2010/04/30 by Andrzej J. Buras, Björn Duling, Thorsten Feldmann +3
Physics and Astronomy · #Asymmetry #CP violation #Charm (quantum number) #Mixing (physics) #Neutrino Physics Research #Observable #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1007/jhep07(2010)094
published as JHEP 1007:094,2010 · 22 pages, 23 figures, v2 (references added)
arxiv created 2010/06/21 · openalex publication_date 2010/07/01 · arxiv updated 2015/03/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study D0-D0 mixing in the presence of a fourth generation of quarks. In particular, we calculate the size of the allowed CP violation which is found at the observable level well beyond anything possible with CKM dynamics. We calculate the semileptonic asymmetry aSL and the mixing induced CP asymmetry etafSf which are correlated with each other. We also investigate the correlation of etafSf with a number of prominent observables in other mesonic systems like epsilon'/epsilon, Br(KL -> pi0 nu nu), Br(K+ -> pi+ nu nu), Br(Bs ->mu+ mu-), Br(Bd -> mu+ mu-) and finally Spsi phi in the Bs system. We identify a clear pattern of flavour and CP violation predicted by the SM4 model: While simultaneous large 4G effects in the K and D systems are possible, accompanying large NP effects in the Bd system are disfavoured. However this behaviour is not as pronounced as found for the LHT and RSc models. In contrast to this, sizeable CP violating effects in the Bs system are possible unless extreme effects in etafSf are found, and Br(Bs ->mu+ mu-) can be strongly enhanced regardless of the situation in the D system. We find that, on the other hand, Spsi phi > 0.2 combined with the measured epsilon'/epsilon significantly diminishes 4G effects within the D system.