Bulletin of the American Physical Society
Fall 2022 Meeting of the APS Division of Nuclear Physics
Volume 67, Number 17
Thursday–Sunday, October 27–30, 2022; Time Zone: Central Daylight Time, USA; New Orleans, Louisiana
Session LF: Future Facilities and Measurements in Heavy-ion Collisions |
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Chair: Peter Steinberg, Brookhaven National Laboratory Room: Hyatt Regency Hotel Celestin F |
Saturday, October 29, 2022 2:00PM - 2:12PM |
LF.00001: sPHENIX MVTX Detector Commissioning at Brookhaven National Laboratory Zhaozhong Shi, Ming X Liu sPHENIX is a state-of-the-art detector for jet and heavy flavor physics in heavy-ion collisions and going to take data at Relativistic Heavy Ion Collider in 2023. The three-layer Monolithic-Active-Pixel-Sensor (MAPS) based vertex detector (MVTX), a copy of the inner three layers from the ALICE experiment at the Large Hadron Collider, will serveas the innermost tracking system of the sPHENIX experiment. The sPHENIX MVTX detector has excellent position resolution and vertexing capabilities, which is crucial for heavy flavor physics studies. Currently, the MVTX commissioning is ongoing at BNL. Tasks such as hardware test, online system, detector simulation, and alignment studies are undertaking. MVTX will be installed to the sPHENIX detector from Jan to Feb 2023 right before data taking. In the presentation. we will report the current status of sPHENIX commissioning and the plan before data taking. |
Saturday, October 29, 2022 2:12PM - 2:24PM |
LF.00002: sPHENIX Heavy Flavor Physics Simulation Performance Zhaozhong Shi Heavy flavor physics is one of the four main physics programs of the sPHENIX experiment. MVTX is the innermost of the sPHENIX detector that provides excellent position resolution and ultrafast timing resolution to reconstruct secondary vertices of heavy flavor hadron decay. With the precision vertexing performance of MVTX detector and the application of machining algorithm in online trigger and offline analyses, sPHENIX will have excellent capabilities of performing heavy flavor physics measurements. In particular, so far, fully reconstructed b-hadron from exclusive decays has not yet been achieved at RHIC and is crucial to understand the fundamental properties of quark-gluon plasma and heavy quark hadronization mechanisms in different collision systems. In this presentation, We will also report the projected performance of several sPHENIX heavy flavor physics measurements from Mock Data Challenge and discuss the relevant physics. |
Saturday, October 29, 2022 2:24PM - 2:36PM |
LF.00003: An Overview of the sPHENIX Event Plane Detector Tristan L Protzman The volume and shape of quark gluon plasma produced in heavy-ion collisions at the Relativistic Heavy Ion Collier are correlated with the final state particles and are defined by the centrality and event plane. One system providing the capability to determine the centrality and event plane of collisions at the sPHENIX detector will be the Event Plane Detector (sEPD). The sEPD will consist of two segmented disks of scintillating plastic covering a pseudorapidity of 2.0 to 4.9. In this talk, the expected operation and performance of the sEPD will be outlined. A case for measuring centrality and the event plane in the forward region will be presented. Additionally, select planned measurements to be made at sPHENIX utilizing the sEPD will be discussed. |
Saturday, October 29, 2022 2:36PM - 2:48PM |
LF.00004: Construction of the sPHENIX Event Plane Detector Valerie E Wolfe Constructed at Lehigh University between 2021 and 2022, the sPHENIX Event Plane Detector (sEPD) will detect charged particles at forward rapidity from the collision of hadrons. This detector consists of 744 tiles of plastic scintillator arranged into 24 triangular sectors. These sectors will be installed into two disks covering a pseudorapidity of 2.1 < |eta| < 4.9 . To build the detector, wavelength shifting fiber was assembled into bundles, and then glued into the sector, such that light could be collected from a discrete area of the detector then converted later to an electronic signal. This talk will cover the construction process of the sEPD, including the machining of the sectors, the installation of the fibers in the tiles, and the creation of two types of bundles of fiber optic assemblies. |
Saturday, October 29, 2022 2:48PM - 3:00PM |
LF.00005: sPHENIX EMCal Calibrations and Reconstruction for Prompt Photon-Related Measurements Justin Frantz, Justin Bryan, Shyam Chauhan sPHENIX, which will soon start data-taking, is poised to take maximal advantage of the high statistics of the last long datasets of RHIC especially in the arena of hard scattered, prompt photon-related physics with high precision. In this talk we present techniques that have been developed for the calibrations and data reconstruction of the sPHENIX Electromagnetic Calorimeter. The methods for calibration include a variety of hardware and data-driven techniques. Additionally, selected topics related to the reconstruction and analysis of prompt photon-related physics using the sPHENIX calorimeter systems will be discussed. |
Saturday, October 29, 2022 3:00PM - 3:12PM |
LF.00006: Dielectron Measurements from the STAR BES-II Program: Status and Future Opportunities Yiding Han Dileptons are excellent probes of the hot and dense QCD matter created in relativistic heavy-ion collisions because of their negligible interactions with the medium. Dileptons are emitted from the early to final stages of the collision. Among these, thermal dileptons from the hot QCD medium are of particular interest. In the intermediate-mass range (IMR, Mφ<Mll<MJ/ψ), thermal dileptons can reveal the temperature of the deconfined QCD matter (Quark-Gluon Plasma); in the low mass range (LMR, Mll<Mφ ), the in-medium ρ meson spectra can probe the temperature of the QCD matter at hadronic phase and the effects of chiral symmetry restoration. Additionally, measurements in the very low mass range could provide access to direct virtual photons. |
Saturday, October 29, 2022 3:12PM - 3:24PM |
LF.00007: ALICE 3: a next-generation heavy-ion experiment for the LHC Mateusz A Ploskon ALICE 3 is proposed as the next-generation experiment for the heavy-ion program at the LHC Run 5 and 6. The goals of ALICE 3 include measurements of thermal dileptons to probe the time-evolution of the temperature of the Quark Gluon Plasma and to understand the dynamical realization of chiral symmetry restoration. ALICE 3 also aims to understand the interactions of heavy charm and beauty quarks with the plasma probing the plasma properties and to understand how thermal equilibrium is approached and what the impact of hadronization effects is on these probes. To achieve these goals, a next-generation experiment with a lightweight high-resolution tracking system with unique pointing resolution complemented with a time-of-flight detector and ring-imaging Cherenkov detector system to provide electron and hadron identification capabilities over a wide momentum range are being proposed. A muon identification system with low pt reach and an electromagnetic calorimeter are foreseen for measurements of quarkonia and exotic hadrons and a dedicated forward detector for ultra-soft photons, is also proposed. I will review the physics program and the planned detector systems and present performance studies for ALICE 3. |
Saturday, October 29, 2022 3:24PM - 3:36PM |
LF.00008: A New Soft Particle Tracker for Gluon Saturation Studies at LHCb Arielle Platero One of the most intriguing features of Quantum Chromodynamics is the possibility of gluon saturated matter. This theorized new state of matter would be a strong force condensate, much like the Bose-Einstein Condensates seen at the atomic level. In order to detect the effects of saturated gluons in particle colliders, a particle detector must be able to measure soft particle production in the forward direction relative to the beamline. The LHCb experiment at the LHC is an excellent candidate for detecting this potential phenomenon. The Magnet Station, a new soft particle tracking detector, has been designed for installation inside the LHCb magnet. This new detector can access particles within the expected gluon saturation region. In this talk, the physics and detector concepts behind the Magnet Station, along with the development status, will be presented. |
Saturday, October 29, 2022 3:36PM - 3:48PM |
LF.00009: Toward An Analysis of Direct Photons in Pb-Pb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV in the ALICE experiment Evan Craft Usually quarks and gluons are confined to hadrons and cannot be directly observed. But under extreme temperatures and pressure, Quantum Chromodynamics (QCD) predicts a phase transition from normal hadronic matter to one in which color charges can flow freely. This deconfined partonic state, referred to as the Quark Gluon Plasma (QGP), holds a wealth of interesting information and a full understanding of the QGP is a major objective in the experimental research program at the Large Hadron Collider (LHC). Our analysis will be specifically focused on direct photons, defined as photons not originating from hadronic decays. Unlike hadrons, these photons are produced at all stages of the collision and escape from hot nuclear matter virtually unaffected. This is because photons are colorless and therefore have a mean free path greater than the size of the created fireball. These photons are therefore sensitive to information on the initial temperature and space-time evolution of the thermalized medium created in heavy-ion collisions. Their dynamics, however, are not fully understood, and a more complete understanding of their properties will significantly further our understanding of the Quark-Gluon Plasma as a whole. In this talk, we will present progress towards extracting results on direct photons within and outside of jets from $\sqrt{s_{NN}}$ = 5.02 TeV Pb-Pb collisions recorded at ALICE in 2018. These photons are identified via the photon conversion method, along with a jet-finder, allowing us to study the association of low momentum photons with reconstructed jets. |
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