Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: FCC-ee: Energy calibration   The FCC-ee aims to improve on electroweak precision measurements, with goals
of 100 keV on the Z mass and width, and a fraction of MeV on the W mass.
Compared to LEP, this implies a much improved knowledge of the centre-of-mass
energy when operating at the Z peak and WW threshold. This can be achieved by
making systematic use of resonant depolarization. A number of issues have been
identified, due in particular to the long polarization times. However the
smaller emittance and energy spread of FCC-ee with respect to LEP should help
achieve a much improved performance.

21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
2
The categories of this paper are: math
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The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th