Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Open Charm measurements at the NA61 experiment at CERN SPS   The strong interactions programme of the NA61/SHINE experiment at CERN SPS
has been extended through the use of new silicon Vertex Detector which provides
precise measurements of exotic particles with short lifetime. The detector was
designed to meet the challenges of primary and secondary vertexes
reconstruction at high spatial resolution. An initial version of the Vertex
Detector called SAVD (Small Acceptance Vertex Detector) was installed last end
of 2016, and data was from Pb+Pb collisions was collected in 2016, for Xe+La in
2017, as well as further Pb+Pb collisions this year. First indication of a
D$^0$ peak at SPS energies has been observed. The physics motivation behind the
open charm measurements will be discussed, as well as the analysis of collected
data on open charm production and the future plans of open charm measurements
in NA61/SHINE experiment related to the upgraded version of the vertex
detector.

23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph