Mon·Apr 26, 2021Monday·April 26, 2021

1. 01*

   Signatures of QGP at RHIC and the LHC

   Takafumi Niida🇯🇵 · Yasuo Miake🇯🇵

   The progress over the 30 years since the first high-energy heavy-ion collisions at the BNL-AGS and CERN-SPS has been truly remarkable. Rigorous experimental and theoretical studies have revealed a new state of the matter in heavy-ion collisions, the quark-gluon plasma (QGP). Many signatures supporting the formation of the QGP have been reported. Among them are jet quenching, the non-viscous flow, direct photons, and Debye screening effects. In this article, selected signatures of the QGP observed at RHIC and the LHC are reviewed.

   nucl-exAAPPS Bull.(2021)·77 citations
2. 02*

   Streaming Readout of the CLAS12 Forward Tagger Using TriDAS and JANA2

   Fabrizio Ameli🇮🇹 · Marco Battaglieri🇺🇸 · Mariangela Bondí🇮🇹 · Andrea Celentano🇮🇹 · Sergey Boyarinov🇺🇸 · Nathan Brei🇺🇸 · Tommaso Chiarusi🇮🇹 · Raffaella De Vita🇮🇹 · Cristiano Fanelli🇺🇸 · Var-dan Gyurjyan🇺🇸 · David Lawrence🇺🇸 · Paolo Musico🇮🇹 and 3 other authors

   An effort is underway to develop streaming readout data acquisition system for the CLAS12 detector in Jefferson Lab's experimental Hall-B. Successful beam tests were performed in the spring and summer of 2020 using a 10GeV electron beam from Jefferson Lab's CEBAF accelerator. The prototype system combined elements of the TriDAS and CODA data acquisition systems with the JANA2 analysis/reconstruction framework. This successfully merged components that included an FPGA stream source, a distributed hit processing system, and software plugins that allowed offline analysis written in C++ to be used for online event filtering. Details of the system design and performance are presented.

   ↳ physics.ins-detnucl-exEPJ Web Conf.(2021)·5 citations
3. 03*

   Intermittency analysis of proton numbers in heavy-ion collisions at energies available at the BNL Relativistic Heavy Ion Collider

   Jin Wu🇨🇳 · Yufu Lin🇨🇳 · Zhiming Li🇨🇳 · Xiaofeng Luo🇨🇳 · Yuanfang Wu🇨🇳

   Local density fluctuations near the QCD critical point has been suggested to exhibit a power-law behavior which can be probed by an intermittency analysis on scaled factorial moment (SFM) in relativistic heavy-ion collisions. The collision energy and centrality dependence of the second-order SFMs are systematically investigated in Au $+$ Au collisions at $\sqrt{s_{NN}}$ = 7.7, 11.5, 19.6, 27, 39, 62.4, and 200 GeV within the UrQMD model. We estimate the noncritical background in the measurement of intermittency and propose a cumulative variable method to effectively remove the background contributions. We further study the effect of particle detection efficiency by implementing the RHIC (STAR) experimental tracking efficiencies in the UrQMD events. A cell-by-cell method is proposed for experimental application of efficiency corrections on SFM. This work can provide a guidance of background subtraction and efficiency correction for the experimental measurement of intermittency in the search of the QCD critical point in heavy-ion collisions.

   ↳ nucl-thhep-phnucl-exPRC(2021)·20 citations
4. 04*

   The SNO+ Experiment

   SNO+ Collaboration: V. Albanese🇨🇦 · R. Alves🇵🇹 · M. R. Anderson🇨🇦 · S. Andringa🇵🇹 · L. Anselmo🇨🇦 · E. Arushanova🇬🇧 · S. Asahi🇨🇦 · M. Askins🇺🇸 · D. J. Auty🇨🇦 · A. R. Back🇬🇧 · S. Back🇨🇦 · F. Barão🇵🇹 and 240 other authors

   The SNO+ experiment is located 2 km underground at SNOLAB in Sudbury, Canada. A low background search for neutrinoless double beta ($0\nu \beta \beta$) decay will be conducted using 780 tonnes of liquid scintillator loaded with 3.9 tonnes of natural tellurium, corresponding to 1.3 tonnes of ${}^{130}$Te. This paper provides a general overview of the SNO+ experiment, including detector design, construction of process plants, commissioning efforts, electronics upgrades, data acquisition systems, and calibration techniques. The SNO+ collaboration is reusing the acrylic vessel, PMT array, and electronics of the SNO detector, having made a number of experimental upgrades and essential adaptations for use with the liquid scintillator. With low backgrounds and a low energy threshold, the SNO+ collaboration will also pursue a rich physics program beyond the search for $0\nu \beta \beta$ decay, including studies of geo- and reactor antineutrinos, supernova and solar neutrinos, and exotic physics such as the search for invisible nucleon decay. The SNO+ approach to the search for $0\nu \beta \beta$ decay is scalable: a future phase with high ${}^{130}$Te-loading is envisioned to probe an effective Majorana mass in the inverted mass ordering region.

   ↳ physics.ins-dethep-exnucl-exJINST(2021)·219 citations
5. 05*

   Novel observables for exploring QCD collective evolution and quantum entanglement within individual jets

   Austin Baty🇺🇸 · Parker Gardner🇺🇸 · Wei Li🇺🇸

   We postulate that non-perturbative QCD effects occurring during parton fragmentation can result in collective effects of a multi-parton system, reminiscent of those observed in high-energy hadronic or nuclear interactions with large final-state particle multiplicity. Proton-proton collisions at the Large Hadron Collider showed surprising signatures of a strongly interacting, thermalized quark-gluon plasma, which was thought only to form in collisions of large nuclear systems. Another puzzle observed earlier in $e^{+}{e}^{-}$ collisions is that production yields of various hadron species appear to follow a thermal-like distribution with a common temperature. We propose searches for thermal and collective properties resulting from parton fragmentation processes using high multiplicity jets in high-energy elementary collisions. Several novel observables are studied using the PYTHIA 8 Monte Carlo event generator. Experimental observation of such collectivity will offer a new view of non-perturbative QCD dynamics of multi-parton systems at the smallest scales. Absence of any collective effects may offer new insights into the role of quantum entanglement in the observed thermal behavior of particle production in high energy collisions.

   ↳ hep-phhep-exnucl-exnucl-thPRC(2023)·37 citations
6. 06*

   "In-System" Fission-Events: An Insight into Puzzles of Exoplanets and Stars?

   Elizabeth P. Tito🇺🇸 · Vadim I. Pavlov🇫🇷

   In expansion of our recent proposal (Physics, 2020, 2, 213-276) that the solar system's evolution occurred in two stages -- during the first stage, the gaseous giants formed (via disk instability), and, during the second stage (caused by an encounter with a particular stellar-object leading to "in-system" fission-driven nucleogenesis), the terrestrial planets formed (via accretion) -- we emphasize here that the mechanism of formation of such stellar-objects is generally universal and therefore encounters of such objects with stellar-systems may have occurred elsewhere across galaxies. If so, their aftereffects may perhaps be observed as puzzling features in the spectra of individual stars (such as idiosyncratic chemical enrichments) and/or in the structures of exoplanetary systems (such as unusually high planet densities or short orbital periods). This paper reviews and reinterprets astronomical data within the "fission-events framework." Classification of stellar systems as "pristine" or "impacted" is offered.

   ↳ astro-ph.SRastro-ph.EPastro-ph.GAnucl-ex+1Universe(2021)·0 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.