Publications (119)
Wilson fermions with chirally twisted mass
R. Frezzotti
Lattice formulations of QCD with Wilson fermions and a chirally twisted quark mass matrix provide an attractive framework for non-perturbative numerical studies. Owing to reparamet…
Ratio of kaon and pion leptonic decay constants with Wilson-clover twisted-mass fermions
C. Alexandrou, S. Bacchio, G. Bergner +12
We present a determination of the ratio of kaon and pion leptonic decay constants in isosymmetric QCD (isoQCD), , making use of the gauge ensembles produced by the Exte…
Renormalisation of quark bilinears with Nf=2 Wilson fermions and tree-level improved gauge action
P. Dimopoulos, R. Frezzotti, G. Herdoiza +4
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) improv…
Lattice calculation of the meson radiative form factors over the full kinematical range
R. Frezzotti, G. Gagliardi, V. Lubicz +6
We compute the structure-dependent axial and vector form factors for the radiative leptonic decays , where is a charged lepton, as functions of the ene…
Pseudoscalar decay constants , and with ETMC configurations
P. Dimopoulos, R. Frezzotti, P. Lami +7
We present a lattice QCD calculation of the pseudoscalar decay constants , and performed by the European Twisted Mass Collaboration with dyna…
A first look at maximally twisted mass lattice QCD calculations at the physical point
A. Abdel-Rehim, Ph. Boucaud, N. Carrasco +15
In this contribution, a first look at simulations using maximally twisted mass Wilson fermions at the physical point is presented. A lattice action including clover and twisted mas…
Scaling and low energy constants in lattice QCD with N_f=2 maximally twisted Wilson quarks
ETM Collaboration, P. Dimopoulos, R. Frezzotti +3
We report on the scaling of basic hadronic observables in lattice QCD with N_f=2 maximally twisted Wilson dynamical quarks. We give preliminary results for some of the Gasser-Leutw…
Neutral meson oscillations in the Standard Model and beyond from Nf=2 Twisted Mass Lattice QCD
N. Carrasco, P. Dimopoulos, R. Frezzotti +11
We present the ETMC results for the bag parameters describing the neutral kaon mixing in the Standard Model and beyond and preliminary results for the bag parameters controlling th…
K -> pi matrix elements of the chromagnetic operator on the lattice
M. Constantinou, M. Costa, R. Frezzotti +5
We present preliminary results of the first lattice QCD calculation of the K -> pi matrix elements of the chromomagnetic operator O_{CM}=g sbar sigma_{munu} G_{munu} d, which appea…
Quark masses using twisted mass fermion gauge ensembles
C. Alexandrou, S. Bacchio, G. Bergner +24
We present a calculation of the up, down, strange and charm quark masses performed within the lattice QCD framework. We use the twisted mass fermion action and carry out simulation…
Evidence for eta prime - pion splitting in unquenched lattice QCD
R. Frezzotti, M. Masetti, R. Petronzio
We perform an extrapolation from negative to positive flavour numbers of full QCD lattice estimates of the mass. The extrapolations are carried out by keeping and m…
Theoretical framework for lattice QCD computations of and decays rates, including contributions from charming penguin diagrams
R. Frezzotti, G. Gagliardi, V. Lubicz +6
We develop a strategy for computing the and decay amplitudes using lattice QCD (where are charged leptons). We focus on…
Lattice QCD determination of m_b, f_B and f_Bs with twisted mass Wilson fermions
ETM Collaboration, P. Dimopoulos, R. Frezzotti +10
We present a lattice QCD determination of the b quark mass and of the B and B_s decay constants, performed with N_f=2 twisted mass Wilson fermions, by simulating at four values of…
Quenched twisted mass QCD at small quark masses and in large volume
M. Della Morte, R. Frezzotti, J. Heitger
As a test of quenched lattice twisted mass QCD, we compute the non-perturbatively O() improved pseudoscalar and vector meson masses and the pseudoscalar decay constant down to $…
Chirally improving Wilson fermions II. Four-quark operators
R. Frezzotti, G. C. Rossi
In this paper we discuss how the peculiar properties of twisted lattice QCD at maximal twist can be employed to set up a consistent computational scheme in which, despite the expli…
Average up/down, strange and charm quark masses with Nf=2 twisted mass lattice QCD
ETM Collaboration, B. Blossier, P. Dimopoulos +6
We present a high precision lattice calculation of the average up/down, strange and charm quark masses performed with Nf=2 twisted mass Wilson fermions. The analysis includes data…
Time windows of the muon HVP from twisted-mass lattice QCD
C. Alexandrou, S. Bacchio, P. Dimopoulos +13
We present a lattice determination of the leading-order hadronic vacuum polarization (HVP) contribution to the muon anomalous magnetic moment, , in the so-called sh…
Isospin breaking effects due to the up-down mass difference in Lattice QCD
G. M. de Divitiis, P. Dimopoulos, R. Frezzotti +8
We present a new method to evaluate with high precision isospin breaking effects due to the small mass difference between the up and down quarks using lattice QCD. Our proposal is…
f_B and f_Bs with maximally twisted Wilson fermions
ETM Collaboration, B. Blossier, P. Dimopoulos +13
We present a lattice QCD calculation of the heavy-light decay constants f_B and f_Bs performed with Nf=2 maximally twisted Wilson fermions, at four values of the lattice spacing. T…
Complete lattice QCD calculation of form factors
R. Di Palma, R. Frezzotti, G. Gagliardi +6
We present the first complete lattice QCD calculation of the four structure-dependent form factors governing the rare charged kaon decay $K^- \to \ell^- \barν_\ell \ell'^+ \ell'^-…
- and -meson leptonic decay constants with physical light, strange and charm quarks by ETMC
P. Dimopoulos, R. Frezzotti, M. Garofalo +1
We present a lattice QCD computation and preliminary results for the leptonic decay constants of the pseudoscalar mesons , and in the isosymmetric QCD limit. The com…
Dynamical Twisted Mass Fermions with Light Quarks: Simulation and Analysis Details
Ph. Boucaud, P. Dimopoulos, F. Farchioni +16
In a recent paper [hep-lat/0701012] we presented precise lattice QCD results of our European Twisted Mass Collaboration (ETMC). They were obtained by employing two mass-degenerate…
Renormalisation constants of quark bilinears in lattice QCD with four dynamical Wilson quarks
B. Blossier, M. Brinet, N. Carrasco +17
We present preliminary results of the non-perturbative computation of the RI-MOM renormalisation constants in a mass-independent scheme for the action with Iwasaki glue and four dy…
Lattice calculation of the short and intermediate time-distance hadronic vacuum polarization contributions to the muon magnetic moment using twisted-mass fermions
C. Alexandrou, S. Bacchio, P. Dimopoulos +13
We present a lattice determination of the leading-order hadronic vacuum polarization (HVP) contribution to the muon anomalous magnetic moment, , in the so-called sh…
The pion vector form factor from Lattice QCD at the physical point
C. Alexandrou, S. Bacchio, P. Dimopoulos +9
We present an investigation of the electromagnetic pion form factor, , at small values of the four-momentum transfer ( GeV), based on the gauge…
Up, down, strange and charm quark masses with Nf = 2+1+1 twisted mass lattice QCD
N. Carrasco, A. Deuzeman, P. Dimopoulos +16
We present a lattice QCD calculation of the up, down, strange and charm quark masses performed using the gauge configurations produced by the European Twisted Mass Collaboration wi…
Real photon emissions in leptonic decays
G. M. de Divitiis, A. Desiderio, M. Di Carlo +11
We present a non-perturbative calculation of the form factors which contribute to the amplitudes for the radiative decays , where is a pseudoscalar m…
The decay rate at large from lattice QCD
R. Frezzotti, G. Gagliardi, V. Lubicz +5
We determine, by means of lattice QCD calculations, the local form factors describing the decay. For this analysis we make use of the gauge configurations…
Status of APEmille
APE-Collaboration, :, A. Bartoloni +31
This paper presents the status of the APEmille project, which is essentially completed, as far as machine development and construction is concerned. Several large installations of…
The PHMC algorithm for simulations of dynamical fermions: I -- description and properties
R. Frezzotti, K. Jansen
We give a detailed description of the so-called Polynomial Hybrid Monte Carlo (PHMC) algorithm. The effects of the correction factor, which is introduced to render the algorithm ex…
B-physics computations from Nf=2 tmQCD
N. Carrasco, M. Ciuchini, P. Dimopoulos +12
We present an accurate lattice QCD computation of the b-quark mass, the B and Bs decay constants, the B-mixing bag-parameters for the full four-fermion operator basis, as well as e…
K^0-\bar{K}^0 Mixing Beyond the SM from Nf=2 tmQCD
ETM Collaboration, P. Dimopoulos, R. Frezzotti +8
We present preliminary results on the of neutral kaon oscillations in extensions of the Standard Model. Using Nf=2 maximally twisted sea quarks and Osterwalder-Seiler valence quark…
A "twisted" determination of the -quark mass, and
N. Carrasco, P. Dimopoulos, R. Frezzotti +9
We present a lattice QCD determination of the -quark mass and of the and decay constants performed with twisted mass Wilson fermions. We have u…
B-physics from lattice QCD...with a twist
N. Carrasco, P. Dimopoulos, R. Frezzotti +11
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…
Non-perturbative renormalization of quark bilinear operators with Nf=2 (tmQCD) Wilson fermions and the tree-level improved gauge action
M. Constantinou, P. Dimopoulos, R. Frezzotti +8
We present results for the renormalization constants of bilinear quark operators obtained by using the tree-level Symanzik improved gauge action and the Nf=2 twisted mass fermion a…
Electromagnetic form factor of the pion from twisted-mass lattice QCD at Nf=2
R. Frezzotti, V. Lubicz, S. Simula
We present a lattice calculation of the electromagnetic form factor of the pion obtained using the tree-level Symanzik improved gauge action with two flavors of dynamical twisted W…
Mass of the b-quark and B-decay constants from Nf=2+1+1 twisted-mass Lattice QCD
ETM Collaboration, A. Bussone, N. Carrasco +9
We present precise lattice computations for the b-quark mass, the quark mass ratios mb/mc and mb/ms as well as the leptonic B-decay constants. We employ gauge configurations with f…
The bermions: an approach to lattice QCD dynamical fermions from negative flavour numbers
G. M. de Divitiis, R. Frezzotti, M. Guagnelli +2
We estimate the effects of dynamical fermions by extrapolating to positive flavour numbers the results from negative values obtained by adding to the pure gauge sector a fermion ac…
Leading isospin breaking effects on the lattice
G. M. de Divitiis, R. Frezzotti, V. Lubicz +6
We present a method to evaluate on the lattice the leading isospin breaking effects due to both the small mass difference between the up and down quarks and the QED interaction. Ou…
First lattice calculation of radiative leptonic decay rates of pseudoscalar mesons
A. Desiderio, R. Frezzotti, M. Garofalo +8
We present a non-perturbative lattice calculation of the form factors which contribute to the amplitudes for the radiative decays , where is a pseudo…
B-physics from Nf=2 tmQCD: the Standard Model and beyond
N. Carrasco, M. Ciuchini, P. Dimopoulos +12
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 determinati…
Light quark masses and pseudoscalar decay constants from Nf=2 Lattice QCD with twisted mass fermions
B. Blossier, Ph. Boucaud, P. Dimopoulos +15
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…
Cutoff effects in twisted mass lattice QCD
M. Della Morte, R. Frezzotti, J. Heitger +1
We present a first numerical study of lattice QCD with O(a) improved Wilson quarks and a chirally twisted mass term. Renormalized correlation functions are derived from the Schroed…
Nucleon and pion structure with lattice QCD simulations at physical value of the pion mass
A. Abdel-Rehim, C. Alexandrou, M. Constantinou +12
We present results on the nucleon scalar, axial and tensor charges as well as on the momentum fraction, and the helicity and transversity moments. The pion momentum fraction is als…
Dynamical flavour dependence of static heavy meson decay constants on the lattice
G. M. de Divitiis, R. Frezzotti, M. Masetti +1
We study the dynamical flavour dependence of the lattice estimates of the heavy meson decay constant in the static limit. We perform the analysis by considering negative flavour nu…
matrix elements of the chromomagnetic operator on the lattice
M. Constantinou, M. Costa, R. Frezzotti +5
We present the results of the first lattice QCD calculation of the matrix elements of the chromomagnetic operator , which app…
The APENEXT project
F. Bodin, P. Boucaud, N. Cabibbo +31
APENEXT is a new generation APE processor, optimized for LGT simulations. The project follows the basic ideas of previous APE machines and develops simple and cheap parallel system…
Chirally improving Wilson fermions
R. Frezzotti, G. C. Rossi
It is possible to improve the chiral behaviour and the approach to the continuum limit of correlation functions in lattice QCD with standard and twisted Wilson fermions by taking a…
Kaon oscillations in the Standard Model and Beyond using Nf=2 dynamical quarks
V. Bertone, P. Dimopoulos, R. Frezzotti +8
We compute non-perturbatively the B-parameters of the complete basis of four-fermion operators needed to study the Kaon oscillations in the SM and in its supersymmetric extension.…
Computation of the improvement coefficient to 1-loop with improved gluon actions
S. Aoki, R. Frezzotti, P. Weisz
The clover coefficient $\csw$ is computed at one loop order of perturbation theory for improved gluon actions including six-link loops. The O(a) improvement coefficients for the di…
First moments of the nucleon transverse quark spin densities using lattice QCD
C. Alexandrou, S. Bacchio, M. Constantinou +9
We present a calculation of the Mellin moments of the transverse quark spin densities in the nucleon using lattice QCD. The densities are extracted from the unpolarized and transve…
BK-parameter from Nf = 2 twisted mass lattice QCD
ETM Collaboration, M. Constantinou, P. Dimopoulos +12
We present an unquenched lattice computation of the parameter which controls oscillations. A partially quenched setup is employed with two maximally…
Lattice QCD study of the decay
D. BeÄireviÄ, R. Di Palma, R. Frezzotti +4
We present the results of our lattice QCD computation of the electric () and magnetic form factors relevant to the decay by using the gauge f…
Strange and charm quark contributions to the muon anomalous magnetic moment in lattice QCD with twisted-mass fermions
C. Alexandrou, S. Bacchio, A. De Santis +15
We present a lattice calculation of the Hadronic Vacuum Polarization (HVP) contribution of the strange and charm quarks to the anomalous magnetic moment of the muon in isospin symm…
Isospin-0 scattering from twisted mass lattice QCD
L. Liu, S. Bacchio, P. Dimopoulos +11
We present results for the isospin-0 s-wave scattering length calculated in twisted mass lattice QCD. We use three ensembles with unitary pion mass at its physical…
Spectral-function determination of complex electroweak amplitudes with lattice QCD
R. Frezzotti, G. Gagliardi, V. Lubicz +3
We present a novel method to determine on the lattice both the real and imaginary parts of complex electroweak amplitudes involving two external currents and a single hadron or the…
Twisted mass quarks and the phase structure of lattice QCD
F. Farchioni, R. Frezzotti, K. Jansen +7
The phase structure of zero temperature twisted mass lattice QCD is investigated. We find strong metastabilities in the plaquette observable when the untwisted quark mass assumes p…
Comparison of lattice QCD+QED predictions for radiative leptonic decays of light mesons with experimental data
R. Frezzotti, M. Garofalo, V. Lubicz +5
We present a comparison of existing experimental data for the radiative leptonic decays , where or and or , from the KLOE, PIBETA, E787,…
The chromomagnetic operator on the lattice
M. Constantinou, M. Costa, R. Frezzotti +5
We present our study of the renormalization of the chromomagnetic operator,O(CM), which appears in the effective Hamiltonian describing Delta S = 1 transitions in and beyond the St…
Inclusive hadronic decay rate of the lepton from lattice QCD: the flavour channel and the Cabibbo angle
C. Alexandrou, S. Bacchio, A. De Santis +13
We present a lattice determination of the inclusive decay rate of the process in which the lepton decays into a generic hadronic state with $…
First Physics Results at the Physical Pion Mass from Wilson Twisted Mass Fermions at Maximal Twist
ETM Collaboration, A. Abdel-Rehim, C. Alexandrou +20
We present physics results from simulations of QCD using dynamical Wilson twisted mass fermions at the physical value of the pion mass. These simulations were enabled by…
Leptonic decay constants fK, fD and fDs with Nf = 2+1+1 twisted-mass lattice QCD
N. Carrasco, P. Dimopoulos, R. Frezzotti +9
We present a lattice QCD calculation of the pseudoscalar decay constants fK, fD and fDs performed using the gauge configurations produced by the European Twisted Mass Collaboration…
Moments of nucleon generalized parton distributions from lattice QCD simulations at physical pion mass
C. Alexandrou, S. Bacchio, M. Constantinou +9
We present results for the moments of nucleon isovector vector and axial generalised parton distribution functions computed within lattice QCD. Three ensembles of maximally twisted…
Pseudoscalar decay constants of kaon and D-mesons from Nf=2 twisted mass Lattice QCD
B. Blossier, P. Dimopoulos, R. Frezzotti +12
We present the results of a lattice QCD calculation of the pseudoscalar meson decay constants fpi, fK, fD and fDs, performed with Nf=2 dynamical fermions. The simulation is carried…
Twisted-mass lattice QCD with mass non-degenerate quarks
R. Frezzotti, G. C. Rossi
The maximally twisted lattice QCD action of an doublet of mass degenerate Wilson quarks gives rise to a real positive fermion determinant and it is invariant under the pr…
Kaon Mixing Beyond the SM from Nf=2 tmQCD and model independent constraints from the UTA
V. Bertone, N. Carrasco, M. Ciuchini +12
We present the first unquenched, continuum limit, lattice QCD results for the matrix elements of the operators describing neutral kaon oscillations in extensions of the Standard Mo…
Reducing cutoff effects in maximally twisted lattice QCD close to the chiral limit
R. Frezzotti, G. Martinelli, M. Papinutto +1
When analyzed in terms of the Symanzik expansion, lattice correlators of multi-local (gauge-invariant) operators with non-trivial continuum limit exhibit in maximally twisted latti…
Light Meson Physics from Maximally Twisted Mass Lattice QCD
R. Baron, Ph. Boucaud, P. Dimopoulos +16
We present a comprehensive investigation of light meson physics using maximally twisted mass fermions for two mass-degenerate quark flavours. By employing four values of the lattic…
Progress in Simulations with Twisted Mass Fermions at the Physical Point
A. Abdel-Rehim, C. Alexandrou, P. Dimopoulos +8
In this contribution, results from lattice QCD simulations at one lattice spacing using twisted mass fermions with a clover term at the physical pion mass are presented. Th…
O(a^2) cutoff effects in lattice Wilson fermion simulations
P. Dimopoulos, R. Frezzotti, C. Michael +2
In this paper we propose to interpret the large discretization artifacts affecting the neutral pion mass in maximally twisted lattice QCD simulations as O(a^2) effects whose magnit…
Non perturbative determination of the running coupling constant in quenched SU(2)
G. M. de Divitiis, R. Frezzotti, M. Guagnelli +1
Through a finite size renormalization group technique we calculate the running coupling constant for quenched SU(2) with a few percent error over a range of energy varying by a fac…
K-meson vector and tensor decay constants and BK-parameter from Nf=2 tmQCD
P. Dimopoulos, R. Frezzotti, V. Gimenez +5
We present work in progress on the computation of the K-meson vector and tensor decay constants, as well as the B-parameter in Kaon oscillations. Our simulations are performed in a…
Light baryon masses with dynamical twisted mass fermions
C. Alexandrou, R. Baron, B. Blossier +17
We present results on the mass of the nucleon and the Delta using two dynamical degenerate twisted mass quarks and the tree-level Symanzik improved gauge action. The evaluation is…
Non-perturbative scaling tests of twisted mass QCD
M. Della Morte, R. Frezzotti, J. Heitger +1
We present a scaling study of lattice QCD with O(a) improved Wilson fermions and a chirally twisted mass term. In order to get precise results with a moderate computational effort,…
QCD at finite temperature and partially negative flavour numbers
G. M. de Divitiis, R. Frezzotti, M. Masetti +1
We study dynamical fermion effects in lattice QCD at finite temperature. The method adopted is basically the extrapolation from negative flavour numbers already tested at zero temp…
A non-perturbative mechanism for elementary particle mass generation
R. Frezzotti, G. C. Rossi
Taking inspiration from lattice QCD data, we argue that a finite non-perturbative contribution to the quark mass is generated as a consequence of the dynamical phenomenon of sponta…
ÎS=2 and ÎC=2 bag parameters in the SM and beyond from Nf=2+1+1 twisted-mass LQCD
N. Carrasco, P. Dimopoulos, R. Frezzotti +4
We present unquenched lattice QCD results for the matrix elements of four-fermion operators relevant to the description of the neutral K and D mixing in the Standard Model and its…
Recent results on the running coupling in QCD with two massless flavours
M. Della Morte, R. Frezzotti, J. Heitger +4
We report on the latest results on the running coupling of two flavour QCD in the Schrödinger functional scheme. Results for the step scaling function are obtained from simulation…
The PHMC algorithm for simulations of dynamical fermions: II - Performance analysis
R. Frezzotti, K. Jansen
We compare the performance of the PHMC algorithm with the one of the HMC algorithm in practical simulations of lattice QCD. We show that the PHMC algorithm can lead to an accelerat…
Quark masses with Nf=2 twisted mass lattice QCD
B. Blossier, P. Dimopoulos, R. Frezzotti +6
We present the results of the recent high precision lattice calculation of the average up/down, strange and charm quark masses performed by ETMC with Nf=2 twisted mass Wilson fermi…
Perturbative and non-perturbative renormalization results of the Chromomagnetic Operator on the Lattice
M. Constantinou, M. Costa, R. Frezzotti +5
The Chromomagnetic operator (CMO) mixes with a large number of operators under renormalization. We identify which operators can mix with the CMO, at the quantum level. Even in dime…
Chirally improving Wilson fermions - I. O(a) improvement
R. Frezzotti, G. C. Rossi
We show that it is possible to improve the chiral behaviour and the approach to the continuum limit of correlation functions in lattice QCD with Wilson fermions by taking arithmeti…
How the PHMC algorithm samples configuration space
R. Frezzotti, K. Jansen
We show that in practical simulations of lattice QCD with two dynamical light fermion species the PHMC algorithm samples configuration space differently from the commonly used HMC…
Rare kaon decays : Standard Model predictions from lattice QCD
R. Di Palma, R. Frezzotti, G. Gagliardi +6
Weak decays of charged kaons with an additional lepton-antilepton pair, (), are suppressed at order $O(G_{F}^{2}α_…
B-physics from the ratio method with Wilson twisted mass fermions
N. Carrasco, P. Dimopoulos, R. Frezzotti +10
We present a precise lattice QCD determination of the b-quark mass, of the B and Bs decay constants and first preliminary results for the B-mesons bag parameter. Simulations are pe…
K^0-\bar{K}^0 mixing in the Standard Model from Nf=2+1+1 Twisted Mass Lattice QCD
N. Carrasco, V. Gimenez, P. Dimopoulos +7
We present preliminary results at β = 1.95 (a = 0.077 fm) on the first unquenched N_f=2+1+1 lattice computation of the B_K parameter which controls the neutral kaon oscillations i…
Lattice calculation of the pion mass difference at order
R. Frezzotti, G. Gagliardi, V. Lubicz +3
We present a lattice calculation of the charged/neutral pion mass difference at order using the gauge configurations produced by the…
Rotated twisted-mass: a convenient regularization scheme for isospin breaking QCD and QED lattice calculations
R. Frezzotti, G. Gagliardi, V. Lubicz +2
We propose a scheme of lattice twisted-mass fermion regularization which is particularly convenient for application to isospin breaking (IB) QCD and QED calculations, based in part…
Light meson decay constants beyond the quenched approximation
G. M. de Divitiis, R. Frezzotti, M. Guagnelli +2
We calculate the effects of including dynamical fermion loops in the lattice QCD estimates of meson decay constants, by extrapolating the results from negative flavour numbers afte…
A proposal for B-physics on current lattices
ETM collaboration, B. Blossier, P. Dimopoulos +11
A method to extract B-physics parameters (b-quark mass and fB, fBs decay constants) from currently available lattice data is presented and tested. The approach is based on the idea…
Nucleon scalar and tensor charges using lattice QCD simulations at the physical value of the pion mass
C. Alexandrou, M. Constantinou, P. Dimopoulos +9
We present results on the light, strange and charm nucleon scalar and tensor charges from lattice QCD, using simulations with flavors of twisted mass Clover-improved fermio…
Lattice QCD Study of -meson Decay Constants from ETMC
A. Bussone, N. Carrasco, P. Dimopoulos +13
We discuss a lattice QCD computation of the -meson decay constants by the ETM collaboration where suitable ratios allow to reach the bottom quark sector by combining simulations…
Scaling and chiral extrapolation of pion mass and decay constant with maximally twisted mass QCD
P. Dimopoulos, R. Frezzotti, G. Herdoiza +3
We present an update of the results for pion mass and pion decay constant as obtained by the ETM collaboration in large scale simulations with maximally twisted mass fermions and t…
Dynamical Twisted Mass Fermions with Light Quarks
Ph. Boucaud, P. Dimopoulos, F. Farchioni +19
We present results of dynamical simulations with 2 flavours of degenerate Wilson twisted mass quarks at maximal twist in the range of pseudo scalar masses from 300 to 550 MeV. The…
A (P)HMC algorithm for N_f = 2 + 1 + 1 flavours of twisted mass fermions
T. Chiarappa, R. Frezzotti, C. Urbach
We present a detailed design of a (P)HMC simulation algorithm for N_f = 2 + 1 + 1 maximally twisted Wilson quark flavours. The algorithm retains even/odd and mass-shift preconditio…
A definition of the running coupling constant in a twisted SU(2) lattice gauge theory
G. M. de Divitiis, R. Frezzotti, M. Guagnelli +1
We propose a definition of the running coupling constant in a SU(2) lattice gauge theory with twisted boundary conditions. It is based on the correlation of Polyakov loops extended…
Lattice QCD determination of the radiative decay rates and
D. BeÄireviÄ, R. Di Palma, R. Frezzotti +4
We present the results of our lattice QCD computation of the hadronic matrix elements relevant to the and decays by using the gauge configur…
Renormalization constants for Wilson fermion lattice QCD with four dynamical flavours
P. Dimopoulos, R. Frezzotti, G. Herdoiza +4
We report on an ongoing non-perturbative computation of RI-MOM scheme renormalization constants for the lattice action with four dynamical flavours currently in use by ETMC. For th…
Lattice QCD at maximal twist
R. Frezzotti, G. C. Rossi
In this review we discuss the general features of maximally twisted lattice QCD. In particular, we illustrate how automatic O(a) improvement can be achieved and how it is possible…
Charmonium radiative transitions to dileptons from lattice QCD: The case of and
D. BeÄireviÄ, R. Di Palma, R. Frezzotti +4
We present a lattice QCD study of dilepton production in charmonium transitions, specifically focusing on the and processes: $h_c \to η_c \…