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Committee for collaboration of Czech Republic

with Joint Institute for Nuclear Research in Dubna Login
Longitudinal double-spin asymmetries for pi(0)s in the forward direction for 510 GeV polarized pp collisions

Author
Adam J. Creighton University, Omaha
Lednický Richard, promovaný fyzik DrSc. dr. h. c. Institute of physics of the ASCR, JINR Dubna
et al.  STAR collaboration

Year
2018

Scientific journal
Physical Review D, 98 (3), 032013

Web


Abstract
The STAR Collaboration reports measurements of the longitudinal double-spin asymmetry, A(LL), for neutral pions produced at forward directions in polarized proton-proton collisions, at a center-of-mass energy of 510 GeV. Results are given for transverse momenta in the range 2 < p(T) < 10 GeV= c within two regions of pseudorapidity that span 2.65 < eta < 3.9. These results are sensitive to the polarized gluon parton distribution function, Delta g(chi) down to the region of Bjorken x similar to 10(-3). The asymmetries observed are less than similar to 5 x 10(-3) in magnitude and will help constrain the contribution to the spin of the proton from polarized gluons at low x, when combined with other measurements as part of a global analysis.

Cite article as:
J. Adam, R. Lednický, . et al., "Longitudinal double-spin asymmetries for pi(0)s in the forward direction for 510 GeV polarized pp collisions", Physical Review D, 98 (3), 032013 (2018)