1,721,147 research outputs found
Matrix elements of light quarks
No full textLattice results for matrix elements of light quark operators are reviewed. The discussion is focused on recent theoretical progress and new numerical calculations which appeared after the Lattice 2000 Conference
SuperB: A High-Luminosity Asymmetric e+ e- Super Flavor Factory. Conceptual Design Report. M. Bona et al. SLAC-R-856, INFN-AE-07-02, LAL-07-15, May 18, 2007. 480pp Print: arXiv:0709.0451 [hep-ex]
No full text222 citazioni su spire
CHIRAL EXTRAPOLATION OF HYPERON VECTOR FORM-FACTORS
No full textWe present a new study of SU(3)-breaking corrections in hyperon vector form factors relevant for the extraction of Vus. A lattice quenched simulation has been performed, showing that it is possible to reach the required precision to extract SU(3)-breaking corrections in the regime of simulated masses. In order to perform the chiral extrapolation we calculated the chiral corrections to the vector form factor in HBChPT. Besides the one-loop O(p2) contribution, we included also the subleading O(p3) and O(1/MB) corrections that, due to the Ademollo-Gatto theorem, are free from the contamination of unknown low energy constants. The results complete and correct previous calculations, and show that subleading corrections cannot be neglected. We also studied decuplet contributions within HBChPT and show that, in this case, the chiral expansion breaks down, rising doubts on the consistency of the theory. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-ShareAlike Licence
CUTOFF EFFECTS IN MAXIMALLY TWISTED LQCD
No full textThe Symanzik analysis of correlators in lattice QCD with maximally twisted Wilson fermions reveals that there exist cutoff artifacts which tend to become large as the quark mass gets small. We show that these effects can be reduced to a negligible level by either introducing the clover term in the action or, as already suggested in the literature, by a suitable choice of the critical mass. Recent simulation data support these conclusions. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-ShareAlike Licence
Computation of the b-quark mass with perturbative matching at the next-to-next-to-leading order
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