Study Of The Doubly And Singly Cabibbo Suppressed Decays D K Pi Pi And D S K Pi Pi In The Focus Experiment
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Study of the Doubly and Singly Cabibbo Suppressed Decays D+ --] K+ Pi- Pi+ and D(s)+ --] K+ Pi- Pi+ in the FOCUS Experiment
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Abstract Not Provided.
Study of the Doubly and Singly Cabibbo Suppressed Decays D+ --] K+ Pi- Pi+ and D(s)+ --] K+ Pi- Pi+ in the FOCUS Experiment
This thesis illustrates a complete study of the doubly and singly Cabibbo suppressed decays D{sup +} and D{sub s}{sup +} {yields} K{sup +} {pi}{sup -}{pi}{sup +}. Data for this analysis have been collected by the fixed-target high-energy photoproduction experiment FOCUS at Fermilab. The authors have selected the D{sup +} and D{sub s}{sup +} 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{sup +} yield consists of 189 {+-} 24 events, with a signal to noise ratio {approx} 1; the D{sub s}{sup +} yield is 567 {+-} 31 and the signal to noise ratio is {approx} 2.5. The authors have measured {Lambda}(D{sup +} {yields} K{sup +}{pi}{sup -}{pi}{sup +})/{Lambda}(D{sup +} {yields} K{sup -}{pi}{sup +}{pi}{sup +}) = 0.0065 {+-} 0.0008 {+-} 0.004 and {Lambda}(D{sub s}{sup +} {yields} K{sup +}{pi}{sup -}{pi}{sup +})/{Lambda}(D{sub s}{sup +} {yields} K{sup +}K{sup -}{pi}{sup +}) = 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{sub s}{sup +} {yields} K{sup +}{pi}{sup -}{pi}{sup +} represents the first available measurement for this channel.
Experimental Study of Three-body Cabibbo-suppressed D0 Decays and Extraction of CP Violation Parameters
I present measurements of the relative branching ratios, Dalitz plot structures and CP-asymmetry values in the three-body singly Cabibbo-suppressed decays D0 ->pi-pi+pi0 and D0 ->K-K+pi0 using data collected by the BaBar detector at the PEP-II asymmetric-energy ring at SLAC. I apply the results of the D0 ->pi-pi+pi0 analysis to extracting CP-violation parameters related to the CKM angle gamma (or phi_3) using the decay B- -> D0[->pi-pi+pi0] K-