.