V. Mathieu

Interpretation of the LHCb Pc(4312) Signal

JPAC Collaboration, C. Fernandez-Ramirez, A. Pilloni +6

We study the nature of the new signal reported by LHCb in the J/psi p spectrum. Based on the S-matrix principles, we perform a minimum-bias analysis of the underlying reaction ampl…

Toward Complete Pion Nucleon Amplitudes

V. Mathieu, I. V. Danilkin, C. FernÃ¡ndez-RamÃrez +4

We compare the low-energy partial wave analyses $I ¨ N$ scattering with a high-energy data via finite energy sum rules. We construct a new set of amplitudes by matching the imaginary…

hep-ph2025

Casimir scaling in glueballs in SU( $N$ ) and Sp( $2 N$ ) gauge theories: hints from constituent approaches

F. Buisseret, C. Chevalier, V. Mathieu +1

We show that the lattice glueball masses $M_{G}$ versus $N$ in SU( $N$ ) and Sp( $2 N$ ) Yang-Mills theories scale as $\frac{M _{G}}{I ¨ } \sim \frac{C _{2} ( a d j )}{C _{2} ( f )}$ , with $I ¨ $ t…

Semirelativistic potential model for three-gluon glueballs

V. Mathieu, C. Semay, B. Silvestre-Brac

The three-gluon glueball states are studied with the generalization of a semirelativistic potential model giving good results for two-gluon glueballs. The Hamiltonian depends only…

hep-ex2026

First Observation of an Exotic Reggeon

G. D. Alexeev, M. G. Alexeev, C. Alice +180

We present new \compass high-statistics measurements of the peripheral production of $I^\cdot I ¨ ^{-}$ and $I^\cdot^{'} I ¨ ^{-}$ pairs in the reactions $I ¨ ^{-} p \to I^\cdot^{(')} I ¨ ^{-} p$ . For the…

On the Equivalence of Three-Particle Scattering Formalisms

A. W. Jackura, S. M. Dawid, C. FernÃ¡ndez-RamÃrez +5

In recent years, different on-shell $3 \to 3$ scattering formalisms have been proposed to be applied to both lattice QCD and infinite volume scattering processes. W…

nucl-ex2020

First measurement of direct photoproduction of the $a_{2} (1320)^{0}$ meson on the proton

A. Celentano, M. Battaglieri, R. De Vita +4

We present the first measurement of the exclusive reaction $I^^{3} p \to a_{2} (1320)^{0} p$ in the photon energy range $3.5$ - $5.5$ GeV and four-momentum transfer squared $0.2<-t<…

hep-ph2016

Coupled-Channel Model for $K ˉ N$ Scattering in the Resonant Region

C. Fernandez-Ramirez, I. V. Danilkin, D. M. Manley +2

We present a unitary multichannel model for $K ˉ N$ scattering in the resonance region that fulfills unitarity. It has the correct analytical properties for the amplitudes once…

Pole position of the $a_{1} (1260)$ from $I ¨ $ -decay

JPAC Collaboration, M. Mikhasenko, A. Pilloni +8

We perform an analysis of the three-pion system with quantum numbers $J^{P C} = 1^{++}$ produced in the weak decay of $I ¨ $ leptons. The interaction is known to be dominated by the axi…

Phenomenology of Relativistic $3 \to 3$ Reaction Amplitudes within the Isobar Approximation

JPAC Collaboration, A. Jackura, C. FernÃ¡ndez-RamÃrez +7

Further progress in hadron spectroscopy necessitates the phenomenological description of three particle reactions. We consider the isobar approximation, where the connected part of…

Exclusive tensor meson photoproduction

JPAC Collaboration, V. Mathieu, A. Pilloni +5

We study tensor meson photoproduction outside of the resonance region, at beam energies of few GeVs. We build a model based on Regge theory that includes the leading vector and axi…

nucl-ex2022

Measurement of Spin Density Matrix Elements in $I^ (1520)$ Photoproduction at 8.2-8.8 GeV

GlueX Collaboration, S. Adhikari, C. S. Akondi +143

We report on the measurement of spin density matrix elements of the $I^ (1520)$ in the photoproduction reaction $I^^{3} p \to I^ (1520) K^{+}$ , via its subsequent decay to $K^{-} p$ . T…

Three-body scattering: Ladders and Resonances

M. Mikhasenko, Y. Wunderlich, A. Jackura +4

We discuss unitarity constraints on the dynamics of a system of three interacting particles. We show how the short-range interaction that describes three-body resonances can be sep…

The Glueball Spectrum from Constituent Models

V. Mathieu, F. Buisseret, C. Semay +1

We present a model for odd- $C$ (negative charge parity) glueballs with three constituent gluons. The model is an extension of a previous study of two-gluon glueballs. We show that,…

hep-ph2024

XYZ spectroscopy at electron-hadron facilities III: Semi-inclusive processes with vector exchanges

Joint Physics Analysis Center Collaboration, D. Winney, A. Pilloni +10

Inclusive production processes will be important for the first observations of $X Y Z$ states at new generation electron-hadron colliders, as they generally benefit from larger cross…

hep-ph2023

Dynamics in near-threshold $J / I ¨ $ photoproduction

JPAC Collaboration, D. Winney, C. Fernandez-Ramirez +12

The study of $J / I ¨ $ photoproduction at low energies has consequences for the understanding of multiple aspects of nonperturbative QCD, ranging from mechanical properties of the pro…

hep-ph2016

Workshop on Physics with Neutral Kaon Beam at JLab (KL2016) Mini-Proceedings

M. Albrow, M. Amaryan, E. Chudakov +34

The KL2016 Workshop is following the Letter of Intent LoI12-15-001 "Physics Opportunities with Secondary KL beam at JLab" submitted to PAC43 with the main focus on the physics of e…

Moments of angular distribution and beam asymmetries in $I^\cdot I ¨ ^{0}$ photoproduction at GlueX

V. Mathieu, M. Albaladejo, C. FernÃ¡ndez-RamÃrez +4

In the search for exotic mesons, the GlueX collaboration will soon extract moments of the $I^\cdot I ¨ ^{0}$ angular distribution. In the perspective of these results, we generalize the form…

Dalitz-plot decomposition for three-body decays

JPAC Collaboration, M. Mikhasenko, M. Albaladejo +9

We present a general formalism to write the decay amplitude for multibody reactions with explicit separation of the rotational degrees of freedom, which are well controlled by the…

New analysis of $I^\cdot I ¨ $ tensor resonances measured at the COMPASS experiment

A. Jackura, C. Fernandez-Ramirez, M. Mikhasenko +232

We present a new amplitude analysis of the $I^\cdot I ¨ $ $D$ -wave in $I ¨ ^{-} p \to I^\cdot I ¨ ^{-} p$ measured by COMPASS. Employing an analytical model based on the principles of the relativistic $S…

Features of $I ¨ I^$ Photoproduction at High Energies

J. Nys, V. Mathieu, C. FernÃ¡ndez-RamÃrez +7

Hybrid/exotic meson spectroscopy searches at Jefferson Lab require the accurate theoretical description of the production mechanism in peripheral photoproduction. We develop a mode…

hep-ph2010

Pseudoscalar glueball and $I^\cdot - I^\cdot^{'}$ 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…

#pi1(1600) resonance#three-pion decays#final-state interactions#deck mechanism

On the $I^\cdot$ and $I^\cdot^{'}$ Photoproduction Beam Asymmetry at High Energies

V. Mathieu, J. Nys, C. FernÃ¡ndez-RamÃrez +5

We show that, in the Regge limit, beam asymmetries in $I^\cdot$ and $I^\cdot^{'}$ photoproduction are sensitive to hidden strangeness components. Under reasonable assumptions about the coupling…

hep-ph2026

Production Effects and Final-state Interactions in $I ¨ _{1} \to 3 I ¨ $

D. Winney, S. GonzÃ lez-SolÃs, M. Mikhasenko +8

The paper presents a unified formalism that combines production mechanisms (including the Deck effect) and final‑state interactions to model the π₁(1600) → 3π decay, and fits the C…

hep-ph2015

Three-body Final State Interaction in $I^\cdot \to 3 I ¨ $

Peng Guo, Igor V. Danilkin, Diane Schott +3

We present an unitary dispersive model for the $I^\cdot \to 3 I ¨ $ decay process based upon the Khuri-Treiman equations which are solved by means of the Pasquier inversion method. The des…

Regge phenomenology of the $N^{}$ and $I^^{}$ poles

JPAC collaboration, J. A. Silva-Castro, C. Fernandez-Ramirez +8

We use Regge phenomenology to study the structure of the poles of the $N^{*}$ and $I^^{*}$ spectrum. We employ the available pole extractions from partial wave analysis of meson scatte…

hep-ph2025

$I ¨ \to 3 I ¨ $ and $I ¨ I ¨ ^{0}$ transition form factor from Khuri-Treiman equations

A. Garcia-Lorenzo, M. Albaladejo, S. Gonzlez-Solis +6

This work studies the $I ¨ \to 3 I ¨ $ decay and the $Ï\to Ï^0 Î³^\ast$ transition form factor, utilizing the Khuri-Treiman formalism to account for analyticity, crossing, and unitari…

XYZ spectroscopy at electron-hadron facilities: Exclusive processes

JPAC Collaboration, M. Albaladejo, A. N. Hiller Blin +5

The next generation of electron-hadron facilities has the potential for significantly improving our understanding of exotic hadrons. The XYZ states have not been seen in photon-ind…

nucl-ex2024

White Paper on Polarized Target Studies with Real Photons in Hall D

F. Afzal, M. M. Dalton, A. Deur +5

This white paper summarizes the Workshop on Polarized Target Studies with Real Photons in Hall D at Jefferson Lab, that took place on 21 February 2024. The Workshop included about…

hep-ph2014

Double-Regge Exchange Limit for the $I^^{3} p \to K^{+} K^{-} p$ Reaction

M. Shi, I. V. Danilkin, C. FernÃ¡ndez-RamÃrez +4

We apply the generalized Veneziano model ( $B_{5}$ model) in the double-Regge exchange limit to the $I^^{3} p \to K^{+} K^{-} p$ reaction. Four different cases defined by the possible combinat…

hep-ph2013

$(2 + 1)$ - $d$ Glueball Spectrum within a Constituent Picture

F. Buisseret, V. Mathieu, C. Semay

The quantum numbers and mass hierarchy of the glueballs observed in $(2 + 1)$ -dimensional lattice QCD with gauge group SU( $N_{c}$ ) are shown to be in agreement with a constituent pictu…

hep-ph2022

Progress and Opportunities in Backward angle (u-channel) Physics

C. Ayerbe Gayoso, Å. Bibrzycki, S. Diehl +17

Backward angle (u-channel) scattering provides complementary information for studies of hadron spectroscopy and structure, but has been less comprehensively studied than the corres…

Determination of the pole position of the lightest hybrid meson candidate

JPAC Collaboration, A. Rodas, A. Pilloni +9

Mapping states with explicit gluonic degrees of freedom in the light sector is a challenge, and has led to controversies in the past. In particular, the experiments have reported t…

hep-ph2015

Dispersive Analysis of $Ï/Ï\rightarrow 3Ï,\,ÏÎ³^*$

I. V. Danilkin, C. FernÃ¡ndez-RamÃrez, P. Guo +4

The decays $I ¨ / I ¨ \to 3 I ¨ $ are considered in the dispersive framework that is based on the isobar decomposition and sub-energy unitarity. The inelastic contributions are par…

Nucleon resonance contributions to unpolarised inclusive electron scattering

A. N. Hiller Blin, V. Mokeev, M. Albaladejo +8

The first CLAS12 experiments will provide high-precision data on inclusive electron scattering observables at a photon virtuality $Q^{2}$ ranging from 0.05 GeV $^{2}$ to 12 GeV $^{2}$ and…

hep-ph2022

Deep Learning Exotic Hadrons

JPAC Collaboration, L. Ng, L. Bibrzycki +6

We perform the first model independent analysis of experimental data using Deep Neural Networks to determine the nature of an exotic hadron. Specifically, we study the line shape o…

hep-ex2026

Hadron Physics Opportunities at FAIR

J. G. Messchendorp, F. Nerling, P. Achenbach +103

This White Paper outlines a coordinated, decade-spanning programme of hadron and QCD studies anchored at the GSI/FAIR accelerator complex. Profiting from intense deuteron, proton a…

Vector Meson Photoproduction with a Linearly Polarized Beam

JPAC Collaboration, V. Mathieu, J. Nys +6

We propose a model based on Regge theory to describe photoproduction of light vector mesons. We fit the SLAC data and make predictions for the energy and momentum transfer dependen…

hep-ph2025

Nonperturbative aspects of the electromagnetic pion form factor at high energies

Joint Physics Analysis Center, :, K. Quirion +10

The structure of hadronic form factors at high energies and their deviations from perturbative quantum chromodynamics provide insight on nonperturbative dynamics. Using an approach…

hep-ph2023

Ambiguities in Partial Wave Analysis of Two Spinless Meson Photoproduction

JPAC Collaboration, W. A. Smith, D. I. Glazier +13

We describe the formalism to analyze the mathematical ambiguities arising in partial-wave analysis of two spinless mesons produced with a linearly polarized photon beam. We show th…

Analyticity Constraints for Hadron Amplitudes: Going High to Heal Low Energy Issues

JPAC Collaboration, V. Mathieu, J. Nys +7

Analyticity constitutes a rigid constraint on hadron scattering amplitudes. This property is used to relate models in different energy regimes. Using meson photoproduction as a ben…

hep-ph2022

XYZ spectroscopy at electron-hadron facilities II: Semi-inclusive processes with pion exchange

JPAC Collaboration, D. Winney, A. Pilloni +5

Semi-inclusive processes are very promising to investigate $X Y Z$ hadrons at the next generation of electron-hadron facilities, because they generally boast higher cross sections. W…

Khuri-Treiman equations for $3 I ¨ $ decays of particles with spin

JPAC Collaboration, M. Albaladejo, D. Winney +7

Khuri-Treiman equations have proven to be a useful theoretical tool in the analysis of 3-body decays, specially into the $3 I ¨ $ final state. In this work we present in full detail t…

hep-ph2015

Analysis Tools for Next-Generation Hadron Spectroscopy Experiments

M. Battaglieri, B. J. Briscoe, A. Celentano +44

The series of workshops on New Partial-Wave Analysis Tools for Next-Generation Hadron Spectroscopy Experiments was initiated with the ATHOS 2012 meeting, which took place in Camogl…

Amplitude analysis and the nature of the Zc(3900)

JPAC Collaboration, A. Pilloni, C. Fernandez-Ramirez +5

The microscopic nature of the XYZ states remains an unsettled topic. We show how a thorough amplitude analysis of the data can help constraining models of these states. Specificall…

physics.ins-det2021

Science Requirements and Detector Concepts for the Electron-Ion Collider: EIC Yellow Report

R. Abdul Khalek, A. Accardi, J. Adam +410

This report describes the physics case, the resulting detector requirements, and the evolving detector concepts for the experimental program at the Electron-Ion Collider (EIC). The…

hep-ph2014

The Boltzmann Equation in Classical Yang-Mills Theory

V. Mathieu, A. H. Mueller, D. N. Triantafyllopoulos

We give a detailed derivation of the Boltzmann equation, and in particular its collision integral, in classical field theory. We first carry this out in a scalar theory with both c…

hep-ph2021

Scalar and tensor resonances in $J / I ¨ $ radiative decays

JPAC Collaboration, A. Rodas, A. Pilloni +4

We perform a systematic analysis of the $J / I ¨ \to I^^{3} I ¨ ^{0} I ¨ ^{0}$ and $\to I^^{3} K_{S}^{0} K_{S}^{0}$ partial waves measured by BESIII. We use a large set of amplitude parametrizations to reduce th…

hep-ph2011

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…

hep-ph2023

Khuri-Treiman analysis of $J / I ¨ \to I ¨ ^{+} I ¨ ^{-} I ¨ ^{0}$

JPAC Collaboration, M. Albaladejo, S. GonzÃ lez-SolÃs +12

We study the decay $J / I ¨ \to I ¨ ^{+} I ¨ ^{-} I ¨ ^{0}$ within the framework of the Khuri-Treiman equations. We find that the BESIII experimental di-pion mass distribution in the $I ¨ (770)$ -…

hep-ph2021

$I ¨ ^{-} p \to I^\cdot^{(')} I ¨ ^{-} p$ in the double-Regge region

JPAC Collaboration, L. Bibrzycki, C. Fernandez-Ramirez +6

The production of $I^\cdot^{(')} I ¨ $ pairs constitutes one of the golden channels to search for hybrid exotics, with explicit gluonic degrees of freedom. Understanding the dynamics…

Structure of Pion Photoproduction Amplitudes

V. Mathieu, J. Nys, C. Fernandez-Ramirez +5

We derive and apply the finite energy sum rules to pion photoproduction. We evaluate the low energy part of the sum rules using several state-of-the-art models. We show how the dif…

Gluons in glueballs: Spin or helicity?

V. Mathieu, F. Buisseret, C. Semay

In the last decade, lattice QCD has been able to compute the low-lying glueball spectrum with accuracy. Like other effective approaches of QCD, potential models still have difficul…

What is the right formalism to search for resonances? II. The pentaquark chain

JPAC Collaboration, A. Pilloni, J. Nys +8

We discuss the differences between several partial-wave analysis formalisms used in the construction of three-body decay amplitudes involving fermions. Specifically, we consider th…

hep-ph2011

Massless bound-state excitations and the Schwinger mechanism in QCD

A. C. Aguilar, D. IbÃ¡Ã±ez, V. Mathieu +1

The gauge invariant generation of an effective gluon mass proceeds through the well-known Schwinger mechanism, whose key dynamical ingredient is the nonperturbative formation of lo…

hep-ph2007

Modified Newton's law, braneworlds, and the gravitational quantum well

F. Buisseret, B. Silvestre-Brac, V. Mathieu

Most of the theories involving extra dimensions assume that only the gravitational interaction can propagate in them. In such approaches, called brane world models, the effective,…

Workshop on Pion-Kaon Interactions (PKI2018) Mini-Proceedings. Editors: M. Amaryan, Ulf-G. MeiÃner, C. Meyer, J. Ritman, and I. Strakovsky

M. Amaryan, M. Baalouch, G. Colangelo +21

This volume is a short summary of talks given at the PKI2018 Workshop organized to discuss current status and future prospects of pi-K interactions. The precise data on pi-K intera…

Global analysis of charge exchange meson production at high energies

JPAC Collaboration, J. Nys, A. N. Hiller Blin +7

Many experiments that are conducted to study the hadron spectrum rely on peripheral resonance production. Hereby, the rapidity gap allows the process to be viewed as an independent…

Constituent gluon interpretation of glueballs and gluelumps

N. Boulanger, F. Buisseret, V. Mathieu +1

Arguments are given that support the interpretation of the lattice QCD glueball and gluelump spectra in terms of bound states of massless constituent gluons with helicity-1. In thi…

hep-ex2018

Photoproduction of $K^{+} K^{-}$ meson pairs on the proton

S. Lombardo, M. Battaglieri, A. Celentano +13

The exclusive reaction $I^^{3} p \to p K^{+} K^{-}$ was studied in the photon energy range $3.0 - 3.8 \mbox{ GeV}$ and momentum transfer range $0.6<-t<1.3 \mbox{ GeV}^2$. Data were collecte…

hep-ph2016

Studying the P_c(4450) resonance in J/psi photoproduction off protons

A. N. Hiller Blin, C. FernÃ¡ndez-RamÃrez, A. Jackura +4

A resonance-like structure, the P_c(4450), has recently been observed in the J/psi p spectrum by the LHCb collaboration. We discuss the feasibility of detecting this structure in J…

$I ¨ \to 3 I ¨ $ and $I ¨ I ¨ ^{0}$ transition form factor revisited

M. Albaladejo, I. Danilkin, S. Gonzalez-Solis +7

In light of recent experimental results, we revisit the dispersive analysis of the $I ¨ \to 3 I ¨ $ decay amplitude and of the $I ¨ I ¨ ^{0}$ transition form factor. Within the framework of t…

nucl-ex2019

Mass-dependent cuts in longitudinal phase space

P. Pauli, D. I. Glazier, M. Battaglieri +7

Longitudinal phase space analyses as introduced by van Hove provided a simplified method of separating different reaction production mechanisms. Cuts in the longitudinal phase spac…

What is the right formalism to search for resonances?

JPAC Collaboration, M. Mikhasenko, A. Pilloni +8

Hadron decay chains constitute one of the main sources of information on the QCD spectrum. We discuss the differences between several partial wave analysis formalisms used in the l…

nucl-ex2017

Measurement of the beam asymmetry $I^£$ for $I ¨ ^{0}$ and $I^\cdot$ photoproduction on the proton at $E_{I^}^{3} = 9$ GeV

GlueX Collaboration, H. Al Ghoul, E. G. Anassontzis +123

We report measurements of the photon beam asymmetry $I^£$ for the reactions $I^^{3} p \to p I ¨ ^{0}$ and $I^^{3} p \to p I^\cdot$ from the GlueX experiment using a 9 GeV linearly-polarized, tagge…

Moments of Angular Distribution in Two Mesons Photoproduction

V. Mathieu

The formalism devoted to the production of two pseudoscalar mesons with a linearly polarized photon beam has been detailed and illustrated in Phys. Rev. D100 (2019) 054017. This do…

Khuri-Treiman equations for $I ¨ I ¨ $ scattering

JPAC Collaboration, M. Albaladejo, N. Sherrill +7

The Khuri-Treiman formalism models the partial-wave expansion of a scattering amplitude as a sum of three individual truncated series, capturing the low-energy dynamics of the dire…

Three-body final state interaction in $I^\cdot \to 3 I ¨ $ updated

P. Guo, I. V. Danilkin, C. FernÃ¡ndez-RamÃrez +2

In view of the recent high-statistic KLOE data for the $I^\cdot \to I ¨ ^{+} I ¨ ^{-} I ¨ ^{0}$ decay, a new determination of the quark mass double ratio has been done. Our approach relies on a disp…

hep-ph2006

String deformations induced by retardation effects

F. Buisseret, V. Mathieu, C. Semay

The rotating string model is an effective model of mesons, in which the quark and the antiquark are linked by a straight string. We previously developed a new framework to include…

hep-ph2012

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…

hep-ph2007

Excited flux tube from $q q ˉ g$ hybrid mesons

F. Buisseret, V. Mathieu, C. Semay +1

In the framework of quark models, hybrid mesons are either seen as two-body $q q ˉ$ systems with an excited flux tube connecting the quark to the antiquark or as three-body $q\ba…

hep-ph2006

Semirelativistic potential model for low-lying three-gluon glueballs

V. Mathieu, C. Semay, B. Silvestre-Brac

The three-gluon glueball states are studied with the generalization of a semirelativistic potential model giving good results for two-gluon glueballs. The Hamiltonian depends only…

nucl-ex2023

Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab

A. Accardi, P. Achenbach, D. Adhikari +441

This document presents the initial scientific case for upgrading the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (JLab) to 22 GeV. It is the result of a…

Finite-Energy Sum Rules in Eta Photoproduction off the Nucleon

JPAC Collaboration, J. Nys, V. Mathieu +8

The reaction $I^^{3} N \to I^\cdot N$ is studied in the high-energy regime (with photon lab energies $E_Î³^{\textrm{lab}} > 4$ GeV) using information from the resonance region through the use…