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Dark matter direct detection from the single phonon to the nuclear recoil regime
/ Campbell-Deem, Brian (UC, San Diego) ; Knapen, Simon (LBL, Berkeley ; UC, Berkeley ; CERN) ; Lin, Tongyan (UC, San Diego) ; Villarama, Ethan (UC, San Diego)
In most direct detection experiments, the free nuclear recoil description of dark matter scattering breaks down for masses $\lesssim$ 100 MeV, or when the recoil energy is comparable to a few times the typical phonon energy. For dark matter lighter than 1 MeV, scattering via excitation of a single phonon dominates and has been computed previously, but for the intermediate mass range or higher detector thresholds, multiphonon processes dominate. [...]
arXiv:2205.02250.-
2022-08-01 - 28 p.
- Published in : Phys. Rev. D 106 (2022) 036019
Fulltext: 2205.02250 - PDF; PhysRevD.106.036019 - PDF;
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Directional Detection of Light Dark Matter with Polar Materials
/ Griffin, Sinead (UC, Berkeley ; LBL, Berkeley) ; Knapen, Simon (UC, Berkeley ; LBL, Berkeley) ; Lin, Tongyan (UC, Berkeley ; LBL, Berkeley ; UC, San Diego) ; Zurek, Kathryn M. (UC, Berkeley ; LBL, Berkeley ; CERN)
We consider the direct detection of dark matter (DM) with polar materials, where single production of optical or acoustic phonons gives excellent reach to scattering of sub-MeV DM for both scalar and vector mediators. Using Density Functional Theory (DFT), we calculate the material-specific matrix elements, focusing on GaAs and sapphire, and show that DM scattering in an anisotropic crystal such as sapphire features a strong directional dependence. [...]
arXiv:1807.10291.-
2018-12-28 - 27 p.
- Published in : Phys. Rev. D 98 (2018) 115034
Article from SCOAP3: PDF; Fulltext: PDF;
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Sigma Models with Negative Curvature
/ Alonso, Rodrigo (UC, San Diego) ; Jenkins, Elizabeth E. (CERN ; UC, San Diego) ; Manohar, Aneesh V. (CERN ; UC, San Diego)
We construct Higgs Effective Field Theory (HEFT) based on the scalar manifold H^n, which is a hyperbolic space of constant negative curvature. The Lagrangian has a non-compact O(n,1) global symmetry group, but it gives a unitary theory as long as only a compact subgroup of the global symmetry is gauged. [...]
arXiv:1602.00706; CERN-TH-2016-024.-
Geneva : CERN, 2016 - 8 p.
- Published in : Phys. Lett. B 756 (2016) 358-364
Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint
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Particle Graph Autoencoders and Differentiable, Learned Energy Mover's Distance
/ Tsan, Steven (UC, San Diego) ; Kansal, Raghav (UC, San Diego) ; Aportela, Anthony (UC, San Diego) ; Diaz, Daniel (UC, San Diego) ; Duarte, Javier (UC, San Diego) ; Krishna, Sukanya (UC, San Diego) ; Mokhtar, Farouk (UC, San Diego) ; Vlimant, Jean-Roch (Caltech) ; Pierini, Maurizio (CERN)
Autoencoders have useful applications in high energy physics in anomaly detection, particularly for jets - collimated showers of particles produced in collisions such as those at the CERN Large Hadron Collider. [...]
arXiv:2111.12849.
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9 p.
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Anomaly Cancellation in Effective Field Theories From the Covariant Derivative Expansion
/ Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Lu, Xiaochuan (Oregon U. ; UC, San Diego) ; Zhang, Zhengkang (UC, Santa Barbara)
We extend our recently-proposed formalism for calculating anomalies of global and gauge symmetries using the Covariant Derivative Expansion to include a general class of operators that can appear in relativistic Effective Field Theories (EFTs). This allows us to prove that EFT operators involving general scalar, vector, and tensor couplings to fermion bilinears only give rise to irrelevant anomalies, which can be removed by an appropriate choice of counterterms, thereby confirming the absence of new constraints from anomaly cancellation on the Standard Model EFT..
arXiv:2301.00827; CERN-TH-2023-002.-
2023-09-01 - 21 p.
- Published in : Phys. Rev. D 108 (2023) 056027
Fulltext: PDF;
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