Study of the doubly and singly Cabibbo suppressed decays D⁺ → K⁺π^-π⁺ and D_s⁺ → K⁺π^-π⁺ in the FOCUS experiment

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 2005

DOI:https://doi.org/10.2172/15020131· OSTI ID:15020131

Edera, Laura ^[1]

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1. Univ. of Milan (Italy)

This thesis illustrates a complete study of the doubly and singly Cabibbo suppressed decays D⁺ and D_s⁺ → K⁺ π^-π⁺. Data for this analysis have been collected by the fixed-target high-energy photoproduction experiment FOCUS at Fermilab. The authors have selected the D⁺ and D_s⁺ samples with cuts to obtain a sufficiently high statistics, a good signal to noise ratio and, at the same time, eliminate possible contaminations from the more copious and favored decays. The D⁺ yield consists of 189 ± 24 events, with a signal to noise ratio ~ 1; the D_s⁺ yield is 567 ± 31 and the signal to noise ratio is ~ 2.5. The authors have measured Γ(D⁺ → K⁺π^-π⁺)/Γ(D⁺ → K^-π⁺π⁺) = 0.0065 ± 0.0008 ± 0.004 and Γ(D_s⁺ → K⁺π^-π⁺)/Γ(D_s⁺ → K⁺K^-π⁺) = 0.127 ± 0.007 ± 0.014, improving the previous determinations of a factor of 2 and 5, respectively. The author has also performed a Dalitz plot analysis for both decays. The amplitude analysis for D_s⁺ → K⁺π^-π⁺ represents the first available measurement for this channel.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 15020131
• Report Number(s): FERMILAB-THESIS--2005-26
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
DALITZ PLOT
Experiment-HEP
FERMILAB
PHOTOPRODUCTION
SIGNAL-TO-NOISE RATIO
STATISTICS