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Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at root s=510 GeV

Author
Adamczyk L. AGH University of Science and Technology, Poland
Lednický Richard, promovaný fyzik DrSc. dr. h. c. Institute of physics of the ASCR, JINR Dubna
et al.  different institutions

Year
2019

Scientific journal
PHYSICAL REVIEW D 99 (5) 051102

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Abstract
We report new STAR measurements of the single-spin asymmetries A(L) for W+ and W- bosons produced in polarized proton-proton collisions at root s = 510 GeV as a function of the decay-positron and decay-electron pseudorapidity. The data were obtained in 2013 and correspond to an integrated luminosity of 250 pb(-1). The results are combined with previous results obtained with 86 pb(-1). A comparison with theoretical expectations based on polarized lepton-nucleon deep-inelastic scattering and prior polarized proton-proton data suggests a difference between the (u) over bar and (b) over bar quark helicity distributions for 0.05 < x < 0.25. In addition, we report new results for the double-spin asymmetries A(LL) for W-+/-, as well as A(L) for Z/gamma* production and subsequent decay into electron-positron pairs.

Cite article as:
L. Adamczyk, R. Lednický, . et al., " Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at root s=510 GeV ", PHYSICAL REVIEW D 99 (5) 051102 (2019)