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We present a lattice QCD computation of the b-quark mass, the B and B_s decayconstants, the B-mixing bag parameters for the full four-fermion operator basisas well as determinations for \xi and f_{Bq}\sqrt{B_i^{(q)}} extrapolated tothe continuum limit and to the physical pion mass. We used N_f = 2 twisted massWilson fermions at four values of the lattice spacing with pion masses rangingfrom 280 to 500 MeV. Extrapolation in the heavy quark mass from the charm tothe bottom quark region has been carried out on ratios of physical quantitiescomputed at nearby quark masses, exploiting the fact that they have an exactlyknown infinite mass limit. Our results are m_b(m_b,\overline{\rm{MS}})=4.29(12) GeV, f_{Bs}=228(8) MeV, f_{B}=189(8) MeV andf_{Bs}/f_B=1.206(24). Moreover with our results for the bag-parameters we find\xi=1.225(31), B_1^{(s)}/B_1^{(d)}=1.01(2), f_{Bd}\sqrt{\hat{B}_{1}^{(d)}} =216(10) MeV and f_{Bs}\sqrt{\hat{B}_{1}^{(s)}} = 262(10) MeV. We also computedthe bag parameters for the complete basis of the four-fermion operators whichare required in beyond the SM theories. By using these results for the bagparameters we are able to provide a refined Unitarity Triangle analysis in thepresence of New Physics, improving the bounds coming from B_{(s)}-\bar B_{(s)}mixing.

B-physics from Nf=2 tmQCD: the Standard Model and beyond