Bulletin of the American Physical Society
2021 Annual Meeting of the APS Four Corners Section
Volume 66, Number 11
Friday–Saturday, October 8–9, 2021; Virtual; Mountain Daylight Time
Session K04: Nuclear Physics |
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Chair: Barry Ritchie, Arizona State University |
Saturday, October 9, 2021 1:00PM - 1:24PM |
K04.00001: Jet Drift in Flowing Nuclear Media Invited Speaker: Matthew Sievert Jets have long been envisioned as a source of tomographic information about hot and cold nuclear media, with signatures such as their energy loss, acoplanarities, and substructure encoding information about the microscopic details of the medium. The theory fundamentally relies on a significant separation of scales in which the jet energy far exceeds the temperature and other characteristic scales of the nuclear medium. In the strict limit under which these formulas are derived, the constituents of the medium are effectively static, with corrections sensitive to the motion of medium particles being suppressed by the jet energy. In this talk, we report on a new calculation of these energy-suppressed corrections which are sensitive to the velocity distribution of the medium. We show that these corrections lead to significant qualitative modifications of the usual jet-medium interactions, including collisional energy gain or loss, direction-dependent shifts in the scattering cross section, and new types of quantum interference phases. The result, applicable both to heavy-ion collisions and to cold nuclear matter at the Electron-Ion Collider, is a drift effect which drags the jet in the direction of the velocity field and alters the angular distribution of its radiation pattern. [Preview Abstract] |
Saturday, October 9, 2021 1:24PM - 1:36PM |
K04.00002: The D-Term: Pressure To Find The Last Item On The Checklist Andrew Dotson, Matthias Burkardt, Marc Schlegel, Matthew Sievert The D-term is an interesting property of matter that has received a comparatively small amount of research dedicated to it compared to other global properties such as mass and spin. We discuss its potential connection to pressure and shear force distributions inside the nucleon, and provide possible means of extracting this form factor both theoretically and experimentally. We also provide a model calculation of both the A-term and D-term in $\phi^3 $ theory, which required the modification of the energy-momentum tensor from its canonical definition to a renormalized "Improved" energy-momentum tensor. [Preview Abstract] |
Saturday, October 9, 2021 1:36PM - 1:48PM |
K04.00003: QGP Tomographic Prospects from Photon-Jet Acoplanarities Joseph Bahder We discuss a new photon-jet acoplanarity observable we label “Jet Drift” and demonstrate its use as a tomographic instrument capable of recovering information about the velocity fields of the Quark-Gluon Plasma. We discuss the fundamentals of the observable and the geometric coupling of its jet production angle dependence with the velocity field of the medium. Numerical simulations are presented to evaluate the ability to reconstruct this dependence from event-by-event correlation analysis in real-world experiments at present and future facilities. Finally, a brief discussion of the detectability of the effect motivates further investment in anisotropic observables as tools for model differentiation and QGP tomography. [Preview Abstract] |
Saturday, October 9, 2021 1:48PM - 2:00PM |
K04.00004: Exact Speed of Sound for all $T$, $\mu$ at Large $N$ Max Weiner We calculate the exact speed of sound for all $T$, $\mu$ in the large $N$ limit for the Gross-Neveu (GN) model in 2+1 dimensions utilizing a non-perturbative field theory technique. At large $N$, the GN model has a chiral symmetric and broken phase separated by a cross-over and critical point at $T=0$. We discuss the behavior of the speed of sound in the whole $T,\mu$ plane numerically without any approximations or conjectures (except for large $N$). We find that the speed of sound displays non-monotonic behavior and exhibits a discontinuity across the critical line. If time allows, potential lessons for QCD will be discussed. [Preview Abstract] |
Saturday, October 9, 2021 2:00PM - 2:12PM |
K04.00005: Search for High-Mass Resonances Decaying to K Lamda* Rebecca Osar In nuclear particle physics, there is a discrepancy between theory and experiment concerning the numbers of existing nucleon resonances. Current models of nucleon resonances predict far more states than have been observed. To investigate this problem, $\Lambda $(1520) baryons are reconstructed from a K- and a proton from the CLAS12 detector. Using the reaction ep$\to $K$+$K-p with electrons of energy 10 GeV, the invariant mass of the K$+ \quad \Lambda $(1520) system is used to determine yields, which are adjusted using efficiency corrections calculated from Monte Carlo simulation. The corrected yields of the K$+ \quad \Lambda $(1520) system assist in uncovering the resonance spectrum. In this presentation, efficiency-corrected yields in terms of the center-of-mass energy W for the K$+ \quad \Lambda $(1520) system in the range W $=$ 2 to 5 GeV will be presented. [Preview Abstract] |
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