Fourth generation quark mass limits in CKM-element space

Abstract

We present a reanalysis of CDF data to extend limits on individual fourth-generation quark masses from particular flavor-mixing rates to the entire space of possible mixing values. Measurements from CDF have set individual limits on masses, $m_{b^{\prime }}$ and $m_{t^{\prime }}$, at the level of $335$--$385$ GeV assuming specific and favorable flavor-mixing rates. We consider the space of possible values for the mixing rates and find that the CDF data imply limits of $290$ GeV and greater over a wide range of mixing scenarios. We also analyze the limits from the perspective of a four-generation CKM matrix. We find that present experimental constraints on CKM elements do not suggest further constraints on fourth-generation quark masses.

References in corpus (3)

• Precision Constraints on Extra Fermion Generations
• Direct Mass Limits for Chiral Fourth-Generation Quarks in All Mixing Scenarios
• Bounding CKM Mixing with a Fourth Family

Cited by in corpus (6)

• A Higgs Conundrum with Vector Fermions
• Two Higgs doublets with 4th generation fermions - models for TeV-scale compositeness
• Probing Extra Matter in Gauge Mediation Through the Lightest Higgs Boson Mass
• Large mass splittings for fourth generation fermions allowed by LHC Higgs exclusion
• Confronting the fourth generation two Higgs doublet model with the phenomenology of heavy Higgs bosons
• Threshold Effects in the Decay of Heavy b' and t' Quarks