Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing Flavor Changing Neutral Higgs Couplings at LHC   Uniquely heavy with mass at the weak scale, the top quark may have large
flavor changing couplings to Higgs bosons that are as yet unexplored. We show
that such couplings can be directly probed at the LHC through the parton
subprocess $c(\bar c)g \to t (\bar t)A^0$, where the pseudoscalar $A^0$
subsequently decays into $t \bar c$ or ${\bar t} c$, giving rise to the
intriguing final state of like sign top quark pairs. After demanding
$\ell^\pm\ell^\pm$, missing energy and two $b$-jets, the major background turns
out to be $q\bar q' \to Wt \bar t$, which can be partially suppressed by jet
counting. The signal can then manifest itself in the asymmetry of numbers of
$\ell^+\ell^+$ and $\ell^-\ell^-$ events. To further improve the signal over
background, efficient $t$ vs. $\bar t$ tagging methods should be developed.

16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph