Perspectives and Challenges for the Precision Measurement Programme at the LHC par M.W. Krasny (LPNHEP)

Monday 19 Oct 2009, 11:00 → 12:00 Europe/Paris

salle 9 (LPSC)

It is both surprising and difficult to admit that, following 15 years of preparation of the LHC experimental programme, we do not have a viable strategy to improve the measurement precision of the Standard Model parameters at the LHC. Several measurement methods have been proposed and extensively discussed over the last decade by the ATLAS and CMS collaborations. However, in all the proposed methods several shortcuts have been made. In my talk I shall demonstrate that these shortcuts were justified for the Tevatron $\ppbar$ collisions but are no longer justified for the $\pp$ collisions at the LHC. I shall argue that in order to go forward novel LHC-specific measurement strategies must be developed. Two examples of such strategies will be presented and evaluated. The first one proposes to circumvent the LHC-specific precision brick-walls by complementing the standard LHC pp colliding mode with the dedicated runs with deuteron or helium beams. The core of the second, alternative one, is a dedicated fixed target ``LHC-support'' experiment with high-intensity muon beam capable to improve the understanding of the polarization of the W and Z bosons produced at the LHC. The LOI for such an experiment has just been submitted to SPSC.