Measurement of D0–¯¯¯D0 Mixing Parameters and Search for CP Violation Using D0→K+π− Decays
Autor/a
Calvo Gómez, Míriam
Camboni, Alessandro
Vilasís Cardona, Xavier
LHCb Collaboration - CERN
Otros/as autores/as
Universitat Ramon Llull. La Salle
CERN
Fecha de publicación
2013-12-18Resumen
Measurements of charm mixing parameters from the decay-time-dependent ratio of D0→K+π− to D0→K−π+ rates and the charge-conjugate ratio are reported. The analysis uses data, corresponding to 3 fb−1 of integrated luminosity, from proton-proton collisions at 7 and 8 TeV center-of-mass energies recorded by the LHCb experiment. In the limit of charge-parity (CP ) symmetry, the mixing parameters are determined to be x'2=(5.5±4.9)×10−5, y′=(4.8±1.0)×10−3, and RD=(3.568±0.066)×10−3. Allowing for CP violation, the measurement is performed separately for D0 and ¯¯¯D0 mesons yielding AD=(−0.7±1.9)%, for the direct CP-violating asymmetry, and 0.75<|q/p|<1.24 at the 68.3% confidence level, for the parameter describing CP violation in mixing. This is the most precise determination of these parameters from a single experiment and shows no evidence for CP violation.
Tipo de documento
Artículo
Versión publicada
Lengua
English
Materias (CDU)
53 - Física
Palabras clave
Gran col·lisionador d'hadrons (França i Suïssa)
Partícules (Física nuclear)
Col·lisions (Física nuclear)
Protons
Páginas
9 p.
Publicado por
American Physical Society
Publicado en
Physical Review Letters, 2013, Vol. 111, No. 25 (Desembre)
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