Precision Electroweak Physics at the LHC

par Mieczyslaw Witold Krasny (LPNHE & CERN)

vendredi 11 déc. 2009, 14:00 → 15:00 Europe/Paris

Auditorium M. Vivargent (LAPTH)

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 elaborated 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 and analysis strategies must be developed. Two examples of such strategies will be presented and evaluated. The first one circumvents 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 using the CERN high-intensity muon beam and optimized to provide the necessary experimental input for precision control of the polarization of the W and Z bosons produced at the LHC. The Letter Of Intent for such an experiment has just been submitted to the SPSC and the LHCC.

Slides krasny11122009.pdf