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Articles 1  30 of 527
FullText Articles in Physics
Precision Measurement Of The BeamNormal SingleSpin Asymmetry In ForwardAngle Elastic ElectronProton Scattering, Qweak Collaboration, David Armstrong, Wouter Deconinck, K. Bartlett, J. C. Cornejo, R. D. Carlini, James F. Dowd, J. M. Finn, Valerie M. Gray, K. Grimm, J. R. Hoskins, J. P. Leckey, Jeong Han Lee, Joshua A. Magee, Victoria F. Owen
Precision Measurement Of The BeamNormal SingleSpin Asymmetry In ForwardAngle Elastic ElectronProton Scattering, Qweak Collaboration, David Armstrong, Wouter Deconinck, K. Bartlett, J. C. Cornejo, R. D. Carlini, James F. Dowd, J. M. Finn, Valerie M. Gray, K. Grimm, J. R. Hoskins, J. P. Leckey, Jeong Han Lee, Joshua A. Magee, Victoria F. Owen
Arts & Sciences Articles
A beamnormal singlespin asymmetry generated in the scattering of transversely polarized electrons from unpolarized nucleons is an observable related to the imaginary part of the twophoton exchange process. We report a 2% precision measurement of the beamnormal singlespin asymmetry in elastic electronproton scattering with a mean scattering angle of theta_lab = 7.9 degrees and a mean energy of 1.149 GeV. The asymmetry result is B_n = 5.194 + 0.067 (stat) + 0.082 (syst) ppm. This is the most precise measurement of this quantity available to date and therefore provides a stringent test of twophoton exchange models at farforward scattering ...
Physics 516: Electromagnetic Phenomena (Spring 2020), Philip C. Nelson
Physics 516: Electromagnetic Phenomena (Spring 2020), Philip C. Nelson
Department of Physics Papers
These course notes are made publicly available in the hope that they will be useful. All reports of errata will be gratefully received. I will also be glad to hear from anyone who reads them, whether or not you find errors: pcn@upenn.edu.
Consistency Checks For TwoBody FiniteVolume Matrix Elements. Ii. Perturbative Systems, Raúl A. Briceño, Maxwell T. Hansen, Andrew W. Jackura
Consistency Checks For TwoBody FiniteVolume Matrix Elements. Ii. Perturbative Systems, Raúl A. Briceño, Maxwell T. Hansen, Andrew W. Jackura
Physics Faculty Publications
Using the general formalism presented in [Phys. Rev. D 94, 013008 (2016); Phys. Rev. D 100, 034511 (2019)], we study the finitevolume effects for the 2 þ J → 2 matrix element of an external current coupled to a twoparticle state of identical scalars with perturbative interactions. Working in a finite cubic volume with periodicity L, we derive a 1=L expansion of the matrix element through O(1=L^{5}) and find that it is governed by two universal currentdependent parameters, the scalar charge and the threshold two particle form factor. We confirm the result through a numerical study of ...
Magnetic Forces In The Absence Of A Classical Magnetic Field, Ismael L. Paiva, Yakir Aharonov, Jeff Tollaksen, Mordecai Waegell
Magnetic Forces In The Absence Of A Classical Magnetic Field, Ismael L. Paiva, Yakir Aharonov, Jeff Tollaksen, Mordecai Waegell
Mathematics, Physics, and Computer Science Faculty Articles and Research
It is shown that, in some cases, the effect of discrete distributions of flux lines in quantum mechanics can be associated with the effect of continuous distributions of magnetic fields with special symmetries. In particular, flux lines with an arbitrary value of magnetic flux can be used to create energetic barriers, which can be used to confine quantum systems in specially designed configurations. This generalizes a previous work where such energy barriers arose from flux lines with halfinteger fluxons. Furthermore, it is shown how the Landau levels can be obtained from a twodimensional grid of flux lines. These results suggest ...
The Clas12 Software Framework And Event Reconstruction, V. Ziegler, N. A. Baltzell, F. Bossù, D. S. Carman, P. Chatanon, M. Contalbrigo, J. Newton, M. Ungaro
The Clas12 Software Framework And Event Reconstruction, V. Ziegler, N. A. Baltzell, F. Bossù, D. S. Carman, P. Chatanon, M. Contalbrigo, J. Newton, M. Ungaro
Physics Faculty Publications
We describe offline event reconstruction for the CEBAF Large Acceptance Spectrometer at 12 GeV (CLAS12), including an overview of the offline reconstruction framework and software tools, a description of the algorithms developed for the individual detector subsystems, and the overall approach for charged and neutral particle identification. We also present the scheme for data processing and the code management procedures.
Heavy Quark Expansion For HeavyLight LightCone Operators, Shuai Zhao
Heavy Quark Expansion For HeavyLight LightCone Operators, Shuai Zhao
Physics Faculty Publications
We generalize the celebrated heavy quark expansion to nonlocal QCD operators. By taking nonlocal heavylight current on the lightcone as an example, we confirm that the collinear singularities are common between QCD operator and the corresponding operator in heavy quark effective theory (HQET), at the leading power of 1/M expansion. Based on a perturbative calculation in operator form at oneloop level, a factorization formula linking QCD and HQET operators is investigated and the matching coefficient is determined. The matching between QCD and HQET lightcone distribution amplitudes (LCDAs) as well as other momentum distributions of hadron can be derived as ...
Truncations Of W (Infinity) Algebras, Mohammed Akram Fellah
Truncations Of W (Infinity) Algebras, Mohammed Akram Fellah
Department of Physics Faculty Publications
We introduce a new class of Vertex Operator Algebras Y+ and their duals, which generalize the standard Walgebras WN of type sl(N). These algebras can be defined in terms of junctions of boundary conditions and interfaces in the GLtwisted N = 4 Super Yang Mills gauge theory.
The aim of these technical calculations is to find the relation of these orthosymplectic Yalgebras to truncations of even W\infinity.
LongRange Electroweak Amplitudes Of Single Hadrons From Euclidean FiniteVolume Correlation Functions, Raúl A. Briceño, Zohreh Davoudi, Maxwell T. Hansen, Matthias R. Schindler, Alessandro Baroni
LongRange Electroweak Amplitudes Of Single Hadrons From Euclidean FiniteVolume Correlation Functions, Raúl A. Briceño, Zohreh Davoudi, Maxwell T. Hansen, Matthias R. Schindler, Alessandro Baroni
Physics Faculty Publications
A relation is presented between singlehadron longrange matrix elements defined in a finite Euclidean spacetime and the corresponding infinitevolume Minkowski amplitudes. This relation is valid in the kinematic region where any number of twohadron states can simultaneously go on shell, so that the effects of strongly coupled intermediate channels are included. These channels can consist of nonidentical particles with arbitrary intrinsic spins. The result accommodates general Lorentz structures as well as nonzero momentum transfer for the two external currents inserted between the singlehadron states. The formalism, therefore, generalizes the work by Christ et al. [Phys. Rev. D 91, 114510 (2015 ...
Measurement Of The SingleSpin Asymmetry A⁰ʸ In QuasiElastic ³He↑(E,E'N) Scattering At 0.4 < Q^{2} < 1.0 Gev/C^{2}, E. Long, Y.W. Zhang, M. Mihovilovic, M. Canan, S. Golge, L. Zhu
Measurement Of The SingleSpin Asymmetry A⁰ʸ In QuasiElastic ³He↑(E,E'N) Scattering At 0.4 2 2, E. Long, Y.W. Zhang, M. Mihovilovic, M. Canan, S. Golge, L. Zhu
Physics Faculty Publications
Due to the lack of free neutron targets, studies of the structure of the neutron are typically made by scattering electrons from either ²H or ³He targets. In order to extract useful neutron information from a ³He target, one must understand how the neutron in a ³He system differs from a free neutron by taking into account nuclear effects such as final state interactions and meson exchange currents. The target single spin asymmetry A⁰ʸ is an ideal probe of such effects, as any deviation from zero indicates effects beyond plane wave impulse approximation. New measurements of the target single spin ...
Quasielastic Lepton Scattering And BackToBack Nucleons In The ShortTime Approximation, S. Pastore, J. Carlson, S. Gandolfi, R. Schiavilla, R. B. Wiringa
Quasielastic Lepton Scattering And BackToBack Nucleons In The ShortTime Approximation, S. Pastore, J. Carlson, S. Gandolfi, R. Schiavilla, R. B. Wiringa
Physics Faculty Publications
Understanding quasielastic electron and neutrino scattering from nuclei has taken on new urgency with current and planned neutrino oscillation experiments, and with electron scattering experiments measuring specific final states, such as those involving nucleon pairs in "backtoback" configurations. Accurate manybody methods are available for calculating the response of light (A <= 12) nuclei to electromagnetic and weak probes, but they are computationally intensive and only applicable to the inclusive response. In the present work we introduce a novel approach, based on realistic models of nuclear interactions and currents, to evaluate the shorttime (highenergy) inclusive and exclusive response of nuclei. The approach accounts reliably for crucial twonucleon dynamics, including correlations and currents, and provides information on backtoback nucleons observed in electron and neutrino scattering experiments. We demonstrate that in the quasielastic regime and at moderate momentum transfers both initial and finalstate correlations and twonucleon currents are important for a quantitatively successful description of the inclusive response and finalstate nucleons. Finally, the approach can be extended to include relativistickinematical and dynamicaleffects, at least approximately in the twonucleon sector, and to describe the response in the resonanceexcitation region.
Gluon PseudoDistributions At Short Distances: Forward Case, Ian Balitsky, Wayne Morris, Anatoly Radyushkin
Gluon PseudoDistributions At Short Distances: Forward Case, Ian Balitsky, Wayne Morris, Anatoly Radyushkin
Physics Faculty Publications
We present the results that are necessary in the ongoing lattice calculations of the gluon parton distribution functions (PDFs) within the pseudoPDF approach. We give a classification of possible twogluon correlator functions and identify those that contain the invariant amplitude determining the gluon PDF in the lightcone z^{2 }→ 0 limit. Oneloop calculations have been performed in the coordinate representation and in an explicitly gaugeinvariant form. We made an effort to separate ultraviolet (UV) and infrared (IR) sources of the ln(−z^{2})dependence at short distances z^{2}. The UV terms cancel in the reduced Ioffetime distribution (ITD), and ...
Developing A High Resolution Zdc For The Eic, J. H. Lee, T. Sako, K. Tanida, M. Murray, Q. Wang, N. Nickel, Y. Yamazaki, Y. Itow, H. Menjo, T. Shibata, C. E. Hyde, V. Baturin, Y. Goto, I. Nakagawa, R. Seidl, K. Kawade, A. Deshpande, B. Schmookler, K. Nakano, T. Chujo, Y. Miyachi
Developing A High Resolution Zdc For The Eic, J. H. Lee, T. Sako, K. Tanida, M. Murray, Q. Wang, N. Nickel, Y. Yamazaki, Y. Itow, H. Menjo, T. Shibata, C. E. Hyde, V. Baturin, Y. Goto, I. Nakagawa, R. Seidl, K. Kawade, A. Deshpande, B. Schmookler, K. Nakano, T. Chujo, Y. Miyachi
Physics Faculty Publications
The Electron Ion Collider offers the opportunity to make unparalleled multidimen sional measurements of the spin structure of the proton and nuclei, as well as a study of the onset of partonic saturation at small Bjorkenx [1]. An important requirement of the physics program is the tagging of spectator neutrons and the identification of forward photons. We propose to design and build a Zero Degree Calorimeter, or ZDC, to measure photons and neutrons with excellent energy & position resolution.
Klf Analysis Report: Meson Spectroscopy Simulation Studies, Shankar Adhikari, Moskov Amaryan
Klf Analysis Report: Meson Spectroscopy Simulation Studies, Shankar Adhikari, Moskov Amaryan
Physics Faculty Publications
This analysis report is written as a supplemental for the strange meson spectroscopy part of the KLF proposal submitted to the JLab PAC48.
Measurement Of The Production Cross Section Of Four Top Quarks In ProtonProton Collisions At 13 Tev, Caleb Fangmeier
Measurement Of The Production Cross Section Of Four Top Quarks In ProtonProton Collisions At 13 Tev, Caleb Fangmeier
Theses, Dissertations, and Student Research: Department of Physics and Astronomy
The field of particle physics involves not only searches for new particles and measurements of their interactions, but also the design and construction of advanced particle detectors. This thesis presents the measurement of the production cross section of four top quarks in protonproton collisions at a centerofmass energy of 13 TeV using 137 fb$^{1}$ of integrated luminosity recorded by the CMS experiment at the LHC. This analysis considers events in the final state of a samesign pair of leptons, notable for being a final state with relatively few Standard Model background events. A boosted decision tree is utilized to ...
Consistency Checks For TwoBody FiniteVolume Matrix Elements: Conserved Currents And Bound States, Raúl A. Briceño, Maxwell T. Hansen, Andrew W. Jackura
Consistency Checks For TwoBody FiniteVolume Matrix Elements: Conserved Currents And Bound States, Raúl A. Briceño, Maxwell T. Hansen, Andrew W. Jackura
Physics Faculty Publications
Recently, a framework has been developed to study form factors of twohadron states probed by an external current. The method is based on relating finitevolume matrix elements, computed using numerical lattice QCD, to the corresponding infinitevolume observables. As the formalism is complicated, it is important to provide nontrivial checks on the final results and also to explore limiting cases in which more straightforward predictions may be extracted. In this work we provide examples on both fronts. First, we show that, in the case of a conserved vector current, the formalism ensures that the finitevolume matrix element of the conserved charge ...
Pion Valence Structure From IoffeTime Parton Pseudodistribution Functions, Bálint Joó, Joseph Karpie, Kostas Orinos, Anatoly V. Radyushkin, David G. Richards, Raza Sabbir Sufian, Savvas Zafeiropoulos
Pion Valence Structure From IoffeTime Parton Pseudodistribution Functions, Bálint Joó, Joseph Karpie, Kostas Orinos, Anatoly V. Radyushkin, David G. Richards, Raza Sabbir Sufian, Savvas Zafeiropoulos
Physics Faculty Publications
We present a calculation of the pion valence quark distribution extracted using the formalism of reduced Ioffetime pseudodistributions or more commonly known as pseudoPDFs. Our calculation is carried out on two different 2 + 1 flavor QCD ensembles using the isotropicclover fermion action, with lattice dimensions 24^{3} × 64 and 32^{3} × 96 at the lattice spacing of a = 0.127 fm, and with the quark mass equivalent to a pion mass of m_{π} ≃ 415 MeV. We incorporate several combinations of smearedpoint and smearedsmeared pion sourcesink interpolation fields in obtaining the lattice QCD matrix elements using the summation method. After ...
Longitudinal Bunch Profile Diagnostic For Magnetized Electron Beams, Mark Stefani, Fay Hannon
Longitudinal Bunch Profile Diagnostic For Magnetized Electron Beams, Mark Stefani, Fay Hannon
Electrical & Computer Engineering Faculty Publications
The study of magnetized electron beam has become a high priority for its use in ion beam cooling as part of electron ion colliders and the potential of easily forming flat beams with a large aspect ratio. In this paper, a new diagnostic is described with the purpose of studying longitudinal and transverse magnetized beam properties. The device is a modification to a typical pepperpot. Specifically, this 1D pepperpot was designed for use with a transverse deflecting cavity for longitudinal bunch profile measurements of magnetized beams.
Numerical Exploration Of Three Relativistic Particles In A Finite Volume Including TwoParticle Resonances And Bound States, Fernando RomeroLópez, Stephen R. Sharpe, Tyler D. Blanton, Raúl A. Briceño, Maxwell T. Hansen
Numerical Exploration Of Three Relativistic Particles In A Finite Volume Including TwoParticle Resonances And Bound States, Fernando RomeroLópez, Stephen R. Sharpe, Tyler D. Blanton, Raúl A. Briceño, Maxwell T. Hansen
Physics Faculty Publications
In this work, we use an extension of the quantization condition, given in ref. [1], to numerically explore the finitevolume spectrum of three relativistic particles, in the case that twoparticle subsets are either resonant or bound. The original form of the relativistic threeparticle quantization condition was derived under a technical assumption on the twoparticle K matrix that required the absence of twoparticle bound states or narrow twoparticle resonances. Here we describe how this restriction can be lifted in a simple way using the freedom in the definition of the Kmatrixlike quantity that enters the quantization condition. With this in hand ...
Comparing Proton Momentum Distributions In A = 2 And 3 Nuclei Via ^{2}H ^{3}H And ^{3}He (E,E′P) Measurements, R. CruzTorres, F. Hauenstein, A. Schmidt, D. Nguyen, D. Abrams, H. Albataineh, S. Alsalmi, D. Androic, K. Aniol, W. Armstrong, J. Arrington, H. Atac, D. Bulumulla, C. E. Hyde, V. Khachatryan, M. N.H. Rashad, L. B. Weinstein, Z. Y. Ye, J. Zhang, Jefferson Lab Hall A Tritium Collaboration
Comparing Proton Momentum Distributions In A = 2 And 3 Nuclei Via 2H 3H And 3He (E,E′P) Measurements, R. CruzTorres, F. Hauenstein, A. Schmidt, D. Nguyen, D. Abrams, H. Albataineh, S. Alsalmi, D. Androic, K. Aniol, W. Armstrong, J. Arrington, H. Atac, D. Bulumulla, C. E. Hyde, V. Khachatryan, M. N.H. Rashad, L. B. Weinstein, Z. Y. Ye, J. Zhang, Jefferson Lab Hall A Tritium Collaboration
Physics Faculty Publications
We report the first measurement of the (e, e' p) reaction crosssection ratios for Helium3 (^{3}He), Tritium (^{3}H), and Deuterium (d). The measurement covered a missing momentum range of 40 ≤ p_{miss} ≤ 550 MeV/c, at large momentum transfer ({Q^{2}} ≈ 1.9 (GeV/c)^{2}) and x_{B} > 1, which minimized contributions from non quasielastic (QE) reaction mechanisms. The data is compared with planewave impulse approximation (PWIA) calculations using realistic spectral functions and momentum distributions. The measured and PWIAcalculated crosssection ratios for ^{3}He/d and ^{3}H/d extend to just above the typical nucleon Fermimomentum ...
Transverse Uncorrelated Emittance Diagnostic For Magnetized Electron Beams, Fay Hannon, Mark Stefani
Transverse Uncorrelated Emittance Diagnostic For Magnetized Electron Beams, Fay Hannon, Mark Stefani
Electrical & Computer Engineering Faculty Publications
The study of magnetized electron beam has become a high priority for its use in ion beam cooling as part of electron ion colliders and the potential of easily forming flat beams for various applications. In this paper, a purposespecific diagnostic is described with the intention of studying transverse magnetized beam properties. The device is a modification to the classic pepperpot, used in this context to measure the uncorrelated components of transverse emittance in addition to the typical effective emittance. The limitations of traditional methods are discussed, and simulated demonstrations of the new technique shown.
Complete Matching For Quasidistribution Functions In Large Momentum Effective Theory, Wei Wang, JianHui Zhang, Shuai Zhao, Ruilin Zhu
Complete Matching For Quasidistribution Functions In Large Momentum Effective Theory, Wei Wang, JianHui Zhang, Shuai Zhao, Ruilin Zhu
Physics Faculty Publications
We complete the procedure of extracting parton distribution functions (PDFs) using large momentum effective theory at leading power accuracy in the hadron momentum. We derive a general factorization formula for the quasiPDFs in the presence of mixing and give the corresponding hard matching kernel at O(α_{s}), both for the unpolarized and for the polarized quark and gluon quasiPDFs. Our calculation is performed in a regularizationindependent momentum subtraction scheme. The results allow us to match the nonperturbatively renormalized quasiPDFs to normal PDFs in the presence of mixing and therefore can be used to extract flavorsinglet quark PDFs as well ...
Obituary: Anthony Starace (19452019)
Obituary: Anthony Starace (19452019)
Anthony F. Starace Publications
Anthony Starace, George Holmes University Professor of physics, died Sept. 5 from complications related to pancreatitis. He was 74.
Starace was born July 24, 1945, in the Queens borough of New York City. He graduated from Stuyvesant High School and earned his bachelor’s degree from Columbia University in 1966 before moving west to the University of Chicago, where he earned his doctorate under adviser Ugo Fano in 1971. It was in Chicago that he met Katherine Fritz of Beatrice, Nebraska, his wife of 51 years.
Following a postdoctoral appointment at Imperial College London, Starace moved to Lincoln as an ...
Unitarity Of The InfiniteVolume ThreeParticle Scattering Amplitude Arising From A FiniteVolume Formalism, Raúl A. Briceño, Maxwell T. Hansen, Stephen R. Sharpe, Adam P. Szczepaniak
Unitarity Of The InfiniteVolume ThreeParticle Scattering Amplitude Arising From A FiniteVolume Formalism, Raúl A. Briceño, Maxwell T. Hansen, Stephen R. Sharpe, Adam P. Szczepaniak
Physics Faculty Publications
Hansen and Sharpe [Phys. Rev. D 92, 114509 (2015)] derived a relation between the scattering amplitude of three identical bosons,M_{3}, and a real function referred to as the divergencefree K matrix and denoted K_{df;3}. The result arose in the context of a relation between finitevolume energies and K_{df;3}, derived to all orders in the perturbative expansion of a generic lowenergy effective field theory. In this work we set aside the role of the finite volume and focus on the infinitevolume relation between K_{df;3} and M_{3}. We show that, for any real ...
Yields Of Weakly Bound Light Nuclei As A Probe Of The Statistical Hadronization Model, Yiming Cai, Thomas D. Cohen, Boris A. Gelman, Yukari Yamauchi
Yields Of Weakly Bound Light Nuclei As A Probe Of The Statistical Hadronization Model, Yiming Cai, Thomas D. Cohen, Boris A. Gelman, Yukari Yamauchi
Publications and Research
The statistical hadronization model successfully describes the yields of hadrons and light nuclei from central heavyion collisions over a wide range of energies. It is a simple and efficient phenomenological framework in which the relative yields for very high energy collisions are essentially determined by a single model parameter—the chemical freezeout temperature. Recent measurements of yields of hadrons and light nuclei covering over nine orders of magnitudes from the ALICE collaboration at the Large Hadron Collider were described by the model with remarkable accuracy with a chemical freezeout temperature of 156.5 ± 1.5 MeV. A key physical question ...
Search For Resonant Double Higgs Production With Bbzz Decays In The Bbℓℓνν Final State In Pp Collisions At √S = 13 Tev, Rami Kamalieddin
Search For Resonant Double Higgs Production With Bbzz Decays In The Bbℓℓνν Final State In Pp Collisions At √S = 13 Tev, Rami Kamalieddin
Theses, Dissertations, and Student Research: Department of Physics and Astronomy
Since the discovery of the Higgs boson in 2012 by the ATLAS and CMS experiments, most of the quantum mechanical properties that describe the longawaited Higgs boson have been measured. Due to the outstanding work of the LHC, over a hundred of fb^{−1} of proton collisions data have been delivered to both experiments. Finally, it became sensible for analyses teams to start working with a very low cross section processes involving the Higgs boson, e.g., a recent success in observing ttH and VHbb processes. One of the main remaining untouched topics is a double Higgs boson production. However ...
Dual Superconformal Symmetry Of N = 2 ChernSimons Theory With Fundamental Matter At Large N, Karthik Inbasekar, Sachin Jain, Sucheta Majumdar, Pranjal Nayak, Turmoli Neogi, Ritam Sinha, Tarun Sharma, V. Umesh
Dual Superconformal Symmetry Of N = 2 ChernSimons Theory With Fundamental Matter At Large N, Karthik Inbasekar, Sachin Jain, Sucheta Majumdar, Pranjal Nayak, Turmoli Neogi, Ritam Sinha, Tarun Sharma, V. Umesh
Physics and Astronomy Faculty Publications
Dual conformal symmetry and Yangian symmetry are symmetries of amplitudes that have aided the study of scattering amplitudes in highly supersymmetric theories like N = 4 SYM and ABJM. However, in general such symmetries are absent from the theories with lesser or no supersymmetry. In this paper, we show that the tree level 2 → 2 scattering amplitude in the 3d N = 2 ChernSimons theory coupled to a fundamental chiral multiplet is dual superconformal invariant. In the ’t Hooft large N limit, the 2 → 2 scattering amplitude in this theory has been shown to be treelevel exact in nonanyonic channels, while having ...
Factorization Of Jet Cross Sections In HeavyIon Collisions, JianWei Qiu, Felix Ringer, Nobuo Sato, Pia Zurita
Factorization Of Jet Cross Sections In HeavyIon Collisions, JianWei Qiu, Felix Ringer, Nobuo Sato, Pia Zurita
Physics Faculty Publications
We propose a new phenomenological approach to establish QCD factorization of jet cross sections in the heavyion environment. Starting from a factorization formalism in protonproton collisions, we introduce medium modified jet functions to capture the leading interaction of jets with the hot and dense QCD medium. A global analysis using a Monte Carlo sampling approach is performed in order to reliably determine the new jet functions from the nuclear modification factor of inclusive jets at the LHC. We find that gluon jets are significantly more suppressed due to the presence of the medium than quark jets. In addition, we observe ...
Performance Of Plastic Electron Optics Components Fabricated Using A 3d Printer, Phillip Wiebe, Peter Beierle, HuaChieh Shao, Bret Gergely, Anthony F. Starace, Herman Batelaan
Performance Of Plastic Electron Optics Components Fabricated Using A 3d Printer, Phillip Wiebe, Peter Beierle, HuaChieh Shao, Bret Gergely, Anthony F. Starace, Herman Batelaan
Anthony F. Starace Publications
We show images produced by an electron beam deflector, a quadrupole lens and a einzel lens fabricated from conducting and nonconducting plastic using a 3D printer. Despite the difficulties associated with the use of plastics in vacuum, such as outgassing, poor conductivity, and print defects, the devices were used successfully in vacuum to steer, stretch and focus electron beams to millimeter diameters. Simulations indicate that much smaller focus spot sizes might be possible for such 3Dprinted plastic electron lenses taking into account some possible surface defects. This work was motivated by our need to place electron optical components in difficulttoaccess ...
Slow Light With Interleaved PN Junction To Enhance Performance Of Integrated MachZehnder Silicon Modulators, Marco Passoni, Dario Gerace, Liam O'Faolain, Lucio Claudio Andreani
Slow Light With Interleaved PN Junction To Enhance Performance Of Integrated MachZehnder Silicon Modulators, Marco Passoni, Dario Gerace, Liam O'Faolain, Lucio Claudio Andreani
Cappa Publications
Slow light is a very important concept in nanophotonics, especially in the context of photonic crystals. In this work, we apply our previous design of bandedge slow light in silicon waveguide gratings [M. Passoni et al, Opt. Express 26, 8470 (2018)] to MachZehnder modulators based on the plasma dispersion effect. The key idea is to employ an interleaved pn junction with the same periodicity as the grating, in order to achieve optimal matching between the electromagnetic field profile and the depletion regions of the pn junction. The resulting modulation efficiency is strongly improved as compared to common modulators based on ...
Analytic Generalized Description Of A Perturbative Nonparaxial Elegant LaguerreGaussian Phasor For Ultrashort Pulses In The Time Domain, Andrew Vikartofsky, Ethan C. Jahns, Anthony F. Starace
Analytic Generalized Description Of A Perturbative Nonparaxial Elegant LaguerreGaussian Phasor For Ultrashort Pulses In The Time Domain, Andrew Vikartofsky, Ethan C. Jahns, Anthony F. Starace
Anthony F. Starace Publications
An analytic expression for a polychromatic phasor representing an arbitrarily short elegant LaguerreGauss (eLG) laser pulse of any spot size and LG mode is presented in the time domain as a nonrecursive, closedform perturbative expansion valid to any order of perturbative correction. This phasor enables the calculation of the complex electromagnetic fields for such beams without requiring the evaluation of any Fourier integrals. It is thus straightforward to implement in analytical or numerical applications involving eLG pulses.