Publications (60)
Non-perturbative momentum dependence of the coupling constant and hadronic models
A. Courtoy, S. Scopetta, V. Vento
Models of hadron structure are associated with a hadronic scale which allows by perturbative evolution to calculate observables in the deep inelastic region. The resolution of Dyso…
Evidence for the flavor singlet axial anomaly related effects in meson electromagnetic production at large momentum transfers
N. I. Kochelev, V. Vento
The gluonic contributions to the conventional PCAC formulas due to flavor singlet axial anomaly have been instrumental in explaining the mass of the and providing a p…
Single Spin Asymmetry Parameter from Deeply Virtual Compton Scattering of Hadrons up to Twist-3 accuracy: I. Pion case
I. V. Anikin, D. Binosi, R. Medrano +2
The study of deeply virtual Compton scattering has shown that electromagnetic gauge invariance requires, to leading order, not only twist two but additional twist three contributio…
Triquark correlations and pentaquarks in a QCD sum rule approach
Hee-Jung Lee, N. I. Kochelev, V. Vento
The role of quark correlations in the description of hadron dynamics in many domains of physics, from low energy dynamics to very hot(dense) systems, is being appreciated. Strong c…
Model calculations of the Sivers function satisfying the Burkardt Sum Rule
A. Courtoy, S. Scopetta, V. Vento
It is shown that, at variance with previous analyses, the MIT bag model can explain the available data of the Sivers function and satisfies the Burkardt Sum Rule to a few percent a…
Instanton induced quark dynamics and the pentaquark
N. I. Kochelev, H. -J. Lee, V. Vento
We analyze the existence of the exotic from the perspective of instanton induced quark dynamics. The 't Hooft interaction gives strong attraction in specific channels of the…
Sivers Asymmetry for the proton and the neutron
S. Scopetta, A. Courtoy, F. Fratini +1
A formalism is presented to evaluate the Sivers function in constituent quark models. A non-relativistic reduction of the scheme is performed and applied to the Isgur-Karl model. T…
Medium Effects in DIS from Polarized Nuclear Targets
H. Fanchiotti, C. A. GarcÃa-Canal, T. Tarutina +1
The behavior of the nucleon structure functions in lepton nuclei deep inelastic scattering, both polarized and unpolarized, due to nuclear structure effects is reanalyzed. The stud…
Generalized parton distributions and constituent quarks
S. Scopetta, V. Vento
An approach is described to calculate Generalized Parton Distributions (GPDs) in Constituent Quark Models (CQM). The GPDs are obtained from wave functions to be evaluated in a give…
The Physics Programme Of The MoEDAL Experiment At The LHC
B. Acharya, J. Alexandre, J. Bernabéu +59
The MoEDAL experiment at Point 8 of the LHC ring is the seventh and newest LHC experiment. It is dedicated to the search for highly ionizing particle avatars of physics beyond the…
Double parton correlations in constituent quark models
M. Rinaldi, S. Scopetta, V. Vento
Double parton correlations, having effects on the double parton scattering processes occurring in high-energy hadron-hadron collisions, for example at the LHC, are studied in the v…
Dynamical confinement in bosonized QCD2
A. Ferrando, V. Vento
In the bosonized version of two dimensional theories non trivial boundary conditions (topology) play a crucial role. They are inevitable if one wants to describe non singlet states…
Gluonic components of the pion and the transition form factor $γ^*γ^*\toÏ^0 $
N. I. Kochelev, V. Vento
We propose an effective lagrangian for the coupling of the neutral pion with gluons whose strength is determined by a low energy theorem. We calculate the contribution of the gluon…
Polarized Parton Distributiions and Light-Front Dynamics
P. Faccioli, M. Traini, V. Vento
We present a consistent calculation of the structure functions within a light-front constituent quark model of the nucleon. Relativistic effects and the relevance of the covariance…
About the realization of chiral symmetry in QCD2
A. Ferrando, V. Vento
Two dimensional massless Quantum Chromodynamics presents many features which resemble those of the true theory. In particular the spectrum consists of mesons and baryons arranged i…
DIS structure functions and the double-spin asymmetry in electroproduction within a Regge approach
N. I. Kochelev, K. Lipka, W. -D. Nowak +2
The proton, neutron and deuteron structure functions and , measured at intermediate , are analyzed within a Regge approach. This analysis serves to fi…
Pseudoscalar glueball and mixing
V. Mathieu, V. Vento
We have performed a dynamical analysis of the mixing in the pseudoscalar channel with the goal of understanding the existence and behavior of the pseudoscalar glueball. Our philoso…
A QCD sum rule analysis of the pentaquark
Hee-Jung Lee, N. I. Kochelev, V. Vento
We perform a QCD sum rule calculation to determine the mass and the parity of the lowest lying pentaquark state. We include operators up to dimension in the OPE and the dire…
Instantons and Meson Production near threshold in NN collisions
N. I. Kochelev, V. Vento, A. V. Vinnikov
An enhancement for the production in proton-neutron collisions as compared with that in proton-proton scattering has been recently observed. We present a calculation for the p…
Generalized parton distributions of the pion in a Bethe-Salpeter approach
S. Noguera, L. Theussl, V. Vento
We calculate generalized parton distribution functions in a field theoretic formalism using a covariant Bethe-Salpeter approach for the determination of the bound-state wave functi…
Can the enhancement be a signal of light magnetic monopoles?
L. N. Epele, H. Fanchiotti, C. A +3
The announced ~ 3 Ï enhancement in the inclusive γ γ -spectrum at ~ 750 GeV made by the ATLAS and CMS collaborations at LHC might indicate the existence of a monopole-antimonopo…
Polarized Parton Distributions in Light-Front Dynamics
P. Faccioli, F. Cano, M. Traini +1
We present a consistent calculation of the structure functions within a light-front constituent quark model of the nucleon. Relativistic effects and the relevance of the covariance…
First search for dyons with the full MoEDAL trapping detector in 13 TeV pp collisions
B. Acharya, J. Alexandre, P. Benes +66
The MoEDAL trapping detector, consists of approximately 800 kg of aluminium volumes. It was exposed during Run-2 of the LHC program to 6.46 fb^-1 of 13 TeV proton-proton collisions…
Sivers function in constituent quark models
S. Scopetta, A. Courtoy, F. Fratini +1
A formalism to evaluate the Sivers function, developed for calculations in constituent quark models, is applied to the Isgur-Karl model. A non-vanishing Sivers asymmetry, with oppo…
Search for magnetic monopoles with the MoEDAL forward trapping detector in 13 TeV proton-proton collisions at the LHC
MoEDAL Collaboration, B. Acharya, J. Alexandre +68
MoEDAL is designed to identify new physics in the form of long-lived highly-ionising particles produced in high-energy LHC collisions. Its arrays of plastic nuclear-track detectors…
A quark model analysis of the Sivers function
A. Courtoy, F. Fratini, S. Scopetta +1
We develop a formalism to evaluate the Sivers function. The approach is well suited for calculations which use constituent quark models to describe the structure of the nucleon. A…
MoEDAL search in the CMS beam pipe for magnetic monopoles produced via the Schwinger effect
B. Acharya, J. Alexandre, S. C. Behera +64
We report on a search for magnetic monopoles (MMs) produced in ultraperipheral Pb--Pb collisions during Run-1 of the LHC. The beam pipe surrounding the interaction region of the CM…
Search for Highly-Ionizing Particles in pp Collisions at the LHC's Run-1 Using the Prototype MoEDAL Detector
B. Acharya, J. Alexandre, P. Benes +68
A search for highly electrically charged objects (HECOs) and magnetic monopoles is presented using 2.2 fb-1 of p - p collision data taken at a centre of mass energy (ECM) of 8 TeV…
Search for magnetic monopoles with the MoEDAL forward trapping detector in 2.11 fb of 13 TeV proton-proton collisions at the LHC
MoEDAL Collaboration, B. Acharya, J. Alexandre +68
We update our previous search for trapped magnetic monopoles in LHC Run 2 using nearly six times more integrated luminosity and including additional models for the interpretation o…
Studying the Sivers function by model calculations
A. Courtoy, S. Scopetta, V. Vento
A formalism is presented to evaluate the Sivers function in constituent quark models. A non-relativistic reduction of the scheme is performed and applied to the Isgur-Karl model. T…
Nucleon and delta masses in QCD
M. Rafecas, V. Vento
Using the positivity of the path integral measure of and defining a structure for the quark propagator in a background field according to the fluxon scenario for confinement,…
Relation between the Berry phase in quantum hermitian and non-hermitian systems and the Hannay phase in the equivalent classical systems
H. Fanchiotti, C. A. Garcia Canal, M. Mayosky +2
The well-known geometric phase present in the quantum adiabatic evolution discovered by Berry many years ago has its analogue, the Hannay phase, in the classical domain.We calculat…
Instantons and the Rule
N. I. Kochelev, V. Vento
The instanton induced interaction leads to a significant enhancement of the weak amplitude determining the rule, through the contribution of operators with dimensio…
The Cheshire Cat revisited
V. Vento
The concept of effective field theory leads in a natural way to a construction principle for phenomenological sensible models known under the name of the Cheshire Cat Principle. We…
New Anomalous Exchange in Regge Phenomenology and Hard Diffraction
N. I. Kochelev, D. -P. Min, Y. Oh +2
A new mechanism for hard diffraction based on the anomalous trajectory exchange, which we identify as the odd signature partner of the Pomeron, is suggested. We calculate the…
Double parton scattering: a study of the effective cross section within a Light-Front quark model
M. Rinaldi, S. Scopetta, M. Traini +1
We present a calculation of the effective cross section , an important ingredient in the description of double parton scattering in proton-proton collisions. Our theoreti…
Gluonic effects in vector meson photoproduction at large momentum transfers
N. I. Kochelev, V. Vento
Non-perturbative QCD mechanisms are of fundamental importance in strong interaction physics. In particular, the flavor singlet axial anomaly leads to a gluonic pole mechanism which…
The Geometric Origin of the CP Phase
H. Fanchiotti, C. A. GarcÃa Canal, V. Vento
The complex phase present in CP-violating systems such as neutral kaons is shown to be of geometrical origin. It is also concluded that the complex phase of the Cabibbo--Kobayashi-…
The pion in the graviton soft-wall model: phenomenological applications
M. Rinaldi, F. A. Ceccopieri, V. Vento
The holographic graviton soft-wall model, introduced to describe the spectrum of scalar and tensor glueballs, is improved to incorporate the realization of chiral-symmetry as in QC…
Atiyah-Manton Approach to Skyrmion Matter
B. -Y. Park, D. -P. Min, M. Rho +1
We propose how to approach, and report on the first results in our effort for, describing nuclear matter starting from the solitonic picture of baryons which is supposed to represe…
Heavy meson interquark potential
P. Gonzalez, V. Mathieu, V. Vento
The resolution of Dyson-Schwinger equations leads to the freezing of the QCD running coupling (effective charge) in the infrared, which is best understood as a dynamical generation…
Parton distributions in a constituent quark scenario
S. Scopetta, V. Vento, M. Traini
A simple picture of the constituent quark as a composite system of point-like partons is used to construct the unpolarized and polarized parton distributions by a convolution betwe…
Further Comments on a Vanishing Singlet Axial Vector Charge
T. P. Cheng, N. I. Kochelev, V. Vento
The recent suggestion of a vanishing flavor-singlet axial charge of nucleon due to a nontrivial vacuum structure is further amplified. A perturbative QCD discussion, applicable for…
Off-diagonal quark distribution functions of the pion within an effective single instanton approximation
I. V. Anikin, A. E. Dorokhov, A. E. Maximov +2
We develop a relativistic quark model for pion structure, which incorporates the non-trivial structure of the vacuum of Quantum Chromodynamics as modelled by instantons. Pions are…
Towards a Unified Description of the Baryon Spectrum and the Baryon-Baryon Interaction within a Potential Model Scheme
A. Valcarce, F. Fernandez, P. Gonzalez +1
We study the low energy part of the nucleon and spectra by solving the Schrödinger equation for the three-quark system in the hyperspherical harmonic approach. The quark-quar…
Pion Parton Distributions in a non local Lagrangian
S. Noguera, V. Vento
We use phenomenological nonlocal Lagrangians, which lead to non trivial forms for the quark propagator, to describe the pion. We define a procedure, based on the Dyson-Schwinger eq…
Orbital Angular Momentum Parton Distributions in Quark Models
S. Scopetta, V. Vento
At the low energy, {\sl hadronic}, scale we calculate Orbital Angular Momentum (OAM) twist-two parton distributions for the relativistic MIT bag model and for non-relativistic quar…
Measuring the Hannay geomatric phase
H. Fanchiotti, C. A. Garcia Canal, M. Mayosky +2
An electric network whose dynamics is entirely equivalent to the Foucault pendulum is presented. This circuit allows one to measure in a simulation of the circuit, and eventually i…
The last bursts of Quark Gluon Plasma
V. Vento, Departamento de Fisica Teorica, IFIC +2
We study the behavior of the scalar glueball inside a Quark Gluon Plasma. We follow the fireball from the plasma phase to the hadronic phase and observe that an interesting phenome…
Pionic effects in deep inelastic scattering off nuclei
P. Gonzalez, V. Vento
The structure functions calculated in the Chiral bag model reproduce quite well, after appropriate perturbative evolution to large energy scales, the experimental data. We use thes…
Analyzing the Boer-Mulders function within different quark models
A. Courtoy, S. Scopetta, V. Vento
A general formalism for the evaluation of time reversal odd parton distributions is applied here to calculate the Boer-Mulders function. The same formalism when applied to evaluate…
A mechanism for the Double-Spin Asymmetry in Electromagnetic Production at HERMES
N. I. Kochelev, D. -P. Min, V. Vento +1
We calculate the contribution of meson and pomeron exchanges to the double-spin asymmetry in -meson electromagnetic production at HERMES energies. We show that the observed dou…
Non Perturbative One Gluon Exchange Potential from Dyson-Schwinger Equations
P. Gonzalez, V. Vento, V. Mathieu
Recent progress in the solution of Dyson-Schwinger equations of QCD allows for a non perturbative evaluation of the One Gluon Exchange (OGE) interaction. We calculate the interquar…
Hadron Correlators and the Structure of the Quark Propagator
A. Ferrando, V. Vento
The structure of the quark propagator of in a confining background is not known. We make an Ansatz for it, as hinted by a particular mechanism for confinement, and analyze it…
First experimental search for production of magnetic monopoles via the Schwinger mechanism
B. Acharya, J. Alexandre, P. Benes +64
Schwinger showed that electrically-charged particles can be produced in a strong electric field by quantum tunnelling through the Coulomb barrier. By electromagnetic duality, if ma…
Deuteron structure in the deep inelastic regime
C. A. Garcìa Canal, T. Tarutina, V. Vento
We study nuclear effects on the deuteron in the deep inelastic regime using the newest available data analyzing their dependence. We conclude that precise EMC ratios for larg…
Magnetic monopole search with the full MoEDAL trapping detector in 13 TeV collisions interpreted in photon-fusion and Drell-Yan production
MoEDAL Collaboration, B. Acharya, J. Alexandre +66
MoEDAL is designed to identify new physics in the form of stable or pseudostable highly ionizing particles produced in high-energy Large Hadron Collider (LHC) collisions. Here we u…
The Gluon Spin in the Chiral Bag Model
H. -J. Lee, D. -P. Min, B. -Y. Park +2
We study the gluon polarization contribution at the quark model renormalization scale to the proton spin, , in the chiral bag model. It is evaluated by taking the expectation v…
Search for magnetic monopoles with the MoEDAL prototype trapping detector in 8 TeV proton-proton collisions at the LHC
MoEDAL Collaboration, B. Acharya, J. Alexandre +66
The MoEDAL experiment is designed to search for magnetic monopoles and other highly-ionising particles produced in high-energy collisions at the LHC. The largely passive MoEDAL det…
The pion transition form factor and the pion distribution amplitude
S. Noguera, V. Vento
Recent BaBaR data on the pion transition form factor, whose Q^2 dependence is much steeper then predicted by asymptotic Quantum Chromodynamics (QCD), have caused a renewed interest…