Mon·Oct 9, 2017Monday·October 9, 2017

1. 01*

   The STAR MAPS-based PiXeL detector

   Giacomo Contin🇺🇸 · Leo Greiner🇺🇸 · Joachim Schambach🇺🇸 · Michal Szelezniak🇺🇸 · Eric Anderssen🇺🇸 · Jacque Bell🇺🇸 · Mario Cepeda🇺🇸 · Thomas Johnson🇺🇸 · Hao Qiu🇺🇸 · Hans-Georg Ritter🇺🇸 · Joseph Silber🇺🇸 · Thorsten Stezelberger🇺🇸 and 8 other authors

   The PiXeL detector (PXL) for the Heavy Flavor Tracker (HFT) of the STAR experiment at RHIC is the first application of the state-of-the-art thin Monolithic Active Pixel Sensors (MAPS) technology in a collider environment. Custom built pixel sensors, their readout electronics and the detector mechanical structure are described in detail. Selected detector design aspects and production steps are presented. The detector operations during the three years of data taking (2014-2016) and the overall performance exceeding the design specifications are discussed in the conclusive sections of this paper.

   ↳ physics.ins-dethep-exnucl-exNucl.Instrum.Meth.A(2018)·100 citations
2. 02*

   Heavy flavour in high-energy nuclear collisions: overview of transport calculations

   Andrea Beraudo🇮🇹

   Transport calculations are the tool to study medium modifications of heavy-flavour particle distributions in high-energy nuclear collisions. We give a brief overview on their state-of-the art as well as on the questions remaining open, from the evaluation of the transport coefficients to the effects of in-medium hadronization, from the rescattering in the hadronic phase to the possible presence of hot-medium effects also in small systems, like proton-nucleus collisions.

   ↳ hep-phnucl-exnucl-thPoS(2017)·0 citations
3. 03*

   Bottomonium suppression using a lattice QCD vetted potential

   Brandon Krouppa🇺🇸 · Alexander Rothkopf🇩🇪 · Michael Strickland🇺🇸

   We estimate bottomonium yields in relativistic heavy-ion collisions using a lattice QCD vetted, complex-valued, heavy-quark potential embedded in a realistic, hydrodynamically evolving medium background. We find that the lattice-vetted functional form and temperature dependence of the proper heavy-quark potential dramatically reduces the dependence of the yields on parameters other than the temperature evolution, strengthening the picture of bottomonium as QGP thermometer. Our results also show improved agreement between computed yields and experimental data produced in RHIC 200 GeV/nucleon collisions. For LHC 2.76 TeV/nucleon collisions, the excited states, whose suppression has been used as a vital sign for quark-gluon-plasma production in a heavy-ion collision, are reproduced better than previous perturbatively-motivated potential models; however, at the highest LHC energies our estimates for bottomonium suppression begin to underestimate the data. Possible paths to remedy this situation are discussed.

   ↳ hep-phnucl-exnucl-thPRD(2018)·86 citations
4. 04*

   Electric Dipole Moments of the Atoms, Molecules, Nuclei and Particles

   Timothy Chupp🇺🇸 · Peter Fierlinger🇩🇪 · Michael Ramsey-Musolf🇺🇸 · Jaideep Singh🇺🇸

   A permanent electric dipole moment (EDM) of a particle or system is a separation of charge along its angular-momentum axis and is a direct signal of T-violation and, assuming CPT symmetry, CP violation. For over sixty years EDMs have been studied, first as a signal of a parity-symmetry violation and then as a signal of CP violation that would clarify its role in nature and in theory. Contemporary motivations include the role that CP violation plays in explaining the cosmological matter-antimatter asymmetry and the search for new physics. Experiments on a variety of systems have become ever-more sensitive, but provide only upper limits on EDMs, and theory at several scales is crucial to interpret these limits. Nuclear theory provides connections from Standard-Model and Beyond-Standard-Model physics to the observable EDMs, and atomic and molecular theory reveal how CP-violation is manifest in these systems. EDM results in hadronic systems require that the Standard Model QCD parameter of $\bar{\theta }$ must be exceptionally small, which could be explained by the existence of axions - also a candidate dark-matter particle. Theoretical results on electroweak baryogenesis show that new physics is needed to explain the dominance of matter in the universe. Experimental and theoretical efforts continue to expand with new ideas and new questions, and this review provides a broad overview of theoretical motivations and interpretations as well as details about experimental techniques, experiments, and prospects. The intent is to provide specifics and context as this exciting field moves forward.

   ↳ physics.atom-phhep-phnucl-exnucl-thRMP(2019)·477 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.