Bulletin of the American Physical Society
2020 Fall Meeting of the APS Division of Nuclear Physics
Volume 65, Number 12
Thursday–Sunday, October 29–November 1 2020; Time Zone: Central Time, USA
Session MQ: Mini-Symposium: U.S.-based Electron-Ion Collider: Physics and Detectors III |
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Chair: Christopher Lee, LANL |
Saturday, October 31, 2020 2:00PM - 2:12PM |
MQ.00001: Gluon Generalized Parton Distributions in Nucleons and Nuclei Simonetta Liuti, Brandon Kriesten, Abha Rajan We study the behavior of gluon generalized parton distributions (GPDs) in nucleons and nuclei using a parametrization based on a reggeized spectator model. Constraints on the parametrization are obtained from recent form factor lattice QCD calculations, as well as from deep inelastic parton distribution functions. NLO QCD evolution in the kinematic range of $10^{-4} \leq x_{Bj} \leq 0.1$, $1 \, {\rm GeV}^2 \leq Q^2 \leq 100 \, {\rm GeV}^2$, and $-t \leq 1 \, {\rm GeV}^2$, accessible at the electron ion collider, is studied as a means to extract gluon GPDs from experimental data on both Deeply Virtual Compton Scattering (DVCS) and Timelike Compton Scattering (TCS) observables. [Preview Abstract] |
Saturday, October 31, 2020 2:12PM - 2:24PM |
MQ.00002: Precision physics with lepton-proton and lepton-nucleus collisions at the EIC Ivan Vitev A future electron-ion collider will provide unprecedented opportunities to study the internal structure of nucleons and nuclei, carry out precision tests of QCD, and understand the physics of hadronization. To support such broad and impactful program, new theoretical developments are required. In this talk I will cover a spectrum of recent advances in the QCD description of lepton-proton and lepton-nucleus collisions at the EIC. In e$+$p reactions I will present the most accurate calculation of the transverse-energy-energy correlation event shape variable in deep-inelastic scattering. In the framework of soft-collinear effective theory the highest perturbative next-to-next-to-next-to-leading logarithmic accuracy matched with the next-to-leading order cross section for the production of a lepton and two jets has been achieved. This advancement provides a new way to precisely study TMD physics at the EIC. In e$+$A collisions the physics of hadronization and parton energy loss can be studied via heavy flavor meson production at the EIC. I will show the first calculation of D meson and B meson production in DIS reactions with nuclei. A detailed next-to-leading order analysis has allowed us to identify the center-of-mass energies and kinematic domains where nuclear effects are most pronounced. I will discuss the constraints on the transport properties of cold nuclear matter and the insights on in the non-perturbative physics of hadron formation that are not possible with light hadrons, such as the ones measured by the HERMES experiment at HERA. [Preview Abstract] |
Saturday, October 31, 2020 2:24PM - 2:36PM |
MQ.00003: Search for Charged Lepton Flavor Violation at the Electron-Ion Collider Jinlong Zhang, Abhay Deshpande, Jin Huang, Krishna Kumar, Yuxiang Zhao In the Standard Model of Physics (SM) associated with every conservation law there exists a symmetry. While no such symmetry associated with conservation of charge lepton flavors (CLF) has been identified, we still have not observed its experimental violation.Evidence for CLF violation (CLFV) would hence mean existence of physics Beyond the SM (BSM) and is of high interest. The recently approved Electron-Ion Collider (EIC) at BNL with 100-1000 times higher high luminosity than HERA (at DESY, German) will provide a unique new opportunity for such a search. In contrast with the CLFV transition between the $e$ and $\mu$ for which very stringent limits exist, there is still relatively large discovery space for the CLFV transition between the $e$ and $\tau$ within EIC’s reach. With the modern detector designed for the EIC, $\tau$s created in e-p scattering at the EIC are expected to be identified with high efficiency. In this talk, we will present results from an ongoing study of sensitivity possible for $e \rightarrow \tau$ conversion in e-p scattering at the EIC. [Preview Abstract] |
Saturday, October 31, 2020 2:36PM - 2:48PM |
MQ.00004: Studies of Open Charm and Bottom Hadron Reconstruction at the Electron-Ion Collider Matthew Kelsey The heavy-flavor program for the future Electron-Ion Collider (EIC) at Brookhaven National Laboratory offers many potential measurement opportunities probing the nucleon structure and cold nuclear medium effects with electron-proton(ion) collisions. Among many other interesting topics, a particular expected achievement is the improvement to the gluon nuclear parton distribution function from the measurement of the charm structure functions. In this presentation, we will present the studies of open heavy-flavor hadrons in a wide kinematic region using simulated electron-proton collisions in PYTHIA with detector performance based on a silicon-based tracker for the future EIC detector. We study the reconstruction of open charm and bottom hadrons, and the effects of using secondary vertex reconstruction to suppress backgrounds including the impacts of primary vertex resolution. The impact of the expected statistical precision on various physics observables with the nominal projected integrated luminosity will be discussed. [Preview Abstract] |
Saturday, October 31, 2020 2:48PM - 3:00PM |
MQ.00005: $\Lambda_c$ baryon production at future EIC Yuanjing Ji In high energy collisions, heavy quarks (c, b) are predominately produced in the initial hard scattering process. The relative ratio of different heavy flavor hadrons species serves as a tool to study charm quark hadronization mechanism. A large $\Lambda_c^+/D^0$ ratio is observed in both p+p and A+A collisions at $p_T<10$ GeV at LHC and RHIC. The high statistics charm baryon production in e+p and e+A collisions in the future Electron-Ion Collider (EIC) at Brookhaven National Laboratory shed light on the hadronization mechanism in the cold nuclear medium. In this talk, the measurement of $\Lambda_c^+/D^0$ ratio in e+p and e+A collisions in the future EIC will be studied. $\Lambda_c^+/D^0$ ratio as a function of multiplicity, transverse momentum, and $Q^2$ in different systems will be presented. We will also discuss the potential of $\Lambda_c^+$ production measurements in the future EIC collider. The physics projections will be shown based on estimated EIC detector performance. [Preview Abstract] |
Saturday, October 31, 2020 3:00PM - 3:12PM |
MQ.00006: Developing the high-performance DIRC detector for the future Electron-Ion Collider Greg Kalicy, Nilanga Wickramaarachchi The next frontier project of nuclear physics in the United States will be the Electron-Ion Collider (EIC), planned to be built in the Brookhaven National Laboratory (BNL). Excellent particle identification (PID) is one of the key requirement for the EIC central detector. Identification of the hadrons in the final state is critical to study how different quark flavors contribute to nucleon properties. A detector using the Detection of Internally Reflected Cherenkov light (DIRC) principle, with a radial size of only 7-8 cm, is a very attractive solution for those requirements. The R$\&$D program performed by the EIC PID collaboration (eRD14) is focused on designing a high-performance DIRC (hpDIRC) detector that would extend the momentum coverage well beyond the state-of-the-art 3 standard deviations or more separation of $\pi/K$ up to 6 GeV/$c$, $p/K$ up to 10 GeV/$c$, and low energy $e/\pi$. Key components of the hpDIRC detector are a 3-layer compound lens and small pixel-size photo-sensors. This contribution will present major developments in the DIRC R&D program, with a focus on developing and validating the radiation hard 3-layer lens, and preparing the hpDIRC prototype for a beam test at Fermilab. [Preview Abstract] |
Saturday, October 31, 2020 3:12PM - 3:24PM |
MQ.00007: R&D towards a compact all-silicon tracker for the future Electron-Ion Collider Ernst Sichtermann The future U.S.-based Electron-Ion Collider will offer unique opportunities to peer deeply into protons, neutrons, and nuclei owing to its capabilities to collide high-energy polarized ectron and ion beams at high luminosity and to observe the collisions with advanced detectors. I will discuss a design path towards a compact, low-material, large acceptance, and high-performance tracking and vertexing detector subsystem for charged particles based on monolithic active pixel sensor technology and associated R\&D. [Preview Abstract] |
Saturday, October 31, 2020 3:24PM - 3:36PM |
MQ.00008: Forward Silicon Tracker Design and R&D for the Future Electron-Ion Collider Cheuk-Ping Wong The future Electron-Ion Collider (EIC) will utilize high luminosity high energy electron and nucleus collisions to solve several fundamental questions in the nuclear physics field. To study hadronization processes inside and outside a nucleon, heavy flavor and jet are the key measurement at the EIC. Furthermore, these heavy flavor and jet products measured in the nucleus beam going direction can precisely measure the nuclear parton distribution in the poor constrained kinematic region. A forward silicon tracker (FST) integrated with the central silicon vertex detector and other EIC detector subsystems will be critical to realize these forward heavy flavor and jet measurements. The FST with a 1 to 4 pseudorapidity coverage, is proposed to measure trajectories of charged particles to reconstruct or tag heavy flavor particles through the displaced vertex method. With fine spatial and fast time resolutions of the proposed silicon sensor candidates, the preliminary FST design in simulation can cleanly identify heavy flavor particles with a good signal over background ratio. This presentation will summarize the working in progress details about the FST detector design, simulation studies of its tracking performance, silicon sensor options and the future plan. [Preview Abstract] |
Saturday, October 31, 2020 3:36PM - 3:48PM |
MQ.00009: Hadron Polarimetry for the EIC Ana S. Nunes The Electron-Ion Collider will be the first collider to use both polarized electron beams and polarized protons and light ions. This will offer unique opportunities to study the structure of protons and nuclei and answer fundamental questions in QCD. The uncertainties on the polarization measurement translate directly into the uncertainties of final physics observables. Hence, a precise measurement of the hadron beam polarization and a good control of the uncertainties are critical for the success of the spin program at the EIC. Contrary to the case of electron beam polarimetry, which uses physical processes derived from first principles that allow a high precision extraction of the electron beam polarization, for hadron beams no such process is available, and the currently best used methods rely on the process of elastic scattering in the Coulomb-Nuclear Interference (CNI) region, of which there are only effective models available. The experience from RHIC, the only polarized proton collider, will be detailed and the challenges of the measurements at the EIC will be addressed. In particular, measurements of the present RHIC polarimeters and simulations of the future EIC polarimeters will be presented. [Preview Abstract] |
Saturday, October 31, 2020 3:48PM - 4:00PM |
MQ.00010: Polarized 3He$++$ Source Development For Future Electron Ion Collider At BNL Anatoli Zelenski The nuclear polarization in polarized 3He nuclei is mostly carried by neutrons. The 3He$++$ beam polarization produced in the source can be preserved during acceleration in high-energy synchrotron accelerators like AGS and RHIC by using the ``Siberian snake'' technique. In effect, in electron-3He nuclei collisions at EIC we can study the fundamental interactions of polarized electron beam with high-energy polarized neutron beam, complimentary to the studies of the polarized electrons with polarized proton beam collisions. We proposed a new polarization technique for production of high intensity 3He$++$ ion beam, which is based on ionization of 3He gas (polarized by metastability exchange technique) in the Electron Beam Ion Source (EBIS). The development of the source for EIC is now in progress in collaboration between BNL and MIT. In this paper we will present the recent progress in studies of limitation on the maximum attainable nuclear polarization in the metastability exchange technique in high 5.0T EBIS magnetic field and depolarization effects during polarized 3He gas injection to the EBIS and multi-step ionization processes. [Preview Abstract] |
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