Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing unparticle theory via lepton flavor violating process $J/\psi\to
  ll'$ at BESIII   The lepton flavor violating process $J/\psi\to ll' (l\neq l')$ serves as an
ideal place to probe the unparticle theory. Such process can only occur at loop
level in the Standard model (SM), so that should be very suppressed, by
contrast in unparticle scenario, it happens at tree level and its contribution
may be sizable for practical measurement. Moreover, the BESIII will offer the
largest database on $J/\psi$ which makes more accurate measurements possible.
Furthermore, for such purely leptonic decays background is relatively low and
signal would be cleaner. Our work carefully investigates the possibility of
observing such processes from both theoretical and experimental aspects.

25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
2
The categories of this paper are: math