A Measurement of the CMB <EE> Spectrum from the 2003 Flight

We report measurements of the CMB polarization power spectra from the 2003 January Antarctic flight of
BOOMERANG. The primary results come from 6 days of observation of a patch covering 0.22% of the sky centered
near R:A: ¼ 82N5, decl: ¼ 45 . The observations were made using four pairs of polarization-sensitive bolometers
operating in bands centered at 145 GHz. Using two independent analysis pipelines, we measure a nonzero hEEi signal
in the range 201 < l < 1000 with a significance of 4.8 , a 2 upper limit of 8.6 K2 for any hBBi contribution,
and a 2 upper limit of 7.0 K2 for the hEBi spectrum. Estimates of foreground intensity fluctuations and the nondetection
of hBBi and hEBi signals rule out any significant contribution from Galactic foregrounds. The results are
consistent with a CDM cosmology seeded by adiabatic perturbations.We note that this is the first detection of CMB
polarization with bolometric detectors.

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