A Measurement of the Mass, Full Width and Radiative Width of the $B^+$ (1237) Meson
B. Collick · 1984
An experiment was performed at Fermi National Accelorater - Laboratory to investigate the coherent production of mesons on nuclear targets (lead and copper). The experiment used and 200 GeV/c incident - meson beam and a high resolution forward spectrometer consisting of proportional and drift chambers plus a liquid argon photon calorimeter. This thesis reports the results of the process $\pi^+ +A+ \to \pi^+ w +A$. The $\pi^+ w$ spectrum was found to be dominated by the $B^+$ (l237) meson. A fit was performed on the line shape of the $\pi^+ w$ mass spectrum and values of 1.271 ± 0.011 GeV and 0.232 ± 0.029 GeV were found for the mass and total width. The helicity zero decay probability of - the $w, \mid F_0\mid^2$, was measured to be $\mid F_0\mid^2$ = 0.l5 $\pm$ 0.035. The t distributions were analyzed allowing the electromagnetic and hadronic - production processes to interfer. From these distributions a - radiative width of 230 $\pm$ 61 was extracted.