Thu·Apr 26, 2018Thursday·April 26, 2018

1. 01*

   COHERENT Collaboration data release from the first observation of coherent elastic neutrino-nucleus scattering

   COHERENT Collaboration: D. Akimov🇷🇺 · J.B. Albert🇺🇸 · P. An🇺🇸 · C. Awe🇺🇸 · P.S. Barbeau🇺🇸 · B. Becker🇺🇸 · V. Belov🇷🇺 · M.A. Blackston🇺🇸 · A. Bolozdynya🇷🇺 · A. Brown🇺🇸 · A. Burenkov🇷🇺 · B. Cabrera-Palmer🇺🇸 and 81 other authors

   This release includes data and information necessary to perform independent analyses of the COHERENT result presented in Akimov et al., arXiv:1708.01294 [nucl-ex]. Data is shared in a binned, text-based format, including both "signal" and "background" regions, so that counts and associated uncertainties can be quantitatively calculated for the purpose of separate analyses. This document describes the included information and its format, offering some guidance on use of the data. Accompanying code examples show basic interaction with the data using Python.

   nucl-exhep-ex117 citations
2. 02*

   Hidden-strange molecular states and the $N\varphi$ bound state via a QCD van der Waals force

   Jun He🇨🇳 · Hongxia Huang🇨🇳 · Dian-Yong Chen🇨🇳 · Xinmei Zhu🇨🇳

   In this work, we study the hidden-strange molecular states composed of a baryon and a vector meson in a coupled-channel $N\rho -N\omega -N\varphi -\Lambda K^{\ast }-\Sigma K^{\ast }$ interaction. With the help of the effective Lagrangians which coupling constants are determined by the SU(3) symmetry, the interaction is constructed and inserted into the quasipotential Bethe-Salpeter equation to search for poles in the complex plane, which correspond to molecular states. Two poles are found with a spin parity $3/2^{-}$ near the $N\rho$ and the $\Sigma K^{\ast }$ thresholds, which can be related to the $N(1700)$ and the $N(2100)$, respectively. No pole near the $N\varphi$ threshold can be found if direct interaction between a nucleon and $\varphi$ meson is neglected according to the OZI rule. After introducing the QCD van der Waals force between a nucleon and $\varphi$ meson, a narrow state can be produced near the $N\varphi$ threshold. Inclusion of the QCD van der Waals force changes the line shape of the invariant mass spectrum in the $N\varphi$ channel leading to a worse agreement with the present low-precision data. Future experiments at BelleII, JLab, and other facilities will be very helpful to clarify the existence of these possible hidden-strange molecular states.

   ↳ hep-phnucl-exnucl-thPRD(2018)·15 citations
3. 03*

   Sensitivity of Neutrino-Nucleus Interaction Measurements to 2p2h Excitations

   Stephen Dolan🇫🇷 · Ulrich Mosel🇩🇪 · Kai Gallmeister🇩🇪 · Luke Pickering🇺🇸 · Sara Bolognesi🇫🇷

   We calculate the charged-current cross sections obtained at the T2K off-axis near detector for ${\nu }_{\mu }$-induced events without pions and any number of protons in the final state using transport theory as encoded in the GiBUU model. In a comparison with recent T2K data the strength of the 2p2h multinucleon correlations is determined. Linking this to the isospin (T) of the initial nuclear state, it is found that T=0 leads to a significantly better fit of the recent cross sections obtained by T2K, thus achieving consistency of the 2p2h multi-nucleon correlation contributions between electron-nucleus and neutrino-nucleus reactions.

   ↳ hep-exhep-phnucl-exnucl-thPRC(2018)·36 citations
4. 04*

   Deep Neural Networks for Energy and Position Reconstruction in EXO-200

   S. Delaquis🇺🇸 · M.J. Jewell🇺🇸 · I. Ostrovskiy🇺🇸 · M. Weber🇺🇸 · T. Ziegler🇩🇪 · J. Dalmasson🇺🇸 · L.J. Kaufman🇺🇸 · T. Richards🇺🇸 · J.B. Albert🇺🇸 · G. Anton🇩🇪 · I. Badhrees🇨🇦 · P.S. Barbeau🇺🇸 and 82 other authors

   We apply deep neural networks (DNN) to data from the EXO-200 experiment. In the studied cases, the DNN is able to reconstruct the relevant parameters - total energy and position - directly from raw digitized waveforms, with minimal exceptions. For the first time, the developed algorithms are evaluated on real detector calibration data. The accuracy of reconstruction either reaches or exceeds what was achieved by the conventional approaches developed by EXO-200 over the course of the experiment. Most existing DNN approaches to event reconstruction and classification in particle physics are trained on Monte Carlo simulated events. Such algorithms are inherently limited by the accuracy of the simulation. We describe a unique approach that, in an experiment such as EXO-200, allows to successfully perform certain reconstruction and analysis tasks by training the network on waveforms from experimental data, either reducing or eliminating the reliance on the Monte Carlo.

   ↳ physics.ins-dethep-exnucl-exJINST(2018)·52 citations
5. 05*

   Current unknowns in the three neutrino framework

   F. Capozzi🇩🇪 · E. Lisi🇮🇹 · A. Marrone🇮🇹 · A. Palazzo🇮🇹

   We present an up-to-date global analysis of data coming from neutrino oscillation and non-oscillation experiments, as available in April 2018, within the standard framework including three massive and mixed neutrinos. We discuss in detail the status of the three-neutrino (3nu) mass-mixing parameters, both known and unknown. Concerning the latter, we find that: normal ordering (NO) is favored over inverted ordering (IO) at 3sigma level; the Dirac CP phase is constrained within ~15% (~9%) uncertainty in NO (IO) around nearly-maximal CP-violating values; the octant of the largest mixing angle and the absolute neutrino masses remain undetermined. We briefly comment on other unknowns related to theoretical and experimental uncertainties (within 3nu) or possible new states and interactions (beyond 3nu).

   ↳ hep-phastro-ph.COhep-exnucl-exPPNP(2018)·296 citations
6. 06*

   {\mu}Dose: a compact system for environmental radioactivity and dose rate measurement

   Konrad Tudyka · Sebastian Miłosz · Grzegorz Adamiec · Andrzej Bluszcz · Grzegorz Poręba · Łukasz Paszkowski · Aleksander Kolarczyk

   $\mu$Dose is a novel compact analytical instrument for assessing low level ${}^{238}$U, ${}^{235}$U, ${}^{232}$Th decay chains and ${}^{40}$K radioactivity. The system is equipped with a dual $\alpha$/$\beta$ scintillator allowing to discriminate between $\alpha$ and $\beta$ particles. The unique build-in pulse analyzer measures the amplitude of each individual pulse, its shape and the time interval between subsequent pulses. This allows the detection of pulse pairs arising from subsequent decays of ${}^{214}$Bi/${}^{214}$Po, ${}^{220}$Rn/${}^{216}$Po, ${}^{212}$Bi/${}^{212}$Po and ${}^{219}$Rn/${}^{215}$Po. The obtained $\alpha$ and $\beta$ counts and four separate decay pair counts are used to asses the ${}^{238}$U, ${}^{235}$U, ${}^{232}$Th and ${}^{40}$K specific radioactivities in the measured samples through the use of radioactivity standards. The $\mu$Dose system may be equipped with various photomultipliers and counting containers to assess radionuclide concentrations of samples of masses ranging between 0.4~g and 4~g. As a result, the user can customize the system to their needs and maximize the instrument\textquotesingle s performance. The system is controlled by a dedicated software with a graphical user interface and modules for system calibration, data visualization, specific radioactivity calculations and dose rate determination using the infinite matrix assumption.

   ↳ physics.ins-detnucl-exRadiat.Meas.(2018)·1 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.