An open question in hadronic phenomenology concerns the "unquenching" effects of higher Fock space components on the leading Fock space description of hadrons. In a paper by Eric Swanson (UPitt, co-PI), in collaboration with Muhammad Atif Sultan (Punjab U.), Wei Hao, and Lei Chang (Nankai U.), we address this by comparing the bottomonium spectrum as computed with the relativized Godfrey-Isgur quark model and an unquenched coupled channel model driven by the ${}^3P_0$ mechanism of hadronic Read more

Shahriyar Jafarzade (ASU, ExoHad postdoc), in collaboration with Francesco Giacosa (JKU), Péter Kovács (Wigner RCP) investigated the spectrum of both ordinary and exotic mesons within the framework of the extended Linear Sigma Model (eLSM). The model includes scalar, pseudoscalar, vector, axial-vector, and higher-spin mesons, enabling a comprehensive description of light mesons with quantum numbers $J = 0$, $1$, $2$, and $3$. Beyond conventional quark-antiquark configurations, the eLSM Read more

In a paper led by Gernot Eichmann (Graz U., co-PI), in collaboration with Maria Teresa Peña (IST Lisbon) and Raul Torres (IST Lisbon), we extend the Bethe-Salpeter formalism to systems composed of five valence particles. To make the calculations manageable, we implement properties of the permutation group S5 and construct an approximation based on intermediate two- and three-body poles. We extract the five-body ground and excited states, along with the spectra obtained from the two-, three-, Read more

In two publications, led by Steve Sharpe (UW, co-PI), in collaboration with Sebastian Dawid (UW), Zach Draper (UW), Andrew Hanlon (Kent State U. and Hampton U.), Ben Hörz (Intel DE), Colin Morningstar (CMU), Fernando Romero-López (Bern U.), and Sarah Skinner (CMU), we determine, for the first time, three-particle scattering amplitudes with physical quark masses. These amplitudes derive from the finite-volume spectra of systems of two and three mesons obtained using lattice QCD Read more

Michael Döring (GWU, co-PI) in collaboration with Johann Haidenbauer (Julich), Maxim Mai (Bern U.), and Toru Sato (Osaka U.) have completed a review commissioned for "Progress in Particle and Nuclear Physics". The manuscript discusses the development and application of a specific class of models for extracting amplitudes and resonance content from a wide range of data across various physical contexts. This is one of the stated aims of the ExoHad: collaboration and contributes to its Read more