Thu·Jan 20, 2022Thursday·January 20, 2022

1. 01*

   A Search for Electron Neutrino Transitions to Sterile States in the BEST Experiment

   V.V. Barinov🇷🇺 · B.T. Cleveland🇨🇦 · S.N. Danshin🇷🇺 · H. Ejiri🇯🇵 · S.R. Elliott🇺🇸 · D. Frekers🇩🇪 · V.N. Gavrin🇷🇺 · V.V. Gorbachev🇷🇺 · D.S. Gorbunov🇷🇺 · W.C. Haxton🇺🇸 · T.V. Ibragimova🇷🇺 · I. Kim🇺🇸 and 18 other authors

   The Baksan Experiment on Sterile Transitions (BEST) probes the gallium anomaly and its possible connections to oscillations between active and sterile neutrinos. Based on the Gallium-Germanium Neutrino Telescope (GGNT) technology of the SAGE experiment, BEST employs two zones of liquid Ga target to explore neutrino oscillations on the meter scale. Oscillations on this short scale could produce deficits in the ${}^{71}$Ge production rates within the two zones, as well as a possible rate difference between the zones. From July 5th to October 13th 2019, the two-zone target was exposed to a primarily monoenergetic, 3.4-MCi ${}^{51}$Cr neutrino source 10 times for a total of 20 independent ${}^{71}$Ge extractions from the two Ga targets. The ${}^{71}$Ge production rates from the neutrino source were measured from July 2019 to March 2020. At the end of these measurements, the counters were filled with ${}^{71}$Ge doped gas and calibrated during November 2020. In this paper, results from the BEST sterile neutrino oscillation experiment are presented in details. The ratio of the measured ${}^{71}$Ge production rates to the predicted rates for the inner and the outer target volumes are calculated from the known neutrino capture cross section. Comparable deficits in the measured ratios relative to predicted values are found for both zones, with the $4\sigma$ deviations from unity consistent with the previously reported gallium anomaly. If interpreted in the context of neutrino oscillations, the deficits give best fit oscillation parameters of $\Delta m^2=3.3_{-2.3}^{+\infty }$ eV${}^2$ and sin${}^{2}2\theta =0.42_{-0.17}^{+0.15}$, consistent with ${\nu }_e\to {\nu }_s$ oscillations governed by a surprisingly large mixing angle.

   nucl-exhep-exPRC(2022)·160 citations
2. 02*

   Backscattering of MeV Electrons. An Analysis of Tabata's Experiment with Geant4

   Sylvian Kahane

   A series of simulations were conducted with Geant4 in order to verify the electron backscattering experiments performed by Tabata in the low Z elements of Be, C, and Al. In general, quite good agreement was obtained by carefully choosing the physics lists employed. These results invalidate the claim made before about the presence of experimental errors in the above work.

   nucl-ex0 citations
3. 03*

   Analyzing N-point Energy Correlators Inside Jets with CMS Open Data

   Patrick T. Komiske🇺🇸 · Ian Moult🇺🇸 · Jesse Thaler🇺🇸 · Hua Xing Zhu🇨🇳

   Jets of hadrons produced at high-energy colliders provide experimental access to the dynamics of asymptotically free quarks and gluons and their confinement into hadrons. In this paper, we show that the high energies of the Large Hadron Collider (LHC), together with the exceptional resolution of its detectors, allow multipoint correlation functions of energy flow operators to be directly measured within jets for the first time. Using Open Data from the CMS experiment, we show that reformulating jet substructure in terms of these correlators provides new ways of probing the dynamics of QCD jets, which enables direct imaging of the confining transition to free hadrons as well as precision measurements of the scaling properties and interactions of quarks and gluons. This opens a new era in our understanding of jet substructure and illustrates the immense unexploited potential of high-quality LHC data sets for elucidating the dynamics of QCD.

   ↳ hep-phhep-exnucl-exnucl-thPRL(2023)·180 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.