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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/185372
Measurement of CP asymmetries in two-body B (s)0 -meson decays to charged pions and kaons
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CP asymmetries have been measured recently by the LHCb collaboration in three-body B+ decays to final states involving charged pions and kaons. Large asymmetries with opposite signs at a level of about 60% have been observed in B± → π ±(or K±)π +π − and B± → π ±K+K− for restricted regions in the Dalitz plots involving π +π − and K+K− with low invariant mass. U-spin is shown to predict corresponding ∆S = 0 and ∆S = 1 asymmetries with opposite signs and inversely proportional to their branching ratios, in analogy with a successful relation predicted thirteen years ago between asymmetries in Bs → K−π + and B0 → K+π −. We compare these predictions with the measured integrated asymmetries. Effects of specific resonant or non-resonant partial waves on enhanced asymmetries for low-pair-mass regions of the Dalitz plot are studied in B± → π ±π +π −. The closure of low-mass π +π − and K+K− channels involving only ππ ↔ KK¯ rescattering may explain by CPT approximately equal magnitudes and opposite signs measured in B± → π ±π +π − and B± → π ±K+K−.
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ALFONSO ALBERO, Alejandro, CALVO GÓMEZ, Míriam, CAMBONI, Alessandro, COQUEREAU, Samuel, GARRIDO BELTRÁN, Lluís, GASCÓN FORA, David, GRACIANI DÍAZ, Ricardo, GRAUGÉS POUS, Eugeni, MARIN BENITO, Carla, LHCb Collaboration. Measurement of CP asymmetries in two-body B (s)0 -meson decays to charged pions and kaons. _Physical Review D_. 2018. Vol. 98, núm. 3, pàgs. 1-15. [consulta: 23 de gener de 2026]. ISSN: 2470-0010. [Disponible a: https://hdl.handle.net/2445/185372]