BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:The double longitudinal-spin asymmetry in the neutral pion product
 ion
DTSTART;VALUE=DATE-TIME:20261030T093000Z
DTEND;VALUE=DATE-TIME:20261030T094500Z
DTSTAMP;VALUE=DATE-TIME:20261104T183849Z
UID:indico-contribution-6168@cern.ch
DESCRIPTION:Speakers: Vladislav Bondarev (Самарский национ
 альный исследовательский университет и
 мени академика С.П. Королева)\nWe studied the produ
 ction of an inclusive $\\pi^0$ meson within the kinematic range\,\nrelevan
 t to the RHIC and the LHC colliders. We calculated the double longitudinal
 -spin asymmetry (DLSA)\n$\nA_{LL} =\n\\frac{d\\sigma^{++} - d\\sigma^{+-}}
 \n     {d\\sigma^{++} + d\\sigma^{+-}}\n$\nfor the production of neutral p
 ions in $pp$-collisions. This observable\nprovides reliable information on
  the spin-dependent gluon distribution functions of the polarized\nproton.
  For this study we used well-known helicity matrix elements obtained in th
 e collinear parton model at leading order in the strong coupling constant 
 [Babcock\, Monsay\, Sivers\, 1979]. The formation of pions\nwas described 
 by two different sets of fragmentation functions: Kniehl-Kramer-Potter [Kn
 iehl\, Kramer\, Pötter\, 2001]\nand NNFF1.0 [Bertone\, Carrazza\, Hartlan
 d\, Nocera\, Rojo\, 2017]. The results were compared with data from the PH
 ENIX and STAR collaboration at RHIC.\nFinally\, we provided predictions of
  the DLSA for the planned SPD experiment at NICA to estimate the expected 
 magnitude of this quantity. The predictions for the $A_{LL}$ have been don
 e recently for charmonium [Karpishkov\, Saleev\, 2026] and direct photon [
 Saleev\, Shipilova\, 2023]\n\nhttps://indico.particle.mephi.ru/event/626/c
 ontributions/6168/
LOCATION: Conference Hall 3
URL:https://indico.particle.mephi.ru/event/626/contributions/6168/
END:VEVENT
END:VCALENDAR