Abstract
Using a large sample of D+→K−π+μ+ν decays collected by the FOCUS photoproduction experiment at Fermilab, we present new measurements of two semileptonic form factor ratios: rv and r2. We find rv=1.504±0.057±0.039 and r2=0.875±0.049±0.064. Our form factor results include the effects of the s-wave interference discussed in Phys. Lett. B 535 (2002) 43.
Highlights
This paper provides new measurements of the parameters that describe D+ →K−π+μ+ν decay
We found that the values of r2 and rv changed by less than 6% of their statistical error when fit with this alternative form
The data for this paper were collected in the Wideband photoproduction experiment FOCUS during the Fermilab 1996–1997 fixed-target run
Summary
The sense of the acoplanarity variable is defined via a cross product expression of the form: (Pμ × Pν) × (PK × Pπ) · PKπ where all momentum vectors are in the D+ rest frame Since this expression involves five momentum vectors, as one goes from D+ → D− one must change χ → −χ in Equation 1 to get the same intensity for the D+ and D− assuming CP symmetry. V (0) − q2/MV2 where we use nominal (spectroscopic) pole masses of MA = 2.5 GeV/c2 and MV = 2.1 GeV/c2 Under these assumptions, the decay intensity is parameterized by the rv ≡ V (0)/A1(0) , r2 ≡ A2(0)/A1(0) , r3 ≡ A3(0)/A1(0) form factor ratios describing the D+ → K∗0μ+ν amplitude and the modulus A and phase δ describing the s-wave amplitude. Throughout this paper, unless explicitly stated otherwise, the charge conjugate is implied when a decay mode of a specific charge is stated
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