CP-FLAVOUR · Study of CP Violation and Flavour Structure as a Probe of Physics beyond the Standard Model
FP6 — Marie Curie Actions (Human Resources and Mobility)
- Duration
- 2006-10-02 → 2008-06-01
- EU contribution
- €148,579
- Participants
- 1
- Scheme
- IIF
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Results in brief
Final Activity Report Summary - CP-FLAVOUR (Study of CP violation and flavour structure as a probe of physics beyond the standard model)
The current centre of interest in particle physics is in the search of new phenomena beyond the standard model (SM). For this purpose, comprehensive efforts have been made both experimentally and theoretically. There are two methodologies aiming at the discovery of those new phenomena, which are equivalently effective (i) direct search at the energy frontier, and (ii) observation of an excessive radiative correction by precision measurements at relatively low energies. This research mainly uses the latter method, namely, the flavour and CP violating phenomena beyond SM, namely in the B physics where a large number of experimental data are available. On the other hand, the biggest discovery of particle physics in recent days is the discovery of the non-zero neutrino mass. This is an indication that the right-handed neutrino exists. Then, it became particularly interesting to consider the proposal that these right-handed neutrinos actually produced the baryon asymmetry in the early universe (leptogenesis scenario). Neutrino physics is also investigated in the research, as is the leptogenesis scenario in the various models beyond SM.
Data: CORDIS, © European Union
Project objective
CP violation and flavour changing phenomena provide an unique window to physics beyond the Standard Model. Our main goal is to extract information about new particles, for instance the super-partners of quarks (squarks) predicted by the super-symmetric ( SUSY) extension of the Standard Model (SM), by fully taking advantage of the data from B meson experiments (Babar, Belle, LHCb). Being the world highest luminosity machines, these experiments are able to observe extremely rare B decays, in which we would search for manifestations of CP and flavour violations not predicted by SM.In SUSY models, extra sources of CP and flavour violation are introduced through SUSY breaking, which explains the large masses of SUSY particles. Our target is to strictly constrain the flavour structure of the down-type squark mass matrix by using data from B meson experiments. We will proceed our project providing high precision theoretical predictions for B decays, which is most important since new physics effects can be extremely small.The largest difficulties for this purpose come from strong interaction effects, requiring various techniques in quantum chromo-dynamics (QCD). We will carefully incorporate their latest developments, such as QCD factorisation, perturbative QCD method, QCD sum-rule and large Nc expansion (Nc being the number of colours). Actually, CP violation and flavour structure are also intensively studied in the neutrino sector, triggered by the confirmation of massive neutrinos by SuperKamiokande and SNO experiments.It has recently been shown that the observed third and second-generation neutrino oscillations can have an impact on the same generation quarks (bottom to strange) transition, in the framework of SUSY Grand Unified Theory (GUT). We are therefore interested in comparing our results from B physics with SUSY GUT models well motivated by neutrino physics and its implication for Cosmology.
Original text from CORDIS.
Participants
- UNIVERSITé PARIS SUD · ORSAY CEDEXCoordinatorCity levelFrance
Links
Data: CORDIS, © European Union