Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deuteron polarizations in the proton-deuteron Drell-Yan process for
  finding the gluon transversity   The gluon transversity distribution in the deuteron is defined by the matrix
element between linearly-polarized deuteron states, and it could be
investigated in proton-deuteron collisions in addition to lepton-deuteron
scattering. The linear polarization of photon is often used, whereas it is
rarely used for the spin-1 deuteron. Therefore, it is desirable to express
deuteron-reaction cross sections in term of conventional deuteron spin
polarizations for actual experimental measurements. In this work, we
investigate how proton-deuteron Drell-Yan cross sections are expressed by the
conventional polarizations for finding the gluon transversity distribution. In
particular, we show that the gluon transversity can be measured in the
proton-deuteron Drell-Yan process by taking the cross-section difference
between the deuteron spin polarizations along the two-transverse axes. Since
the gluon transversity does not exist for the spin-1/2 nucleons, a finite gluon
transversity of the deuteron could indicate an "exotic" mechanism beyond the
simple bound system of the nucleons in the deuteron. Therefore, the gluon
transversity is an interesting and appropriate observable to shed light on a
new hadronic mechanism in nuclei.

31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg