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http://hdl.handle.net/2445/185372
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 Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments |
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: https://doi.org/10.1103/PhysRevD.98.032004 |
It is part of: | Physical Review D, 2018, vol. 98, num. 3, p. 1-15 |
URI: | http://hdl.handle.net/2445/185372 |
Related resource: | https://doi.org/10.1103/PhysRevD.98.032004 |
ISSN: | 2470-0010 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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