Lattice Flavour Physics with an eye to Super-B

Tarantino, Cecilia

doi:10.22323/1.164.0012

Cited by 1 publication

(9 citation statements)

References 35 publications

(37 reference statements)

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“…h )] from a combined chiral and continuum fit, we finally get our results for f Bs and [f Bs /f B ] respectively. As expected the combined chiral and continuum fit for the quantity f hs (µ (1) h ) is smooth and shows tolerably small cutoff effects, as well as a very weak dependence on the light quark mass (see Fig. 5(b)).…”

Section: Computation Of the B-quark Mass And Decay Constants F B And supporting

confidence: 78%

“…More quantitatively, one can compare our results for the decay constants with the averages quoted by the FLAG working group from N f = 2 + 1 calculations [74]: 1 and ξ. Each of the numbers in the first row includes the uncertainties coming from the statistical errors of the correlators, the uncertainty of the quark mass renormalisation, the error of the combined chiral and continuum fits and the statistical uncertainty from the scale setting.…”

Section: Summary Of Results and Discussionmentioning

confidence: 81%

“…Bag parameters defined at µ (1) h are determined as usual by a combined chiral and continuum fit that shows small discretisation effects. In Figs 11(a) and 11(b) we present the fit for the cases of B i cases HMChPT predicts a logarithmic chiral behaviour [69].…”

Section: Ratio Methods For the Bag Parameters And ξmentioning

confidence: 99%

“…In Fig. 15(a) we show the combined chiral and continuum fit for the bag parameter ratios at µ (1) h for four values of the lattice spacing. We have made use of two fit ansätze.…”

Section: Ratio Methods For the Bag Parameters And ξmentioning

confidence: 99%

“…For a recent review of lattice results see Ref. [1]. Lattice methods are irreplaceable for the calculation of the so called golden plated processes since hadronisation effects are fully under control.…”

Section: Introductionmentioning

confidence: 99%

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

Carrasco

Ciuchini

Dimopoulos

et al. 2014

J. High Energ. Phys.

112

160

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We present a lattice QCD computation of the b-quark mass, the B and B_s decay constants, the B-mixing bag parameters for the full four-fermion operator basis as well as determinations for \xi and f_{Bq}\sqrt{B_i^{(q)}} extrapolated to the continuum limit and to the physical pion mass. We used N_f = 2 twisted mass Wilson fermions at four values of the lattice spacing with pion masses ranging from 280 to 500 MeV. Extrapolation in the heavy quark mass from the charm to the bottom quark region has been carried out on ratios of physical quantities computed at nearby quark masses, exploiting the fact that they have an exactly known 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 and f_{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 computed the bag parameters for the complete basis of the four-fermion operators which are required in beyond the SM theories. By using these results for the bag parameters we are able to provide a refined Unitarity Triangle analysis in the presence of New Physics, improving the bounds coming from B_{(s)}-\bar B_{(s)} mixing

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Section: Computation Of the B-quark Mass And Decay Constants F B And supporting

confidence: 78%

Section: Summary Of Results and Discussionmentioning

confidence: 81%

Section: Ratio Methods For the Bag Parameters And ξmentioning

confidence: 99%

“…In Fig. 15(a) we show the combined chiral and continuum fit for the bag parameter ratios at µ (1) h for four values of the lattice spacing. We have made use of two fit ansätze.…”

Section: Ratio Methods For the Bag Parameters And ξmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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