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FullText Articles in Physics
MultiMetallic Conduction Cooled Superconducting RadioFrequency Cavity With High Thermal Stability, Gianluigi Ciovati, Gary Cheng, Uttar Pudasaini, Robert A. Rimmer
MultiMetallic Conduction Cooled Superconducting RadioFrequency Cavity With High Thermal Stability, Gianluigi Ciovati, Gary Cheng, Uttar Pudasaini, Robert A. Rimmer
Physics Faculty Publications
Superconducting radiofrequency cavities are commonly used in modern particle accelerators for applied and fundamental research. Such cavities are typically made of highpurity, bulk Nb and with cooling by a liquid helium bath at a temperature of ∼2 K. The size, cost and complexity of operating a particle accelerator with a liquid helium refrigerator make the current cavity technology not favorable for use in industrialtype accelerators. We have developed a multimetallic 1.495 GHz elliptical cavity conductively cooled by a cryocooler. The cavity has a ∼2 μm thick layer of Nb_{3}Sn on the inner surface, exposed to the rf ...
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 ...
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 ...
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.
Question 1: Car Flip; Question 2: A Mole Of People, Larry Weinstein
Question 1: Car Flip; Question 2: A Mole Of People, Larry Weinstein
Physics Faculty Publications
Consider mass, area, power, and food requirements. For more Fermi questions and answers, see Guesstimation 2.0: Solving Today's Problems on the Back of a Napkin, by Lawrence Weinstein (Princeton University Press, 2012). [Extracted from artcle]
Solutions For Fermi Questions, January 2020: Question 1: Car Flip; Question 2: A Mole Of People, Larry Weinstein
Solutions For Fermi Questions, January 2020: Question 1: Car Flip; Question 2: A Mole Of People, Larry Weinstein
Physics Faculty Publications
At what speed will a car flip over when it slides sideways into a curb? The angular momentum of the car will depend on its initial speed, the height of the curb, and the height of the centerofmass (CM) of the car. If we approximate the car as having all its mass located at its CM, then its initial angular momentum relative to the top of the curb is. [Extracted from the article]
Question 1: Plowing Snow; Question 2: Wasted Food, Larry Weinstein
Question 1: Plowing Snow; Question 2: Wasted Food, Larry Weinstein
Physics Faculty Publications
[Extracted from the article] How much snow is shoveled or plowed in the U.S. in a typical winter? How much food is wasted at school cafeterias every year in the U.S.? For more Fermi questions and answers, see Guesstimation 2.0: Solving Today's Problems on the Back of a Napkin, by Lawrence Weinstein (Princeton University Press, 2012).
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 ...
OpticalDepth Scaling Of Light Scattering From A Dense And Cold Atomic ^{87}Rb Gas, K. J. Kemp, S. J. Roof, M. D. Havey, I. M. Sokolov, D. V. Kupriyanov, W. Guerin
OpticalDepth Scaling Of Light Scattering From A Dense And Cold Atomic 87Rb Gas, K. J. Kemp, S. J. Roof, M. D. Havey, I. M. Sokolov, D. V. Kupriyanov, W. Guerin
Physics Faculty Publications
We report investigation of nearresonance light scattering from a cold and dense atomic gas of ^{87}Rb atoms. Measurements are made for probe frequencies tuned near the F=2→ F'=3 nearly closed hyperfine transition, with particular attention paid to the dependence of the scattered light intensity on detuning from resonance, the number of atoms in the sample, and atomic sample size. We find that, over a wide range of experimental variables, the optical depth of the atomic sample serves as an effective single scaling parameter which describes well all the experimental data.
Electron Tunneling And XRay Photoelectron Spectoscopy Studies Of The Superconductiong Properties Of NitrogenDoped Niobium Resonator Cavities, Eric M. Lechner, Basu Dev Oli, Junki Makita, Gianluigi Ciovati, Alex Gurevich, Maria Iavarone
Electron Tunneling And XRay Photoelectron Spectoscopy Studies Of The Superconductiong Properties Of NitrogenDoped Niobium Resonator Cavities, Eric M. Lechner, Basu Dev Oli, Junki Makita, Gianluigi Ciovati, Alex Gurevich, Maria Iavarone
Physics Faculty Publications
We use scanning tunneling microscopy (STM) and spectroscopy (STS), and xray photoelectron spectroscopy (XPS) to investigate the effect of nitrogen doping on the surface electronic and chemical structures of cutouts from superconducting Nb radiofrequency cavities. The goal of this work is to get insights into the fundamental physics and materials mechanisms behind the striking decrease of the surface resistance with the radiofrequency magnetic field, which has been observed on Ndoped Nb cavities. Our XPS measurements reveal significantly more oxidized Nb 3d states and a thinner metallic suboxide layer on the Ndoped Nb surfaces, which is also confirmed by tunneling spectroscopy ...
Nonlinear Dynamics And Dissipation Of A Curvilinear Vortex Driven By A Strong TimeDependent Meissner Current, W.P.M.R. Pathirana, A. Gurevich
Nonlinear Dynamics And Dissipation Of A Curvilinear Vortex Driven By A Strong TimeDependent Meissner Current, W.P.M.R. Pathirana, A. Gurevich
Physics Faculty Publications
We report numerical simulations of largeamplitude oscillations of a trapped vortex line under a strong ac magnetic field H(t)=H sinωt parallel to the surface. The power dissipated by an oscillating vortex segment driven by the surface ac Meissner currents was calculated by taking into account the nonlinear vortex line tension, vortex mass, and a nonlinear LarkinOvchinnikov (LO) viscous drag coefficient η(v). We show that the LO decrease of η(v) with the vortex velocity v can radically change the field dependence of the surface resistance R_{i}(H) caused by trapped vortices. At low frequencies, R_{i ...}
Collision Of Li^{2+} With Li(2s) And Li(2p): Differential And Total Ionization; Discrete Excitations; Elastic Scattering, And Total Cross Section, H.R.J. Walters, Colm T. Whelan
Collision Of Li2+ With Li(2s) And Li(2p): Differential And Total Ionization; Discrete Excitations; Elastic Scattering, And Total Cross Section, H.R.J. Walters, Colm T. Whelan
Physics Faculty Publications
The coupled pseudostate approximation (McGovernet al2009Phys. Rev. A79042707) has been applied to Li^{2+} + Li(2s, 2p_{0,}±_{1}) collisions at 16 MeV with emphasis on studying the fully differential ionization measurements of GhanbariAdivi et al in the azimuthal plane (2017 J. Phys. B: At. Mol. Opt. Phys. 50 215202). The states of the valence electron in the Li target are calculated using the model potential of Stein (1993 J. Phys. B: At. Mol. Opt. Phys. 262087). Altogether 164 states with angular momental= 0 to 9 are employed in the scattering calculation. It is assumed that the electron in the ...
Neutron Valence Structure From Nuclear Deep Inelastic Scattering, E. P. Segarra, A. Schmidt, T. Kutz, D. W. Higinbotham, E. Piasetzky, M. Strikman, L. B. Weinstein, O. Hen
Neutron Valence Structure From Nuclear Deep Inelastic Scattering, E. P. Segarra, A. Schmidt, T. Kutz, D. W. Higinbotham, E. Piasetzky, M. Strikman, L. B. Weinstein, O. Hen
Physics Faculty Publications
Mechanisms of spinflavor SU(6) symmetry breaking in quantum chromodynamics (QCD) are studied via an extraction of the free neutron structure function from a global analysis of deep inelastic scattering (DIS) data on the proton and on nuclei from A = 2 (deuterium) to 208 (lead). Modification of the structure function of nucleons bound in atomic nuclei (known as the EMC effect) are consistently accounted for within the framework of a universal modification of nucleons in shortrange correlated (SRC) pairs. Our extracted neutrontoproton structure function ratio F^{n}_{2}/F^{p}_{2} becomes constant for x_{B }≥ 0.6, equaling 0 ...
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.
Probing FewBody Nuclear Dynamics Via ³H And ³He (E E'P) Pn CrossSection Measurements, R. CruzTorres, F. Hauenstein, D. Bulumulla, C. Hyde, M. Khachatryan, M.N.H. Rashad, L.B. Weinstein, Et. Al., Jefferson Lab Hall A. Tritium Collaboration
Probing FewBody Nuclear Dynamics Via ³H And ³He (E E'P) Pn CrossSection Measurements, R. CruzTorres, F. Hauenstein, D. Bulumulla, C. Hyde, M. Khachatryan, M.N.H. Rashad, L.B. Weinstein, Et. Al., Jefferson Lab Hall A. Tritium Collaboration
Physics Faculty Publications
We report the first measurement of the (e, e'p) threebody breakup reaction cross sections in helium3 (^{3}He) and tritium (^{3}H) at large momentum transfer [< Q^{2}> ≈ 1.9 (GeV/c)^{2}] and x_{B}> 1 kinematics, where the cross section should be sensitive to quasielastic (QE) scattering from single nucleons. The data cover missing momenta 40 ≤ p_{miss} ≤ 500 MeV/c that, in the QE limit with no rescattering, equals the initial momentum of the probed nucleon. The measured cross sections are compared with stateoftheart ab initio calculations. Overall good agreement, within ± 20%, is observed between data and ...
Intrinsic Transverse Momentum And Evolution In Weighted Spin Asymmetries, JianWei Qiu, Ted C. Rogers, Bowen Wang
Intrinsic Transverse Momentum And Evolution In Weighted Spin Asymmetries, JianWei Qiu, Ted C. Rogers, Bowen Wang
Physics Faculty Publications
The transverse momentumdependent (TMD) and collinear higher twist theoretical factorization frameworks are the most frequently used approaches to describe spindependent hard cross sections weighted by and integrated over transverse momentum. Of particular interest is the contribution from small transverse momentum associated with the target bound state. In phenomenological applications, this contribution is often investigated using transverse momentum weighted integrals that sharply regulate the large transverse momentum contribution, for example, with Gaussian parametrizations. Since the result is a kind of hybrid of TMD and collinear (inclusive) treatments, it is important to establish if and how the formalisms are related in applications ...
Observation Of InPlane Magnetic Field Induced Phase Transitions In Fese, Jong Mok Ok, Chang Il Kwon, Yoshimitsu Kohama, Jung Sang You, Sun Kyu Park, JiHye Kim, Y.J. Jo, E.S. Choi, Koichi Kindo, Woun Kang, KiSeok Kim, E. G. Moon, Alex Gurevich, Jun Sung Kim
Observation Of InPlane Magnetic Field Induced Phase Transitions In Fese, Jong Mok Ok, Chang Il Kwon, Yoshimitsu Kohama, Jung Sang You, Sun Kyu Park, JiHye Kim, Y.J. Jo, E.S. Choi, Koichi Kindo, Woun Kang, KiSeok Kim, E. G. Moon, Alex Gurevich, Jun Sung Kim
Physics Faculty Publications
We investigate thermodynamic properties of FeSe under inplane magnetic fields using torque magnetometry, specific heat, and magnetocaloric measurements. Below the upper critical field H_{c2}, we observed the field induced anomalies at H_{1} ∼ 15 T and H_{2 }∼ 22 T near H ∥ ab and below a characteristic temperature T* ∼ 2 K. The transition magnetic fields H_{1} and H_{2} exhibit negligible dependence on both temperature and field orientation. This contrasts to the strong temperature and angle dependence of H_{c2}, suggesting that these anomalies are attributed to the field induced phase transitions, originating from the inherent spindensitywave instability ...
BMeson LightCone Distribution Amplitude From Euclidean Quantities, Wei Wang, YuMing Wang, Ji Xu, Shuai Zhao
BMeson LightCone Distribution Amplitude From Euclidean Quantities, Wei Wang, YuMing Wang, Ji Xu, Shuai Zhao
Physics Faculty Publications
A new method for the modelindependent determination of the lightcone distribution amplitude of the Bmeson in heavy quark effective theory (HQET) is proposed by combining the large momentum effective theory and the numerical simulation technique on the Euclidean lattice. We demonstrate the autonomous scale dependence of the nonlocal quasiHQET operator with the aid of the auxiliary field approach, and further determine the perturbative matching coefficient entering the hardcollinear factorization formula for the Bmeson quasidistribution amplitude at the oneloop accuracy. These results will be crucial to explore the partonic structure of heavyquark hadrons in the static limit and to ...
Parton Distribution Functions From Loffe Time PseudoDistributions, Bálint Joó, Joseph Karpie, Kostas Orginos, Anatoly V. Radyushkin, David Richards, Savvas Zafeiropoulos
Parton Distribution Functions From Loffe Time PseudoDistributions, Bálint Joó, Joseph Karpie, Kostas Orginos, Anatoly V. Radyushkin, David Richards, Savvas Zafeiropoulos
Physics Faculty Publications
In this paper, we present a detailed study of the unpolarized nucleon parton distribution function (PDF) employing the approach of parton pseudodistribution functions. We perform a systematic analysis using three lattice ensembles at two volumes, with lattice spacings a = 0.127 fm and a = 0.094 fm, for a pion mass of roughly 400 MeV. With two lattice spacings and two volumes, both continuum limit and infinite volume extrapolation systematic errors of the PDF are considered. In addition to the x dependence of the PDF, we compute their first two moments and compare them with the pertinent phenomenological determinations.
Question 1: Electric Cars; Question 2: Chicken Poop, Larry Weinstein
Question 1: Electric Cars; Question 2: Chicken Poop, Larry Weinstein
Physics Faculty Publications
How much more electrical energy will the United States need to generate if everyone drives electric cars? How much chicken excrement is produced in the United States every year?. [Extracted from the article]
Solutions For Fermi Questions, December 2019: Question 1: Electric Cars; Question 2: Chicken Poop, Larry Weinstein
Solutions For Fermi Questions, December 2019: Question 1: Electric Cars; Question 2: Chicken Poop, Larry Weinstein
Physics Faculty Publications
How much more electrical energy will the United States need to generate if everyone drives electric cars? B I Answer: i b If we all switch from gasolinefueled to electricityfueled cars, then we will need to generate more electrical energy. Thus, if we replace all of our gasolinefueled cars with electricityfueled cars, we will need to generate about 30% more electrical energy. [Extracted from the article]
Beam Asymmetry Σ For The Photoproduction Of Η And Ή Mesons At Eγ = 8.8gev, S. Adhikari, A. Ali, M. J. Amaryan, A. Austregesilo, F. Barbosa, J. Barlow, A. Barnes, E. Barriga, R. Barsotti, T. D. Beattie, V. V. Berdnikov, T. Black, N. Wickramaarachchi, B. Zihlmann, The Gluex Collaboration
Beam Asymmetry Σ For The Photoproduction Of Η And Ή Mesons At Eγ = 8.8gev, S. Adhikari, A. Ali, M. J. Amaryan, A. Austregesilo, F. Barbosa, J. Barlow, A. Barnes, E. Barriga, R. Barsotti, T. D. Beattie, V. V. Berdnikov, T. Black, N. Wickramaarachchi, B. Zihlmann, The Gluex Collaboration
Physics Faculty Publications
We report on the measurement of the beam asymmetry Σ for the reactions →γp→pη and →γp→pη′ from the GlueX experiment using an 8.2–8.8GeV linearly polarized tagged photon beam incident on a liquid hydrogen target in Hall D at Jefferson Laboratory. These measurements are made as a function of momentum transfer −t with significantly higher statistical precision than our earlier η measurements and are the first measurements of η′ in this energy range. We compare the results to theoretical predictions based on tchannel quasiparticle exchange. We also compare the ratio of Σ_{η} to Σ_{η ...}
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 ...
Generalized Parton Distributions And Pseudodistributions, Anatoly V. Radyushkin
Generalized Parton Distributions And Pseudodistributions, Anatoly V. Radyushkin
Physics Faculty Publications
We derive oneloop matching relations for the Ioffetime distributions (ITDs) related to the pion distribution amplitude (DA) and generalized parton distributions (GPDs). They are obtained from a universal expression for the oneloop correction in an operator form, and will be used in the ongoing lattice calculations of the pion DA and GPDs within the parton pseudodistributions approach.
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 ...
Measurement Of The Cross Sections For Inclusive Electron Scattering In The E1214012 Experiment At Jefferson Lab, M. Murphy, H. Dai, D. Abrams, A. M. Ankowski, B. Aljawrneh, S. Alsalmi, J. Bane, S. Barcus, O. Benhar, V. Bellini, J. Bericic, D. Biswas, A. Camsonne, J. Castellanos, J.P. Chen, M. E. Christy, K. Craycraft, R. CruzTorres, D. Day, S.C. Dusa, E. Fuchey, T. Gautam, C. Giusti, J. Gomez, C. Gu, T. Hague, J.O. Hanson, F. Hauenstein, D. W. Higinbotham, C. E. Hyde, C. M. Jen, C. Keppel, S. Li, R. Lindgren, H. Liu, C. Mariani, R. E. Mcclellan, D. Meekins, R. Michaels, M. Mihovilovic, D. Nguyen, M. Nycz, L. Ou, B. Pandey, V. Pandey, K. Park, G. Perera, A. J. R. Puckett, S. N. Santiesteban, S. Širca, T. Su, L. Tang, Y. Tian, N. Ton, B. Wojtsekhowski, S. Wood, Z. Ye, J. Zhang, The Jefferson Lab Hall A Collaboration
Measurement Of The Cross Sections For Inclusive Electron Scattering In The E1214012 Experiment At Jefferson Lab, M. Murphy, H. Dai, D. Abrams, A. M. Ankowski, B. Aljawrneh, S. Alsalmi, J. Bane, S. Barcus, O. Benhar, V. Bellini, J. Bericic, D. Biswas, A. Camsonne, J. Castellanos, J.P. Chen, M. E. Christy, K. Craycraft, R. CruzTorres, D. Day, S.C. Dusa, E. Fuchey, T. Gautam, C. Giusti, J. Gomez, C. Gu, T. Hague, J.O. Hanson, F. Hauenstein, D. W. Higinbotham, C. E. Hyde, C. M. Jen, C. Keppel, S. Li, R. Lindgren, H. Liu, C. Mariani, R. E. Mcclellan, D. Meekins, R. Michaels, M. Mihovilovic, D. Nguyen, M. Nycz, L. Ou, B. Pandey, V. Pandey, K. Park, G. Perera, A. J. R. Puckett, S. N. Santiesteban, S. Širca, T. Su, L. Tang, Y. Tian, N. Ton, B. Wojtsekhowski, S. Wood, Z. Ye, J. Zhang, The Jefferson Lab Hall A Collaboration
Physics Faculty Publications
The E1214012 experiment performed at Jefferson Lab Hall A has collected inclusive electronscattering data for different targets at the kinematics corresponding to beam energy 2.222 GeV and scattering angle 15.54°. Here we present a comprehensive analysis of the collected data and compare the doubledifferential cross sections for inclusive scattering of electrons, extracted using solid targets (aluminum, carbon, and titanium) and a closed argongas cell. The data extend over broad range of energy transfer, where quasielastic interaction, Δresonance excitation, and inelastic scattering yield contributions to the cross section. The doubledifferential cross sections are reported with high precision (∼3%) for ...
Collinear Factorization In WideAngle Hadron Pair Production In E + E − Annihilation, E. Moffat, T. C. Rogers, N. Sato, A. Signori
Collinear Factorization In WideAngle Hadron Pair Production In E + E − Annihilation, E. Moffat, T. C. Rogers, N. Sato, A. Signori
Physics Faculty Publications
We compute the inclusive unpolarized dihadron production cross section in the far from backtoback region of e+ e− annihilation in leading order pQCD using existing fragmentation function fits and standard collinear factorization, focusing on the large transverse momentum region where transverse momentum is comparable to the hard scale (the centerofmass energy). We compare with standard transversemomentumdependent (TMD) fragmentation functionbased predictions intended for the small transverse momentum region with the aim of testing the expectation that the two types of calculation roughly coincide at intermediate transverse momentum. We find significant tension, within the intermediate transverse momentum region, between calculations done with ...
Validating The Water Vapor Variance Similarity Relationship In The Interfacial Layer Using Observations And LargeEddy Simulations, M. K. Osman, D. D. Turner, Thijs Heus, V. Wulfmeyer
Validating The Water Vapor Variance Similarity Relationship In The Interfacial Layer Using Observations And LargeEddy Simulations, M. K. Osman, D. D. Turner, Thijs Heus, V. Wulfmeyer
Physics Faculty Publications
In previous work, the similarity relationship for the water vapor variance in the interfacial layer (IL) at the top of the convective boundary layer (CBL) was proposed to be proportional to the convective velocity scale and the gradients of the water vapor mixing ratio and the Brunt‐Vaisala frequency in the entrainment zone. In the presence of wind shear in the IL, the similarity relationship was hypothesized to also include a dependence on the gradient Richardson number. Simultaneous measurements of the surface buoyancy flux, wind‐shear profiles from a radar wind profiler, water vapor mixing ratio and temperature measurements and ...
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 ...