Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NLO differential distributions of massive lepton-pair production in
  longitudinally polarized proton-proton collisions   We present the full next-to-leading order (NLO) corrected inclusive cross
section $d^3\Delta \sigma/dQ^2/dy/dp_T$ for massive lepton pair production in
longitudinally polarized proton-proton collisions $p + p\to l^+l^- + 'X'$. Here
$'X'$ denotes any inclusive hadronic state and Q represents the invariant mass
of the lepton pair which has transverse momentum p_T and rapidity y. All QCD
partonic subprocesses have been included provided the lepton pair is created by
a virtual photon, which is a valid approximation for $Q<50{\rm GeV}$. Like in
unpolarized proton-proton scattering the dominant subprocess is given by
$q(\bar q) + g \to \gamma^* + 'X'$ so that massive lepton pair production
provides us with an excellent method to measure the spin density of the gluon.
Our calculations are carried out using the method of n-dimensional
regularization by making a special choice for the $\gamma_5$-matrix. Like in
the case of many other prescriptions evanescent counter terms appear. They are
determined by computing the NLO coefficient functions for $d\Delta\sigma/dQ^2$
and the polarized cross section for Higgs production using both n-dimensional
regularization and a four dimensional regularization technique in which the
$\gamma_5$-matrix is uniquely defined. Our calculations reveal that the
non-singlet polarized coefficient function equals the unpolarized one up to a
minus sign. We give predictions for double longitudinal spin asymmetry
measurements at the RHIC.

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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: econ
4
The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin