Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: From identical S- and P-wave pT/M spectra to maximally distinct
  polarizations: probing NRQCD with chi states   A global analysis of ATLAS and CMS measurements reveals that, at
mid-rapidity, the directly-produced $\chi_{c1}$, $\chi_{c2}$ and J/$\psi$
mesons have differential cross sections of seemingly identical shapes, when
presented as a function of the mass-rescaled transverse momentum, $p_{\rm
T}/M$. This identity of kinematic behaviours among S- and P-wave quarkonia is
certainly not a natural expectation of non-relativistic QCD (NRQCD), where each
quarkonium state is supposed to reflect a specific family of elementary
production processes, of significantly different $p_{\rm T}$-differential cross
sections. Remarkably, accurate kinematic cancellations among the variegated
NRQCD terms (colour singlets and octets) of its factorization expansion can
lead to a surprisingly good description of the data. This peculiar tuning of
the NRQCD mixtures leads to a clear prediction regarding the $\chi_{c1}$ and
$\chi_{c2}$ polarizations, the only observables not yet measured: they should
be almost maximally different from one another, and from the J/$\psi$
polarization, a striking exception in the global panorama of quarkonium
production. Measurements of the difference between the $\chi_{c1}$, $\chi_{c2}$
and J/$\psi$ polarizations, complementing the observed identity of momentum
dependences, represent a decisive probe of NRQCD.

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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat