Theoretical studies
Theoretical studies
Phenomenological studies include the following working groups:
WG2: Precision Electroweak calculations
WG5: Rare decays and search for new physics
WGs 3, 4, 5, are merged with experimental WGs 5, 6, and 7.
The main objective of this Working Group is to propose and interpret theoretical models beyond the Standard Model that can be probed at TLEP, e.g., within the general frameworks of supersymmetry and composite models. A key output of this group will be to set figure-of-merit targets that will enable the experiments to distinguish between competing scenarios. This group will interact with the experimental Working Groups 1 to 7, in particular.
This working group has three main objectives: (i) to survey and codify the current status of precision electroweak calculations for Z, W, H and top physics, (ii) identify the further calculations needed to reach similar precision to the expected experimental accuracy, and (iii) provide a programmatic framework for initiating these calculations, whose completion will require many years of dedicated effort by the world's experts. This Working Group will liaise closely with the experimental Working Groups 1 to 4, in particular. Many of the theoretical calculations will be required also for linear collider studies, and we will seek to establish a joint collaborative framework.
This Working Group will work jointly with Exp/WG5. It will study in an integrated framework the information that TLEP could extract from top studies, b, c and τ physics, and rare decays. Therefore it will liaise closely with the experimental Working Groups 4 and 7. The huge samples of heavy flavours produced under clean conditions will provide unprecedented sensitivity in the search for new Physics beyond the CKM paradigm.
This Working Group will work jointly with Exp/WG6, and will develop QCD predictions both for their intrinsic interest, e.g., for jet and fragmentation studies, measuring αs and testing theoretical predictions for γγ physics, and in view of their importance for attaining the desired precision objectives in other TLEP studies. The work programme of this group will include both novel higher-order perturbative QCD calculations and a new generation of event simulations. Thus this group will liaise with the experimental Working Groups 1, 2, 3 and 5.
This group will work jointly with Exp/WG7. With almost a trillion Z, 100 million W, 2 million Higgs bosons, and 2 million top quarks, searches for rare decays are an important part of the scientific programme of TLEP. The mandate of the group is to evaluate the potential of TLEP in this respect, as well as that of the specific searches for rare or new physics (e.g., dark matter detection through ISR, search for effects of heavy neutrinos, effects of possible new resonances, etc.). The complementarity with hadron colliders is to be reviewed by the group.
This Working Group will examine the value that TLEP can add to global fits to the parameters of the Standard Model and possible extensions, taking into account prospective measurements at the LHC (including its high-luminosity upgrade), also in the context of other planned and possible accelerators such as the ILC and a higher-energy collider in the same tunnel (VHE-LHC). It will liaise with theoretical Working Groups 1 and 2 and with experimental Working Groups 1 to 4.
