2009/07/12 by Amarjit Soni, Soni, Amarjit
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle Detector Development and Performance #Particle physics theoretical and experimental studies
paper · doi:10.48550/arxiv.0907.2057
openalex publication_date 2009/07/12 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
Attention is drawn to the several 2-3 σ "anomalies" in B, Bs mixings and decays involving CP-observables. Perhaps the most interesting theoretical scenario that could cause such effects is based on warped extra-dimensional models and indeed some of the effects were predicted there. However, a rather simple explanation is that based on a fourth family of quarks with masses in the range of(400 - 600) GeV. The built-in hierarchy of the 4×4 mixing matrix is such that the t' readily provides a needed \it perturbation (≈ 15%) to sin 2 β as measured in B → ψKs and simultaneously is the dominant source of CP asymmetry in Bs → ψϕ. The latter mode is theoretically very clean (unlike the others) and therefore it would be extremely desirable that Fermilab gives a very high priority to clarify this anomaly at the earliest. 4th family explanation allows, with relative ease, to accomodate the stringent flavor changing constraints which usually can be quite challenging for new physics scenarios.Implications for the LHC are briefly discussed; t' and b' lead to high pt multilepton events, in particular b' decays produce rather distinctive same sign leptons with asymmetric energies.