Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Opposite-side flavour tagging of B mesons at the LHCb experiment   The calibration and performance of the opposite-side flavour tagging
algorithms used for the measurements of time-dependent asymmetries at the LHCb
experiment are described. The algorithms have been developed using simulated
events and optimized and calibrated with B+ -> J/psi K+, B0 -> J/psi K*0 and B0
-> D*- mu+ nu_mu decay modes with 0.37 fb^-1 of data collected in pp collisions
at sqrt(s) = 7 TeV during the 2011 physics run. The opposite-side tagging power
is determined in the B+ -> J/psi K+ channel to be (2.10 +- 0.08 +- 0.24) %,
where the first uncertainty is statistical and the second is systematic.

24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph