Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session ME: Undergraduate Research II |
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Chair: Christine Aidala, University of Michigan Room: Park & Scollay |
Wednesday, October 13, 2021 4:00PM - 4:12PM |
ME.00001: Looking for colour entanglement in p+p collisions in LHCb kinematics Joseph Ryan, Jordan D Roth, Christine Aidala In QCD, factorisation theorems play a crucial role in calculating high energy cross sections by separating the process-dependent perturbatively-calculable short-range partonic cross section, and the universal parton distribution functions. In certain processes, colour entanglement of partons across colliding protons is expected to prevent the application of factorisation theorems. In order to detect colour entanglement in p+p collisions we are looking for an anomalous hard energy scale dependence of small transverse momentum widths in Z+jet production. Thus, we will need control observables for p+p collisions. Our objective is to determine whether or not inclusive Z production can be used to control Z+jets; the former of which is not expected to produce colour entanglement unlike the latter. To that end, we are establishing the relationship between observables for these two processes using simulated data from the Pythia Monte Carlo generator. Precisely, we are comparing the distribution of incoming parton momentum fractions, and we are looking at the relationship between the small transverse momentum distributions accessible in the two processes. |
Wednesday, October 13, 2021 4:12PM - 4:24PM |
ME.00002: Simulating quark and gluon momentum fraction coverage of observables at PHENIX and sPHENIX using PYTHIA8 Christopher W Platte, Devon Loomis, Christine Aidala The Relativistic Heavy Ion Collider (RHIC) is the only polarized proton collider and thus plays a critical role in improving our understanding of Quantum Chromodynamics, the fundamental theory of the strong interaction between quarks and gluons. These particles, collectively known as partons, have the unique property of exhibiting asymptotic freedom, in which the interaction decreases at high energies, leading to approximately free partons within the proton. Parton distribution functions (PDFs) are utilized to determine the probability of scattering off of these partons at a given momentum fraction and energy scale within the proton. The calculation of these PDFs relies heavily on experimental input from a wide range of observables. At RHIC, observables important for constraining PDFs have been measured by the PHENIX experiment and will be measured by the upcoming sPHENIX experiment. To further understand the full impact of these studies, proton collisions at RHIC energies are simulated to construct the momentum fraction coverage of recent PHENIX and proposed sPHENIX measurements using PYTHIA8. |
Wednesday, October 13, 2021 4:24PM - 4:36PM |
ME.00003: Updated QCD Global Analysis of Single Transverse-Spin Asymmetries Michel J Malda, Joshua A Miller, Daniel Pitonyak, Alexei Prokudin, Nobuo Sato By developing a computational framework to analyze high-energy transverse single-spin asymmetry data, we have been able to study the 3D structure of hadrons through the extraction of transverse momentum dependent parton distribution functions and fragmentation functions (TMDs). Different observables, such as semi-inclusive lepton-nucleon deep inelastic scattering, electron-positron annihilation, and proton-proton collisions, provide insight to interactions that occur within hadrons. With the publication of new data from HERMES and STAR providing further constraints on the TMDs in our model, we are interested in comparing our previous analysis to a new global fit. We also incorporated lattice data on the nucleon tensor charge to provide additional constraints on the transversity function. The new data from HERMES and STAR introduces sensitivity to a novel quark-gluon-quark fragmentation function. With this new global fit, we will gain a greater understanding of these observables and the 3D structure of hadrons. |
Wednesday, October 13, 2021 4:36PM - 4:48PM |
ME.00004: Investigation Into Improving CUORE Energy Reconstruction Using Principal Component Analysis Elettra A Preosti The Cryogenic Underground Observatory for Rare Events (CUORE), located in the Laboratori Nazionali del Gran Sasso in Italy, is an experiment searching for the neutrinoless double-beta decay (0νββ) of 130Te. Observing neutrinoless double-beta decay would have a number of implications, including indicating that neutrinos are their own antiparticle. This would in turn indicate that Lepton number is not conserved and help explain why there is more matter than antimatter in the known universe. In this talk, we present a first investigation into the use of machine learning models and in particular, Principal Component Analysis, to improve energy reconstruction for the CUORE experiment. Sensitivity to 0νββ in the background dominated regime is limited by fluctuations in the background and signal energy resolution. Excellent energy resolution is critical for CUORE as it helps to more clearly distinguish 0νββ signals from background events.The current method of energy reconstruction, optimal filter, assumes that noise is stationary (i.e. does not change during the pulse) and that signals from different energies have the same pulse shape (linear response), which we know is not true for the CUORE experiment. Thus, taking into account these factors using PCA could lead to an improved model for energy reconstruction. In addition, the techniques we are developing could be employed in the next generation experiment CUPID to help reach an unprecedented sensitivity to 0νββ. |
Wednesday, October 13, 2021 4:48PM - 5:00PM |
ME.00005: LC Circuits for Direct Detection of Ultralight Dark Matter Christopher M Donohue, Susan V Gardner, Wolfgang K Korsch The modification of electrodynamics in the presence of ultralight axion-like dark matter (DM) |
Wednesday, October 13, 2021 5:00PM - 5:12PM |
ME.00006: Systematics of Inverse-Beta-Decay antineutrino yields Grace A Farrell
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Wednesday, October 13, 2021 5:12PM - 5:24PM |
ME.00007: Performance Characterization of sPHENIX Hadronic Calorimeter Scintillating Tiles Jacob T Tutterow We are studying the performance characterization of sPHENIX Hadronic Calorimeter (HCal) scintillating tiles. sPHENIX will be installed in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Lab (BNL). It's goal is to probe the hot, dense state of nuclear matter known as quark gluon plasma using heavy ion collisions. The HCal will measure the energy of outgoing hadrons resulting from these collisions. The tiles that compose the HCal scintillate when hit by a particle, and that light is collected by a wavelength shifting fiber. The fiber directs the light to an SiPM, who's signal is grouped into calorimeter towers. To improve energy resolution, sPHENIX requires the towers to have tiles of similar light yield. The tiles are tested using cosmic rays to determine performance characteristics. Once they are tested, they are shipped to BNL and placed between absorber plates. sPHENIX is on schedule to take its first data in early 2023. This talk will present the status of the HCal tile testing and assembly. |
Wednesday, October 13, 2021 5:24PM - 5:36PM |
ME.00008: Jet-Flow Tomography from Photon-Jet Acoplanarities Matthew D Sievert, Logan M Antiporda, Hasan R Rahman, Joseph Bahder Using a recently-derived theoretical framework to describe the coupling of jets to the velocity distribution in a nuclear medium, we consider the implications for photon-jet acoplanarities in heavy-ion collisions. For a jet propagating in a large uniform slab of plasma, we find that the jet is deflected towards alignment parallel to the direction of the velocity, with the magnitude and direction of the jet deflection carrying significant information about the velocity field. We show that the pattern of angular deflection carries sufficient information to reconstruct both the direction and the magnitude of the velocity. In addition, we find that the time dependence of the deflection along the jet trajectory is also sensitive to the magnitude of the velocity. When applied to the elliptical geometries produced in non-central heavy-ion collisions, this leads to a strong coupling of the photon-jet acoplanarity to the elliptic flow of the plasma itself, and we propose measurements at sPHENIX which may be able to confirm these predictions. |
Wednesday, October 13, 2021 5:36PM - 5:48PM |
ME.00009: Development of Least Squares Fitting Routines for Real Time GHz Scale Waveform Analysis Lars Hebenstiel, Yuke Wang, Christopher B Crawford The next generation of hadronic parity violation experiments like NDTγ will require ~10^15 photon events with individually resolved energies to reject background radiation. With recent advances, it is now possible to achieve high energy resolution in real time by doing least squares fitting on the FPGA using an approximate formulation of the algorithm. The accuracy can further be increased by accounting for the covariance of the waveform data. I will report on the implementation of recursive piecewise polynomials used in this algorithm, and new techniques for minimizing the realistic χ^2 on the FPGA. |
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