Measurement of the Transverse Single Spin Asymmetry of $p$ + $p^\uparrow$ $\rightarrow$ $η$ + $X$ at $\sqrt{s}$ = 200 GeV

Details Measurement of the Transverse Single Spin Asymmetry of $p$ + $p^\uparrow$ $\rightarrow$ $η$ + $X$ at $\sqrt{s}$ = 200 GeV Measurement of the Transverse Single Spin Asymmetry of $p$ + $p^\uparrow$ $\rightarrow$ $η$ + $X$ at $\sqrt{s}$ = 200 GeV

2012-02-15

arxiv.org/abs/1202.3354v1

Journal of Physics: Conference Series, Volume 295 012085 (2011)

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures

Scientific paper

10.1088/1742-6596/295/1/012085

The measurement of transverse single spin asymmetries ($A_N$) provides insight into the structure of the nucleon. Several mechanisms have been proposed that attempt to explain $A_N$ based on QCD, and additional measurements of $A_N$ for different processes further constrain these models. Using the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC), we study transversely polarized p+p collisions. Results from PHENIX and other experiments show significant asymmetries in the forward region, which could be due to contributions from both the Sivers and the Collins effects. Studying the species as well as the kinematic dependencies of these transverse single spin asymmetries will help to disentangle the origin of the observed asymmetries. Therefore, measurements of $A_N$ with inclusive $\eta$ mesons at forward rapidities are an important tool for the understanding of these asymmetries. In 2008, the PHENIX experiment collected 5.2 pb$^{-1}$ integrated luminosity in $p^\uparrow+p$ collisions at $\sqrt{s}$ = 200 GeV. The status of the asymmetry analysis of $\eta$ mesons at forward rapidity will be shown.

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