Thu·Oct 17, 2019Thursday·October 17, 2019

1. 01*

   Identical pion intensity interferometry at sqrt(s_{NN})=2.4 GeV

   J. Adamczewski-Musch🇩🇪 · O. Arnold🇩🇪 · C. Behnke🇩🇪 · A. Belounnas🇫🇷 · A. Belyaev🇷🇺 · J.C. Berger-Chen🇩🇪 · J. Biernat🇵🇱 · A. Blanco🇵🇹 · C. Blume🇩🇪 · M. Böhmer🇩🇪 · P. Bordalo🇵🇹 · S. Chernenko🇷🇺 and 107 other authors

   High-statistics ${\pi }^{-}{\pi }^{-}$ and ${\pi }^{+}{\pi }^{+}$ femtoscopy data are presented for Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=2.4$ GeV, measured with HADES at SIS18/GSI. The experimental correlation functions allow the determination of the space-time extent of the corresponding emission sources via a comparison to models. The emission source, parametrized as three-dimensional Gaussian distribution, is studied in dependence on pair transverse momentum, azimuthal emission angle with respect to the reaction plane, collision centrality and beam energy. For all centralities and transverse momenta, a geometrical distribution of ellipsoidal shape is found in the plane perpendicular to the beam direction with the larger extension perpendicular to the reaction plane. For large transverse momenta, the corresponding eccentricity approaches the initial eccentricity. The eccentricity is smallest for most central collisions, where the shape is almost circular. The magnitude of the tilt angle of the emission ellipsoid in the reaction plane decreases with increasing centrality and increasing transverse momentum. All source radii increase with centrality, largely exhibiting a linear rise with the number of participants, irrespective of transverse momentum. A substantial charge-sign difference of the source radii is found, appearing most pronounced at low transverse momentum. The extracted source parameters are consistent with the extrapolation of their energy dependence down from higher energies.

   nucl-exEPJA(2020)·32 citations
2. 02*

   Electron Transport in Gaseous Detectors with a Python-based Monte Carlo Simulation Code

   B. Al Atoum🇺🇸 · S. F. Biagi🇬🇧 · D. Gonzalez-Diaz🇪🇸 · B. J. P Jones🇺🇸 · A. D. McDonald🇺🇸

   Understanding electron drift and diffusion in gases and gas mixtures is a topic of central importance for the development of modern particle detection instrumentation. The industry-standard MagBoltz code has become an invaluable tool during its 20 years of development, providing capability to solve for electron transport (`swarm') properties based on a growing encyclopedia of built-in collision cross sections. We have made a refactorization of this code from FORTRAN into Cython, and studied a range of gas mixtures of interest in high energy and nuclear physics. The results from the new open source PyBoltz package match the outputs from the original MagBoltz code, with comparable simulation speed. An extension to the capabilities of the original code is demonstrated, in implementation of a new Modified Effective Range Theory interface. We hope that the versatility afforded by the new Python code-base will encourage continued use and development of the MagBoltz tools by the particle physics community.

   ↳ physics.ins-dethep-exnucl-exComput.Phys.Commun.(2020)·28 citations
3. 03*

   Proceedings of The Magnificent CE$\nu$NS Workshop 2018

   D. Aristizabal Sierra🇨🇱 · A.B. Balantekin🇺🇸 · D. Caratelli🇺🇸 · B. Cogswell🇬🇧 · J.I. Collar🇺🇸 · C.E. Dahl🇺🇸 · J. Dent🇺🇸 · B. Dutta🇺🇸 · J. Engel🇺🇸 · J. Estrada🇺🇸 · J. Formaggio🇺🇸 · S. Gariazzo🇪🇸 and 33 other authors

   The Magnificent CE$\nu$NS Workshop (2018) was held November 2 & 3 of 2018 on the University of Chicago campus and brought together theorists, phenomenologists, and experimentalists working in numerous areas but sharing a common interest in the process of coherent elastic neutrino-nucleus scattering (CE$\nu$NS). This is a collection of abstract-like summaries of the talks given at the meeting, including links to the slides presented. This document and the slides from the meeting provide an overview of the field and a snapshot of the robust CE$\nu$NS-related efforts both planned and underway.

   ↳ hep-exastro-ph.IMhep-phnucl-ex+18 citations
4. 04*

   Nano-tracking detector for neutrinoless double beta decay characterization

   Ethan Brown🇺🇸 · Kelly Odgers🇺🇸 · Adam Tidball🇺🇸

   Of the many extensions to the standard model that could possibly generate neutrino mass, most necessitate the neutrino being a Majorana fermion. If this is the case, the rare process of neutrinoless double beta decay is predicted with half lives greater than about $10^{25}$ years. Many current and future experiments look for this decay by identifying a summed double beta energy at the Q value of the decay, but adding energy and angular measurements of the individual betas allows the underlying decay mechanism to be probed. A novel nano-tracking detector based on a clever combination of thin film CdTe devices will be presented here. This tracker will have order 100 nm spatial resolution in one dimension while measuring the energy deposition across the track length of electron recoils in the detector. This allows energy and angular correlation measurements of a potential neutrinoless double beta decay signal, as well as a unique background suppression capability. Deep learning algorithms will be used to reconstruct the electron paths, the double beta signals and perform the correlation analyses, and will simultaneously allow clear distinction between double betas and single beta or gamma-induced electronic recoils. The detector concept will be presented, along with preliminary studies, to demonstrate its operation and the physics reach for neutrinoless double beta decay. By exploiting recoil discrimination, an array of these detectors can potentially probe beyond the inverted hierarchy to either follow the next generation of neutrinoless double beta decay experiments or to serve as a post-discovery characterization experiment.

   ↳ physics.ins-dethep-exnucl-ex1 citation

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.