### Session K16: Sub-Nucleonic Degrees of Freedom I

1:15 PM–3:03 PM, Sunday, April 15, 2007
Hyatt Regency Jacksonville Riverfront Room: City Terrace 12

Chair: Thomas Ulrlich, Brookhaven National Laboratory

Abstract ID: BAPS.2007.APR.K16.5

### Abstract: K16.00005 : Longitudinal Double Spin Asymmetry for inclusive back-to-back dimuons in polarized $p$+$p$ collisions at $\sqrt{s} = 200$ GeV

2:03 PM–2:15 PM

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#### Author:

Carlos Munoz Camacho
(Los Alamos National Laboratory)

Longitudinal double spin asymmetries, $A_{LL}$, measured for hard inclusive processes (open charm, open beauty) in polarized proton-proton collisions at high energies are sensitive to the gluon polarization, $\Delta g/g$. By measuring large invariant mass muon pairs, $\Delta g/g$ is probed in the interesting region of momentum fraction $0.02\alt x \alt 0.1$, where $\Delta g/g$ is expected to be significant. The PHENIX forward spectrometers have been used to measure back-to-back muon pairs. The status of the analysis of $A_{LL}$ in polarized $p$+$p$ collisions at $\sqrt{s}=200$ GeV at RHIC will be presented.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.APR.K16.5