[ Department of Theoretical Physics ]

Weak decays and CP-symmetry violation

Prof. Nello Paver, Full Professor


This kind of research concerns the physical effects of non-standard interactions among the elementary matter constituents (leptons and quarks) at the very high energies foreseen for the linear electron-positron collider. It is carried out in the framework of the International Study Group for the physics programme at this accelerator. In particular, the process under consideration has been so far the annihilation into fermion-antifermion pairs, with the goal to formulate observables suitable for a model independent analysis and identification of the possible sources of the new effects, and for the extraction of the information on the new couplings constants from the experimental data. In this regard, as shown in the application to the search of 4-fermion contact interactions, longitudinal polarization of electron and positron beams has a fundamental role, in order to significantly increase the "discovery reach" of the collider and disentangle the components with different chirality. The analysis accounts for radiative effects, computed by the most recent numerical codes, and the foreseen experimental statistical and systematic uncertainties including their correlations.


The topic studied in this kind of activity is the heavy meson (B, D) non-leptonic weak decays into three-body hadronic final states, both CP-conserving and CP-violating ones. One the one side, attention is paid to the analyses of data relevant to B-meson decay processes measured by the BaBar experiment at SLAC (Stanford). On the other side, spectroscopical aspects of three-body decays of D-mesons have been investigated, emphasizing the potential presence of a strong source of long-distance effects in hadronic channels including scalar-isoscalar mesons not taken into account in previous theoretical analyses.


Author: G. Pastore
Updated :
URL: http://www-dft.ts.infn.it