2012/01/31 by Bhubanjyoti Bhattacharya, Michael Gronau, Jonathan L. Rosner · 117 citations
Physics and Astronomy · #Amplitude #Asymmetry #High-Energy Particle Collisions Research #Meson #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Physics #Pseudoscalar #Pseudoscalar meson #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #hep-ph
paper · pdf · doi:10.1103/physrevd.85.054014
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 85(5) (American Physical Society) · 14 pages, 9 figures, final version to be published in Phys. Rev. D. Some text updated
arxiv created 2012/03/13 · openalex publication_date 2012/03/20 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The LHCb Collaboration has recently reported evidence for a CP asymmetry approaching the percent level in the difference between D0\ensuremath→\ensuremathπ+\ensuremathπ^\ensuremath- and D0\ensuremath→K+K^\ensuremath-. We analyze this effect as if it is due to a penguin amplitude with the weak phase of the standard model c\ensuremath→b\ensuremath→u loop diagram, but with a CP-conserving enhancement as if due to the strong interactions. In such a case the magnitude and strong phase of this amplitude Pb are correlated in order to fit the observed CP asymmetry, and one may predict CP asymmetries for a number of other singly-Cabibbo-suppressed decays of charmed mesons to a pair of pseudoscalar mesons. Nonzero CP asymmetries are expected for D+\ensuremath→K+K0 (the most promising channel for which a nonzero CP asymmetry has not yet been reported), as well as D0\ensuremath→\ensuremathπ0\ensuremathπ0, Ds+\ensuremath→\ensuremathπ+K0, and Ds\ensuremath→\ensuremathπ0K+. No CP asymmetry is predicted for D+\ensuremath→\ensuremathπ+\ensuremathπ0 or D0\ensuremath→K0K0 in this framework.