FPTLHC

From FLAVOR precision tests to LHC discoveries

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 Obiettivo del progetto (Objective)

'With the rise of the large hadron collider (LHC) experiments the field of particle physics has just entered a new era. On the one hand, the LHC experiments are about to give us information on the origin of electroweak symmetry breaking (EWSB), the EWSB scale-Planck hierarchy and maybe even on the origin of flavor hierarchies. On the other hand, in the last decade huge amount of indirect data from various low energy, precision, experiments was collected. This data, on the possible nature of microscopical dynamics, is invaluable in its power to guide us through our searches for new phenomena at the LHC. Furthermore, once LHC discoveries are made, interpretation of the results will require a synergetic research which combines our understanding of observations at low and high energies. Hence, the interplay between direct and indirect measurements is at the core of this proposal.'

Introduzione (Teaser)

The Large Hadron Collider (LHC) experiment in CERN brought particle physics to the TeV energy frontier, at which some long-lasting questions related to the Standard Model are being answered. But EU-funded physicists had reasons to expect that this is not the complete description of physics at TeV energies.

Descrizione progetto (Article)

The Standard Model describes how a collection of fundamental particles which interact with four forces ( gravity, electromagnetism, the strong and weak force ( makes up everything in our Universe. Developed in the early 1970s, this theory follows from a set of symmetry principles to explain almost every high energy experiment conducted.

To test the Standard Model, precision measurements of the Higgs sector of elementary particles are a major topic in the LHC physics programme. A different aim of these measurements is to search for deviations from the Standard Model predictions. The 'From flavor precision tests to LHC discoveries' (FPTLHC) project team expected that these measurements will herald the existence of new physics.

The effects of such new physics were searched for indirectly through corrections arising from the exchange of new particles. For example, additional Higgs bosons as predicted in supersymmetry, the extension of Standard Model. In particular, low energy measurements based on high-statistics muon, kaon, tau, charm and B-meson production have guided FPTLHC physicists in their search.

In the first reporting period of the FPTLHC project, they have interpreted existing data related to changes in the flavour of particles by the weak force. This is not different in principle from changing their spin by electromagnetic interaction. The absence of deviations from the Standard Model predictions was attributed to a Standard Model-like flavour structure.

In a different approach to the Standard Model-like flavour structure, the FPTLHC scientists assumed that the new physics flavour spectrum is anarchical. This scenario was explored through theoretical models and studies of the possible implications for low energy precision measurements.

However, the interplay of the direct searches with the indirect searches remains to be investigated in the light of new experimental results from the LHC experiments. In particular, with the discovery of a Higgs-like boson after the first LHC results, but no other new particles, the importance of indirect tests could not be stressed more.