Wed·Nov 22, 2017Wednesday·November 22, 2017

1. 01*

   Principal component analysis of the nonlinear coupling of harmonic modes in heavy-ion collisions

   Piotr Bozek🇵🇱

   The principal component analysis of flow correlations in heavy-ion collisions is studied. The correlation matrix of harmonic flow is generalized to correlations involving several different flow vectors. The method can be applied to study the nonlinear coupling between different harmonic modes in a double differential way in transverse momentum or pseudorapidity. The procedure is illustrated with results from the hydrodynamic model applied to Pb+Pb collisions at $\sqrt{s}=2760$GeV. Three examples of generalized correlations matrices in transverse momentum are constructed corresponding to the coupling of $v_2^2$ and $v_4$, of $v_2{v}_3$ and $v_5$, or of $v_2^3$, $v_3^3$, and $v_6$. The principal component decomposition is applied to the correlation matrices and the dominant modes are calculated.

   ↳ nucl-thhep-phnucl-exPRC(2018)·22 citations
2. 02*

   Radon mitigation during the installation of the CUORE $0\nu \beta \beta$ decay detector

   G. Benato · D. Biare · C. Bucci · L. Di Paolo · A. Drobizhev · R. W. Kadel · Yu. G. Kolomensky · J. Schreiner · V. Singh · T. Sipla · J. Wallig · S. Zimmermann

   CUORE - the Cryogenic Underground Observatory for Rare Events - is an experiment searching for the neutrinoless double-beta ($0\nu \beta \beta$) decay of ${}^{130}$Te with an array of 988 TeO${}_2$ crystals operated as bolometers at $\sim$10 mK in a large dilution refrigerator. With this detector, we aim for a ${}^{130}$Te $0\nu \beta \beta$ decay half-life sensitivity of $9\times 10^{25}$ y with 5 y of live time, and a background index of $\lesssim 10^{-2}$ counts/keV/kg/y. Making an effort to maintain radiopurity by minimizing the bolometers' exposure to radon gas during their installation in the cryostat, we perform all operations inside a dedicated cleanroom environment with a controlled radon-reduced atmosphere. In this paper, we discuss the design and performance of the CUORE Radon Abatement System and cleanroom, as well as a system to monitor the radon level in real time.

   ↳ physics.ins-detnucl-exJINST(2018)·27 citations
3. 03*

   Three-fluid Hydrodynamics-based Event Simulator Extended by UrQMD final State interactions (THESEUS) for FAIR-NICA-SPS-BES/RHIC energies

   P. Batyuk🇷🇺 · D. Blaschke🇵🇱 · M. Bleicher🇩🇪 · Yu.B. Ivanov🇷🇺 · Iu. Karpenko🇮🇹 · L. Malinina🇷🇺 · S. Merts🇷🇺 · M. Nahrgang🇫🇷 · H. Petersen🇩🇪 · O. Rogachevsky🇷🇺

   We present a new event generator based on the three-fluid hydrodynamics (3FH) approach, followed by a particlization at the hydrodynamic decoupling surface and a subsequent UrQMD afterburner stage based on the microscopic UrQMD transport model that accounts for hadronic final state interactions. First results for Au+Au collisions are presented. The following topics are addressed: the directed flow, transverse-mass spectra, as well as rapidity distributions of protons, pions and kaons for two model equations of state, one with a first-order phase transition, the other with a crossover transition. Preliminary results on the femtoscopy are also discussed. We analyze the accuracy of reproduction of the 3FH results by the new event generator and the effect of the subsequent UrQMD afterburner stage.

   ↳ nucl-thhep-exhep-phnucl-exEPJ Web Conf.(2018)·18 citations
4. 04*

   Pion Condensation by Rotation in a Magnetic field

   Yizhuang Liu🇺🇸 · Ismail Zahed🇺🇸

   We show that the combined effects of a rotation plus a magnetic field can cause charged pion condensation. We suggest that this phenomenon may yield to observable effects in current heavy ion collisions at collider energies, where large magnetism and rotations are expected in off-central collisions.

   ↳ hep-phhep-thnucl-exnucl-thPRL(2018)·81 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.