Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: K^+\to\pi^+\nu\bar{\nu} with four generations and its effects on
  unitarity triangle   We analyze in the four-generation model the first measurement of the
branching ratio of rare kaon decay K^+\to\pi^+\nu\bar{\nu}, using the
constraints from \Delta m_K, \epsilon_K, B_d-\bar{B_d} mixing, \Gamma (b\to
s\gamma), B_s-\bar{B_s} mixing, D^0-\bar{D^0} mixing,
B(K_L\to\pi^0\nu\bar{\nu}) and B(K_L\to\mu\bar{\mu}), and study its effects on
the unitarity triangle. With the results of searching for the maximum mixing of
the fourth generation, we predict that D^0-\bar{D^0} mixing \Delta m_D and the
branching ratio of "direct" CP-violating decay process K_L\to\pi^0\nu\bar{\nu}
could attain the values 1-2 orders of magnitude larger than the predictions of
the Standard Model.

21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex