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Your search keyword '"Pène, O"' showing total 5 results
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5 results on '"Pène, O"'

1. mu-Squared Dependent Deviation of the Non Perturbative ZA,MOM from the True Axial Renormalisation Constant, Implied by Ward Identity

Author

Boucaud, Ph., Leroy, J. -P., Yaouanc, A. Le, Micheli, J., Pène, O., and Rodriguez-Quintero, J.

Subjects
High Energy Physics - Lattice
Abstract

It is recalled why, as already stated in a previous paper, there seems to be an inconsistency in identifying the non perturbative ZA,MOM as the renormalisation of the axial current, or equivalently, in setting as normalisation condition that the renormalised vertex=1 at p^2 = mu^2 at some renormalisation scale mu, where p is the momentum in the legs. Indeed, unlike the vector case, the Ward-Takahashi (WT) identity for the axial current is shown to imply both the renormalisation scale independence of ZA and a mu2 dependence of ZA,MOM. This mu^2 dependence is simply related to certain invariants in the pseudoscalar vertex and can persist in the chiral limit due to the spontaneous breaking of chiral symmetry (pion pole). It is seen clearly in the mu^2 dependence of some lattice calculations of ZA,MOM/ZV,MOM near the chiral limit., Comment: One reference added; some minor material errors corrected; no substantial change with respect to the first version

Published
2015

3. Semileptonic B→D∗∗ decays in lattice QCD: a feasability study and first results

Author

Atoui, M.Laboratoire de Physique Corpusculaire de Clermont-Ferrand, Unité Mixte de Recherche 6533 CNRS/IN2P3, Université Blaise Pascal, BP 80026, Campus des Cézeaux, 24 avenue des Landais, 63171, Aubière Cedex, France, Blossier, B.(Laboratoire de Physique Théorique, Unité Mixte de Recherche 8627 du Centre National de la Recherche Scientifique et Université Paris-Sud XI, Bâtiment 210, 91405, Orsay Cedex, France), Morénas, V.(Laboratoire de Physique Corpusculaire de Clermont-Ferrand, Unité Mixte de Recherche 6533 CNRS/IN2P3, Université Blaise Pascal, BP 80026, Campus des Cézeaux, 24 avenue des Landais, 63171, Aubière Cedex, France), Pène, O.(Laboratoire de Physique Théorique, Unité Mixte de Recherche 8627 du Centre National de la Recherche Scientifique et Université Paris-Sud XI, Bâtiment 210, 91405, Orsay Cedex, France), and Petrov, K.(Inria Saclay, Bâtiment Alan Turing, 1 rue Honoré d’Estienne d’Orves, Campus de l’Ecole Polytechnique, 91120, Palaiseau, France)

Abstract

We compute the decays B→D0∗ and B→D2∗ with finite masses for the b and c quarks. We first discuss the spectral properties of both the B meson as a function of its momentum and the D0∗ and D2∗ at rest. We compute the theoretical formulae leading to the decay amplitudes from the three-point and two-point correlators. We then compute the amplitudes at zero recoil of B→D0∗ , which turns out not to be vanishing contrary to what happens in the heavy quark limit. This opens the possibility to get better agreement with experiment. To improve the continuum limit we have added a set of data with smaller lattice spacing. The B→D2∗ vanishes at zero recoil and we show a convincing signal but only slightly more than 1 sigma from 0. In order to reach quantitatively significant results we plan to exploit fully smaller lattice spacings as well as another lattice regularisation.

Published
2015

5. Semileptonic B → D** decays in lattice QCD: a feasability study and first results.

Author

Atoui, M., Blossier, B., Pène, O., and Petrov, K.

Abstract

We compute the decays B → D*0and B → D*2 with finite masses for the b and c quarks. We first discuss the spectral properties of both the B meson as a function of its momentum and the D*2 and D*2 at rest. We compute the theoretical formulae leading to the decay amplitudes from the three-point and two-point correlators. We then compute the amplitudes at zero recoil of B → D*2 , which turns out not to be vanishing contrary to what happens in the heavy quark limit. This opens the possibility to get better agreement with experiment. To improve the continuum limit we have added a set of data with smaller lattice spacing. The B → D*2 vanishes at zero recoil and we show a convincing signal but only slightly more than 1 sigma from 0. In order to reach quantitatively significant results we plan to exploit fully smaller lattice spacings as well as another lattice regularisation. [ABSTRACT FROM AUTHOR]

Published
2015
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