Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Measurement of Beauty Photoproduction Through Decays to Muons and Jets
  at HERA-II   The photoproduction of beauty quarks in ep collisions has been measured using
a data sample of 170 pb^-1 collected with the H1 detector at HERA-II in the
years 2006 and 2007. Events with two jets and a muon in the final state were
investigated, and beauty events were identified using the muon's relative
transverse momentum to a jet and its impact parameter. Visible cross sections
were measured differentially in the transverse momenta of the highest energy
jet (p_T^jet1) and the muon (pt_mu), the pseudorapidity of the muon (eta_mu)
and of the photon's momentum fraction x_gamma entering the hard interaction.
The measurements are found to be well described by QCD calculations at NLO.

32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat