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Article overview
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Forward Neutral Pion Cross Section and Spin Asymmetry Measurements at STAR | | S. Gliske
; J. Drachenberg for the STAR collaboration
; | | Date: |
12 Sep 2013 | | Abstract: | The STAR endcap electromagnetic calorimeter (EEMC) was designed to allow
measurement of cross sections and spin observables in the forward direction, $1
< eta < 2$ and with the full azimuth. Using the EEMC to measure double
longitudinal spin asymmetries in photonic channels---such as inclusive neutral
pions, prompt photon, and prompt photon + jet---allows access to $Delta G$
within a low Bjorken-$x$ region ($0.01 < x < 0.33$ at $sqrt{s}=200$) where
$Delta G$ is poorly constrained. Additionally, transverse spin asymmetries,
shown to be zero at $eta$ near zero and as large as 10\% at $eta$ near 4,
occupy a previously unmeasured region in the 3D pseudorapidity, transverse
momentum, and $x$-Feynman phase space when measured with the EEMC. The neutral
pion cross section measurement verifies that the signal of interest can be
properly reconstructed and isolated from the background. Pion reconstruction
techniques in the STAR EEMC will be discussed and preliminary cross-section and
transverse single spin asymmetry measurements presented. | | Source: | arXiv, 1309.3216 | | Services: | Forum | Review | PDF | Favorites | |
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