arXiv subjects

Grzegorz Kalicy

Publications and source records attributed to Grzegorz Kalicy.

3 recordsLinked to original sources

arXiv2026

A Second EIC Detector: Physics Case and Conceptual Design

This document is the closeout report for LDRD 23-050, a type-A LDRD project awarded in FY2022 under the title "A Second EIC Detector: Physics Case and Conceptual Design". The project was motivated by the strong interest within the EIC community in a second general-purpose detector and interaction region, and by the recognition that such a detector is essential to fully exploit the scientific potential of the EIC over its multi-decade lifetime. The key goals of the LDRD were to (i) strengthen the case for a second EIC detector, building on the community Yellow Report; (ii) develop a realistic detector concept complementary to the project detector, ePIC, in terms of physics reach, precision, and control of systematics; and (iii) broaden the overall EIC physics program. Since a possible second detector is expected to be realized with a delay of several years relative to the first detector, the project explicitly aimed at identifying technologies that are not yet sufficiently mature for ePIC but could be deployed on the later timescale of a second detector, thereby providing genuine complementarity and room for innovation. As envisioned in the original proposal, the expected outcome was a document detailing the physics potential and requirements of a second EIC detector, accompanied by a conceptual design and an outline of the remaining R&D needs. This report summarizes progress toward these goals, consolidating the physics studies, detector concepts, and technology assessments developed under this LDRD, and situating them within the broader context of worldwide detector R&D. Despite evolving EIC priorities and the effort devoted to ePIC, the work documented here is intended to provide a foundation and reference for future efforts toward a second detector. We hope this report will serve as a useful guide for colleagues advancing this program in the near- and mid-term future.

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arXiv2022

Decay of the $Λ(1405)$ Hyperon to $Σ^0π^0$ Measured at GlueX

Among the light baryons, the $J^π= \frac{1}{2}^-$ $Λ(1405)$ hyperon is an important special case as it sits just below the $N\bar{K}$ threshold and decays almost exclusively to $Σπ$. Some long-standing hypotheses for $Λ(1405)$ are that it could be a $N\bar{K}$ bound state or a $Σπ$ continuum resonance. It may also be considered as a simple quark-model resonance, the $P$-wave companion of the $Λ(1520)$. In recent years chiral unitary models have suggested that there are two isospin zero poles present in this mass region, and that the "line shape" of the $Λ(1405)$ depends to what extent each of the two poles are stimulated in a given reaction. Below the $N\bar{K}$ threshold, the $Λ(1405)$ decays to the three $Σπ$ charge combinations. The $Σ^{0}π^{0}$ mode is purely $I=0$ and it is uncontaminated by complications arising from $I=1$ scattering processes contributing to the reaction mechanism in the $Σ^{+}π^{-}$ and $Σ^{-}π^{+}$ decays. It is also not affected from production and decay of the nearby $Σ^{0}(1385)$ hyperon. The GlueX experiment at Jefferson Lab has been used to study the $Λ(1405) \to Σ^{0}π^{0}$ decay mode. We focus on the preliminary results of $dσ/dM_{Σ^{0}π^{0}}$ and fits to the line shape of the $Λ(1405)$ region in the $-(t-t_{min})$ range 0 - 1.5 GeV$^2$ from analyzing the reaction $γp \to K^{+}Λ^*$ using the data collected during the first phase of the GlueX program.

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arXiv2021

Strange Hadron Spectroscopy with Secondary KL Beam in Hall D

We propose to create a secondary beam of neutral kaons in Hall D at Jefferson Lab to be used with the GlueX experimental setup for strange hadron spectroscopy. The superior CEBAF electron beam will enable a flux on the order of $1\times 10^4~K_L/sec$, which exceeds the flux of that previously attained at SLAC by three orders of magnitude. The use of a deuteron target will provide first measurements ever with neutral kaons on neutrons. The experiment will measure both differential cross sections and self-analyzed polarizations of the produced $Λ$, $Σ$, $Ξ$, and $Ω$ hyperons using the GlueX detector at the Jefferson Lab Hall D. The measurements will span CM $\cosθ$ from $-0.95$ to 0.95 in the range W = 1490 MeV to 2500 MeV. The new data will significantly constrain the partial wave analyses and reduce model-dependent uncertainties in the extraction of the properties and pole positions of the strange hyperon resonances, and establish the orbitally excited multiplets in the spectra of the $Ξ$ and $Ω$ hyperons. Comparison with the corresponding multiplets in the spectra of the charm and bottom hyperons will provide insight into he accuracy of QCD-based calculations over a large range of masses. The proposed facility will have a defining impact in the strange meson sector through measurements of the final state $Kπ$ system up to 2 GeV invariant mass. This will allow the determination of pole positions and widths of all relevant $K^\ast(Kπ)$ $S$-,$P$-,$D$-,$F$-, and $G$-wave resonances, settle the question of the existence or nonexistence of scalar meson $κ/K_0^\ast(700)$ and improve the constrains on their pole parameters. Subsequently improving our knowledge of the low-lying scalar nonet in general.

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