Constraining δG at Low-x with Double Longitudinal Spin Asymmetries of Hadrons at Forward Rapidity in PHENIX

Details Constraining δG at Low-x with Double Longitudinal Spin Asymmetries of Hadrons at Forward Rapidity in PHENIX Constraining δG at Low-x with Double Longitudinal Spin Asymmetries of Hadrons at Forward Rapidity in PHENIX

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprl11006w&link_type=abstract

American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #L11.006

Computer Science

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At low Bjorken-x, x<0.05, the proton structure is heavily gluon dominated. However, in this kinematic region, the gluon polarization, δG, and hence its contribution to the net proton spin, remains weakly constrained. To map out the gluon polarization at low-x and distinguish between various theoretical models with the best sensitivity, it is necessary to measure the asymmetry, ALL, in high pT hadrons in the forward direction (3.1<|η|<3.9) from longitudinally polarized protons. We will report the current status of the single 0̂ measurements. In addition, we have upgraded the electronics and triggering of our forward calorimeter to be able to trigger on di-hadron events as well. The new trigger will be used first during the 2012 RHIC run. This measurement is particularly interesting because it provides the best sensitivity to low-x gluons, with x˜ few x10-3, that participate in highly asymmetric interactions. We will report on the performance of our new trigger as the run in progress continues. Both the single and di-hadron measurements will provide valuable low-x input for future global analyses of δG.

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