Search forD0−D¯0Mixing

Abstract

We have studied the "wrong-sign" process D0-->K+pi(-) to search for D0-&Dmacr;( 0) mixing. The data come from 9.0 fb(-1) of e(+)e(-) collisions at sqrt[s] approximately 10 GeV recorded with the CLEO II. V detector. We measure the relative rate of the wrong-sign process D0-->K+pi(-) to the Cabibbo-favored process &Dmacr;( 0)-->K+pi(-) to be R = (0.332(+0.063)(-0.065)+/-0.040)%. We study D0-->K+pi(-) as a function of decay time to distinguish direct doubly Cabibbo-suppressed decay from D0-&Dmacr;( 0) mixing. The amplitudes that describe D0-&Dmacr;( 0) mixing, x(') and y('), are consistent with zero. At the 95% C.L. and without assumptions concerning charge-parity ( CP) violating parameters, we find (1/2)x('2)<0.041% and -5.8%<y(')<1.0%.

Rare decayD0→γγ

“…Experimental results on time dependent decay rates of D 0 → K + π − by CLEO [1] and D 0 → K + K − and D 0 → K − π + by FOCUS [2] have stimulated several studies on the D 0 −D 0 oscillations [3]. The recently measured D* decay width by CLEO [4] has provided the long expected information on the value of D * Dπ coupling.…”

SU(3)breaking andD0−D0Falk1, Grossman2, Ligeti3 et al. 2002Phys. Rev. D222112500View full textAdd to dashboardCite

“…(5) for the definition of the neutral D mass eigenstates), and φ is a possible CP violating phase of the mixing amplitude. Second, one can measure the time dependence of doubly Cabibbo suppressed decays, such as D 0 → K + π − [12], which is sensitive to the three quantities (x cos δ + y sin δ) cos φ , (y cos δ − x sin δ) sin φ ,…”

Measurement of the D+ and D+ decays into K+K−K+

“…1 The interpretation of the D 0 modes is complicated by possible contributions from D 0 − D 0 mixing [4][5][6][7], making the D + → K + π − π + decay the only pure DCS decay previously studied.…”