sPHENIX is a state-of-the-art experiment at the Relativistic Heavy Ion Collider (RHIC),
dedicated on the study of heavy-flavor and jet physics. Its novel streaming-readout-capable,
precision tracking system allows for heavy-flavor measurements through high-statistics,
unbiased data samples with exceptional precisions. During the 2024 run, sPHENIX was fully
commissioned, collecting a sample...
Direct photon single spin asymmetries, 𝐴𝑁, have the advantage that they are not sensitive to final state effects and that the hard scattering process is predominantly quark-gluon scattering at RHIC energies.
Therefore, direct photons provide a clean probe to study the quark-gluon and tri-gluon correlations in single spin asymmetries, with the latter particularly hardly constrained at present....
The Electromagnetic Calorimeter (ECAL) is a key subdetector of the HADES (High Acceptance Di-Electron Spectrometer) experiment at SIS18, GSI Darmstadt. Its main purpose is the measurement of photons and electrons, enabling studies of neutral meson production, dielectron sources, and improved electron–hadron separation. A dedicated calibration campaign was performed using leptons from Au+Au...
The triple-differential yield as functions of the transverse momentum, the rapidity and the azimuthal angle relative to the estimated reaction plane is a critical observable for the collective-flow analysis in heavy-ion collisions. However, the triple-differential yield can be degraded by not only methodology to estimate reaction plane direction but also imperfect detector performance such as...
In this study, we investigate the properties of the $\phi N$ interaction and aim to determine its scattering length. Although the $\phi NN$ coupling is expected to be OZI-suppressed, coupled-channel analyses and the ALICE experiment indicate that it can be sizable. We explore possible $N^{*}$ resonances that can be produced in this reaction. We employ an effective Lagrangian approach and...
Silicon Photomultipliers (SiPMs), composed of arrays of avalanche photodiodes operating in Geiger mode, are widely used in particle and nuclear physics experiments due to their compact size, magnetic-field insensitivity, and low operating voltage compared to conventional photomultiplier tubes. However, their performance can degrade under neutron irradiation, potentially affecting experimental...
The Barrel Imaging Calorimeter (BIC) of the ePIC detector at the upcoming Electron–Ion Collider (EIC) consists of silicon pixel layers for precise shower profile measurements and a high-granularity sampling calorimeter of lead absorbers interleaved with scintillating fibers for energy measurement. This work focuses on the readout development for the sampling calorimeter section, where a...
The observation of exotic bottomonium-like states at Belle, BaBar, and LHCb motivates a detailed study of beauty-quark bound systems. We present a spectroscopy analysis of $B$ mesons and tetraquarks with quark content $b q \bar{q} \bar{q}$ in the diquark–antidiquark framework. Mass spectra are computed using a Cornell-type potential with color antitriplet–triplet configurations. Decay modes...
We investigate the production of the exotic hadron X(3872) within the coalescence model, assuming it is a $D\bar{D}^*$ molecular state. A basis transformation of the $D\bar{D}^*$ configuration shows that it is dominated $(\sim 90\%)$ by the $(q\bar{q})^{C=8} \otimes (c\bar{c})^{C=8}$ component, with a smaller color singlet-singlet component. Using this dominant color octet-octet configuration,...
We present the in-medium masses of the heavy quarkonium (charmonium and bottomonium) states in isospin asymmetric $\Delta$ resonance matter. We have considered nucleons ($n,p$) and delta baryons ($\Delta^{++},\Delta^{+},\Delta^{0}$, and $\Delta^{-}$) as the degree of freedom within the medium. The $J/\psi$ ($\Gamma$) self-energy is evaluated via the $D \bar D$ ($B \bar B$) meson loop, with...
Understanding the behavior of the nuclear symmetry energy at high baryon densities is crucial for constraining the nuclear equation of state, which plays a central role in both heavy-ion collision physics and astrophysical phenomena such as neutron stars. However, the symmetry energy at supra-saturation densities remains poorly constrained experimentally.
We present an analysis of...
Heavy-to-heavy semileptonic decays, particularly the bottom-to-charm quark transitions are essential for testing the Standard Model (SM) and extracting the the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements. These decays have been extensively studied using various theoretical approaches. In this work, we investigate the semileptonic decay $\Xi_b \to \Xi_c \ell^- \bar{\nu}_\ell$ (where $\ell =...
Investigating the baryon excitation spectrum is essential for understanding the internal dynamics of baryons and quantum chromodynamics (QCD) in the non-perturbative regime. However, it is challenging to identify all baryon resonances and determine their properties due to their short lifetimes, which result in broad and overlapping resonances. The measurement of polarization observables is...
Baryon spectroscopy has the aim to map out the full spectrum of baryon resonances and understand their properties, which requires precise data from both proton and neutron targets. However, most available data to date has been obtained using proton targets. Since some resonances may couple more strongly to neutrons than to protons, neutron-target experiments are essential for a complete...
In relativistic heavy-ion collisions, the quark-gluon plasma is created, and as the medium cools down, the system transitions into a hadronic phase. While such interactions are well established for large systems, such as Pb-Pb collisions, their relevance in smaller collision systems remains unclear. Therefore, we analyse pp collisions at $\sqrt{s}=13$ TeV and p-Pb collisions at...
Recently, ALICE observed that the production of the short-lived resonance $K^*(892)$ is reduced in high multiplicity pp collisions compared to its ground state $K^\pm$, while long-lived resonances like $\phi(1020)$ exhibit no multiplicity dependence. This reduction is attributed to the decay product undergoing hadronic interactions within the hadron gas phase. This phenomenon, termed...
