Photocouplings of nucleon resonances with gluon and pion exchange currents (2009)
Photocouplings for the nucleon resonances most relevant to total photoabsorption are calculated in a constituent quark model including gluon and pion exchange. The sensitivity ofthe results to the di...
Transverse-momentum distributions in a diquark spectator model (2008)
Bacchetta, A., Conti, F., Radici, M.
All the leading-twist parton distribution functions are calculated in a spectator model of the nucleon, using scalar and axial-vector diquarks. Single gluon rescattering is used to generate T-odd...
Parton fragmentation in the vacuum and in the medium (2008)
Albino, S., Anulli, F., Arleo, F., Besson, D., Brooks, W., Buschbeck, B., ...
We present the mini-proceedings of the workshop on ``Parton fragmentation in the vacuum and in the medium'' held at the European Centre for Theoretical Studies in Nuclear Physics and Related Areas...
Evolution Equations for Extended Dihadron Fragmentation Functions. (2007)
F.A. Ceccopieri, DESY Forschung Hochenergiephysik, M. Radici, A. Bacchetta
Journal article
Bianconi, A., Pasquini, B., Radici, M.
We have performed numerical simulations of the unpolarized e+e- --> p pbar process in kinematic conditions under discussion for a possible upgrade of the existing DAFNE facility. By fitting the cross...
Prospects for e+e- physics at Frascati between the phi and the psi (2006)
Ambrosino, F., Anulli, F., Babusci, D., Bianco, S., Bini, C., Brambilla, N., ...
We present a detailed study, done in the framework of the INFN 2006 Roadmap, of the prospects for e+e- physics at the Frascati National Laboratories. The physics case for an e+e- collider running at...
Modeling Dihadron Fragmentation Functions. (2006)
A. Bacchetta, DESY Forschung Hochenergiephysik, M. Radici
Journal article
Azimuthal asymmetries in unpolarized Drell-Yan events on nuclear targets (2005)
We show that for Drell-Yan events by unpolarized hadronic projectiles and nuclear targets, azimuthal asymmetries can arise from the nuclear distortion of the hadronic projectile wave function,...
The complete knowledge of the nucleon spin structure at leading twist requires also addressing the transverse spin distribution of quarks, or transversity, which is yet unexplored because of its...
A low-mass neutron flux monitor for the n _TOF facility at CERN (2004)
Mastinu,P. F., Abbondanno,U., Aerts,G., Alvarez,H., Andriamonje,S., Angelopoulos,A., ...
A small-mass system has been developed for monitoring the flux of neutrons with energy up to 1 MeV at the new time-of-flight facility at CERN, n_TOF. The monitor is based on a thin Mylar foil with a...
A low-mass neutron flux monitor for the n_TOF facility at CERN (2004)
Mastinu, P.F., Abbondanno, U., Aerts, G., Alvarez, H., Andriamonje, S., Angelopoulos, A., ...
Measurement of the n_TOF beam profile with a micromegas detector (2004)
Pancin, J., Abbondanno, U., Aerts, G., Alvarez, H., Andriamonje, S., Angelopoulos, A., ...
A low-mass neutron flux monitor for the n_TOF facility at CERN (2004)
Mastinu, P.F., Abbondanno, U., Aerts, G., Alvarez, H., Andriamonje, S., Angelopoulos, A., ...
Measurement of the n_TOF beam profile with a micromegas detector (2004)
Pancin, J., Abbondanno, U., Aerts, G., Alvarez, H., Andriamonje, S., Angelopoulos, A., ...
A review of the theoretical activity in Italy in the research field of Hadronic Physics is given. Specific focus is put on phenomenological models based on the effective degrees of freedom of...
Nucleon electromagnetic and axial form factors in point-form relativistic quantum mechanics (2002)
Wagenbrunn, R. F., Boffi, S., Glozman, L. Ya., Klink, W., Plessas, W., Radici, M.
Results for the proton and neutron electric and magnetic form factors as well as the nucleon axial form factor are presented for constituent quark models, based on either one-gluon-exchange and...
Addressing transversity with interference fragmentation functions (2002)
The class of interference fragmentation functions, arising from interference among different hadron production channels, is reconsidered. Their symmetry properties with respect to chiral...
Polynomiality of off-forward distribution functions in the chiral quark soliton model (2002)
Schweitzer, P., Boffi, S., Radici, M.
Mellin moments of off-forward distribution functions are, at t = 0, even polynomials of the skewedness parameter xi. It is proven that the unpolarized off-forward distribution functions in the chiral...
Schweitzer, P., Boffi, S., Radici, M.
Mellin moments of off-forward distribution functions are even polynomials of the skewedness parameter. This constraint, called polynomiality property, follows from Lorentz- and time-reversal...
Radici, M., Meucci, A., Dickhoff, W. H.
We analyze the unpolarized and polarized electron-induced proton-knockout reactions on $O^{16}$ in different kinematical settings using two theoretical approaches. The first one is based on a...
Electroweak properties of the nucleon in a chiral constituent quark model (2002)
Boffi, S., Radici, M., Glozman, L., Plessas, W., Wagenbrunn, R. F., Klink, W.
Results for all elastic electroweak nucleon form factors are presented for the chiral constituent quark model based on Goldstone-boson-exchange dynamics. The calculations are performed in a covariant...
Di Pastena, A, Schloderer, U, Delli Muti, M, Virtuoso, G, Radici, M, Celleno, D
No abstract available.
Accessing transversity with interference fragmentation functions (2001)
Radici, M., Jakob, R., Bianconi, A.
We discuss in detail the option to access the transversity distribution function $h_1(x)$ by utilizing the analyzing power of interference fragmentation functions in two-pion production inside the...
Covariant electroweak nucleon form factors in a chiral constituent quark model (2001)
Boffi, S., Glozman, L. Ya., Klink, W., Plessas, W., Radici, M., Wagenbrunn, R. F.
Results for the proton and neutron electric and magnetic form factors as well asthe nucleon axial and induced pseudoscalar form factors are presented for the chiral constituent quark model based on...
Relevance of high-momentum nucleons for nuclear phenomena (2001)
Dickhoff, W. H., Roth, E. P., Radici, M.
A brief review is given concerning the status of the theoretical work on nucleon spectral functions. A recent concern about the validity of the concept of spectroscopic factors as deduced from...
T-odd fragmentation functions (2001)
We discuss the properties of fragmentation functions arising from the interference of two leading hadrons produced inside the same jet in the current fragmentation region of a hard process. For the...
Interference fragmentation functions and spin asymmetries (2001)
A new class of fragmentation functions, arising from the interference of different hadron production channels, is analyzed. Their symmetry properties with respect to naive time-reversal...
Covariant axial form factor of the nucleon in a chiral constituent quark model (2001)
Glozman, L. Ya., Radici, M., Wagenbrunn, R. F., Boffi, S., Klink, W., Plessas, W.
The axial form factor G_A of the nucleon is investigated for the Goldstone-boson-exchange constituent quark model using the point-form approach to relativistic quantum mechanics. The results, being...
Electroweak properties of baryons in a covariant chiral quark model (2001)
Boffi, S., Radici, M., Glozman, L., Wagenbrunn, R. F., Plessas, W., Klink, W.
The proton and neutron electromagnetic form factors and the nucleon axial form factor have been calculated in the Goldstone-boson exchange constituent-quark model within the point-form approach to...
Elastic Form Factors in Point-form Approach (2000)
Using the point-form approach to relativistic quantum mechanics, a covariant framework is presented for the calculation of proton and neutron electromagnetic form factors. Results for charge radii,...
Covariant nucleon electromagnetic form factors from the Goldstone-boson-exchange quark model (2000)
Wagenbrunn, R. F., Boffi, S., Klink, W., Plessas, W., Radici, M.
We present a study of proton and neutron electromagnetic form factors for the recently proposed Goldstone-boson-exchange constituent quark model. Results for charge radii, magnetic moments, and...
Calculation of fragmentation functions in two-hadron semi-inclusive processes (2000)
Bianconi, A., Boffi, S., Boer, D., Jakob, R., Radici, M.
We investigate the properties of interference fragmentation functions arising from the emission of two leading hadrons inside the same jet for inclusive lepton-nucleon deep-inelastic scattering....
Nucleon magnetic moments in an extended chiral constituent quark model (2000)
Wagenbrunn, R. F., Radici, M., Boffi, S., Demetriou, P.
We present results for the nucleon magnetic moments in the context of an extended chiral constituent quark model based on the mechanism of the Goldstone boson exchange, as suggested by the...
Nucleon Electromagnetic Form Factors in a chiral constituent-quark model (1999)
Demetriou, P., Boffi, S., Radici, M., Wagenbrunn, R. F.
The electromagnetic form factors of the nucleon are calculated in an extended chiral constituent-quark model where the effective interaction is described by the exchange of pseudoscalar, vector, and...
Two-hadron interference fragmentation functions. Part II: a model calculation (1999)
Bianconi, A., Boffi, S., Jakob, R., Radici, M.
We present a model calculation of leading order interference fragmentation functions arising from the distribution of two hadrons produced in the same jet of a fragmenting quark in a hard process....
Two-hadron interference fragmentation functions. Part I: general framework (1999)
Bianconi, A., Boffi, S., Jakob, R., Radici, M.
We investigate the properties of interference fragmentation functions measurable from the distribution of two hadrons produced in the same jet in the current fragmentation region of a hard process....
Interference Fragmentation Functions in Deep Inelastic Scattering (1999)
Bianconi, A., Boffi, S., Jakob, R., Radici, M.
We give a general overview of the role and interpretation of fragmentation functions in hard processes. Transverse momentum dependence gives rise to time-reversal odd fragmentation functions...
Two-hadron Inclusive DIS and Interference Fragmentation Functions (1999)
We investigate the properties of interference fragmentation functions arising from the emission of two leading hadrons inside the same jet for semi-inclusive lepton-nucleon deep-inelastic scattering....
Nucleon form factors in a chiral constituent-quark model (1998)
Boffi, S., Demetriou, P., Radici, M., Wagenbrunn, R. F.
The electromagnetic form factors of the nucleon have been calculated in a chiral constituent-quark model. The nucleon wave functions are obtained by solving a Schr\"odinger-type equation for a...
Semi-relativistic charge-current density operator (1998)
Boffi, S., Capuzzi, F., Demetriou, P., Radici, M.
The charge-current density and two-photon operators consistent with a single-particle semi-relativistic Hamiltonian are derived within a suitable functional derivative formalism which preserves gauge...
Golubeva, Ye. S., Kondratyuk, L. A., Bianconi, A., Boffi, S., Radici, M.
The problem of nuclear propagation through the nuclear medium in quasielastic A(e,e'p) reactions is discussed in the kinematic range 1
Helicity Asymmetry for Proton Emission from Polarized Electrons in the Eikonal Regime (1997)
The nuclear response to longitudinally polarized electrons, detected in coincidence with out-of-plane high-energy protons, is discussed in a simple model where the ejectile wave function is...
Photocouplings of nucleon resonances with gluon and pion exchange currents (1996)
Perazzi, E., Radici, M., Boffi, S.
Photocouplings for the nucleon resonances most relevant to total photoabsorption are calculated in a constituent quark model including gluon and pion exchange. The sensitivity of the results to the...
High-momentum proton removal from 16O and the (e,e'p) cross section (1996)
Polls, A., Radici, M., Boffi, S., Dickhoff, W. H., Muether, H.
The cross section for the removal of high-momentum protons from 16O is calculated for high missing energies. The admixture of high-momentum nucleons in the 16O ground state is obtained by calculating...
Angular Distributions for Knockout and Scattering of Protons in the Eikonal Approximation (1996)
The advent of new electron accelerators with few-GeV beam energies makes the (e,e'p) reaction a promising tool for investigating new aspects of the electromagnetic interaction. To this purpose it is...
The (e,e'p) Reaction and the Transition to the Eikonal Regime (1995)
The reliability of the models describing the Final-State Interactions (FSI) in (e,e$'$p) scattering at high proton energies is an important issue in view of the experiments planned at CEBAF. One of...
A Test of the Eikonal Approximation in High-Energy (e,e'p) Scattering (1995)
The Glauber method is extensively used to describe the motion of a hadronic projectile in interaction with the surrounding nuclear medium. One of the main approximations consists in the linearization...
Many-body effects in 16O(e,e'p) (1994)
Radici, M., Boffi, S., Pieper, Steven C., Pandharipande, V. R.
Effects of nucleon-nucleon correlations on exclusive $(e,e'p)$ reactions on closed-shell nuclei leading to single-hole states are studied using $^{16}O(e,e'p)^{15}N$ ($6.32$ MeV, $3/2^-$) as an...