Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Physics

Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 1561 - 1590 of 14618

Full-Text Articles in Entire DC Network

Updated Constraints From The Effective Field Theory Analysis Of The Boss Power Spectrum On Early Dark Energy, T. Simon, P. Zhang, V. Poulin, Tristan L. Smith Mar 2023

Updated Constraints From The Effective Field Theory Analysis Of The Boss Power Spectrum On Early Dark Energy, T. Simon, P. Zhang, V. Poulin, Tristan L. Smith

Physics & Astronomy Faculty Works

Analyses of the full shape of the Baryon Oscillation Spectroscopic Survey (BOSS) DR12 power spectrum using the one-loop prediction from the effective field theory of large-scale structures (EFTBOSS) have led to new constraints on extensions to the Λ cold dark matter model, such as early dark energy (EDE), which has been suggested as a resolution to the “Hubble tension.” In this paper, we reassess the constraining power of the EFTBOSS on EDE in light of a correction to the normalization of BOSS window functions. Overall we find that constraints from EFTBOSS on EDE are weakened and represent a small change …

Go to article

Cross Sections Of The 83rb (P,Γ)84sr And 84kr(P,Γ)85rb Reactions At Energies Characteristic Of The Astrophysical Γ Process, M. Williams, B. Davids, G. Lotay, N. Nishimura, T. Rauscher, S. A. Gillespie, M. Alcorta, Alan M. Amthor, G. C. Ball, S. S. Bhattacharjee, V. Bildstein, W. N. Catford, D. T. Doherty, N. E. Esker, A. B. Garnsworthy, G. Hackman, K. Hudson, A. Lennarz, C. Natzke, B. Olaizola, A. Psaltis, C. E. Svensson, J. Williams, D. Walter, D. Yates Mar 2023

Cross Sections Of The 83rb (P,Γ)84sr And 84kr(P,Γ)85rb Reactions At Energies Characteristic Of The Astrophysical Γ Process, M. Williams, B. Davids, G. Lotay, N. Nishimura, T. Rauscher, S. A. Gillespie, M. Alcorta, Alan M. Amthor, G. C. Ball, S. S. Bhattacharjee, V. Bildstein, W. N. Catford, D. T. Doherty, N. E. Esker, A. B. Garnsworthy, G. Hackman, K. Hudson, A. Lennarz, C. Natzke, B. Olaizola, A. Psaltis, C. E. Svensson, J. Williams, D. Walter, D. Yates

Faculty Journal Articles

We have measured the cross section of the 83 Rb ( p , γ ) 84 Sr radiative capture reaction in inverse kinematics using a radioactive beam of 83 Rb at incident energies of 2.4 and 2.7 A MeV. Prior to the radioactive beam measurement, the 84 Kr ( p , γ ) 85 Rb radiative capture reaction was measured in inverse kinematics using a stable beam of 84 Kr at an incident energy of 2.7 A MeV. The effective relative kinetic energies of these measurements lie within the relevant energy window for the γ process in supernovae. The central …

Go to article

Effective Connectivity Of Functional Mri Via Deep Learning Methods, Kai-Cheng Chuang Mar 2023

Effective Connectivity Of Functional Mri Via Deep Learning Methods, Kai-Cheng Chuang

LSU Doctoral Dissertations

Effective connectivity, based on functional magnetic resonance imaging (fMRI) time series signals, is the quantification of how strongly brain activity in a certain source brain region contributes to brain activity in a target brain region, independent of the contributions of other source regions. Current methods to solve this problem have several limitations. They are either unable to model nonlinear relationships between source and target signals, unable to efficiently quantify time lags in source-target relationships, unable to identify time-varying relationships, or fail to account for variability in the hemodynamic response function that converts neuron activity to a measurable signal. In this …

Go to article

Nagase2: A Water-Loving Multifunctional Non-Van Der Waals Layered Selenogallate, Srikanth Balijapelly, Santhoshkumar Sundaramoorthy, Dibya Jyoti Mondal, Sanjit Konar, Nikolay Gerasimchuk, Aleksandr V. Chernatynskiy, Amitava Choudhury Mar 2023

Nagase2: A Water-Loving Multifunctional Non-Van Der Waals Layered Selenogallate, Srikanth Balijapelly, Santhoshkumar Sundaramoorthy, Dibya Jyoti Mondal, Sanjit Konar, Nikolay Gerasimchuk, Aleksandr V. Chernatynskiy, Amitava Choudhury

Physics Faculty Research & Creative Works

A Missing Member of Well-Known Ternary Chalcometallates, a Sodium Selenogallate, NaGaSe2, Has Been Synthesized by Employing a Polyselenide Flux and Stoichiometric Reaction. Crystal Structure Analysis using X-Ray Diffraction Techniques Reveals that It Contains Supertetrahedral Adamantane-Type Ga4Se10 Secondary Building Units. These Ga4Se10 Secondary Building Units Are Further Connected Via Corners to Form Two-Dimensional (2D) [GaSe2]∞- Layers Stacked Along the C-Axis of the Unit Cell, and the Na Ions Reside in the Interlayer Space. the Compound Has an Unusual Ability to Absorb Water Molecules from the Atmosphere or a Nonanhydrous …

Go to article

Vibrational Dynamics In The Undercooled Liquid Of Ultra-Fragile Metallic Glasses, Hillary L. Smith, C. N. Saunders, C. Bernal-Choban, S. H. Lohaus, C. J. Stoddard, L. K. Decker, J. Y. Y. Lin, J. L. Niedziela, D. L. Abernathy, J.-H. Na, M. D. Demetriou, B. Fultz Mar 2023

Vibrational Dynamics In The Undercooled Liquid Of Ultra-Fragile Metallic Glasses, Hillary L. Smith, C. N. Saunders, C. Bernal-Choban, S. H. Lohaus, C. J. Stoddard, L. K. Decker, J. Y. Y. Lin, J. L. Niedziela, D. L. Abernathy, J.-H. Na, M. D. Demetriou, B. Fultz

Physics & Astronomy Faculty Works

The lattice vibrational dynamics in ultra-fragile Pt57Cu23P20 and Pt60Cu20P20 glasses were investigated using in situ inelastic neutron scattering to measure the evolution of the phonon density of states (DOS) through the glass transition, into the undercooled liquid phase, and through crystallization. The phonon DOS curves are remarkably similar for the undercooled liquids and the amorphous solids. The vibrational entropy was obtained with these phonon DOS curves, and changes in vibrational entropy caused by the glass transition are less than 0.05kB/atom. For these highly fragile metal/metalloid glasses, the excess vibrational entropy of the …

Go to article

Superconductivity And Fermi Surface Studies Of Β″-(Bedt-Ttf)2[(H2o)(Nh4)2cr(C2o4)3]·18-Crown-6, Brett Laramee, Raju Ghimire, David Graf, Lee Martin, Toby J. Blundell, Charles Agosta Mar 2023

Superconductivity And Fermi Surface Studies Of Β″-(Bedt-Ttf)2[(H2o)(Nh4)2cr(C2o4)3]·18-Crown-6, Brett Laramee, Raju Ghimire, David Graf, Lee Martin, Toby J. Blundell, Charles Agosta

Physics

We report rf-penetration depth measurements of the quasi-2D organic superconductor (Formula presented.) -(BEDT-TTF) (Formula presented.) [(H (Formula presented.) O)(NH (Formula presented.)) (Formula presented.) Cr(C (Formula presented.) O (Formula presented.)) (Formula presented.)]·18-crown-6, which has the largest separation between consecutive conduction layers of any 2D organic metal with a single packing motif. Using a contactless tunnel diode oscillator measurement technique, we show the zero-field cooling dependence and field sweeps up to 28 T oriented at various angles with respect to the crystal conduction planes. When oriented parallel to the layers, the upper critical field, (Formula presented.) T, which is the calculated paramagnetic …

Go to article

Coupling To Quantum Topological Order In Superconducting Qubit Systems, Seth T. Hyra Mar 2023

Coupling To Quantum Topological Order In Superconducting Qubit Systems, Seth T. Hyra

Theses and Dissertations

The coupling of superconducting qubits to non-trivial topological phases offers a means of improving existing quantum computational capabilities in lieu of a fully realized topological quantum computer. I will show that although such systems do not completely avoid the necessary errors associated with an energetic qubit basis, they do provide a potential avenue for decoherence free quantum memory. Further, the physics behind such systems enables exploration of the nature of non-Abelian anyons, as well as the remaining challenges in realization of true topological quantum computation.

Go to article

Microbial Motility At The Bottom Of North America: Digital Holographic Microscopy And Genomic Motility Signatures In Badwater Spring, Death Valley National Park, Carl Snyder, Jakob P. Centlvre, Shrikant Bhute, Jay Nadeau, Multiple Additional Authors Mar 2023

Microbial Motility At The Bottom Of North America: Digital Holographic Microscopy And Genomic Motility Signatures In Badwater Spring, Death Valley National Park, Carl Snyder, Jakob P. Centlvre, Shrikant Bhute, Jay Nadeau, Multiple Additional Authors

Physics Faculty Publications and Presentations

Motility is widely distributed across the tree of life and can be recognized by microscopy regardless of phylogenetic affiliation, biochemical composition, or mechanism. Microscopy has thus been proposed as a potential tool for detection of biosignatures for extraterrestrial life; however, traditional light microscopy is poorly suited for this purpose, as it requires sample preparation, involves fragile moving parts, and has a limited volume of view. In this study, we deployed a field-portable digital holographic microscope (DHM) to explore microbial motility in Badwater Spring, a saline spring in Death Valley National Park, and complemented DHM imaging with 16S rRNA gene amplicon …

Go to article

A Simple In Situ Method For Optimizing Settings For The Einzel Lens Elements In A Focused Ion Beam, Rich Swinford, Erik Sanchez Mar 2023

A Simple In Situ Method For Optimizing Settings For The Einzel Lens Elements In A Focused Ion Beam, Rich Swinford, Erik Sanchez

Physics Faculty Publications and Presentations

Ion beams have had an incredible impact on research in the past couple of decades. One major reason for this is the continued development of systems having optimal beam currents that allows one to image more clearly at different spot sizes to include higher currents that allow for faster milling. The advancements for Focused ion beam (FIB) columns have developed rapidly due to the computational optimization of lens designs. However, once a system has been produced, the optimal column settings for these lenses may change or simply become obscure. Our work involves regaining this optimization with the newly applied values …

Go to article

Characterizing Gesn Alloys By Sem/Eds And Photoluminescence Spectroscopy, Christopher M. Sutphin Mar 2023

Characterizing Gesn Alloys By Sem/Eds And Photoluminescence Spectroscopy, Christopher M. Sutphin

Theses and Dissertations

Germanium tin (GeSn) alloys are being studied as potential transition metal (Group IV) photoelectric semiconductors or optical detectors. GeSn alloys could be employed as an optically active material within a computer. Compared to current technologies, a direct band gap GeSn alloy can be engineered to operate with higher thermal stability and efficiency. The GeSn alloy studied was composed of Ge and Si substrates with various Sn percentages grown using remote plasma-enhanced chemical vapor deposition (RPECVD). Photoluminescence spectroscopy (PL) techniques were initially used to determine the GeSn properties, including the band gap. The Ge91.2Sn8.8 PL spectra suggested the …

Go to article

Simulation Of Neutron Generation From Laser-Driven Fusion In A Liquid D2o Sheet Using Novel Warpx Module, Colton R. Stoner Mar 2023

Simulation Of Neutron Generation From Laser-Driven Fusion In A Liquid D2o Sheet Using Novel Warpx Module, Colton R. Stoner

Theses and Dissertations

Using WarpX’s new nuclear fusion module, this work attempts to model an experimental system at the ELL at the AFIT with WarpX and draw conclusions about fusion products from resulting simulations. Recently, a table-top, high repetition rate, mixed radiation source was demonstrated at the ELL employing a HIL to fuse the deuterium nuclei present in a unique liquid target of heavy water. Analysis of the simulations predicted an isotropic output of neutrons from deuterium-deuterium fusion. These simulated neutrons were created in tens of femtoseconds from dense bodies of deuterons that were perturbed by the laser. However, it was found that …

Go to article

Modeling Radiation Exposure On Flight Missions To Analyze Aircrew Risk, Camila V. Quintero Hilsaca Mar 2023

Modeling Radiation Exposure On Flight Missions To Analyze Aircrew Risk, Camila V. Quintero Hilsaca

Theses and Dissertations

GCR and SPE comprise the majority of the ionizing radiation experienced in the upper atmosphere within flight-altitude environments. Although previous studies have analyzed radiation doses from single sources on civilian flight operations, there is a lack of research focused on dose received by military personnel during flight from both sources simultaneously. In-flight radiation environments are modeled through the MCNP6 for two separate aircraft, an Air Force A-10 and a Boeing 737. Particle fluence values for galactic cosmic rays and solar particle events for four separate flight paths are determined using the CARI-7A software and the SIRE2 toolkit, respectively. MCNP6 code …

Go to article

Pulsed Power Neutron Production With Deuterated Polymer Accelerator Targets, Anthony O. Hagey Mar 2023

Pulsed Power Neutron Production With Deuterated Polymer Accelerator Targets, Anthony O. Hagey

Theses and Dissertations

This document presents an investigation of the effect of deuterated polyethylene accelerator targets on the neutron fluence from a local mass injection dense plasma focus driven by the United States Naval Research Laboratory’s Hawk pulsed-power generator. After successful production of thin targets, the acquisition of thicker targets, and testing inside Hawk, it was found that the presence of a deuterated polyethylene target increased the neutron fluence. Results suggested that fluence can significantly increase with the presence of a deuterated target vs a nondeuterated target. Additive manufacturing printing was used as a production method in order to determine if deuterated accelerator …

Go to article

Feasibility Study On The Characterization Of Mars Atmospheric And Surface Features In Spacecraft Images By Machine Learning And Similar Automated Methods, Hind Hassan Alriyami Mar 2023

Feasibility Study On The Characterization Of Mars Atmospheric And Surface Features In Spacecraft Images By Machine Learning And Similar Automated Methods, Hind Hassan Alriyami

Theses

This thesis is focused on automated detection of Mars atmospheric and surface features in spacecraft images based on machine learning and similar automated methods using crater detection algorithm (CDA) software, named DeepMars2 algorithm. The purpose of this study is to perform machine learning to detect coarse and high-resolution topography craters on mars. The algorithm is applied to two digital elevation models (DEMs) of the Mars surface with high and coarse resolution in order to identify craters using machine and deep learning methods. The DEMs are based on the satellite instruments MOLA/MGS (Mars Orbiter Laser Altimeter/Mars Global Surveyor) and HRSC/MEX (High …

Go to article

Description Of Reaction And Vibrational Energetics Of Co2-Nh3interaction Using Quantum Computing Algorithms, Manh Tien Nguyen, Yueh-Lin Lee, Dominic Alfonso, Qing Shao, Yuhua Duan Mar 2023

Description Of Reaction And Vibrational Energetics Of Co2-Nh3interaction Using Quantum Computing Algorithms, Manh Tien Nguyen, Yueh-Lin Lee, Dominic Alfonso, Qing Shao, Yuhua Duan

Markey Cancer Center Faculty Publications

CO2 capture is critical to solving global warming. Amine-based solvents are extensively used to chemically absorb CO2. Thus, it is crucial to study the chemical absorption of CO2 by amine-based solvents to better understand and optimize CO2 capture processes. Here, we use quantum computing algorithms to quantify molecular vibrational energies and reaction pathways between CO2 and a simplified amine-based solvent model—NH3. Molecular vibrational properties are important to understanding kinetics of reactions. However, the molecule size correlates with the strength of anharmonicity effect on vibrational properties, which can be challenging to address using classical computing. Quantum computing can help enhance molecular …

Go to article

Design And Assessment Of A Leo Gnss Miniconstellation For Positioning, Navigation, And Timing (Pnt), Mariya Abdulkhaleq Mohamad Mar 2023

Design And Assessment Of A Leo Gnss Miniconstellation For Positioning, Navigation, And Timing (Pnt), Mariya Abdulkhaleq Mohamad

Theses

Recently, there has been a resurgent demand in the United Arab Emirates for more accurate positioning, navigation, and timing signals, especially for some targeted applications such as autonomous vehicles and flying taxis. The existing Global Navigation Satellite Systems (GNSS) provide real-time positioning accuracy for up to several meters, while the targeted applications require fast convergence of centimeterlevel positioning accuracy. Recent studies have shown that transmitting GNSS signals from a Low Earth Orbit (LEO) instead of a Medium Earth Orbit (MEO) would enhance positioning accuracy. The main objective of this thesis is to design and simulate an optimum scenario of a …

Go to article

The Three-Dimensional Visualization Of Mars Dust Storms Based On Deriving Digital Elevation Maps From Satellite Imagery, Meirah Ali Alzeyoudi Mar 2023

The Three-Dimensional Visualization Of Mars Dust Storms Based On Deriving Digital Elevation Maps From Satellite Imagery, Meirah Ali Alzeyoudi

Theses

This work focuses on generating a Three-Dimensional Visualization of Mars's local dust storms utilizing satellite images from publicly available archives. The work aimed to create a Three-Dimensional Visualization of two Local Dust storms, the first local dust storm occurred on May 20, 2020, in the Chryse Planitia Region of Mars, while the second one occurred on 8 June 2021, on the northern side of the Utopia Planitia Region of Mars. The visualization will assist in providing a better understanding of the dynamics of Dust Storms on Mars by indicating and analyzing the main features of dust storms on Mars. Also, …

Go to article

Insights Into Receptor Structure And Dynamics At The Surface Of Living Cells, Frederik Steiert, Peter Schultz, Siegfried Höfinger, Thomas D. Müller, Petra Schwille, Thomas Weidemann Mar 2023

Insights Into Receptor Structure And Dynamics At The Surface Of Living Cells, Frederik Steiert, Peter Schultz, Siegfried Höfinger, Thomas D. Müller, Petra Schwille, Thomas Weidemann

Michigan Tech Publications, Part 1

Evaluating protein structures in living cells remains a challenge. Here, we investigate Interleukin-4 receptor alpha (IL-4Rα) into which the non-canonical amino acid bicyclo[6.1.0]nonyne-lysine (BCNK) is incorporated by genetic code expansion. Bioorthogonal click labeling is performed with tetrazine-conjugated dyes. To quantify the reaction yield in situ, we develop brightness-calibrated ratiometric imaging, a protocol where fluorescent signals in confocal multi-color images are ascribed to local concentrations. Screening receptor mutants bearing BCNK in the extracellular domain uncovered site-specific variations of both click efficiency and Interleukin-4 binding affinity, indicating subtle well-defined structural perturbations. Molecular dynamics and continuum electrostatics calculations suggest solvent polarization to determine …

Go to article

Speed Of Sound For Hadronic And Quark Phases In A Magnetic Field, Efrain J. Ferrer, Aric Hackebill Mar 2023

Speed Of Sound For Hadronic And Quark Phases In A Magnetic Field, Efrain J. Ferrer, Aric Hackebill

Physics & Astronomy Faculty Publications

In this paper we calculate the speed of sound for three phases that may exist inside a magnetized hybrid neutron star at different density regions: A hadronic phase at low densities, quark-matter in the magnetic dual chiral density wave (MDCDW) phase at intermediate densities and a free-quark phase modeled by the MIT bag model at higher densities. It is found that the speed of sound exhibits a non-monotonic behavior, that goes from values smaller than the conformal limit ( c 2 s < 1 / 3 ) in the hadronic phase, to peak ( c 2 s > 1 / 3 ) in the MDCDW phase, to finally reach the conformal limit ( c 2 s …

Go to article

Analog Holographic Wavefront Sensor For Defocus And Spherical Aberration Measurement Recorded In A Photopolymer, Emma Branigan, Suzanne Martin, Matthew Sheehan, Kevin Murphy Feb 2023

Analog Holographic Wavefront Sensor For Defocus And Spherical Aberration Measurement Recorded In A Photopolymer, Emma Branigan, Suzanne Martin, Matthew Sheehan, Kevin Murphy

Articles

An analog holographic wavefront sensor (AHWFS), for measurement of low and high order (defocus and spherical aberration) aberration modes has been developed as volume phase holograms in a photopolymer recording medium. This is the first time that high order aberrations such as spherical aberration can be sensed using a volume hologram in a photosensitive medium. Both defocus and spherical aberration were recorded in a multi-mode version of this AHWFS. Refractive elements were used to generate a maximum and minimum phase delay of each aberration which were multiplexed as a set of volume phase holograms in an acrylamide based-photopolymer layer. The …

Go to article

Electronic Structure Calculations Of Static Hyper(Polarizabilities) Of Substrate-Supported Group-Iv And -V Elemental Monolayers, Sumandeep Kaur, Ravindra Pandey, Shashi P. Karna Feb 2023

Electronic Structure Calculations Of Static Hyper(Polarizabilities) Of Substrate-Supported Group-Iv And -V Elemental Monolayers, Sumandeep Kaur, Ravindra Pandey, Shashi P. Karna

Michigan Tech Publications, Part 1

The substrate-induced effects on the polarizability (α) and first dipole hyperpolarizability (β) of group-IV (i.e., graphene, silicene, germanene, stanene) and group-V (i.e., phosphorene, arsenene, antimonene, and bismuthene) elemental monolayer nanoflakes are investigated. Density functional theory calculations show that these monolayers are bound with varying degrees of interaction strength with the Ag(111) substrate surface. Calculated dipole moment and β values are zero for the centrosymmetric configurations of the pristine elemental monolayers. On the other hand, substrate-induced changes in the electronic densities at the interface lead to substantially enhanced values of β, making these materials attractive for applications in the next-generation photonic …

Go to article

Characterizing Particle Bed Stratigraphy As A Function Of Particle Size In An Airless, Microgravity Environment, Gillian Gomer, Michael Fraser, Anthony Meola, Raquel Guzman Feb 2023

Characterizing Particle Bed Stratigraphy As A Function Of Particle Size In An Airless, Microgravity Environment, Gillian Gomer, Michael Fraser, Anthony Meola, Raquel Guzman

The Pegasus Review: UCF Undergraduate Research Journal

Asteroids and other small planetary bodies are covered in a loose, dynamic layer of multi-sized dusty particles. We are focused on developing methods to further understand this surface regolith behavior to inform future landing missions on these small bodies for resource collection. The Strata-1 experiment was designed to study granular behavior in a passive, microgravity, airless environment. These conditions, simulating that of an asteroid’s surface, were attained by installing Strata-1 aboard the International Space Station for 347 days. In this experiment, we took images of red, green, and blue multi-sized glass shards within a tube to better understand their stratigraphy. …

Go to article

Relevancy Of Pulsed Electroacoustic Measurements For Investigating Spacecraft Charging, Zachary Gibson, J. R. Dennison Feb 2023

Relevancy Of Pulsed Electroacoustic Measurements For Investigating Spacecraft Charging, Zachary Gibson, J. R. Dennison

Journal Articles

The magnitude and spatial distribution of charge embedded in dielectric materials and the evolution of the charge distributions with time are paramount for the understanding and mitigation of spacecraft charging. Spacecraft materials are charged primarily by incident fluxes of low-energy electrons, with electron fluxes in the 10–50 keV range often responsible for the most deleterious arcing effects. While the pulsed electroacoustic (PEA) method can provide sensitive nondestructive measurements of the internal charge distribution in insulating materials, it has often been limited for spacecraft charging applications by typical spatial resolutions of ≤ 10 μm , with a 10- μm …

Go to article

High-Frequency Diode Effect In Superconducting Nb3Sn Microbridges, Sara Chahid, Serafim Teknowijoyo, Iris Mowgood, Armen Gulian Feb 2023

High-Frequency Diode Effect In Superconducting Nb3Sn Microbridges, Sara Chahid, Serafim Teknowijoyo, Iris Mowgood, Armen Gulian

Mathematics, Physics, and Computer Science Faculty Articles and Research

The superconducting diode effect has recently been reported in a variety of systems and different symmetry-breaking mechanisms have been examined. However, the frequency range of these potentially important devices still remains obscure. We investigated superconducting microbridges of Nb3Sn in out-of-plane magnetic fields; optimum magnetic fields of ∼10 mT generate ∼10% diode efficiency, while higher fields of ∼15–20 mT quench the effect. The diode changes its polarity with magnetic field reversal. We documented superconductive diode rectification at frequencies up to 100 kHz, the highest reported as of today. Interestingly, the bridge resistance during diode operation reaches a value that is a …

Go to article

Azimuthal Correlations In Z +Jets Events In Proton–Proton Collisions At √S = 13tev, Cms Collaboration Feb 2023

Azimuthal Correlations In Z +Jets Events In Proton–Proton Collisions At √S = 13tev, Cms Collaboration

Department of Physics and Astronomy: Faculty Publications

The production of Z bosons associated with jets is measured in pp collisions at √ s = 13 TeV with data recorded with the CMS experiment at the LHC corresponding to an integrated luminosity of 36.3 fb−1. The multiplicity of jets with transverse momentum pT > 30 GeV is measured for different regions of the Z boson’s pT(Z ), from lower than 10 GeV to higher than 100 GeV. The azimuthal correlation Δφ between the Z boson and the leading jet, as well as the correlations between the two leading jets are measured in three regions …

Go to article

Search For Rare Decays B+→D (*)+SΗ, D (*)+ SK̅, D+ Η, And D+ K0, M. Kumar, V. Bhardwaj, K. Lalwani, I. Adachi Feb 2023

Search For Rare Decays B+→D (*)+SΗ, D (*)+ SK̅, D+ Η, And D+ K0, M. Kumar, V. Bhardwaj, K. Lalwani, I. Adachi

Faculty Publications

We present a study of rare decay modes B+→D+Sh0, B+→D*+S h0, and B+→D+h0, where h0 denotes the neutral meson η or K0, using a data sample of (772±10)×106   BB̅ events produced at the Υ(4S) resonance. The data were collected by the Belle detector operating at the asymmetric-energy KEKB collider. We find no evidence for these decays, so we set upper limits at the 90% confidence level on the branching fractions of B+→D+ S h0, D*+ S h0, …

Go to article

Search For The Higgs Boson Decay To A Pair Of Electrons In Proton-Proton Collisions At √S = 13 Tev, A. Tumasyan Feb 2023

Search For The Higgs Boson Decay To A Pair Of Electrons In Proton-Proton Collisions At √S = 13 Tev, A. Tumasyan

Department of Physics and Astronomy: Faculty Publications

A search is presented for the Higgs boson decay to a pair of electrons (e+e−) in proton-proton collisions at √ s = 13 TeV. The data set was collected with the CMS experiment at the LHC between 2016 and 2018, corresponding to an integrated luminosity of 138 fb−1. The analysis uses event categories targeting Higgs boson production via gluon fusion and vector boson fusion. The observed upper limit on the Higgs boson branching fraction to an electron pair is 3.0 × 10−4 (3.0 × 10−4 expected) at the 95% confidence level, which …

Go to article

Three- And Four-Point Functions In Cpt -Even Lorentz-Violating Scalar Qed, Brett Altschul, L. C.T. Brito, J. C.C. Felipe, S. Karki, A. C. Lehum, A. Yu Petrov Feb 2023

Three- And Four-Point Functions In Cpt -Even Lorentz-Violating Scalar Qed, Brett Altschul, L. C.T. Brito, J. C.C. Felipe, S. Karki, A. C. Lehum, A. Yu Petrov

Faculty Publications

The renormalization of quantum field theories usually assumes Lorentz and gauge symmetries, besides the general restrictions imposed by unitarity and causality. However, the set of renormalizable theories can be enlarged by relaxing some of these assumptions. In this work, we consider the particular case of a CPT-preserving but Lorentz-breaking extension of scalar QED. For this theory, we calculate the one-loop radiative corrections to the three- and four-point scalar-vector vertex functions, at the lowest order in the Lorentz-violation parameters, and we explicitly verify that the resulting low-energy effective action is compatible with the usual gauge invariance requirements. With these results, we …

Go to article

Erratum: Measurement Of Prompt And Nonprompt Charmonium Suppression In Pbpb Collisions At 5.02 Tev, A. Tumasyan Feb 2023

Erratum: Measurement Of Prompt And Nonprompt Charmonium Suppression In Pbpb Collisions At 5.02 Tev, A. Tumasyan

Department of Physics and Astronomy: Faculty Publications

In Fig. 3, the y axis titles were mistakenly written showing a single-differential cross section in either dimuon pT or rapidity, when in fact the cross section is normalized by both the pT and rapidity ranges used for a given measurement point. The corrected version is shown in the new Fig. 3 provided below.

Go to article

Effects Of Intermixing And Oxygen Vacancies On A Two-Dimensional Electron Gas At The Polar (Tbsco3/Ktao) (001) Interface, Bhubnesh Lama, Evgeny Y. Tsymbal, Tula R. Paudel Feb 2023

Effects Of Intermixing And Oxygen Vacancies On A Two-Dimensional Electron Gas At The Polar (Tbsco3/Ktao) (001) Interface, Bhubnesh Lama, Evgeny Y. Tsymbal, Tula R. Paudel

Department of Physics and Astronomy: Faculty Publications

3d-5d perovskite oxides, ABO3 (where A and B are 3d or 5d elements), form polar surfaces in the (001)- stacked thin films. As a result, the polar-polar (001) interface between two ABO3 insulators could create polar discontinuity potentially producing a two-dimensional electron gas of higher density and stronger spatial localization compared to the widely studied polar-nonpolar oxide interfaces, such as (001) LaAlO3/SrTiO3. Here, as a model system, we explore the interface between polar (001) TbScO3 and polar (001) KTaO3 using first-principles density functional theory.We find that the …

Go to article

First Prev Next Last