CP violation and the 4th generation

  title={CP violation and the 4th generation},
  author={G. Eilam and B. Meli{\'c} and J. Trampeti'c},
  journal={Physical Review D},
Within the Standard model with the 4th generation quarks b' and t' we have analyzed CP-violating flavor changing neutral current processes t -> cX; b'-> sX, b'-> bX,t'-> cX, and t'-> tX, with X=Z,H,gamma,g, by constructing and employing global, unique fit for the 4th generation mass mixing matrix CKM4 at 300 s(Z,H,gamma,g))= (90,73,52,30)%, at m_t' ~ 300,300,380,400 GeV, respectively. From the experimental point of view the best decay mode, out of the above four, is certainly b'-> s gamma… Expand

Figures and Tables from this paper

The impact of a 4th generation on mixing and CP violation in the charm system
We study $$ {D^0} - {\overline D^0} $$ 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 levelExpand
Collider signals of a composite Higgs in the Standard Model with four generations
Abstract Recent fits of electroweak precision data to the Standard Model (SM) with a 4th sequential family (SM4) point to a possible “three-prong composite solution”: (1) the Higgs mass is at theExpand
Patterns of flavour violation in the presence of a fourth generation of quarks and leptons
We calculate a number of observables related to particle-antiparticle mixing and the branching ratios for the most interesting rare and CP-violating K and B decays in the Standard Model (SM3)Expand
Detecting fourth generation quarks at hadron colliders
A bstractAlthough there is no compelling evidence, at present, against the Standard Model (SM), in the past few years, a number of 2-3 sigma tensions have appeared which could be alleviated simply byExpand
Lepton flavour violation in the presence of a fourth generation of quarks and leptons
We calculate the rates for the charged lepton flavour violating (LFV) decays ℓi → ℓjγ, τ → ℓπ, τ → ℓη(′), μ− → e−e+e−, the six three-body leptonic decays τ− → ℓi−ℓj+ℓk− and the rate for μ − eExpand
Flavour Theory: 2009
After an overture and a non-technical exposition of the relevant theoretical framework including a brief discussion of some of the most popular extensions of the Standard Model, we will compile aExpand
An improved observable for the forward-backward asymmetry in B → K∗ℓ+ℓ−and Bs → ϕ ℓ+ℓ−
We study the decay B → K∗ℓ+ℓ−in the QCD factorization approach and propose a new integrated observable whose dependence on the form factors is almost negligible, consequently the non-perturbativeExpand
CERN CDS information server CMS PAS HIN-14-010 CMS Physics Analysis Summary
  • 2011
An analysis of the momentum flow in PbPb and pp collisions containing high momentum jets is performed in order to understand the energy loss of partons traveling in a hot and dense medium. TheExpand
Production and Decay of Up-Type and Down-Type New Heavy Quarks through Anomalous Interactions at the LHC
We study the process (where and and ) through the anomalous interactions of the new heavy quarks at the LHC. Considering the present limits on the masses and mixings, the signatures of the heavyExpand
Dynamical Electroweak Symmetry Breaking with a Heavy Fourth Generation
Abstract A heavy fourth generation with a mass of the order of 400 GeV or more could trigger dynamical electroweak symmetry breaking by forming condensates through the exchange of a fundamental HiggsExpand


Difference in B+ and B0 direct CP asymmetry as an effect of a fourth generation.
A perturbative QCD factorization approach is used for B --> Kpi amplitudes and critically compares t' effects on direct CP violation in B+ --> K+ pi0 with b --> sl+ l- and B(s) mixing to predict sin2phi(Bs) to be negative. Expand
Flavor changing neutral currents involving heavy quarks with four generations
We study various flavor changing neutral currents (FCNC) involving heavy quarks in the Standard Model (SM) with a sequential fourth generation. After imposing B ! Xs°, B ! Xsl + l i and Z ! bbExpand
The "4th generation", B-CP anomalies & the LHC
Attention is drawn to the several 2-3 $\sigma$ "anomalies" in B, $B_s$ mixings and decays involving CP-observables. Perhaps the most interesting theoretical scenario that could cause such effects isExpand
Charmless decays of bottom mesons and a fourth generation.
B decays to charmless inclusive final states are discussed and it is found that charmless branching ratio >20% would be difficult to accomodate in the standard model even with four families. Expand
Possible indications of new physics in B d -mixing and in sin (2 β) determinations
Abstract Using the hadronic matrix elements from the lattice, B K and ξ s , involving only the 4-quark operators for Δ flavor = 2 Hamiltonian relevant for K – K ¯ , B d – B ¯ d and B s – B ¯ sExpand
CP violation in fourth generation quark decays
We show that, if a fourth generation is discovered at the Tevatron or LHC, one could study CP violation (CPV) in b' → s decays. Asymmetries could reach 30% for b' → sZ for m b' ≲ 350 GeV, while itExpand
Flavour Dynamics: CP Violation and Rare Decays
These lectures give an up to date description of CP violation and rare decays of K and B mesons and consist of ten chapters: i) Grand view of the field including CKM matrix and the unitarityExpand
How much space is left for a new family of fermions
We perform an exploratory study of the allowed parameter range for the CKM-like mixing of hypothetical quarks of a fourth generation. As experimental constraints we use the tree-level determinationsExpand
Effects of Superheavy Quarks and Leptons in Low-Energy Weak Processes KL-> Formula, K+-> + Formula and K0 Formula0
We investigate potentially important effects due to the existence of superheavy quarks and leptons of the sequential type in higher·order weak processes at low energies. The second-order LlS * 0Expand
CP violation in top physics
Abstract CP violation in top physics is reviewed. The standard model has negligible effects, consequently CP violation searches involving the top quark may constitute the best way to look for physicsExpand