Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session CCC01: V: Dark Matter |
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Sponsoring Units: DPF Chair: Kelly Stifter, Fermilab Room: Virtual Room 1 |
Wednesday, April 26, 2023 3:30PM - 3:42PM |
CCC01.00001: ADMX: Run 1c HiRes Analysis Alexander T Hipp The Axion Dark Matter eXperiment (ADMX) aims to detect axions within the galactic halo from their conversion to microwave photons inside a resonant cavity permeated by a strong magnetic field. Run 1c is the most recent data run, covering approximately 0.8--1 Ghz. ADMX has two primary analysis channels: Medium and High Resolution (HiRes), with frequency resolutions of 200 Hz and 20 mHz, respectively. The HiRes channel is sensitive to flows of non-virialized axions that may exist within the Milky Way halo. These flows are expected to have very low velocity dispersion, leading to correspondingly narrow peaks in the measured power spectra. Further, they may also contribute significantly to the local density of dark matter. A search for such flows in the Run 1c data has been performed at spectral resolutions of 20, 40, and 1000 mHz. These allow us to probe a broader range of galactic halo models and their structure. This talk will cover the motivation for HiRes, the analysis process, results for the run 1c dataset, and future work. |
Wednesday, April 26, 2023 3:42PM - 3:54PM |
CCC01.00002: ADMX Extended Frequency Range (EFR): Searching for 2-4GHz axions with 18 cavities Stefan P Knirck ADMX (Axion Dark Matter eXperiment) is the world-leading search for QCD axion dark matter in the μeV mass range. ADMX detects axions via their conversion to photons under a strong magnetic field in a high-Q resonant cavity. ADMX-EFR is designed to use an array of 18 cavities and coherent power combining to cover a range from 2-4GHz (8-16μeV axion mass) with DFSZ benchmark sensitivity in a 3 year operation using a designated 9.4T MRI magnet at Fermilab. In this talk we outline the conceptual design of EFR based on experience and R&D from previous ADMX runs and present a detailed sensitivity estimate for EFR. |
Wednesday, April 26, 2023 3:54PM - 4:06PM |
CCC01.00003: Cherenkov Light Identification to Improve Axion Searches on the Coherent CAPTAIN-Mills Experiment Darcy A Newmark The CCM experiment is a 10 ton liquid argon scintillation detector located at Los Alamos National Lab. The detector is located 23m downstream from the Lujan Facility’s stopped pion source which will receive 2.25 x 1022 POT in the ongoing 3 year run cycle. Instrumented with 200 8-inch PMTs and 40 optically isolated 1-inch veto PMTs, CCM can resolve signals across a wide energy spectrum. CCM has sensitivity to nuclear recoil events around 10s of keV to electromagnetic signals in the 100s of MeV region. While the engineering run in 2019 set world leading limits on leptophobic dark matter searches using scintillation light, upcoming analyses are incorporating Cherenkov ring reconstruction to reduce sources of backgrounds in axion searches. Using data from the upcoming run cycle and Cherenkov light identification, CCM has sensitivity to probe the cosmological triangle region as well as QCD axion bands. |
Wednesday, April 26, 2023 4:06PM - 4:18PM |
CCC01.00004: Leptophobic dark photon interpretation of the $eta^{left(prime ight)} ightarrowpi^0left(eta ight)gammagamma$ puzzle Yaroslav Balytskyi The decays of $eta$ and $eta^prime$ mesons provide unique opportunities for testing the properties of low energy Quantum Chromodynamics and for the search of new physics beyond the Standard Model. However, recent experimental results on the rare decays of $eta^{left(prime ight)} ightarrowpi^0left(eta ight)gammagamma$ cannot be self-consistently described by the combination of the Vector Meson Dominance and Linear Sigma Model employing the same set of parameters. We show that this tension can be attributed to the presence of a leptophobic dark photon $mathcal{B}$, and find representative values of the parameters which provide consistent description of these three decays, simultaneously. Unlike existing strategies of Dalitz analysis searching for the bump at $m_mathcal{B}$, we propose the usage of mismatch between these decays to constrain the parameters of the hypothetical dark photon. Additionally, we discuss possible signatures of sub-{ m GeV} $mathcal{B}$ boson in heavy meson decays. |
Wednesday, April 26, 2023 4:18PM - 4:30PM |
CCC01.00005: Design and development of high-frequency resonant structures for future axion searches James Sinnis, Raphael Cervantes The axion is a bosonic dark matter candidate which can be detected by its conversion to photons in a magnetic field. In this talk I will give an overview of two projects that aim to test high frequency, tunable resonator designs for use in axion haloscopes. The first experiment is named Orpheus, and the second is yet unnamed and is located at Stanford. The current generation of tunable axion searches range from about 1-6 GHz (axion masses of about 1-25 $mu$eV). However, these experiments lose sensitivity when probing higher axion masses, largely due to the design of the resonators used. As the current searches continue, novel resonator designs will need to be developed to search at these higher frequencies. |
Wednesday, April 26, 2023 4:30PM - 4:42PM Withdrawn |
CCC01.00006: Search for dark mesons decaying to top and bottom quarks with the ATLAS detector Stephanie A Majewski, Jochen J Heinrich The Standard Model can be extended by a new strongly-coupled, SU(2) dark flavour symmetry conserving model that gives rise to a familiar-looking dark sector as direct analogue to the QCD meson and baryon sector. Dark matter could thus manifest itself as composite dark mesons free of constraints from precision Higgs coupling or electroweak measurements. We present the first dedicated search at any collider experiment for such dark mesons decaying promptly and gaugephobically to pure Standard Model final states. In this case dark mesons are always pair produced, predominantly decay to top and bottom quarks resulting in either tttb or ttbb final states and are searched for in the all-hadronic channel. The dominant background originates from QCD multijets and is estimated by a sophisticated 4-dimensional extrapolation technique that takes undesired correlations between discriminating variables into account. All remaining backgrounds are estimated from Monte Carlo simulation. The presence of a signal is evaluated by performing a binned likelihood fit simultaneously in all search regions. The analysis relies on the full Run 2 proton–proton collision dataset at √s = 13 TeV collected with the ATLAS detector at the CERN Large Hadron Collider. |
Wednesday, April 26, 2023 4:42PM - 4:54PM |
CCC01.00007: Constraining Particle Dark Matter with eROSITA Early Data Chingam Fong, Kenny C. Y. Ng, Qishan Liu Many well motivated dark matter (DM) particle candidates can decay into detectable X-ray photons. We analyze eROSITA Final Equatorial Depth Survey (eFEDS) from eROSITA early release data to search for unexplained X-ray lines that could indicate DM signal. Having discovered no extra line, we set limits on DM decay rate in mass range between 2 - 18 keV, and constrain the parameter space of 3 DM particles: sterile neutrino, Axionlike particles, and dark photon. Finally we also study the projected sensitivity of eROSITA full sky search, showing that eROSITA is expected to set stringent limits in the soft X-ray band. |
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