Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recent results of gluon and sea quark polarization measurements in
  polarized proton-proton collisions at STAR   The STAR experiment at RHIC is carrying out a comprehensive high-energy spin
physics program to understand the internal structure and dynamics of the proton
in polarized proton-proton collisions at $\sqrt{s} = 200$ GeV and $\sqrt{s} =
500/510$ GeV. STAR has the capability, with nearly full azimuthal coverage, to
reconstruct leptons, hadrons and jets in the mid-rapidity region ($|\eta|<1$).
The results for inclusive jet longitudinal double spin asymmetries taken during
the 2009 RHIC run indicate the first non-zero gluon contribution ($\Delta
g(x,Q^{2}) / g(x,Q^{2})$) to the proton spin for $0.05<x<1$ (Bjorken-x:
momentum fraction of partons). Recent longitudinal single-spin asymmetry
measurements of $W^{+/-}$ bosons at $\sqrt{s} = 500/510$ GeV in polarized
proton-proton collisions provide a direct probe of the polarized anti-u and
anti-d quark distributions ($\Delta \bar{u}(x,Q^{2})$, $\Delta
\bar{d}(x,Q^{2})$). These results better constrain the polarized gluon and sea
quark distributions of the proton in the RHIC sensitive kinematic region.
Future measurements with continuing high energy polarized proton-proton run at
RHIC and detector upgrade will explore the gluonic contribution to the proton
spin in extended range.

22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph