28 research outputs found
On transverse single-spin asymmetries in -meson production at the SPD NICA experiment
In the present study we are interested in the Sivers effect in process
. We calculate the transverse single-spin asymmetry (TSSA)
of -meson production within two phenomenological models, namely the
Generalized Parton Model (GPM) and it's Colour Gauge-Invariant formulation
(CGI-GPM), which takes into account the transverse momenta of initial partons.
The last one allows us to study process-independent Sivers functions. To
predict production cross-section of -mesons we use a fragmentation approach
with scale-independent Peterson fragmentation function, taking in mind nonzero
masses of -quark and -mesons. Estimates for the TSSAs, as a function of
transverse momentum and Feynman variable of -meson, within the
conditions of the planned SPD NICA experiment are presented for the first time.Comment: 6 pages, 3 figures, Talk at the International Conference on Quantum
Field Theory, High-Energy Physics, and Cosmology, 18-21 June 2022 BLTP, JIN
Open charm production in the parton Reggeization approach: from Tevatron to LHC
We study the inclusive hadroproduction of D^0, D^+, D^star+, and D_s^+ mesons
at leading order in the parton Reggeization approach endowed with universal
fragmentation functions fitted to annihilation data from CERN LEP1. We
have described -meson transverse momentum distributions measured in the
central region of rapidity by the CDF Collaboration at Tevatron (|y|<1) and
ALICE Collaboration at LHC (|y|<0.5) within uncertainties and without free
parameters, using Kimber-Martin-Ryskin unintegrated gluon distribution function
in a proton. The forward D-meson production (|y|>2.0) measured by the LHCb
Collaboration also has been studied and expected disagreement between our
theoretical predictions and data has been obtained.Comment: 16 pages, 12 figure
B-meson production in the Parton Reggeization Approach at Tevatron and the LHC
We study the inclusive hadroproduction of , , and mesons at
leading order in the parton Reggeization approach using the universal
fragmentation functions extracted from the combined annihilation data
from CERN LEP1 and SLAC SLC colliders. We have described -meson transverse
momentum distributions measured in the central region of rapidity by the CDF
Collaboration at Fermilab Tevatron and CMS Collaboration at LHC within
uncertainties and without free parameters, applying Kimber-Martin-Ryskin
unintegrated gluon distribution function in a proton. The forward -meson
production () measured by the LHCb Collaboration also has been
studied and expected disagreement between our theoretical predictions and data
has been obtained.Comment: 17 pages, 11 figures. arXiv admin note: substantial text overlap with
arXiv:1410.713
Probing Gluons at the Spin Physics Detector
The Spin Physics Detector (SPD) at the Nuclotron based Ion Collider fAcility
(NICA) is a multi-purpose experiment designed to study nucleon spin structure
in the three dimensions. With capabilities to collide polarized protons and
deuterons with center of mass energy up to 27 GeV and luminosity up to for protons (an order of magnitude less for deuterons),
the experiment will allow measurements of cross-sections and spin asymmetries
of hadronic processes sensitive to the unpolarized and various polarized
(helicity, Sivers, Boer-Mulders) gluon distributions inside the nucleons.
Results from the SPD will be complementary to the present high energy spin
experiments at the RHIC facility or future experiments like the EIC (at BNL)
and AFTER (at LHC). SPD will provide data in moderate and large Bjorken-x for
much improved global analyses of spin structures of the basic building blocks
of Nature. With polarized deuteron collisions, SPD will be the unique
laboratory for probing tensor polarized gluon distributions. In addition, there
are also possibilities of colliding other light nuclei like Carbon at reduced
collision energy and luminosity at the first stage of the experiment.Comment: Accepted for publication in MDPI Physics special issue `From Heavy
Ions to Astroparticle Physics