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 et al. Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at √ s = 200 GeV. . São Paulo: Instituto de Física, Universidade de São Paulo. Disponível em: http://lanl.arxiv.org/pdf/1309.1800v2.pdf. Acesso em: 24 abr. 2024. , 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: Instituto de Física, Universidade de São Paulo. Recuperado de http://lanl.arxiv.org/pdf/1309.1800v2.pdf -
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 [Internet]. 2013 ;[citado 2024 abr. 24 ] Available from: http://lanl.arxiv.org/pdf/1309.1800v2.pdf -
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 [Internet]. 2013 ;[citado 2024 abr. 24 ] Available from: http://lanl.arxiv.org/pdf/1309.1800v2.pdf - Neutral pion production in d-Au collisions at ''S IND.NN' POT. 1/2 '= 200 GeV'
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- Transverse-momentum $p_t$ correlations on $(\eta, \phi)$ from mean-$p_{t}$ fluctuations in Au-Au collisions at $\sqrt{s_{NN}} = $ 200 GeV
- AA versus pp and dA: A puzzling scaling in HBT@RHIC
- High transverse momentum Xi baryon correlations in p+p collisions at s^(1/2)=200 GeV
- Charged kaon results from dAu and pp collisions at 's ANTIPOT. NN''POT. 1/2' = 200 GeV
- The geometry of hadronization in Au+Au collisions at 'ANTIPOT. s NN''POT. 1/2' = 130 and 200 GeV studied with charge-dependent, two-particle number fluctuations and correlations
- Quantum interference in ''rô'GRAUS' production in ultra-peripheral heavy ion collisions
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