Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprx10004p&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
Data obtained in two experiments in Hall A at Jefferson Lab, have demonstrated that the elastic form factor ratio G_Ep/G_Mp decreases linearly with increasing invariant four momentum squared Q^2, starting at 1 GeV^2. The second experiment gave a value of μ_pG_Ep/G_Mp=0.278±0.087 at Q^2=5.6 GeV^2. A third experiment has been approved at JLab; it will extend the Q^2-range to 9 GeV^2. The new experiment will be performed in Hall C, where the High Momentum Spectrometer will be detecting the 5.75 GeV/c recoil proton corresponding to Q^2=9 GeV^2. A recent calibration with polarized protons at the Synchrophasotron in Dubna has shown that the analyzing power of CH2 is still large for 5.75 GeV/c protons. The experiment requires a new focal polarimeter for the HMS, as well as a large calorimeter with good angular resolution to detect the electrons; such a detector is currently being designed. We will present several aspects of the physics investigated and of the instrumentation required for this experiment.
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