Mixing and CP-Violation in the Littlest Higgs Model with T-Parity

The results of an extensive flavour physics analysis in the Littlest Higgs model with T-parity are presented. In particular, mixing and CP-violation in K^0 and B^0_{d,s} systems have been studied. Several scenarios defined by the values of mirror quark masses and the parameters of the new flavour mixing matrix V_Hd have been considered. A very interesting scenario is identified, where the well-known kaon constraints are satisfied, the sin(2beta) and Delta M_s issues are improved w.r.t the Standard Model and visible effects could be soon found in A_SL^s and S_{psi phi}.Comment: 4 pages, 2 figures, talk given at ICHEP 2006, 26 July - 2 August, Moscow (Russia

Flavour Physics in the Littlest Higgs Model with T-Parity

We present the results of an extensive analysis of flavour physics in both quark and lepton sectors, in the Littlest Higgs model with T-parity (LHT). In the quark sector, we identify some interesting scenarios for new mirror quark masses and V_Hd mixing matrix that satisfy the existing experimental constraints from K and B physics and simultaneously allow large New Physics effects in rare decays and CP-violating observables. In the lepton sector, where flavour violation in the Standard Model is highly suppressed by small neutrino masses, LHT effects turn out to be naturally huge and could be seen in the near future measurements of lepton flavour violating decays.Comment: Contribution to the proceedings of HQL06, Munich, October 16th-20th 2006. 11 pages, 3 figures, 2 tables. New bounds from Belle and BaBar included in Table 1, some entries in Table 2 modified, few references added. Conclusions unchange

Lepton Flavour Violating Decays in the Littlest Higgs Model with T-Parity

We present the results of an extensive analysis of lepton flavour violating decays in the Littlest Higgs model with T-parity (LHT). As lepton flavour violation is highly suppressed in the Standard Model by small neutrino masses, the LHT effects turn out to be naturally huge and could be seen in the near future experiments.Comment: 3 pages, 1 table. Proceedings of the talk presented at the EPS Conference on High Energy Physics 2007, Mancheste

B-Physics: Theoretical Predictions in the LHC Era

We discuss the status of the theoretical predictions of some interesting b-physics observables that are sensitive to New Physics and can be measured at the LHC.Comment: 8 pages, to appear in the proceedings of "V Italian Workshop on the p-p Physics at the LHC" (Perugia, 30th January - 2nd February, 2008), two references adde

Beauty Hadron Lifetimes and B-Meson CP-Violation Parameters from Lattice QCD

The present status of the theoretical estimates of beauty hadron lifetime ratios and of width differences and CP-violation parameters in $B_d$ and $B_s$ systems is reviewed. In the last two years accurate lattice calculations and next-to-leading order perturbative computations have improved these theoretical predictions, leading to the following updated results: \tau(B^+)/\tau(B_d)=1.06 +- 0.02, \tau(B_s)/\tau(B_d)=1.00 +- 0.01, \tau(\Lambda_b)/\tau(B_d)=0.88 +- 0.05, \Delta \Gamma_{d}/\Gamma_{d} = (2.42 +- 0.59)10^{-3}, \Delta \Gamma_{s}/\Gamma_{s} = (7.4 +- 2.4)10^{-2}, |(q/p)_d|-1=(2.96 +- 0.67) 10^{-4}$ and |(q/p)_s|-1=-(1.28 +- 0.28) 10^{-5}Comment: Invited talk at "International Europhysics Conference on High-Energy Physics" (HEP 2003), Aachen, Germany, 17-23 Jul 200

Flavor Lattice QCD in the Precision Era

I discuss the important role that Lattice QCD plays in testing the Flavor sector of the Standard Model (SM) and in indirect searches of New Physics. I review in particular the Unitarity Triangle Analysis performed by the UTfit collaboration within and beyond the SM, presenting the recent accurate lattice results that enter the analyses. I conclude with a tentative outlook to the further progresses that we can expect in the next years from Flavor Lattice QCD.Comment: 23 pages, 9 figures, presented at Charm2012, Lattice2012 and ICHEP201

Rare Kaon Decays Beyond the Standard Model

The rare kaon decays K_L -> pi^0 nu {bar nu}, K^+ -> pi^+ nu {bar nu}, K_L -> pi^0 e^+ e^- and K_L -> pi^0 mu^+ mu^- are theoretically very clean and, being strongly CKM suppressed, highly sensitive to New Physics (NP). Recent Flavour Physics analyses show that they represent unique probes for revealing NP effects and to provide information on the NP flavour structure. After a brief discussion of the main properties that make rare K decays so promising and of the basic ideas of the most interesting NP models, we review the results of recent phenomenological analyses both within and beyond the framework of Minimal Flavour Violation (MFV), where the sources of flavour violation are the same as in the Standard Model. Within MFV we present the expectations found for rare K decays from a model-independent analysis and in three MFV models: the Littlest Higgs (LH) model, the (extra-dimension) Appelquist-Cheng-Dobrescu model and the Minimal Supersymmetric Standard Model (MSSM) with MFV. Beyond MFV, we discuss the results recently found within the MSSM (without MFV), the LH model with T-parity (LHT) and the 3-3-1 (Z') model. While in MFV models only small ( pi^0 nu {bar nu}, K^+ -> pi^+ nu {bar nu}, K_L -> pi^0 e^+ e^- and K_L -> pi^0 mu^+ mu^-, beyond MFV, in particular in the MSSM and in the LHT model, large (up to an order of magnitude) enhancements w.r.t. the SM turn out to be possible.Comment: 10 pages, 2 figures, minor improvements, few references added. Final version for the proceedings of the International Conference "Kaon'07", Laboratori Nazionali di Frascati, Italy, 21-25 May 200

FCNC Processes in the LHT Model: a 2009 Look

We present a summary of our recent analysis update of flavour changing neutral current (FCNC) processes in the Littlest Higgs model with T-parity (LHT). The essential novelties of our update are: the removal of the logarithmic UV cutoff dependence by the inclusion of the new contribution to the Z^0-penguin diagrams identified by Goto et al. and by del Aguila et al., the study of the decay K_L -> mu^+ mu^-, a discussion of fine-tuning in epsilon_K and Br(mu -> e gamma).Comment: 3 pages, Proceedings of the 2009 Europhysics Conference on High Energy Physics, July 2009, Krako

Flavour physics and Lattice QCD: averages of lattice inputs for the Unitarity Triangle Analysis

We review recent results of Lattice QCD calculations relevant for flavour physics. We discuss in particular the hadronic parameters entering the amplitudes of K0-K0bar, D0-D0bar and B0-B0bar mixing, the B- and D-meson decay constants and the form factors controlling B-meson semileptonic decays. On the basis of these lattice results, which are extensively collected in the paper, we also derive our averages of the relevant hadronic parameters.Comment: Plenary talk at IFAE 2008, Bologna, Italy, 26-28 March 200