Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Disk Scattering of Open and Closed Strings (I)   At the tree level, the scattering processes involving open and closed strings
are described by a disk world-sheet with vertex operator insertions at the
boundary and in the bulk. Such amplitudes can be decomposed as certain linear
combinations of pure open string amplitudes. While previous relations have been
established on the double cover (complex sphere) in this letter we derive them
on the disk (upper complex half plane) allowing for different momenta of the
left- and right-movers of the closed string. Formally, the computation of disk
amplitudes involving both open and closed strings is reduced to considering the
monodromies on the underlying string world-sheet.

26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ