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Articles 1  30 of 64
FullText Articles in Physics
Structure Of Parton QuasiDistributions And Their Moments, A. V. Radyushkin
Structure Of Parton QuasiDistributions And Their Moments, A. V. Radyushkin
Physics Faculty Publications
We discuss the structure of the parton quasidistributions (quasiPDFs) Q (y, P3) outside the "canonical" 1 <= y <= 1 support region of the usual parton distribution functions (PDFs). Writing the y(n) moments of Q (y, P3) in terms of the combined x(n2l)k(perpendicular to)(2l)moments of the transverse momentum distribution (TMD). F(x,k(perpendicular to)(2)), we establish a connection between the largevertical bar y vertical bar behavior of Q (y, P3) and largek(perpendicular to)(2) behavior of F(x,k(perpendicular to)(2)). In particular, we show that the 1/k(perpendicular to)(2) hard tail of TMDs in QCD results in a slowly decreasing similar to 1/vertical bar y vertical bar behavior of quasiPDFs for large vertical bar y vertical bar that produces infinite y(n) moments of Q(y, P3). We also relate the  1/vertical bar y vertical bar terms with the lnz(3)(2)singularities of the Ioffetime pseudodistributions m(v, z(3)(2)). Converting the operator product expansion for m(v,z(3)(2)) into a matching relation between the quasiPDF Q(y, P3) and the lightcone PDF f (x, mu(2)), we demonstrate that there is no contradiction between the infinite values of the y(n) moments of Q (y, P3) and finite values of the x(n) moments of f (x, mu(2))
Challenges With Large Transverse Momentum In SemiInclusive Deeply Inelastic Scattering, J. O. GonzalezHernandez, T. C. Rogers, N. Sato, B. Wang
Challenges With Large Transverse Momentum In SemiInclusive Deeply Inelastic Scattering, J. O. GonzalezHernandez, T. C. Rogers, N. Sato, B. Wang
Physics Faculty Publications
We survey the current phenomenological status of semiinclusive deeply inelastic scattering at moderate hard scales and in the limit of very large transverse momentum. As the transverse momentum becomes comparable to or larger than the overall hard scale, the differential cross sections should be calculable with fixed order perturbative QCD (pQCD) methods, while small transverse momentum (transversemomentumdependent factorization) approximations should eventually break down. We find large disagreement between HERMES and COMPASS data and fixed order calculations done with modern parton densities, even in regions of kinematics where such calculations should be expected to be very accurate. Possible interpretations are suggested.
HighBrilliance, HighFlux Compact Inverse Compton Light Source, K. E. Deitrick, G. A. Krafft, B. Terzić, J. R. Delayen
HighBrilliance, HighFlux Compact Inverse Compton Light Source, K. E. Deitrick, G. A. Krafft, B. Terzić, J. R. Delayen
Physics Faculty Publications
The Old Dominion University Compact Light Source (ODU CLS) design concept is presenteda compact Inverse Compton Light Source (ICLS) with flux and brilliance orders of magnitude beyond conventional laboratoryscale sources and greater than other compact ICLS designs. This concept utilizes the physics of inverse Compton scattering of an extremely low emittance electron beam by a laser pulse of rms length of approximately twothirds of a picosecond (2/3 ps). The accelerator is composed of a superconducting radio frequency (SRF) reentrant gun followed by four doublespoke SRF cavities. After the linac are three quadrupole magnets to focus the electron beam to ...
Probing HighMomentum Protons And Neutrons In NeutronRich Nuclei, The Clas Collaboration, L. B. Weinstein, S. Bültmann, D. Bulumulla, G. Charles, G. Dodge, F. Hauenstein, C. E. Hyde, A. Klein, S. Nadeeshani, Y. Prok, Z. W. Zhao
Probing HighMomentum Protons And Neutrons In NeutronRich Nuclei, The Clas Collaboration, L. B. Weinstein, S. Bültmann, D. Bulumulla, G. Charles, G. Dodge, F. Hauenstein, C. E. Hyde, A. Klein, S. Nadeeshani, Y. Prok, Z. W. Zhao
Physics Faculty Publications
The atomic nucleus is one of the densest and most complex quantummechanical systems in nature. Nuclei account for nearly all the mass of the visible Universe. The properties of individual nucleons (protons and neutrons) in nuclei can be probed by scattering a highenergy particle from the nucleus and detecting this particle after it scatters, often also detecting an additional knockedout proton. Analysis of electron and protonscattering experiments suggests that some nucleons in nuclei form closeproximity neutron–proton pairs with high nucleon momentum, greater than the nuclear Fermi momentum. However, how excess neutrons in neutronrich nuclei form such closeproximity pairs remains ...
OneLoop Evolution Of Parton PseudoDistribution Functions On The Lattice, Anatoly Radyushkin
OneLoop Evolution Of Parton PseudoDistribution Functions On The Lattice, Anatoly Radyushkin
Physics Faculty Publications
We incorporate recent calculations of oneloop corrections for the reduced Ioffetime pseudodistribution m(v, z(3)(2) thorn to extend the leadinglogarithm analysis of lattice data obtained by Orginos et al. We observe that the oneloop corrections contain a large term reflecting the fact that effective distances involved in the most important diagrams are much smaller than the nominal distance z(3). The large correction in this case may be absorbed into the evolution term, and the perturbative expansion used for extraction of parton densities at the μ ≈ 2 GeV scale is under control. The extracted parton distribution is rather ...
Electron And PositronImpact Ionization Of Inert Gases, R. I. Campeanu, H. R. J. Walters, Colm T. Whelan
Electron And PositronImpact Ionization Of Inert Gases, R. I. Campeanu, H. R. J. Walters, Colm T. Whelan
Physics Faculty Publications
Tripledifferential cross sections (TDCS) are presented for the electron and positron impact ionization of inert gas atoms in a range of geometries where a number of significant few body effects compete to define the shape of the TDCS. Using both positrons and electrons as projectiles has opened up the possibility of performing complementary studies which could effectively isolate competing interactions which cannot be separately detected in an experiment with a single projectile. A comparison is presented between theory and the recent experiments of [Gavin, deLucio, and DuBois, Phys. Rev. A95, 062703 (2017)] for e^{±} and contrasted with the results from ...
Nucleon And Nuclear Structure Through Dilepton Production, I. V. Anikin, N. Baltzell, M. Boer, R. Boussarie, V. M. Braun, S. J. Brodsky, A. Camsonne, W. C. Chang, L. Colaneri, C. E. Hyde
Nucleon And Nuclear Structure Through Dilepton Production, I. V. Anikin, N. Baltzell, M. Boer, R. Boussarie, V. M. Braun, S. J. Brodsky, A. Camsonne, W. C. Chang, L. Colaneri, C. E. Hyde
Physics Faculty Publications
Transverse momentum distributions and generalized parton distributions provide a comprehensive framework for the threedimensional imaging of the nucleon and the nucleus experimentally using deeply virtual semiexclusive and exclusive processes. The advent of combined high luminosity facilities and large acceptance detector capabilities enables experimental investigation of the partonic structure of hadrons with timelike virtual probes, in complement to the rich ongoing spacelike virtual probe program. The merits and benefits of the dilepton production channel for nuclear structure studies are discussed within the context of the International Workshop on Nucleon and Nuclear Structure through Dilepton Production taking place at the European Center ...
Numerical Study Of The Relativistic ThreeBody Quantization Condition In The Isotropic Approximation, Raúl A. Briceño, Maxwell T. Hansen, Stephen R. Sharpe
Numerical Study Of The Relativistic ThreeBody Quantization Condition In The Isotropic Approximation, Raúl A. Briceño, Maxwell T. Hansen, Stephen R. Sharpe
Physics Faculty Publications
We present numerical results showing how our recently proposed relativistic threeparticle quantization condition can be used in practice. Using the isotropic (generalized swave) approximation, and keeping only the leading terms in the effective range expansion, we show how the quantization condition can be solved numerically in a straightforward manner. In addition, we show how the integral equations that relate the intermediate threeparticle infinitevolume scattering quantity, K_{df,}3, to the physical scattering amplitude can be solved at and below threshold. We test our methods by reproducing known analytic results for the 1/L expansion of the threshold state, the volume ...
Search For ThreeNucleon ShortRange Correlations In Light Nuclei, Z. Ye, P. Solvignon, D. Nguten, P. Aguilera, Z. Ahmed, H. Albataineh, K. Allada, B. Anderson, D. Anez, L. B. Weinstein
Search For ThreeNucleon ShortRange Correlations In Light Nuclei, Z. Ye, P. Solvignon, D. Nguten, P. Aguilera, Z. Ahmed, H. Albataineh, K. Allada, B. Anderson, D. Anez, L. B. Weinstein
Physics Faculty Publications
We present new data probing shortrange correlations (SRCs) in nuclei through the measurement of electron scattering off highmomentum nucleons in nuclei. The inclusive ^{4}He/^{3}He cross section ratio is observed to be both x and Q^{2} independent for 1.5 < x < 2, confirming the dominance of twonucleon shortrange correlations. For x > 2, our data support the hypothesis that a previous claim of threenucleon correlation dominance was an artifact caused by the limited resolution of the measurement. While 3NSRCs appear to have an important contribution, our data show that isolating 3NSRCs is significantly more complicated than for 2NSRCs.
Simulation Of Inverse Compton Scattering And Its Implications On The Scattered Linewidth, N. Ranjan, B. Terzić, G. A. Krafft, V. Petrillo, I. Drebot, L. Serafini
Simulation Of Inverse Compton Scattering And Its Implications On The Scattered Linewidth, N. Ranjan, B. Terzić, G. A. Krafft, V. Petrillo, I. Drebot, L. Serafini
Physics Faculty Publications
Rising interest in inverse Compton sources has increased the need for efficient models that properly quantify the behavior of scattered radiation given a set of interaction parameters. The current stateoftheart simulations rely on Monte Carlobased methods, which, while properly expressing scattering behavior in highprobability regions of the produced spectra, may not correctly simulate such behavior in lowprobability regions (e.g. tails of spectra). Moreover, sampling may take an inordinate amount of time for the desired accuracy to be achieved. In this paper, we present an analytic derivation of the expression describing the scattered radiation linewidth and propose a model to ...
Lattice Qcd Exploration Of Parton PseudoDistribution Functions, Kostas Orginos, Anatoly Radyushkin, Joseph Karpie, Savvas Zafeiropoulos
Lattice Qcd Exploration Of Parton PseudoDistribution Functions, Kostas Orginos, Anatoly Radyushkin, Joseph Karpie, Savvas Zafeiropoulos
Physics Faculty Publications
We demonstrate a new method of extracting parton distributions from lattice calculations. The starting idea is to treat the generic equaltime matrix element M(Pz(3), z(3)(2)) as a function of the Ioffe time nu = Pz(3) and the distance z(3). The next step is to divide M(Pz(3), z(3)(2)) by the restframe density M(0, z(3)(2)). Our lattice calculation shows a linear exponential z(3)dependence in the restframe function, expected from the Z(z(3)(2)) factor generated by the gauge link. Still, we observe that the ratio M (Pz ...
Inverse Design Of Perfectly Transmitting Eigenchannels In Scattering Media, Milan Koirala, Raktim Sarma, Hui Cao, Alexey Yamilov
Inverse Design Of Perfectly Transmitting Eigenchannels In Scattering Media, Milan Koirala, Raktim Sarma, Hui Cao, Alexey Yamilov
Physics Faculty Research & Creative Works
Lightmatter interactions inside a turbid medium can be controlled by tailoring the spatial distribution of energy density throughout the system. Wavefront shaping allows selective coupling of incident light to different transmission eigenchannels, producing dramatically different spatial intensity profiles. In contrast to the density of transmission eigenvalues that is dictated by the universal bimodal distribution, the spatial structures of the eigenchannels are not universal and depend on the confinement geometry of the system. Here, we develop and verify a model for the transmission eigenchannel with the corresponding eigenvalue close to unity. By projecting the original problem of twodimensional diffusion in a ...
Angular Distribution Of SinglePhoton Superradiance In A Dilute And Cold Atomic Ensemble, A. S. Kuraptsev, I. M. Sokolov, M. D. Havey
Angular Distribution Of SinglePhoton Superradiance In A Dilute And Cold Atomic Ensemble, A. S. Kuraptsev, I. M. Sokolov, M. D. Havey
Physics Faculty Publications
On the basis of a quantum microscopic approach we study the dynamics of the afterglow of a dilute Gaussian atomic ensemble excited by pulsed radiation. Taking into account the vector nature of the electromagnetic field we analyze in detail the angular and polarization distribution of singlephoton superradiance of such an ensemble. The dependence of the angular distribution of superradiance on the length of the pulse and its carrier frequency as well as on the size and the shape of the atomic clouds is studied. We show that there is substantial dependence of the superradiant emission on the polarization and the ...
Rosenbluth Separation Of The Π0 Electroproduction Cross Section Off The Neutron, M. Mazouz, Z. Ahmed, H. Albataineh, K. Allada, K. A. Aniol, V. Bellini, M. Benali, W. Boeglin, P. Bertin, M. Canan, C. E. Hyde, S. Koirala, M. N. H. Rashad
Rosenbluth Separation Of The Π0 Electroproduction Cross Section Off The Neutron, M. Mazouz, Z. Ahmed, H. Albataineh, K. Allada, K. A. Aniol, V. Bellini, M. Benali, W. Boeglin, P. Bertin, M. Canan, C. E. Hyde, S. Koirala, M. N. H. Rashad
Physics Faculty Publications
We report the first longitudinaltransverse separation of the deeply virtual exclusive π^{0} electroproduction cross section off the neutron and coherent deuteron. The corresponding four structure functions dσ_{L}/dt, dσ_{T}/dt, dσ_{LT}/dt, and dσ_{TT}/dt are extracted as a function of the momentum transfer to the recoil system at Q^{2} = 1.75 GeV^{2} and x_{B} = 0.36. The ed > edπ^{0} cross sections are found compatible with the small values expected from theoretical models. The en > enπ^{0} cross sections show a dominance from the response to transversely polarized photons, and ...
Exclusive Η Electroproduction At W > 2 Gev With Clas And Transversity Generalized Parton Distributions, I. Bedlinskiy, V. Kubarovsky, P. Stoler, K. P. Adhikari, Z. Akbar, S. Anefalos Pereira, H. Avakian, J. Ball, N. A. Baltzell, M. Battaglieri, C. E. Hyde, M. Khachatryan, S E. Kuhn, Y. Prok, B. Torayev, L. B. Weinstein
Exclusive Η Electroproduction At W > 2 Gev With Clas And Transversity Generalized Parton Distributions, I. Bedlinskiy, V. Kubarovsky, P. Stoler, K. P. Adhikari, Z. Akbar, S. Anefalos Pereira, H. Avakian, J. Ball, N. A. Baltzell, M. Battaglieri, C. E. Hyde, M. Khachatryan, S E. Kuhn, Y. Prok, B. Torayev, L. B. Weinstein
Physics Faculty Publications
The cross section of the exclusive η electroproduction reaction ep > e'p' η was measured at Jefferson Laboratory with a 5.75 GeV electron beam and the CLAS detector. Differential cross sections d^{4}σ /dtdQ^{2} dx_{B}d φ_{η} and structure functions σ_{U}=σ_{T} + εσ_{L}, σ_{TT}, and σ_{LT,} as functions of t, were obtained over a wide range of Q^{2} and x_{B}. The η structure functions are compared with those previously measured for π^{0} at the same kinematics. At low t, both π^{0} and eta are described reasonably ...
Nonperturbative Evolution Of Parton QuasiDistributions, A. V. Radyushkin
Nonperturbative Evolution Of Parton QuasiDistributions, A. V. Radyushkin
Physics Faculty Publications
Using the formalism of parton virtuality distribution functions (VDFs) we establish a connection between the transverse momentum dependent distributions (TMDs) F(x,k^{2}_{⊥}) and quasidistributions (PQDs) Q(y,p_{3}) introduced recently by X. Ji for lattice QCD extraction of parton distributions f(x). We build models for PQDs from the VDFbased models for soft TMDs, and analyze the p_{3} dependence of the resulting PQDs. We observe a strong nonperturbative evolution of PQDs for small and moderately large values of p_{3} reflecting the transverse momentum dependence of TMDs. Thus, the study of PQDs on the lattice in ...
Charged Higgs Production In Association With A Top Quark At Approximate Nnlo, Nikolaos Kidonakis
Charged Higgs Production In Association With A Top Quark At Approximate Nnlo, Nikolaos Kidonakis
Faculty Publications
I present approximate nexttonexttoleadingorder (aNNLO) total and differential cross sections for charged Higgs production in association with a top quark at LHC energies. The aNNLO results for the process bg→tH− are derived from nexttonexttoleadinglogarithm (NNLL) resummation of softgluon corrections. Scale and partondistribution uncertainties for the cross sections are shown. The topquark transversemomentum and rapidity distributions are also calculated.
Measurement Of The TargetNormal SingleSpin Asymmetry In Quasielastic Scattering From The Reaction ^{3}He^{↑}(E,E′ ), Chiranjib Dutta, Wolfgang Korsch, Y.W. Zhang, E. Long, M. Mihovilovič, G. Jin, K. Allada, B. Anderson, J. R. M. Annand, T. Averett, C. AyerbeGayoso, W. Boeglin
Measurement Of The TargetNormal SingleSpin Asymmetry In Quasielastic Scattering From The Reaction 3He↑(E,E′ ), Chiranjib Dutta, Wolfgang Korsch, Y.W. Zhang, E. Long, M. Mihovilovič, G. Jin, K. Allada, B. Anderson, J. R. M. Annand, T. Averett, C. AyerbeGayoso, W. Boeglin
Physics and Astronomy Faculty Publications
We report the first measurement of the target singlespin asymmetry, A_{y}, in quasielastic scattering from the inclusive reaction ^{3}He^{↑}(e,e′ ) on a ^{3}He gas target polarized normal to the lepton scattering plane. Assuming timereversal invariance, this asymmetry is strictly zero for onephoton exchange. A nonzero A_{y} can arise from the interference between the one and twophoton exchange processes which is sensitive to the details of the substructure of the nucleon. An experiment recently completed at Jefferson Lab yielded asymmetries with high statistical precision at Q^{2}=0.13, 0.46, and 0.97 GeV^{2 ...}
EletronHelium LaserAssisted FreeFree Scattering For Incident Energies From 30  200 Ev: Effects Of Polarization Direction, B. A. Deharak, Benjamin Nosarzewski, Mahsa Siavashpouri, Nicholas L. S. Martin
EletronHelium LaserAssisted FreeFree Scattering For Incident Energies From 30  200 Ev: Effects Of Polarization Direction, B. A. Deharak, Benjamin Nosarzewski, Mahsa Siavashpouri, Nicholas L. S. Martin
Physics and Astronomy Faculty Publications
We report on experiments that examine electronhelium scattering in the presence of an Nd:YAG laser field of 1.17 eV photons. At each incidentelectron energy (30, 60, and 200 eV), the laser polarization direction is varied within a plane perpendicular to the Watson approximation calculations.
Inelastic Neutron Scattering Cross Sections For ^{76}Ge Relevant To Background In Neutrinoless DoubleΒ Decay Experiments, Benjamin P. Crider, Erin Elizabeth Peters, J. M. Allmond, Marcus T. Mcellistrem, Francisco M. PradosEstévez, T. J. Ross, J. R. Vanhoy, Steven W. Yates
Inelastic Neutron Scattering Cross Sections For 76Ge Relevant To Background In Neutrinoless DoubleΒ Decay Experiments, Benjamin P. Crider, Erin Elizabeth Peters, J. M. Allmond, Marcus T. Mcellistrem, Francisco M. PradosEstévez, T. J. Ross, J. R. Vanhoy, Steven W. Yates
Physics and Astronomy Faculty Publications
The experimental signature in searches for the neutrinoless doubleβ decay of ^{76}Ge is a peak near 2039 keV in the spectrum. Given the low probability of the process, it is important that the background in this region be well understood. Inelastic scattering reactions with neutrons from muoninduced interactions and (α,n) reactions in the surrounding materials or in the detector can provide contributions to the background. We have measured the production cross sections for γ rays from the ^{76}Ge(n,n'γ ) reaction in the 2039keV region at incident neutron energies up to 4.9 MeV. In ...
Compton Scattering From The Deuteron Below PionProduction Threshold, L. S. Myers, J. R. M. Annand, J. Brudvik, G. Feldman, K. G. Fissum, H. W. Grießhammer, K. Hansen, S. S. Henshaw, L. Isaksson, R. Jebali, Michael A. Kovash, M. Lundin, D. G. Middleton, A. M. Nathan, B. Schröder, S. C. Stave
Compton Scattering From The Deuteron Below PionProduction Threshold, L. S. Myers, J. R. M. Annand, J. Brudvik, G. Feldman, K. G. Fissum, H. W. Grießhammer, K. Hansen, S. S. Henshaw, L. Isaksson, R. Jebali, Michael A. Kovash, M. Lundin, D. G. Middleton, A. M. Nathan, B. Schröder, S. C. Stave
Physics and Astronomy Faculty Publications
Differential cross sections for elastic scattering of photons from the deuteron have recently been measured at the TaggedPhoton Facility at theMAX IV Laboratory in Lund, Sweden. These first new measurements in more than a decade further constrain the isoscalar electromagnetic polarizabilities of the nucleon and provide the firstever results above 100 MeV, where the sensitivity to the polarizabilities is increased. We add 23 points between 70 and 112 MeV, at angles 60^{◦}, 120^{◦}, and 150^{◦}. Analysis of these data using a chiral effective field theory indicates that the cross sections are both selfconsistent and consistent with previous measurements. Extracted values ...
Measurement Of The Scattering Cross Section Of Slow Neutrons On Liquid Parahydrogen From Neutron Transmission, K. B. Grammer, R. Alarcon, L. BarrónPalos, D. Blyth, J. D. Bowman, J. Calarco, Christopher Crawford, K. Craycroft, D. Evans, N. Fomin, J. Fry, M. Gericke, R. C. Gillis, G. L. Greene, J. Hamblen, C. Hayes, S. Kucuker, R. Mahurin, M. MaldonadoVelázquez, E. Martin, M. Mccrea, P. E. Mueller, M. Musgrave, H. Nann, S. I. Penttilä, W. M. Snow, Z. Tang, W. S. Wilburn
Measurement Of The Scattering Cross Section Of Slow Neutrons On Liquid Parahydrogen From Neutron Transmission, K. B. Grammer, R. Alarcon, L. BarrónPalos, D. Blyth, J. D. Bowman, J. Calarco, Christopher Crawford, K. Craycroft, D. Evans, N. Fomin, J. Fry, M. Gericke, R. C. Gillis, G. L. Greene, J. Hamblen, C. Hayes, S. Kucuker, R. Mahurin, M. MaldonadoVelázquez, E. Martin, M. Mccrea, P. E. Mueller, M. Musgrave, H. Nann, S. I. Penttilä, W. M. Snow, Z. Tang, W. S. Wilburn
Physics and Astronomy Faculty Publications
Liquid hydrogen is a dense Bose fluid whose equilibrium properties are both calculable from first principles using various theoretical approaches and of interest for the understanding of a wide range of questions in manybody physics. . . .
The remainder of this abstract can be read at:
http://dx.doi.org/10.1103/PhysRevB.91.180301
Separated Response Functions In Exclusive, Forward Π± Electroproduction On Deuterium, G. M. Huber, H. P. Blok, A. Klein, L. M. Qin, K. Vansyoc, Jefferson Lab, Fπ Collaboration
Separated Response Functions In Exclusive, Forward Π± Electroproduction On Deuterium, G. M. Huber, H. P. Blok, A. Klein, L. M. Qin, K. Vansyoc, Jefferson Lab, Fπ Collaboration
Physics Faculty Publications
Background: Measurements of forward exclusive meson production at different squared fourmomenta of the exchanged virtual photon, Q^{2}, and at different fourmomentum transfer, t, can be used to probe QCD's transition from mesonnucleon degrees of freedom at long distances to quarkgluon degrees of freedom at short scales. Ratios of separated response functions in π^{} and π^{+} electroproduction are particularly informative. The ratio for transverse photons may allow this transition to be more easily observed, while the ratio for longitudinal photons provides a crucial verification of the assumed pole dominance, needed for reliable extraction of the pion form factor from ...
Direct Observation Of QuarkHadron Duality In The Free Neutron F2 Structure Function, I. Niculescu, G. Niculescu, W. Melnitchouk, J. Arrington, M. E. Christy, S. Kuhn
Direct Observation Of QuarkHadron Duality In The Free Neutron F2 Structure Function, I. Niculescu, G. Niculescu, W. Melnitchouk, J. Arrington, M. E. Christy, S. Kuhn
Physics Faculty Publications
Using the recently published data from the BONuS(Barely Offshell Nucleon Structure) experiment at Jefferson Lab, which utilized a spectator tagging technique to extract the inclusive electronfree neutron scattering cross section, we obtain the first direct observation of quarkhadron duality in the neutron F2 structure function. The data are used to reconstruct the lowest few (N = 2, 4, and 6) moments of F2 in the three prominent nucleon resonance regions, as well as the moments integrated over the entire resonance region. Comparison with moments computed from global parametrizations of parton distribution functions suggest that quarkhadron duality holds locally for the ...
Rapidity Evolution Of Gluon Tmd From Low To Moderate X, I. Balitsky, A. Tarasov
Rapidity Evolution Of Gluon Tmd From Low To Moderate X, I. Balitsky, A. Tarasov
Physics Faculty Publications
We study how the rapidity evolution of gluon transverse momentum dependent distribution changes from nonlinear evolution at small x << 1 to linear evolution at moderate x ∼ 1.
Single Spin Asymmetries In Charged Kaon Production From SemiInclusive Deep Inelastic Scattering On A Transversely Polarized ^{3}He Target, C. Dutta, A. Kolarkar, Wolfgang Korsch, Y. X. Zhao, Y. Wang, K. Allada, K. Aniol, J. R. M. Annand, T. Averett, F. Benmokhtar, W. Bertozzi, P. C. Bradshaw, P. Bosted
Single Spin Asymmetries In Charged Kaon Production From SemiInclusive Deep Inelastic Scattering On A Transversely Polarized 3He Target, C. Dutta, A. Kolarkar, Wolfgang Korsch, Y. X. Zhao, Y. Wang, K. Allada, K. Aniol, J. R. M. Annand, T. Averett, F. Benmokhtar, W. Bertozzi, P. C. Bradshaw, P. Bosted
Physics and Astronomy Faculty Publications
We report the first measurement of target single spin asymmetries of charged kaons produced in semiinclusive deep inelastic scattering of electrons off a transversely polarized ^{3}He target. Both the Collins and Sivers moments, which are related to the nucleon transversity and Sivers distributions, respectively, are extracted over the kinematic range of 0.1<x_{bj}<0.4 for K^{+} and K^{−} production. While the Collins and Sivers moments for K^{+} are consistent with zero within the experimental uncertainties, both moments for K^{−} favor negative values. The Sivers moments are compared to the theoretical prediction from a phenomenological fit to the world data. While ...
Measurement Of “Pretzelosity” Asymmetry Of Charged Pion Production In SemiInclusive Deep Inelastic Scattering On A Polarized ^{3}He Target, K. Allada, C. Dutta, A. Kolarkar, Wolfgang Korsch, Y. Zhang, X. Qian, J. Huang, J. Katich, Y. Wang, K. Aniol, J. R. M. Annand, T. Averett
Measurement Of “Pretzelosity” Asymmetry Of Charged Pion Production In SemiInclusive Deep Inelastic Scattering On A Polarized 3He Target, K. Allada, C. Dutta, A. Kolarkar, Wolfgang Korsch, Y. Zhang, X. Qian, J. Huang, J. Katich, Y. Wang, K. Aniol, J. R. M. Annand, T. Averett
Physics and Astronomy Faculty Publications
An experiment to measure singlespin asymmetries of semiinclusive production of charged pions in deepinelastic scattering on a transversely polarized ^{3}He target was performed at Jefferson Laboratory in the kinematic region of 0.16<x<0.35 and 1.42<2.7 GeV^{2} Pretzelosity asymmetries on ^{3}He, which are expressed as the convolution of the h^{⊥}_{1T} transversemomentumdependent distribution functions and the Collins fragmentation functions in the leading order, were measured for the first time. Under the effective polarization approximation, we extracted the corresponding neutron asymmetries from the measured ^{3}He asymmetries and crosssection ratios between the proton and ^{3}He. Our results show that both ...
Measurement Of The TargetNormal SingleSpin Asymmetry In DeepInelastic Scattering From The Reaction ^{3}He^{↑}(E,E′)X, K. Allada, C. Dutta, A. Kolarkar, Wolfgang Korsch, J. Katich, X. Qian, Y. X. Zhao, K. Aniol, J. R. M. Annand, T. Averett, F. Benmokhtar, W. Bertozzi, P. C. Bradshaw, P. Bosted
Measurement Of The TargetNormal SingleSpin Asymmetry In DeepInelastic Scattering From The Reaction 3He↑(E,E′)X, K. Allada, C. Dutta, A. Kolarkar, Wolfgang Korsch, J. Katich, X. Qian, Y. X. Zhao, K. Aniol, J. R. M. Annand, T. Averett, F. Benmokhtar, W. Bertozzi, P. C. Bradshaw, P. Bosted
Physics and Astronomy Faculty Publications
We report the first measurement of the targetnormal singlespin asymmetry in deepinelastic scattering from the inclusive reaction ^{3}He^{↑}(e,e′)X on a polarized ^{3}He gas target. Assuming timereversal invariance, this asymmetry is strictly zero in the Born approximation but can be nonzero if twophotonexchange contributions are included. The experiment, conducted at Jefferson Lab using a 5.89 GeV electron beam, covers a range of 1.7<W<2.9 GeV, 1.0<Q^{2}<4.0 GeV^{2} and 0.16<x<6.5. Neutron asymmetries were extracted using the effective nucleon polarization and measured protonto^{3}He crosssection ratios. The measured neutron asymmetries are negative with an average value of (−1.09±0.38)×10^{−2} for invariant ...
Fully Differential Cross Sections For ElectronImpact ExcitationIonization Of Aligned D_{2}, Esam Ali, A. L. Harris, J. Lower, E. Weigold, ChuangGang Ning, Don H. Madison
Fully Differential Cross Sections For ElectronImpact ExcitationIonization Of Aligned D2, Esam Ali, A. L. Harris, J. Lower, E. Weigold, ChuangGang Ning, Don H. Madison
Physics Faculty Research & Creative Works
We examine fully differential cross sections for 176 eV electronimpact dissociative excitationionization of orientated D2 for transitions to final ion states 2sσ_{g}, 2pσ_{u}, and 2pπ_{u}. In previous work [Phys. Rev. A 88, 062705 (2013)PLRAAN1050294710.1103/PhysRevA.88.062705], we calculated these cross sections using the molecular fourbody distorted wave (M4DW) method with the groundstate D2 wave function being approximated by a product of two Dyson 1stype orbitals. The theoretical results were compared with experimental measurements for five different orientations of the target molecule (four in the scattering plane and one perpendicular to the scattering plane). For ...
Monte Carlo Simulations Of Atmospheric Loss By Stellar Winds From Exoplanets, Daniel P. Violette
Monte Carlo Simulations Of Atmospheric Loss By Stellar Winds From Exoplanets, Daniel P. Violette
University Scholar Projects
Hot Jupiters are a class of extrasolar planets. Massive gas giants on the same size scale as Jupiter, they orbit their host stars closely. This proximity results in large stellar winds capable of stripping away a planet’s atmosphere. Developing a more complete understanding of atmospheric mass loss and evolution in planetary bodies is critical, and Hot Jupiter systems are accessible analogues.
This project will seek to create a computational model capable of estimating mass loss rates due to stellar winds. A Monte Carlo method is utilized to take an ensemble of single, highenergy energetic neutral particles, produced by kiloelectronvolt ...