Wed·Mar 25, 2020Wednesday·March 25, 2020

1. 01*

   First Measurement of Coherent Elastic Neutrino-Nucleus Scattering on Argon

   COHERENT Collaboration: D. Akimov · J.B. Albert · P. An · C. Awe · P.S. Barbeau · B. Becker · V. Belov · M.A. Blackston · L. Blokland · A. Bolozdynya · B. Cabrera-Palmer · N. Chen and 70 other authors

   We report the first measurement of coherent elastic neutrino-nucleus scattering (\cevns) on argon using a liquid argon detector at the Oak Ridge National Laboratory Spallation Neutron Source. Two independent analyses prefer \cevns over the background-only null hypothesis with greater than $3\sigma$ significance. The measured cross section, averaged over the incident neutrino flux, is (2.2 $\pm$ 0.7) $\times$10${}^{-39}$ cm${}^2$ -- consistent with the standard model prediction. The neutron-number dependence of this result, together with that from our previous measurement on CsI, confirms the existence of the \cevns process and provides improved constraints on non-standard neutrino interactions.

   nucl-exhep-exPRL(2021)·446 citations
2. 02*

   Search for Neutrino-less Double Beta Decay of ${}^{64}$Zn and ${}^{70}$Zn with CUPID-0

   O. Azzolini🇮🇹 · J. W. Beeman🇺🇸 · F. Bellini🇮🇹 · M. Beretta🇮🇹 · M. Biassoni🇮🇹 · C. Brofferio🇮🇹 · C. Bucci🇮🇹 · S. Capelli🇮🇹 · L. Cardani🇮🇹 · E. Celi🇮🇹 · P. Carniti🇮🇹 · N. Casali🇮🇹 and 34 other authors

   CUPID-0 is the first pilot experiment of CUPID, a next-generation project searching for neutrino-less double beta decay. In its first scientific run, CUPID-0 operated 26 ZnSe cryogenic calorimeters coupled to light detectors in the underground Laboratori Nazionali del Gran Sasso. In this work, we analyzed a ZnSe exposure of 11.34 kg$\times$yr to search for the neutrino-less double beta decay of ${}^{70}$Zn and for the neutrino-less positron-emitting electron capture of ${}^{64}$Zn. We found no evidence for these decays and set 90$\%$ credible interval limits of ${\mathrm{T}}_{1/2}^{0\nu \beta \beta }{(}^{70}\mathrm{Zn})>1.6\times 10^{21}$ yr and ${\mathrm{T}}_{1/2}^{0\nu EC\beta +}{(}^{64}\mathrm{Zn})>1.2\times 10^{22}$ yr, surpassing by almost two orders of magnitude the previous experimental results

   nucl-exphysics.ins-detEPJC(2020)·21 citations
3. 03*

   Classifying Pole of Amplitude Using Deep Neural Network

   Denny Lane B. Sombillo🇵🇭 · Yoichi Ikeda🇯🇵 · Toru Sato🇯🇵 · Atsushi Hosaka🇯🇵

   Most of exotic resonances observed in the past decade appear as peak structure near some threshold. These near-threshold phenomena can be interpreted as genuine resonant states or enhanced threshold cusps. Apparently, there is no straightforward way of distinguishing the two structures. In this work, we employ the strength of deep feed-forward neural network in classifying objects with almost similar features. We construct a neural network model with scattering amplitude as input and nature of pole causing the enhancement as output. The training data is generated by an S-matrix satisfying the unitarity and analyticity requirements. Using the separable potential model, we generate a validation data set to measure the network's predictive power. We find that our trained neural network model gives high accuracy when the cut-off parameter of the validation data is within $400$-$800\text{mbox}MeV$. As a final test, we use the Nijmegen partial wave and potential models for nucleon-nucleon scattering and show that the network gives the correct nature of pole.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2020)·29 citations
4. 04*

   QCD Challenges from pp to A-A Collisions

   J. Adolfsson🇸🇪 · A. Andronic🇩🇪 · C. Bierlich🇸🇪 · P. Bozek🇵🇱 · S. Chakraborty🇸🇪 · P. Christiansen🇸🇪 · D. D. Chinellato🇧🇷 · R. J. Fries🇺🇸 · G. Gustafson🇸🇪 · H. van Hees🇩🇪 · P. M. Jacobs🇺🇸 · D. J. Kim🇫🇮 and 28 other authors

   This paper is a write-up of the ideas that were presented, developed and discussed at the third International Workshop on QCD Challenges from pp to A-A, which took place in August 2019 in Lund, Sweden. The goal of the workshop was to focus on some of the open questions in the field and try to come up with concrete suggestions for how to make progress on both the experimental and theoretical sides. The paper gives a brief introduction to each topic and then summarizes the primary results.

   ↳ hep-phhep-exnucl-exnucl-thEPJA(2020)·38 citations

* 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.