Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three Point Tree Level Amplitude in Superstring Theory   In order to check the definite amplitude and the exact zero result of the
amplitude of three massless points $(CAA)$ in both string theory and field
theory side for $p=n$ case and to find all gauge field couplings to R-R closed
string, we investigate the disk level S-matrix element of one Ramond-Ramond
field and two gauge field vertex operators in the world volume of BPS branes.

2
The categories of this paper are: math
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph