Now showing items 1-20 of 1806

    • Evidence for X(3872) in Pb-Pb Collisions and Studies of its Prompt Production at √sNN = 5.02 TeV 

      CMS Collaboration (2022)
      The first evidence for X(3872) production in relativistic heavy ion collisions is reported. The X(3872) production is studied in lead-lead (Pb-Pb) collisions at a center-of-mass energy of √sNN=5.02 TeV per nucleon pair, using the decay chain X(3872)→J/ψπ+π−→μ+μ−π+π−. The data were recorded with the CMS detector in 2018 and correspond to an integrated ...
    • Search for heavy resonances decaying to WW, WZ, or WH boson pairs in a final state consisting of a lepton and a large-radius jet in proton-proton collisions at √s=13 TeV 

      CMS Collaboration (2022)
      A search for new heavy resonances decaying to pairs of bosons (WW, WZ, or WH) is presented. The analysis uses data from proton-proton collisions collected with the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 137 fb−1. One of the bosons is required to be a W boson decaying to an electron or muon and ...
    • TESS Hunt for Young and Maturing Exoplanets (THYME). VI. An 11 Myr Giant Planet Transiting a Very-low-mass Star in Lower Centaurus Crux 

      Mann, Andrew W.; Wood, Mackenna L.; Schmidt, Stephen P.; Barber, Madyson G.; Owen, James E.; (2022)
      Mature super-Earths and sub-Neptunes are predicted to be ≃ Jovian radius when younger than 10 Myr. Thus, we expect to find 5–15 R ⊕ planets around young stars even if their older counterparts harbor none. We report the discovery and validation of TOI 1227b, a 0.85 ± 0.05 R J (9.5 R ⊕) planet transiting a very-low-mass star (0.170 ± 0.015 M ⊙) every ...
    • X-Ray Burst and Persistent Emission Properties of the Magnetar SGR 1830-0645 in Outburst 

      Younes, George; Hu, Chin-Ping; Bansal, Karishma; Ray, Paul S.; Pearlman, Aaron B.; (2022)
      We report on NICER X-ray monitoring of the magnetar SGR 1830−0645 covering 223 days following its 2020 October outburst, as well as Chandra and radio observations. We present the most accurate spin ephemerides of the source so far: ν = 0.096008680(2) Hz, Hz s−1, and significant second and third frequency derivative terms indicative of nonnegligible ...
    • DNA supercoiling-mediated collective behavior of co-transcribing RNA polymerases 

      Tripathi, Shubham; Brahmachari, Sumitabha; Onuchic, José N; Levine, Herbert; Center for Theoretical Biological Physics (2022)
      Multiple RNA polymerases (RNAPs) transcribing a gene have been known to exhibit collective group behavior, causing the transcription elongation rate to increase with the rate of transcription initiation. Such behavior has long been believed to be driven by a physical interaction or ‘push’ between closely spaced RNAPs. However, recent studies have ...
    • Flows in Enthalpy-based Thermal Evolution of Loops 

      Rajhans, Abhishek; Tripathi, Durgesh; Bradshaw, Stephen J.; Kashyap, Vinay L.; Klimchuk, James A. (2022)
      Plasma-filled loop structures are common in the solar corona. Because detailed modeling of the dynamical evolution of these structures is computationally costly, an efficient method for computing approximate but quick physics-based solutions is to rely on space-integrated 0D simulations. The enthalpy-based thermal evolution of loops (EB℡) framework ...
    • DLPacker: Deep learning for prediction of amino acid side chain conformations in proteins 

      Misiura, Mikita; Shroff, Raghav; Thyer, Ross; Kolomeisky, Anatoly B.; Center for Theoretical Biological Physics (2022)
      Prediction of side chain conformations of amino acids in proteins (also termed “packing”) is an important and challenging part of protein structure prediction with many interesting applications in protein design. A variety of methods for packing have been developed but more accurate ones are still needed. Machine learning (ML) methods have recently ...
    • Can we understand the mechanisms of tumor formation by analyzing dynamics of cancer initiation? 

      Teimouri, Hamid; Kolomeisky, Anatoly B.; Center for Theoretical Biological Physics (2022)
      Cancer is a collection of related genetic diseases exhibiting uncontrolled cell growth that interferes with normal functioning of human organisms. It results from accumulation of unfavorable mutations in tissues. While the biochemical picture of how cancer appears is known, the molecular mechanisms of tumor formation remain not fully understood despite ...
    • The Magnetic Genome of Two-Dimensional van der Waals Materials 

      Wang, Qing Hua; Bedoya-Pinto, Amilcar; Blei, Mark; Dismukes, Avalon H.; Hamo, Assaf; (2022)
      Magnetism in two-dimensional (2D) van der Waals (vdW) materials has recently emerged as one of the most promising areas in condensed matter research, with many exciting emerging properties and significant potential for applications ranging from topological magnonics to low-power spintronics, quantum computing, and optical communications. In the brief ...
    • Observation of Bs0 mesons and measurement of the Bs0/B+ yield ratio in PbPb collisions at Image 1 TeV 

      The CMS Collaboration (2022)
      The Bs0 and B+ production yields are measured in PbPb collisions at a center-of-mass energy per nucleon pair of 5.02 TeV. The data sample, collected with the CMS detector at the LHC, corresponds to an integrated luminosity of 1.7 nb−1. The mesons are reconstructed in the exclusive decay channels B→s0J/ψ(μ+μ−)ϕ(K+K−) and B→+J/ψ(μ+μ−)K+, in the transverse ...
    • Magnonic superradiant phase transition 

      Bamba, Motoaki; Li, Xinwei; Marquez Peraca, Nicolas; Kono, Junichiro (2022)
      In the superradiant phase transition (SRPT), coherent light and matter fields are expected to appear spontaneously in a coupled light–matter system in thermal equilibrium. However, such an equilibrium SRPT is forbidden in the case of charge-based light–matter coupling, known as no-go theorems. Here, we show that the low-temperature phase transition ...
    • Static and dynamic solar coronal loops with cross-sectional area variations 

      Cargill, P.J.; Bradshaw, S.J.; Klimchuk, J.A.; Barnes, W.T. (2022)
      The Enthalpy Based Thermal Evolution of Loops approximate model for static and dynamic coronal loops is developed to include the effect of a loop cross-sectional area which increases from the base of the transition region (TR) to the corona. The TR is defined as the part of a loop between the top of the chromosphere and the location where thermal ...
    • Hall effect in gated single-wall carbon nanotube films 

      Yomogida, Yohei; Horiuchi, Kanako; Okada, Ryotaro; Kawai, Hideki; Ichinose, Yota; (2022)
      The presence of hopping carriers and grain boundaries can sometimes lead to anomalous carrier types and density overestimation in Hall-effect measurements. Previous Hall-effect studies on carbon nanotube films reported unreasonably large carrier densities without independent assessments of the carrier types and densities. Here, we have systematically ...
    • Compressive Hyperspectral Microscopy of Scattering and Fluorescence of Nanoparticles 

      Xu, Yibo; Lu, Liyang; Giljum, Anthony; Payne, Courtney M.; Hafner, Jason H.; (2022)
      Hyperspectral imaging in optical microscopy is of importance in the study of various submicron physical and chemical phenomena. However, its practical application is still challenging because the additional spectral dimension increases the number of sampling points to be independently measured compared to two-dimensional (2D) imaging. Here, we present ...
    • Thermal coupled cluster theory for SU(2) systems 

      Harsha, Gaurav; Xu, Yi; Henderson, Thomas M.; Scuseria, Gustavo E. (2022)
      Coupled cluster (CC) has established itself as a powerful theory to study correlated quantum many-body systems. Finite-temperature generalizations of CC theory have attracted considerable interest and have been shown to work as nicely as the ground-state theory. However, most of these recent developments address only fermionic or bosonic systems. The ...
    • Laser-induced-fluorescence imaging of a spin-polarized ultracold neutral plasma in a magnetic field 

      Gorman, G.M.; Warrens,M.K.; Bradshaw, S.J.; Killian, T.C. (2022)
      We report Doppler-sensitive laser-induced-fluorescence (LIF) imaging of an ultracold neutral plasma in a magnetic field. Local values of ion density, hydrodynamic fluid velocity, temperature, and spin polarization are obtained using a fluorescence model based on velocity-resolved rate equations (REs) including the transfer of ions between states due ...
    • Search for Wγ resonances in proton-proton collisions at s=13 TeV using hadronic decays of Lorentz-boosted W bosons 

      The CMS Collaboration (2022)
      A search for Wγ resonances in the mass range between 0.7 and 6.0 TeV is presented. The W boson is reconstructed via its hadronic decays, with the final-state products forming a single large-radius jet, owing to a high Lorentz boost of the W boson. The search is based on proton-proton collision data at s=13 TeV, corresponding to an integrated luminosity ...
    • Light nuclei collectivity from sNN=3 GeV Au+Au collisions at RHIC 

      STAR Collaboration (2022)
      In high-energy heavy-ion collisions, partonic collectivity is evidenced by the constituent quark number scaling of elliptic flow anisotropy for identified hadrons. A breaking of this scaling and dominance of baryonic interactions is found for identified hadron collective flow measurements in sNN = 3 GeV Au+Au collisions. In this paper, we report ...
    • Charge-neutral fermions and magnetic field-driven instability in insulating YbIr3Si7 

      Sato, Y.; Suetsugu, S.; Tominaga, T.; Kasahara, Y.; Kasahara, S.; (2022)
      Kondo lattice materials, where localized magnetic moments couple to itinerant electrons, provide a very rich backdrop for strong electron correlations. They are known to realize many exotic phenomena, with a dramatic example being recent observations of quantum oscillations and metallic thermal conduction in insulators, implying the emergence of ...
    • Pulse Peak Migration during the Outburst Decay of the Magnetar SGR 1830-0645: Crustal Motion and Magnetospheric Untwisting 

      Younes, George; Lander, Samuel K.; Baring, Matthew G.; Enoto, Teruaki; Kouveliotou, Chryssa; (2022)
      Magnetars, isolated neutron stars with magnetic-field strengths typically ≳1014 G, exhibit distinctive months-long outburst epochs during which strong evolution of soft X-ray pulse profiles, along with nonthermal magnetospheric emission components, is often observed. Using near-daily NICER observations of the magnetar SGR 1830-0645 during the first ...