Evidence for new interference phenomena in the decay D + → K -π +μ +ν
Using a large sample of charm semileptonic decays collected by the FOCUS photoproduction experiment at Fermilab, we present evidence for a small, even spin K -π + amplitude that interferes with the dominant K* 0 component in the D + → K -π +μ +ν final state. Although this interference significantly distorts the D + → K -π +μ +ν decay angular distributions, the new amplitude creates only a very small distortion to the observed kaon pion mass distribution when integrated over the other kinematic variables describing the decay. Our data can be described by K* 0 interference with either a constant amplitude or broad spin zero resonance. © 2002 Elsevier Science B.V. All rights reserved.
Link, J. M.; Reyes, M.; Yager, P. M.; Anjos, J. C.; Bediaga, I.; Göbel, C.; Magnin, J.; Massafferri, A.; Kryemadhi, Abaz; and Pepe, I. M., "Evidence for new interference phenomena in the decay D + → K -π +μ +ν" (2002). Educator Scholarship & Departmental Newsletters. 218.