Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Flavour violation in general supergravity   We reappraise the flavour changing neutral currents (FCNC) problem in
string--derived supergravity models. We overview and classify possible sources
of flavour violation and find that the problem often does not arise in classes
of models which generate hierarchical Yukawa matrices. In such models,
constraints from the K- and D-meson systems leave room for substantial flavour
non-universality of the soft terms. The current B-physics experiments only
begin to probe its natural range. Correlations among different observables can
allow one to read off the chirality structure of flavour violating sources. We
briefly discuss the lepton sector where the problem of FCNC is indeed serious
and perhaps points at an additional symmetry or flavour universality.

23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin