Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at √ s = 200 GeV (2013)
- Authors:
- USP affiliated authors: MUNHOZ, MARCELO GAMEIRO - IF ; SUAIDE, ALEXANDRE ALARCON DO PASSO - IF ; TOLEDO, ALEJANDRO SZANTO DE - IF
- Unidade: IF
- Assunto: COLISÕES DE ÍONS PESADOS RELATIVÍSTICOS
- Language: Inglês
- Abstract: The differential cross section and spin asymmetries for neutral pions produced within the intermediate pseudorapidity range 0.8 < η < 2.0 in polarized proton-proton collisions at √ s = 200 GeVare presented. Neutral pions were detected using the endcap electromagnetic calorimeter in the STAR detector at RHIC. The cross section was measured over a transverse momentum range of 5 < pT < 16 GeV/c and is found to agree with a next-to-leading order perturbative QCD calculation. The longitudinal double-spin asymmetry, ALL, is measured in the same pseudorapidity range and spans a range of Bjorken-x down to x ≈ 0.01. The measured ALL is consistent with model predictions for varying degrees of gluon polarization. The parity-violating asymmetry, AL, is also measured and found to be consistent with zero. The transverse single-spin asymmetry, AN, is measured over a previously unexplored kinematic range in Feynman-x and pT . Such measurements may aid our understanding of the on-set and kinematic dependence of the large asymmetries observed at more forward pseudorapidity (η ≈ 3) and their underlying mechanisms. The AN results presented are consistent with a twist-3 model prediction of a small asymmetry over the present kinematic range.
- Imprenta:
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ABNT
ADAMCZYK, L; LIMA, Lucas Mafia de; MUNHOZ, Marcelo Gameiro; et al. Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at √ s = 200 GeV. [S.l: s.n.], 2013. -
APA
Adamczyk, L., Lima, L. M. de, Munhoz, M. G., Oliveira, R. A. N. de, Souza, U. G. de, Suaide, A. A. do P., & Szanto de Toledo, A. (2013). Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at √ s = 200 GeV. São Paulo. -
NLM
Adamczyk L, Lima LM de, Munhoz MG, Oliveira RAN de, Souza UG de, Suaide AA do P, Szanto de Toledo A. Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at √ s = 200 GeV. 2013 ; -
Vancouver
Adamczyk L, Lima LM de, Munhoz MG, Oliveira RAN de, Souza UG de, Suaide AA do P, Szanto de Toledo A. Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at √ s = 200 GeV. 2013 ; - Pion interferometry in Au+Au collisions at ''S IND.NN' POT. 1/2 '= 200 GeV'
- Local polarimetry for proton beams with the STAR beam beam counters
- Measurement of the double longitudinal spin asymmetry in inclusive jet production in polarized p+p collisions at sqrt(s) = 200 GeV
- Centrality dependence of heavy flavor production from single electron measurement in ''S IND.NN' POT. 1/2 '= 200 GeV' Au + Au collisions
- System and energy dependence of strangeness production with STAR
- A heavy-flavor tracker for STAR
- Distributions of charged hadrons associated with high transverse momentum particles in pp and Au + Au collision at ""ANTPOT.S NN" POT..1/2" = 200 GeV
- Multiplicity and pseudorapidity distributions of charged particles and photons at forward pseudorapidity in Au + Au collisions at sqrt{s_NN} = 62.4 Gev
- Non-gaussian effects in identical pion correlation function at STAR
- Pion interferemetry from p+p to Au+Au in STAR
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