Publications (50)
Monitoring the Bragg peak location of 73 MeV/u carbon ions by means of prompt -ray measurements
E. Testa, M. Bajard, M. Chevallier +7
By means of a time-of-flight technique, we measured the longitudinal profile of prompt -rays emitted by 73 MeV/u C ions irradiating a PMMA target. This technique allowed…
Non-Perturbative Renormalisation and Kaon Physics
M. Testa
A general review is presented on the problem of non perturbative computation of the transition amplitude.
On the color structure of Yang-Mills theory with static sources in a periodic box
L. Giusti, A. L. Guerrieri, S. Petrarca +2
We present an exploratory numerical study on the lattice of the color structure of the wave functionals of the SU(3) Yang-Mills theory in the presence of a static pair. I…
Topological susceptibility in full QCD with Ginsparg-Wilson fermions
L. Giusti, G. C. Rossi, M. Testa
We show that, if the formula for the topological charge density operator suggested by fermions obeying the Ginsparg-Wilson relation is employed, it is possible to give a precise an…
The U_A(1) Problem on the Lattice with Ginsparg-Wilson Fermions
L. Giusti, G. C. Rossi, M. Testa +1
We show how it is possible to give a precise and unambiguous implementation of the Witten--Veneziano formula for the eta' mass on the lattice, which looks like the formal continuum…
On the Definition of Gauge Field Operators in Lattice Gauge-Fixed Theories
L. Giusti, M. L. Paciello, S. Petrarca +2
We address the problem of defining the gluon field on the lattice in terms of the natural link variables. Different regularized definitions are shown, through non perturbative nume…
Precise measurements of the eta and the neutral kaon meson masses with the KLOE detector
F. Ambrosino, A. Antonelli, M. Antonelli +73
We present precise measurements of the eta and K0 masses using the processes phi to eta gamma, eta to gamma gamma and phi to Ks Kl, Ks to pi+ pi-. The K0 mass measurement, M_K=497.…
Study of the process e+e- -> omega p0 with the KLOE detector
KLOE collaboration, F. Ambrosino, A. Antonelli +81
Using ~600 pb-1 collected with the KLOE detector at DAPhiNE, we have studied the production cross section of pi+ pi- pi0 pi0 and p0p0 gamma final states in e+e- collisions at cente…
-potential: a critical reappraisal
G. C. Rossi, M. Testa
We show how it is possible to define and compute the potential between and external sources in the singlet and octet (adjoint) representation of the colour group.
Measurement of the absolute branching ratio of the K+ -> pi+ pi0 (gamma) decay with the KLOE detector
F. Ambrosino, A. Antonelli, M. Antonelli +75
We have measured the absolute branching ratio of the K+ -> pi+ pi0 (gamma) decay, using about 20 million tagged K+ mesons collected with the KLOE detector at DAFNE, the Frascati ph…
Study of the a_0(980) meson via the radiative decay phi->eta pi^0 gamma with the KLOE detector
KLOE Collaboration, F. Ambrosino, A. Antonelli +75
We have studied the phi->a_0(980) gamma process with the KLOE detector at the Frascati phi-factory DAPhNE by detecting the phi->eta pi^0 gamma decays in the final states with eta->…
Decays in a Finite Volume
C. -J. D. Lin, G. Martinelli, C. T. Sachrajda +1
We discuss finite-volume computations of two-body hadronic decays below the inelastic threshold (e.g. decays). The relation between finite-volume matrix elements and phy…
Thin single-crystal perovskite detector for high-energy charged particles
Z. Chubinidze, M. Auf der Maur, F. Matteocci +9
The organometal halide perovskites (OMHP) semi-conductors have shown recently a strong potential as radiation detectors, beside the well-known success in photovoltaics and as photo…
Finite Volume Effects in Weak Hadronic Decays
C. -J. D. Lin, G. Martinelli, C. T. Sachrajda +1
In this talk we discuss finite-volume computations of two-body hadronic decays below the inelastic threshold (e.g. decays). In particular we show how the relation betwee…
-potential: a numerical study
A. L. Guerrieri, S. Petrarca, A. Rubeo +1
We report the results of recent lattice simulations aimed at computing the and potential energies in the singlet and the octet (adjoint) representation.
Measurement of the slope parameter αfor the η\to 3Ï^0 decay at KLOE
KLOE collaboration, F. Ambrosino, A. Antonelli +80
We report a preliminary measurement of the slope parameter for the $η\to 3\piz$ decay carried out with KLOE at DANE; where is the parameter describing the energy dep…
Getting the Lorentz transformations without requiring an invariant speed
A. Pelissetto, M. Testa
The structure of the Lorentz transformations follows purely from the absence of privileged inertial reference frames and the group structure (closure under composition) of the tran…
Non-perturbative improvement of lattice QCD at large momenta
G. Martinelli, G. C. Rossi, C. T. Sachrajda +3
We propose a method to improve lattice operators composed of Wilson fermions which allows the removal of all corrections of , including those proportional to the quark mass.…
Non-perturbative renormalization in kaon decays
A. Donini, V. Giménez, G. Martinelli +4
We discuss the application of the MPSTV non-perturbative method \cite{NPM} to the operators relevant to kaon decays. This enables us to reappraise the long-standing question of the…
Measurement of the branching ratio and search for a CP violating asymmetry in the eta -> pi+pi-e+e-(gamma) decay at KLOE
KLOE Collaboration, F. Ambrosino, A. Antonelli +57
We have studied the eta->pi+pi-e+e-(gamma) decay using about 1.7 fb^-1 collected by the KLOE experiment at the DAFNE phi-factory. This corresponds to about 72 millions eta mesons p…
Exploring the Light-Cone through Semi-Inclusive Hadronic Distributions
M. Testa
Light-cone dominance is established for a particular set of semi-inclusive observables in hadronic annihilation. This allows to deduce, with a certain degree of rigor, th…
The Problem on the Lattice
L. Giusti, G. C. Rossi, M. Testa +1
If the expression of the topological charge density operator, suggested by fermions obeying the Ginsparg--Wilson relation, is employed, it is possible to prove on the lattice the v…
On the Definition of Gauge Field Operators in Lattice Gauge-Fixed Theories
L. Giusti, M. L. Paciello, S. Petrarca +2
We address the problem of defining the gauge four-potential on the lattice, in terms of the natural link variables. Different regularized definitions are shown, through non perturb…
Search for the decay phi -> K0 K0bar gamma with the KLOE experiment
KLOE Collaboration, F. Ambrosino, A. Antonelli +54
We have searched for the decay phi -> K0 K0bar gamma, by detecting K_s pairs plus a photon and with the K_s-mesons decaying to pi^+ pi^-, in a sample of about 1.5x 10^9 phi-decays…
eta Physics and phi Radiative Decays at Kloe
F. Ambrosino, A. Antonelli, M. Antonelli +78
Here we present KLOE results on the phi meson decays in pi0 pi0 gamma, pi+ pi- gamma and eta pi0 gamma, the measurement of the ratio Br(phi to eta' gamma)/Br(phi to eta gamma) with…
A General Method for Non-Perturbative Renormalization of Lattice Operators
G. Martinelli, C. Pittori, C. T. Sachrajda +2
We propose a non-perturbative method for computing the renormalization constants of generic composite operators. This method is intended to reduce some systematic errors, which are…
Investigation on uncertain RRab variable stars from ASAS-SN catalogue
C. Barsanti, A. Bonelli, M. Bruno +6
An analysis of a group of seven variables stars, classed by ASAS-SN as uncertain RRab, is performed comparing their position in a H-R diagram with respect to a sample of variables…
Results from a Non-Perturbative Renormalization of Lattice Operators
G. Martinelli, C. Pittori, C. T. Sachrajda +2
We propose a general renormalization method, which avoids completely the use of lattice perturbation theory. We present the results from its numerical applications to two-fermion o…
Recent results from KLOE experiment
KLOE collaboration, F. Ambrosino, A. Antonelli +76
We report the newest results from the KLOE experiment on hadronic physics, such as the parameters of scalars f0 and a0, the eta meson mass measurements and dynamics, the first obse…
Higgs Physics at the HL-LHC and HE-LHC
M. Cepeda, S. Gori, P. Ilten +374
The discovery of the Higgs boson in 2012, by the ATLAS and CMS experiments, was a success achieved with only a percent of the entire dataset foreseen for the LHC. It opened a lands…
Lattice Gauge Fixing, Gribov Copies and BRST Symmetry
M. Testa
We show that a modification of the BRST lattice quantization allows to circumvent an old paradox, formulated by Neuberger, related to lattice Gribov copies and non-perturbative BRS…
Non-perturbative improvement of composite operators with Wilson fermions
G. Martinelli, G. C. Rossi, C. T. Sachrajda +3
We propose a method to improve lattice operators composed of Wilson fermions which allows the removal of all corrections of , including those proportional to the quark mass,…
A global fit to determine the pseudoscalar mixing angle and the gluonium content of the eta' meson
F. Ambrosino, A. Antonelli, M. Antonelli +54
We update the values of the eta-eta' mixing angle and of the eta' gluonium content by fitting our measurement R_phi = BR(phi to eta' gamma)/ BR(phi to eta gamma) together with seve…
Determination of the η\toÏ^+Ï^-Ï^0 Dalitz Plot slopes and asymmetries with the KLOE detector
KLOE collaboration, F. Ambrosino, A. Antonelli +80
We have studied, with the KLOE detector at the DANE -Factory, the dynamics of the decay using data from the radiative decay for an integrate…
Quark Masses and Renormalization Constants from Quark Propagator and 3-point Functions
D. Becirevic, V. Lubicz, G. Martinelli +1
We have computed the light and strange quark masses and the renormalization constants of the quark bilinear operators, by studying the large-p^2 behaviour of the lattice quark prop…
Non-perturbative improvement of operators with Wilson fermions
C. Dawson, G. Martinelli, G. C. Rossi +4
We outline two methods of constructing improved composite operators using Wilson fermions.
Charged kaon lifetime at KLOE
F. Ambrosino, A. Antonelli, M. Antonelli +79
Preliminary result on the charged kaon lifetime, obtained by the KLOE experiment operating at DANE, the Frascati -factory, is presented
On the Geometry of Surface Stress
G. C. Rossi, M. Testa
We present a fully general derivation of the Laplace--Young formula and discuss the interplay between the intrinsic surface geometry and the extrinsic one ensuing from the immersio…
Some Observations on Broken Symmetries
M. Testa
We present a general analysis of the field theoretical properties which guarantee the recovery, at the renormalized level, of symmetries broken by regularization. We also discuss t…
Determination of Dalitz plot slopes and asymmetries with the KLOE detector
The KLOE collaboration, F. Ambrosino, A. Antonelli +76
We have studied, with the KLOE detector at the DANE -Factory, the dynamics of the decay using mesons from the decay for an integrated l…
Measurement of the charged kaon lifetime with the KLOE detector
F. Ambrosino, A. Antonelli, M. Antonelli +73
We have measured the charged kaon lifetime using a sample of 15 \times 10^6 tagged kaon decays. Charged kaons were produced in pairs at the DA\PhiNE Ï-factory, e^+e^- \to Ï\to K^…
New lattice approaches to the rule
C. Dawson, G. Martinelli, G. C. Rossi +4
Lattice QCD should allow a derivation of the rule from first principles, but numerical calculations to date have been plagued by a variety of problems. After a brief revi…
Note on lattice regularization and equal-time correlators for parton distribution functions
G. C. Rossi, M. Testa
We show that a recent interesting idea to circumvent the difficulties with the continuation of parton distribution functions to the Euclidean region, that consists in looking at eq…
Causality in Local Quantum Field Theory
L. Maiani, M. Testa
The problem of causality is analyzed in the context of Local Quantum Field Theory. Contrary to recent claims, it is shown that apparent noncausal behaviour is due to a lack of the…
QED Corrections to Hadronic Processes in Lattice QCD
N. Carrasco, V. Lubicz, G. Martinelli +4
In this paper, for the first time a method is proposed to compute electromagnetic effects in hadronic processes using lattice simulations. The method can be applied, for example, t…
A Lattice Study of the Gluon Propagator in the Landau Gauge
P. Marenzoni, G. Martinelli, N. Stella +1
We present the results of two high-statistics studies of the gluon propagator in the Landau gauge, at , on different lattice volumes. The dependence of the propagator on th…
Vus and lepton universality from kaon decays with the KLOE detector
F. Ambrosino, A. Antonelli, M. Antonelli +76
KLOE has measured most decay branching ratios of Ks, Kl and K+/- mesons. It has also measured the Kl and the K+- lifetime and determined the shape of the form factors involved in k…
Study of the process e+e- -> omega pi0 in the phi-meson mass region with the KLOE detector
The KLOE Collaboration, F. Ambrosino, A. Antonelli +62
We have studied the e+e- -> omegapi0 cross section in the sqrt(s) interval 1000-1030 MeV using the pi+pi-pi0pi0 and pi0pi0gamma final states with a sample of ~600 pb^-1 collected w…
Unstable Systems in Relativistic Quantum Field Theory
L. Maiani, M. Testa
We show how the state of an unstable particle can be defined in terms of stable asymptotic states. This general definition is used to discuss and to solve some old problems connect…
Search for the K_S -> e+e- decay with the KLOE detector
The KLOE Collaboration, F. Ambrosino, A. Antonelli +63
We present the result of a direct search for the decay K_S -> e+e-, obtained with a sample of e+e- -> phi -> K_S K_L events produced at DAFNE, the Frascati phi-factory, for an inte…