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Real photon emissions leptonic decays
/ Martinelli, Guido (INFN, Rome ; Rome U.) ; Di Carlo, M (INFN, Rome ; Rome U.) ; Mazzetti, F (INFN, Rome ; Rome U.) ; de Divitiis, G M (Rome U., Tor Vergata ; INFN, Rome2) ; Desiderio, A (Rome U., Tor Vergata ; INFN, Rome2) ; Frezzotti, R (Rome U., Tor Vergata ; INFN, Rome2) ; Garofalo, M (Rome U., Tor Vergata ; INFN, Rome2) ; Hansen, M (Rome U., Tor Vergata ; INFN, Rome2) ; Tantalo, N (Rome U., Tor Vergata ; INFN, Rome2) ; Giusti, D (Rome III U. ; INFN, Rome3) et al.
We present a non-perturbative calculation of the form factors which contribute to the amplitudes for the radiative decays $P\to \ell \bar \nu_\ell \gamma$, where $P$ is a pseudoscalar meson and $\ell$ is a charged lepton. Together with the non-perturbative determination of the virtual photon corrections to the processes $P\to \ell \bar \nu_\ell$, this will allow accurate predictions to be made at $O(\alpha_{em})$ for leptonic decay rates for pseudoscalar mesons ranging from the pion to the $B$ meson. [...]
SISSA, 2019 - 7 p.
- Published in : PoS LATTICE2019 (2019) 198
Fulltext: PDF;
In : 37th International Symposium on Lattice Field Theory, Wuhan, Hubei, China, 16 - 22 Jun 2019, pp.198
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B-physics from Nf=2 tmQCD: the Standard Model and beyond
/ ETM Collaboration
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. [...]
arXiv:1308.1851; CERN-PH-TH-2013-173; IFIC-13-47; LPT-ORSAY-13-59; LTH-982; MITP-13-045; RM3-TH-13-6; ROM2F-2013-12; CERN-PH-TH-2013-173.-
2014 - 52 p.
- Published in : JHEP 03 (2014) 016
Article from SCOAP3: PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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B-physics from lattice QCD...with a twist
/ Carrasco, N. (Valencia U. ; Valencia U., IFIC) ; Dimopoulos, P. (Rome U., Tor Vergata ; INFN, Rome2) ; Frezzotti, R. (Rome U., Tor Vergata ; INFN, Rome2) ; Gimenez, V. (Valencia U. ; Valencia U., IFIC) ; Herdoiza, G. (Madrid, Autonoma U. ; Madrid, IFT) ; Lubicz, V. (Rome III U. ; INFN, Rome3) ; Martinelli, G. (SISSA, Trieste ; INFN, Rome) ; Michael, C. (Liverpool U., Dept. Math.) ; Palao, D. (INFN, Rome2) ; Rossi, G.C. (Rome U., Tor Vergata ; INFN, Rome2) et al.
We present a precise lattice QCD determination of the b-quark mass, of the B and Bs decay constants and first results for the B-meson bag parameters. For our computation we employ the so-called ratio method and our results benefit from the use of improved interpolating operators for the B-mesons. [...]
arXiv:1212.0301; IFIC-12-80; FTUAM-12-113; IFT-UAM-CSIC-12-111; RM3-TH-12-20; LTH966; CERN-PH-TH-2012-328; IFIC-12-80; FTUAM-12-113; IFT-UAM-CSIC-12-111; RM3-TH-12-20; LTH966; CERN-PH-TH-2012-328.-
2013 - 6 p.
- Published in : PoS ICHEP2012 (2012) 428
Fulltext: ICHEP2012_428 - PDF; arXiv:1212.0301 - PDF; External link: Proceedings of Science Server
In : 36th International Conference on High Energy Physics, Melbourne, Australia, 4 - 11 Jul 2012, pp.428
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Renormalisation of quark bilinears with Nf=2 Wilson fermions and tree-level improved gauge action
/ Dimopoulos, P. (Rome U., Tor Vergata ; INFN, Rome2) ; Frezzotti, R. (Rome U., Tor Vergata ; INFN, Rome2) ; Herdoiza, G. (Rome U., Tor Vergata ; INFN, Rome2) ; Vladikas, A. (Rome U., Tor Vergata ; INFN, Rome2) ; Lubicz, V. (Rome III U. ; INFN, Rome3) ; Simula, S. (Rome III U. ; INFN, Rome3) ; Papinutto, M. (CERN)
We present results for the renormalisation constants of bilinear quark operators, using the Nf=2 twisted mass Wilson action at maximal twist (which guarantees automatic O(a) improvement) and the tree-level Symanzik improved gauge action. The scale-independent renormalisation constants are computed with a new method, which makes use of both standard twisted mass and Osterwalder-Seiler fermions. [...]
arXiv:0710.0975.-
2007 - 7 p.
- Published in : PoS LATTICE 2007 (2007) 241
Fulltext: arXiv:0710.0975 - PDF; LATTICE 2007_241 - PDF; Published version from PoS: PDF; External links: Proceedings of Science Server; Proceedings of Science Server
In : 25th International Symposium on Lattice Field Theory, Regensburg, Germany, 30 Jul - 4 Aug 2007, pp.241
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Light quark masses and pseudoscalar decay constants from $N_f = 2$ Lattice QCD with twisted mass fermions
/ ETM Collaboration
We present the results of a lattice QCD calculation of the average up-down and strange quark masses and of the light meson pseudoscalar decay constants with Nf=2 dynamical fermions. The simulation is carried out at a single value of the lattice spacing with the twisted mass fermionic action at maximal twist, which guarantees automatic O(a)-improvement of the physical quantities. [...]
arXiv:0709.4574; DESY-07-148; FTUV-07-2709; IFIC-07-57; MS-TP-07-23; RM3-TH-07-11; ROM2F-2007-16; SFB-CPP-07-58; TUM-HEP-676-07; DESY 07-148; FTUV-07-2709; IFIC-07-57; MS-TP-07-23; RM3-TH-07-11; ROM2F-2007-16; SFB-CPP-07-58; TUM-HEP-676-07.-
2008 - 20 p.
- Published in : JHEP 04 (2008) 020
Fulltext: arXiv:0709.4574 - PDF; JHEP04(2008)020 - PDF; SISSA/IOP Open Access article: PDF; External link: Fulltext
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A lattice approach to QCD in the chiral regime
/ Della Morte, M ; Frezzotti, R ; Heitger, J
Non-perturbative lattice studies of QCD in the chiral thermodynamic regime, where chiral symmetry is spontaneously broken, require to deal with almost quark zero modes in a theoretically clean and computationally efficient way. We discuss the basic features and some realistic tests of a formulation, known as lattice tmQCD, that fulfills these requirements [...]
hep-lat/0111048; BICOCCA-FT-2001-25; MS-TP-2001-16.-
Milano : Milano-Bicocca Univ. Phys. Dept., 2001 - 11 p.
- Published in : PoS hep2001 (2001) 219
Access to fulltext document: PDF; Published version from PoS: PDF; External link: hep-lat/0111048 PDF
In : International Europhysics Conference on High-Energy Physics, Budapest, Hungary, 12 - 18 Jul 2001, pp.219
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First results on the running coupling in QCD with two massless flavours
/ Bode, A ; Frezzotti, R ; Gehrmann, B ; Hasenbusch, M ; Heitger, J ; Jansen, K ; Kurth, S ; Rolf, J ; Simma, H ; Sint, S et al.
hep-lat/0105003; BICOCCA-FT-2001-12; CERN-TH-2001-120; DESY-01-052; DESY-2001-052; HU-EP-2001-16; LTH-501; MPI-PHT-2001-12; MS-TP-2001-2.-
Milano : Milano-Bicocca Univ. Phys. Dept., 2001 - 14 p.
- Published in : Phys. Lett. B 515 (2001) 49-56
Access to fulltext document: PDF; External link: hep-lat/0105003 PDF
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