A Measurement of the Polarization‐Temperature Angular Cross‐Power Spectrum of the Cosmic Microwave Background from the 2003 Flight of BOOMERANG

We present a measurement of the temperature-polarization angular cross power spectrum, , of the Cosmic Microwave Background. The result is based on \ 200 hours of data from 8 polarization sensitive bolometers operating at 145 GHz during the 2003 flight of BOOMERANG. We detect a significant correlation in the \-range between 50 and 950 with a statistical significance > 3. 5 sigma. Contamination by polarized foreground emission and systematic effects are negligible in comparison with statistical uncertainty. The spectrum is consistent with previous detections and with the "concordance model" that assumes adiabatic initial conditions. This is the first measurement of using bolometric detectors.