Precision determination of pion mass using x-ray CCD spectroscopy

Details Precision determination of pion mass using x-ray CCD spectroscopy Precision determination of pion mass using x-ray CCD spectroscopy

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3443...32a&link_type=abstract

Proc. SPIE Vol. 3443, p. 32-38, X-Ray and Ultraviolet Spectroscopy and Polarimetry II, Silvano Fineschi; Ed.

Physics

Scientific paper

An experiment is described which aims to determine the pion mass to 1 ppm or better, from which a new determination of the upper limit of the muon neutrino mass is anticipated. The approach utilizes spectroscopy of X-ray emissions from pionic atoms formed in gaseous targets. The spectroscopy is performed with a Bragg crystal spectrometer, with an energy resolution of approximately 300 meV, using an array of X-ray CCDs mounted at the focus to measure the spectral line structure of the 4 keV pionic nitrogen transition. To achieve sub-ppm accuracy, as energy calibration a muonic oxygen transition is used. It is known with a precision of 0.3 ppm and almost coincides in energy with the pionic transition.

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