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Title: First observation of D0-D-0 oscillations in D0 →k+π-π+π- decays and measurement of the associated coherence parameters
Author: LHCb Collaboration
Gascón Fora, David
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Marin Benito, C.
Picatoste Olloqui, Eduardo
Rives Molina, Vicente José
Garrido Beltrán, Lluís
Keywords: Hadrons
Partícules (Física nuclear)
Particles (Nuclear physics)
Issue Date: 17-Jun-2016
Publisher: American Physical Society
Abstract: Charm meson oscillations are observed in a time-dependent analysis of the ratio of D0→K+π−π+π− to D0→K−π+π−π+ decay rates, using data corresponding to an integrated luminosity of 3.0  fb−1 recorded by the LHCb experiment. The measurements presented are sensitive to the phase-space averaged ratio of doubly Cabibbo-suppressed to Cabibbo-favored amplitudes rK3πD and the product of the coherence factor RK3πD and a charm mixing parameter y′K3π. The constraints measured are rK3πD=(5.67±0.12)×10−2, which is the most precise determination to date, and RK3πDy′K3π=(0.3±1.8)×10−3, which provides useful input for determinations of the CP-violating phase γ in B±→DK±, D→K∓π±π∓π± decays. The analysis also gives the most precise measurement of the D0→K+π−π+π− branching fraction, and the first observation of D0-¯D0 oscillations in this decay mode, with a significance of 8.2 standard deviations.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2016, vol. 116, num. 24, p. 241801
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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