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.

Evidence for new interference phenomena in the decay D+-> K-pi(+)mu(+)nu

BONOMI, Germano;
2002-01-01

Abstract

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11379/109345
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