53 research outputs found
Hadronic Mass Spectrum Analysis of D+ into K- pi+ mu+ nu Decay and Measurement of the K*(892)^0 Mass and Width
We present a Kpi mass spectrum analysis of the four-body semileptonic charm
decay D+ into K- pi+ mu+ nu in the range of 0.65 GeV < mKpi < 1.5 GeV. We
observe a non-resonant contribution of 5.30 +- 0.74 +0.99 -0.51 % with respect
to the total D+ into K- pi+ mu+ nu decay. For the K*(892)^0 resonance, we
obtain a mass of 895.41 +- 0.32 +0.35 -0.36 MeV, a width of 47.79 +- 0.86 +1.3
-1.1 MeV, and a Blatt-Weisskopf damping factor parameter of 3.96 +- 0.54 +0.72
-0.90 GeV^(-1). We also report 90 % CL upper limits of 4 % and 0.64 % for the
branching ratios of D+ into K*(1680)^0 mu+ nu with respect to D+ into K- pi+
mu+ nu and D+ into K*(1430)^0 mu+ nu with respect to D+ into K- pi+ mu+ nu,
respectively.Comment: 14 page
Study of the decay mode D^0 -> K-K-K+pi+
Using data from the FOCUS (E831) experiment at Fermilab, we present a new
measurement of the branching ratio for the Cabibbo-favored decay mode . From a sample of fully reconstructed events, we measure .
A coherent amplitude analysis has been performed to determine the resonant
substructure of this decay mode. This analysis reveals a dominant contribution
from and states.Comment: 15 pages, 4 figures, to be submitted to Physics Letters
The S-wave from the decay
Using data from FOCUS (E831) experiment at Fermilab, we present a model
independent partial-wave analysis of the S-wave amplitude from the
decay . The S-wave is a generic complex function to be
determined directly from the data fit. The P- and D-waves are parameterized by
a sum of Breit-Wigner amplitudes. The measurement of the S-wave amplitude
covers the whole elastic range of the system.Comment: 13 pages, 9 figures, submitted to Physics Letters
Study of the decay mode D^0 -> K-K+pi-pi+
Using data from the FOCUS (E831) experiment at Fermilab, we present a new
measurement of the branching ratio for the Cabibbo-favored decay mode . From a sample of fully reconstructed events, we measure .
A coherent amplitude analysis has been performed to determine the resonant
substructure of this decay mode. This analysis reveals a dominant contribution
from modes.Comment: 19 pages, 6 figures, to be submitted to Physics Letters
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