New approach to the Parton Distribution Functions: Self-Organizing Maps (2008)
We propose a Parton Distribution Function (PDF) fitting technique which is based on an interactive neural network algorithm using Self-Organizing Maps (SOMs). SOMs are visualization algorithms based...
New avenue to the Parton Distribution Functions: Self-Organizing Maps (2008)
Carnahan, J., Honkanen, H., Liuti, S., Loitiere, Y., Reynolds, P. R.
Neural network algorithms have been recently applied to construct Parton Distribution Function (PDF) parametrizations which provide an alternative to standard global fitting procedures. We propose a...
Generalized Parton Distributions and Hadronic Observables (2007)
Ahmad, S., Honkanen, H., Liuti, S., Taneja, S. K.
Following a previous detailed study of unpolarized generalized parton distribution functions in the non-singlet sector, and at zero values of the skewness variable, $\zeta$, we propose a physically...
Obtaining Parton Distribution Functions from Self-Organizing Maps (2006)
Honkanen, H., Liuti, S., Loitiere, Y. C., Brogan, D., Reynolds, P.
We present an alternative algorithm to global fitting procedures to construct Parton Distribution Functions (PDFs) parametrizations. The proposed algorithm uses Self-Organizing Maps (SOMs) which at...
The Transition between Perturbative and Non-perturbative QCD 2005-06-06 - 2005-06-08 (2006)
A. Fantoni, DESY Forschung Hochenergiephysik, S. Liuti
Contribution to a conf. proceeding (book/online)
The Transition between Perturbative and Non-Perturbative QCD (2005)
We study both polarized and unpolarized proton structure functions in the kinematical region of large Bjorken x and four-momentum transfer of few GeV^2. In this region the phenomenon of parton-hadron...
Microscopic Description of Deeply Virtual Compton Scattering off Spin-0 Nuclei (2005)
We evaluate within a microscopic calculation the contributions of both coherent and incoherent deeply virtual Compton scattering from a spin-0 nucleus. The coherent contribution is obtained when the...
Nuclear Medium Modifications of Hadrons from Generalized Parton Distributions (2005)
We study the structure of generalized parton distributions in spin 0 nuclei within a microscopic approach for nuclear dynamics. GPDs can be used on one side as tools to unravel the deep inelastic...
Generalized Parton Distributions and Transversity in Nucleons and Nuclei (2005)
We present an exploratory study using generalized parton distributions of several observables related to transverse degrees of freedom in hadronic structure -- the nucleon transverse momentum, the...
Quark-hadron duality and higher twist contributions in structure functions (2005)
Fantoni, A., Bianchi, N., Liuti, S.
Quark-hadron duality is studied in a systematic way for polarized and unpolarized structure functions, by taking into account all the available data in the resonance region. In both cases, a precise...
Quark-Hadron Duality in Structure Functions (2005)
Fantoni, A., Bianchi, N., Liuti, S.
Quark-hadron duality is studied in a systematic way for both the unpolarized and polarized structure functions, by taking into account all the available data in the resonance region.In both cases, a...
Generalized Parton Distributions: A New Avenue to Color Transparency Phenomena (2004)
Color Transparency studies have been since long suggested as a means to study the occurrence and relevance of small size hadronic configurations, predicted within QCD to dominate exclusive scattering...
Liuti, S., Bianchi, N., Fantoni, A.
A large fraction of the world data on both polarized and unpolarized inclusive $ep$ scattering at large Bjorken $x$ lies in the resonance region where a correspondence with the deep inelastic regime,...
Generalized Parton Distributions and Color Transparency (2004)
We study the structure of generalized parton distributions in impact parameter space with the aim of determining the size and role of small transverse separations components in the quarks wave...
Parton-Hadron Duality in Unpolarised and Polarised Structure Functions (2003)
Bianchi, N., Fantoni, A., Liuti, S.
We study the phenomenon of parton-hadron duality in both polarised and unpolarised electron proton scattering using the HERMES and the Jefferson Lab data, respectively. In both cases we extend a...
Deep inelastic scattering from A=3 nuclei and the neutron structure function (2003)
Afnan, I. R., Bissey, F., Gomez, J., Katramatou, A. T., Liuti, S., Melnitchouk, W., ...
We present a comprehensive analysis of deep inelastic scattering from He-3 and H-3, focusing in particular on the extraction of the free neutron structure function, F_2^n. Nuclear corrections are...
Isospin Dependence of Power Corrections in Deep Inelastic Scattering (2003)
Alekhin, S. I., Kulagin, S. A., Liuti, S.
We present results of a perturbative QCD analysis of deep inelastic measurements of both the deuteron and proton structure functions. We evaluate the theoretical uncertainty associated to nuclear...
Deep inelastic scattering from A =3 nuclei and the neutron structure function (2003)
Afnan, I. R., Bissey, Francois, Gomez, J., Katramatou, A. T., Liuti, S., Melnitchouk, W., ...
Deep inelastic scattering from A =3 nuclei and the neutron structure function (2003)
Afnan, I. R., Bissey, Francois, Gomez, J., Katramatou, A. T., Liuti, S., Melnitchouk, W., ...
Unraveling Violations of Parton-Hadron Duality in ep Scattering (2002)
Recent studies of the Q^2 dependence of ep scattering in the large x region and in the Q^2 range: 1 < Q^2 2.4 GeV^2 At lower values of W^2, duality is found to be significantly violated by an amount...
Perturbative QCD Analysis of Local Duality in a fixed W^2 Framework (2001)
Liuti, S., Ent, R., Keppel, C. E., Niculescu, I.
We study the global Q^2 dependence of large x, F_2 nucleon structure function data, with the aim of providing a perturbative-QCD based, quantitative analysis of parton-hadron duality. As opposed to...
Moments of the Proton F2 Structure Function at Low Q2 (2001)
Armstrong, C. S., Ent, R., Keppel, C. E., Liuti, S., Niculescu, G., Niculescu, I.
The Q^2 dependence of inclusive electron-proton scattering F_2 structure function data in both the nucleon resonance region and the deep inelastic region, at momentum transfers below 5 (GeV/c)^2, is...
An Analysis of the Asymptotic Limit of Gluon Shadowing (2000)
We examine the gluon distributions in nuclei in the asymptotic region defined by $Q^2 \to \infty$, $x \to 0$. An analysis using the Double Asymptotic Scaling variables of Ball and Forte is proposed....
Asymptotic Gluon Shadowing (2000)
We examine the low Bjorken $x$ gluon distribution in nuclei in the asymptotic region.
A Systematic Study of Power Corrections from World Deep Inelastic Scattering Measurements (1998)
By performing an analysis in moment space using high statistics DIS world data, we extract the values of both the QCD parameter $\Lambda^{(4)}_{\bar{MS}}$ up to NLO and of the power corrections to...
We study nuclear shadowing in J=/ and Upsilon production in hadron-nucleus interactions and in nucleus-nucleus collisions at the Relativistic Heavy Ion Collider and the Large Hadron Collider. As a...
Off-shell Corrections and Moments of the Deep Inelastic Nuclear Structure Functions (1997)
Cothran, C. D., Day, D. B., Liuti, S.
We present an improved method for handling off-shell effects in deep inelastic nuclear scattering. With a firm understanding of the effects of the nuclear wave function, including these off-shell...
Accidental $\xi$-scaling as a Signature of Nuclear Effects at $x>1$ (1995)
We propose an interpretation of the $\xi$-scaling behavior of nuclear structure functions observed at Bjorken $x>1$ and $Q^2 \lesssim 4 \, {\rm (GeV/c)^2}$. We show that at $\xi \gtrsim 1$,...
We discuss how the virtuality of the struck particle may affect the final state interactions in electron-nucleus scattering. The extent to which short range correlations inhibit rescattering taking...
We study nuclear shadowing in $J/\psi$ and $\Upsilon$ production in hadron-nucleus interactions and in nucleus-nucleus collisions at the Relativistic Heavy Ion Collider and the Large Hadron Collider....