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Title: Measurement of CP asymmetries in two-body B (s)0 -meson decays to charged pions and kaons
Author: 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
Keywords: Hadrons
Gran Col·lisionador d'Hadrons
Física de partícules
Large Hadron Collider (France and Switzerland)
Particle physics
Issue Date: 2018
Publisher: American Physical Society
Abstract: 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−.
Note: Reproducció del document publicat a:
It is part of: Physical Review D, 2018, vol. 98, num. 3, p. 1-15
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ISSN: 2470-0010
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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