Using a sample of four million hadronic Z events collected in ALEPH from 1991 to 1995, the decays D*+ --> D(0)pi(+), with D(0) decaying to K(-) pi(+) or to K(+) pi(-), are studied. The relative branching ratio B(D(0) --> K(+) pi(-))/B(D(0) --> K(-) pi(+)) is measured to be (1.84 +/- 0.59(stat.) +/- 0.34(syst.))%. The two possible contributions to the D(0) --> K(+) pi(-) decay, doubly Cabibbo-suppressed decays and D(0)-(D)over bar(0) mixing, are disentangled by measuring the proper-time distribution of the reconstructed D0's. Assuming no interference between the two processes, the upper limit obtained on the mixing rate is 0.92% at 95% CL. The possible effect of interference between the two amplitudes is also assessed.

R., B., D., B., D., D., P., G., C., G., J. P., L., et al. (1998). Study of D(0)-(D)over-bar(0) mixing and D(0) doubly Cabibbo-suppressed decays. PHYSICS LETTERS. SECTION B, 436(1-2), 211-221 [10.1016/S0370-2693(98)00946-0].

Study of D(0)-(D)over-bar(0) mixing and D(0) doubly Cabibbo-suppressed decays

CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
1998-01-01

Abstract

Using a sample of four million hadronic Z events collected in ALEPH from 1991 to 1995, the decays D*+ --> D(0)pi(+), with D(0) decaying to K(-) pi(+) or to K(+) pi(-), are studied. The relative branching ratio B(D(0) --> K(+) pi(-))/B(D(0) --> K(-) pi(+)) is measured to be (1.84 +/- 0.59(stat.) +/- 0.34(syst.))%. The two possible contributions to the D(0) --> K(+) pi(-) decay, doubly Cabibbo-suppressed decays and D(0)-(D)over bar(0) mixing, are disentangled by measuring the proper-time distribution of the reconstructed D0's. Assuming no interference between the two processes, the upper limit obtained on the mixing rate is 0.92% at 95% CL. The possible effect of interference between the two amplitudes is also assessed.
1998
R., B., D., B., D., D., P., G., C., G., J. P., L., et al. (1998). Study of D(0)-(D)over-bar(0) mixing and D(0) doubly Cabibbo-suppressed decays. PHYSICS LETTERS. SECTION B, 436(1-2), 211-221 [10.1016/S0370-2693(98)00946-0].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/37529
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