References - Bogoliubov Laboratory of Theoretical Physics - JINR

MN 0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.1
-0.12
-0.6 -0.4 -0.2 0 0.2 0.4 0.6
xp-x
T
q
sin( φ+
φ )
S
AUT
2
2
2 11 GeV 2 . Cut 2 11 GeV 2 is also applied to avoid the lepton
pairs coming from J/ψ region. We choose NICA experimental conditions (proton-proton
collider with s = 400 GeV 2 ).
The results are presented in Fig. 1 and 2. From these figures one can see that the
reconstructed from the simulated data asymmetry is in very good agreement with the
respective values calculated directly from the parametrization (solid line) for both types
of single-spin asymmetries. We performed also a large number of another statistical tests
which proved the generator to be working perfectly.
In summary, new generator of polarized DY events was developed which allow to
estimate the feasibility of both weighted with sin(φ − φS) and sin(φ + φS) single-spin
asymmetries is constructed. The performance of the generator essentially increased in
comparison with the preceding generator [3]. The generator was successfully tested and
now it applied in a lot of physical applications. For example, the estimations performed
for proton-proton collisions demonstrate that the single-spin asymmetries are presumably
measurable even at the applied statistics 50K pure Drell-Yan events. While A sin(φ−φS) qT MN
UT
is presumably measurable in both kinematical regions xp >xp↑ and xp