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CP Asymmetry A_{ψK_S}, \sin 2β, the Sign of ΔM_B and the Physics Beyond the Standard Model
Monika Blanke, Andrzej J. Buras
We demonstrate that the sign of the B^0-\bar B^0 mass difference ΔM_B is irrelevant for the extraction of the angle β=ϕ_1 of the unitarity triangle from the CP asymmetry A_{ψK_S}.…
B -> pi pi, New Physics in B -> pi K and Rare K and B Decays
Andrzej J. Buras, Robert Fleischer, Stefan Recksiegel +1
We summarize a recent strategy for a global analysis of the B -> pi pi, pi K systems and rare decays. We find that the present B -> pi pi and B -> pi K data cannot be simultaneousl…
The B -> pi pi,pi K Puzzles in the Light of New Data: Implications for the Standard Model, New Physics and Rare Decays
Andrzej J. Buras, Robert Fleischer, Stefan Recksiegel +1
Recently, we developed a strategy to analyse the B -> pi pi,pi K data. We found that the B -> pi pi measurements can be accommodated in the Standard Model (SM) through large non-fa…
Particle-Antiparticle Mixing, ε_K and the Unitarity Triangle in the Littlest Higgs Model
Andrzej J. Buras, Anton Poschenrieder, Selma Uhlig
We calculate the K^{0}-\bar{K}^{0}, B_{d,s}^{0}-\bar{B}_{d,s}^{0} mixing mass differences ΔM_K, ΔM_{d,s} and the CP-violating parameter ε_{K} in the Littlest Higgs (LH) model. For…
B->X_s l^+l^- in the MSSM at NNLO
Christoph Bobeth, Andrzej J. Buras, Thorsten Ewerth
We present the results of the calculation of QCD corrections to the matching conditions for the Wilson coefficients of operators mediating the transition b->s l^+l^- in the context…
K^+ -> pi^+ nu nu-bar and K_L -> pi^0 nu nu-bar Decays in the General MSSM
Andrzej J. Buras, Thorsten Ewerth, Sebastian Jager +1
We reanalyze the rare decays K^+ -> pi^+ nu nu-bar and K_L -> pi^0 nu nu-bar in a general MSSM with conserved R-parity. Working in the mass eigenstate basis and performing adaptive…
Early SU(4)_PS x SU(2)_L x SU(2)_R x SU(2)_H Unification of Quarks and Leptons
Andrzej J. Buras, P. Q. Hung, Ngoc-Khanh Tran +2
We discuss various aspects of the early petite unification (PUT) of quarks and leptons based on the gauge group G_PUT=SU(4)_PS x SU(2)_L x SU(2)_R x SU(2)_H. This unification takes…
Waiting for Precise Measurements of K^+->pi^+ nu nu and K_L->pi^0 nu nu
Andrzej J. Buras, Felix Schwab, Selma Uhlig
In view of future plans for accurate measurements of the theoretically clean branching ratios Br(K+ -> pi+ nu nu) and Br(KL -> pi0 nu nu), that should take place in the next decade…
Waiting for Clear Signals of New Physics in B and K Decays
Andrzej J. Buras
We classify the extensions of the Standard Model (SM) according to the structure of local operators in the weak effective Hamiltonian and the presence or absence of new flavour and…
Anatomy of Prominent B and K Decays and Signatures of CP-Violating New Physics in the Electroweak Penguin Sector
Andrzej J. Buras, Robert Fleischer, Stefan Recksiegel +1
The recent observation of B_d -> pi^0 pi^0 at the B factories with a surprisingly large branching ratio represents a challenge for theory, and complements the amazingly small B_d -…