| Popis: |
In this thesis, we performed a study for the decay D{sup +}{yields}K{sup -}K{sup +}K{sup +} and D{sub s}{sup +}{yields}K{sup -}K{sup +}K{sup +}, using the data collected by the E791, a hadroproduction of charm experiment at Fermilab. The D{sup +}{yields}K{sup -}K{sup +}K{sup +} decay is doubly Cabibbo suppressed while the D{sub s}{sup +}{yields}K{sup -}K{sup +}K{sup +} decay is singly Cabibbo suppressed. We found 11.6{+-}3.9 events in the D{sup +} mass region and 8.9{+-}3.3 in the D{sub s}{sup +} mass region. The D{sup +}{yields}K{sup -}K{sup +}K{sup +} branching ratio is measured to be (3.7{+-}1.3{+-}0.6)x10{sup -4} while the D{sub s}{sup +}{yields}K{sup -}K{sup +}K{sup +} branching ratio relative to D{sub s}{sup +}{yields}{phi}{pi}{sup +} is measured to be (4.2{+-}1.5{+-}0.6)x10{sup -2}. |
