Publications (64)
Search for Narrow Nucleon Resonances below Pion Threshold in the H(e,e'pi^+)X and D(e,e'p)X Reactions
M. Kohl, M. Ases Antelo, C. Ayerbe +23
In two series of high-resolution coincidence experiments at the three-spectrometer facility at MAMI, the H(e,e'pi^+)X and D(e,e'p)X reactions were studied to search for narrow nucl…
Technical Supplement to "Polarization Transfer Observables in Elastic Electron-Proton Scattering at Q = 2.5, 5.2, 6.8, and 8.5 GeV"
A. J. R. Puckett, E. J. Brash, M. K. Jones +103
The GEp-III and GEp-2 experiments, carried out in Jefferson Lab's Hall C from 2007-2008, consisted of measurements of polarization transfer in elastic electron-proton scatterin…
The Present and Future of QCD
P. Achenbach, D. Adhikari, A. Afanasev +400
This White Paper presents the community inputs and scientific conclusions from the Hot and Cold QCD Town Meeting that took place September 23-25, 2022 at MIT, as part of the Nuclea…
High Resolution Spectroscopic Study of Be
T. Gogami, C. Chen, D. Kawama +83
Spectroscopy of a Be hypernucleus was carried out at JLab Hall C using the reaction. A new magnetic spectrometer system (SPL+HES+HKS), specifically…
Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio to Q^2 = 8.5 GeV^2
A. J. R. Puckett, E. J. Brash, M. K. Jones +103
Among the most fundamental observables of nucleon structure, electromagnetic form factors are a crucial benchmark for modern calculations describing the strong interaction dynamics…
New determination of the branching ratio of the structure dependent radiative decay
A. Kobayashi, H. Ito, S. Bianchin +23
The branching ratio of the structure dependent (SD) radiative decay relative to that of the decay including the interna…
Spectroscopy of the neutron-rich hypernucleus He from electron scattering
T. Gogami, C. Chen, D. Kawama +83
The missing mass spectroscopy of the He hypernucleus was performed, using the LiHe reaction at the Thomas Jefferson National Accelerator…
Technical Design Report for the Paul Scherrer Institute Experiment R-12-01.1: Studying the Proton "Radius" Puzzle with μp Elastic Scattering
R. Gilman, E. J. Downie, G. Ron +56
The difference in proton radii measured with atoms and with atoms and scattering remains an unexplained puzzle. The PSI MUSE proposal is to measure and scatt…
Ruling out color transparency in quasi-elastic C(e,e'p) up to of 14.2 (GeV/c)
D. Bhetuwal, J. Matter, H. Szumila-Vance +87
Quasielastic C scattering was measured at space-like 4-momentum transfer squared ~=~8, 9.4, 11.4, and 14.2 (GeV/c), the highest ever achieved to date. Nucl…
The OLYMPUS Experiment
R. Milner, D. K. Hasell, M. Kohl +70
The OLYMPUS experiment was designed to measure the ratio between the positron-proton and electron-proton elastic scattering cross sections, with the goal of determining the contrib…
Measurement of the Vector and Tensor Asymmetries at Large Missing Momentum in Quasielastic Electron Scattering from Deuterium
A. DeGrush, A. Maschinot, T. Akdogan +41
We report the measurement of the beam-vector and tensor asymmetries and in quasielastic electrodisintegration of the deuteron at the MIT…
The neutron charge form factor and target analyzing powers from pol.3He(pol e,e'n)-scattering
J. Bermuth, P. Merle, C. C. Carasco +40
The charge form factor of the neutron has been determined from asymmetries measured in quasi--elastic pol.3He(pol e,e'n) at a momentum transfer of 0.67(GeV/c)^2. In addition, the t…
Blinding for precision scattering experiments: The MUSE approach as a case study
J. C. Bernauer, E. W. Cline, H. Atac +27
Human bias is capable of changing the analysis of measured data sufficiently to alter the results of an experiment. It is incumbent upon modern experiments, especially those invest…
Search for effects beyond the Born approximation in polarization transfer observables in elastic scattering
M. Meziane, E. J. Brash, R. Gilman +108
Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton electric to magnetic form factor ratio, $G_…
Workshop on Physics with Neutral Kaon Beam at JLab (KL2016) Mini-Proceedings
M. Albrow, M. Amaryan, E. Chudakov +34
The KL2016 Workshop is following the Letter of Intent LoI12-15-001 "Physics Opportunities with Secondary KL beam at JLab" submitted to PAC43 with the main focus on the physics of e…
Measurement of the Charge-Averaged Elastic Lepton-Proton Scattering Cross Section by the OLYMPUS Experiment
J. C. Bernauer, A. Schmidt, B. S. Henderson +67
We report the first measurement of the average of the electron-proton and positron-proton elastic scattering cross sections. This lepton charge-averaged cross section is insensitiv…
The MUSE Target Chamber Post Veto
R. Ratvasky, T. Rostomyan, M. Ali +46
The Muon Scattering Experiment (MUSE) was developed to address the proton radius puzzle through simultaneous electron-proton and muon-proton scattering using the Paul Scherrer Inst…
Design and Performance of the Spin Asymmetries of the Nucleon Experiment
J. D. Maxwell, W. R. Armstrong, S. Choi +102
The Spin Asymmetries of the Nucleon Experiment (SANE) performed inclusive, double-polarized electron scattering measurements of the proton at the Continuous Electron Beam Accelerat…
The MUSE Beamline Calorimeter
W. Lin, T. Rostomyan, R. Gilman +40
The MUon Scattering Experiment (MUSE) was motivated by the proton radius puzzle arising from the discrepancy between muonic hydrogen spectroscopy and electron-proton measurements.…
Direct Measurements of the Lifetime of Heavy Hypernuclei
X. Qiu, L. Tang, A. Margaryan +83
The lifetime of a Lambda particle embedded in a nucleus (hypernucleus) decreases from that of free Lambda decay due to the opening of the Lambda N to NN weak decay channel. However…
DarkLight: A Search for Dark Forces at the Jefferson Laboratory Free-Electron Laser Facility
J. Balewski, J. Bernauer, W. Bertozzi +64
We give a short overview of the DarkLight detector concept which is designed to search for a heavy photon A' with a mass in the range 10 MeV/c^2 < m(A') < 90 MeV/c^2 and which deca…
Investigation of the Exclusive ^{3}He(e,e'pn)p Reaction
D. G. Middleton, J. R. M. Annand, M. Ases Antelo +46
Cross sections for the ^{3}He(e,e'pn)p reaction were measured for the first time at energy transfers of 220 and 270 MeV for several momentum transfers ranging from 300 to 450 MeV/c…
Polarization Transfer in Wide-Angle Compton Scattering and Single-Pion Photoproduction from the Proton
C. Fanelli, E. Cisbani, D. J. Hamilton +65
Wide-angle exclusive Compton scattering and single-pion photoproduction from the proton have been investigated via measurement of the polarization transfer from a circularly polari…
Dark Sectors and New, Light, Weakly-Coupled Particles
R. Essig, J. A. Jaros, W. Wester +86
Dark sectors, consisting of new, light, weakly-coupled particles that do not interact with the known strong, weak, or electromagnetic forces, are a particularly compelling possibil…
Searching for New Physics with DarkLight at the ARIEL Electron-Linac
The DarkLight Collaboration, E. Cline, R. Corliss +43
The search for a dark photon holds considerable interest in the physics community. Such a force carrier would begin to illuminate the dark sector. Many experiments have searched fo…
An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab
A. Accardi, A. Afanasev, I. Albayrak +227
Positron beams, both polarized and unpolarized, are identified as essential ingredients for the experimental programs at the next generation of lepton accelerators. In the context…
The design and basic performance of a Spiral Fiber Tracker for the J-PARC E36 experiment
O. Mineev, S. Bianchin, M. D. Hasinoff +12
A spiral fiber tracker (SFT) has been designed and produced for the J-PARC E36 experiment as an element of the tracking system for conducting a high-resolution momentum measurement…
Surface Excitations in a Bose-Einstein Condensate
R. Onofrio, D. S. Durfee, C. Raman +3
Surface modes in a Bose-Einstein condensate of sodium atoms have been studied. We observed excitations of standing and rotating quadrupolar and octopolar modes. The modes were exci…
The experiments with the High Resolution Kaon Spectrometer at JLab Hall C and the new spectroscopy of hypernuclei
L. Tang, C. Chen, T. Gogami +130
Since the pioneering experiment, E89-009 studying hypernuclear spectroscopy using the reaction was completed, two additional experiments, E01-011 and E05-115, w…
The Charge Form Factor of the Neutron at Low Momentum Transfer from the Reaction
E. Geis, V. Ziskin, T. Akdogan +45
We report new measurements of the neutron charge form factor at low momentum transfer using quasielastic electrodisintegration of the deuteron. Longitudinally polarized electrons a…
Measurement of the LT-asymmetry in Ï^0 electroproduction at the energy of the Î(1232) resonance
D. Elsner, A. Süle, P. Barneo +29
The reaction p(e,e'p)pi^0 has been studied at Q^2=0.2 (GeV/c)^2 in the region of W=1232 MeV. From measurements left and right of q, cross section asymmetries Ï_LT have been obtain…
Studying the Proton "Radius" Puzzle with μp Elastic Scattering
R. Gilman, E. J. Downie, G. Ron +45
The Proton Radius Puzzle is the inconsistency between the proton radius determined from muonic hydrogen and the proton radius determined from atomic hydrogen level transitions and…
Physics with Positron Beams at Jefferson Lab 12 GeV
A. Afanasev, I. Albayrak, S. Ali +124
Positron beams, both polarized and unpolarized, are identified as essential ingredients for the experimental program at the next generation of lepton accelerators. In the context o…
Design and Operation of a Windowless Gas Target Internal to a Solenoidal Magnet for Use with a Megawatt Electron Beam
S. Lee, R. Corliss, I. FriÅ¡ÄiÄ +37
A windowless hydrogen gas target of nominal thickness cm is an essential component of the DarkLight experiment, which is designed to utilize the megawatt electron…
Final State Interaction Effects in pol 3He(pol e,e'p)
C. Carasco, J. Bermuth, P. Merle +40
Asymmetries in quasi-elastic pol 3He(pol e,e'p) have been measured at a momentum transfer of 0.67 (GeV/c)^2 and are compared to a calculation which takes into account relativistic…
Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering: Determined by the OLYMPUS Experiment
B. S. Henderson, L. D. Ice, D. Khaneft +67
The OLYMPUS collaboration reports on a precision measurement of the positron-proton to electron-proton elastic cross section ratio, , a direct measure of the contribution…
Evidence for a critical velocity in a Bose-Einstein condensed gas
C. Raman, M. Kohl, R. Onofrio +4
We have studied dissipation in a Bose--Einstein condensed gas by moving a blue detuned laser beam through the condensate at different velocities. Strong heating was observed only a…
New Prototype Multi-gap Resistive Plate Chambers with Long Strips
Y. J. Sun, C. Li, M. Shao +22
A new kind of Multi-gap Resistive Plate Chamber (MRPC) has been built for the large-area Muon Telescope Detector (MTD) for the STAR experiment at RHIC. These long read-out strip MR…
First measurements of the ^16O(e,e'pn)^14N reaction
D. G. Middleton, J. R. M. Annand, C. Barbieri +39
This paper reports on the first measurement of the ^16O(e,e'pn)^14N reaction. Data were measured in kinematics centred on a super-parallel geometry at energy and momentum transfers…
First Measurement of the EMC Effect in B and B
A. Karki, D. Biswas, F. A. Gonzalez +94
The nuclear dependence of the inclusive inelastic electron scattering cross section (the EMC effect) has been measured for the first time in B and B. Previous measure…
Self energies of the pion and the delta isobar from the ^3He(e,e'pi^+)^3H reaction
M. Kohl, M. Kuss, C. Rangacharyulu +7
In a kinematically complete experiment at the Mainz microtron MAMI, pion angular distributions of the He(e,e'H reaction have been measured in the excitation region of…
Two-Photon EXchange -- TPEX
R. Alarcon, R. Beck, J. C. Bernauer +33
We propose a new measurement of the ratio of positron-proton to electron-proton, elastic scattering at DESY to determine the contributions beyond single-photon exchange, which are…
The Two-Photon Exchange Experiment at DESY
R. Alarcon, R. Beck, J. C. Bernauer +36
We propose a new measurement of the ratio of positron-proton to electron-proton elastic scattering at DESY. The purpose is to determine the contributions beyond single-photon excha…
Fundamental Physics at the Intensity Frontier
J. L. Hewett, H. Weerts, R. Brock +465
The Proceedings of the 2011 workshop on Fundamental Physics at the Intensity Frontier. Science opportunities at the intensity frontier are identified and described in the areas of…
Operation and characterization of a windowless gas jet target in high-intensity electron beams
B. S. Schlimme, S. Aulenbacher, P. Brand +54
A cryogenic supersonic gas jet target was developed for the MAGIX experiment at the high-intensity electron accelerator MESA. It will be operated as an internal, windowless target…
Instrumental uncertainties in radiative corrections for the MUSE experiment
L. Li, S. Strauch, J. C. Bernauer +27
The MUSE experiment at the Paul Scherrer Institute is measuring elastic lepton-proton scattering cross sections in a four-momentum transfer range from of approximately 0.002…
Low- elastic electron-proton scattering using a gas jet target
Y. Wang, J. C. Bernauer, B. S. Schlimme +54
In this paper, we describe an experiment measuring low- elastic electron-proton scattering using a newly developed cryogenic supersonic gas jet target in the A1 three-spectrom…
Measurement of the Electric Form Factor of the Neutron at Q^2 = 0.3-0.8 (GeV/c)^2
D. I. Glazier, M. Seimetz, J. R. M. Annand +41
The electric form factor of the neutron, G_En, has been measured at the Mainz Microtron by recoil polarimetry in the quasielastic D(e_pol,e'n_pol)p reaction. Three data points have…
Revealing Color Forces with Transverse Polarized Electron Scattering
W. Armstrong, H. Kang, A. Liyanage +101
The Spin Asymmetries of the Nucleon Experiment (SANE) measured two double spin asymmetries using a polarized proton target and polarized electron beam at two beam energies, 4.7 GeV…
The DarkLight Experiment: A Precision Search for New Physics at Low Energies
J. Balewski, J. Bernauer, J. Bessuille +37
We describe the current status of the DarkLight experiment at Jefferson Laboratory. DarkLight is motivated by the possibility that a dark photon in the mass range 10 to 100 MeV/c$^…
Polarization Transfer Observables in Elastic Electron Proton Scattering at 2.5, 5.2, 6.8, and 8.5 GeV
A. J. R. Puckett, E. J. Brash, M. K. Jones +104
The GEp-III and GEp-2 experiments were carried out in Jefferson Lab's (JLab's) Hall C from 2007-2008, to extend the knowledge of to the highest practically achiev…
Measurement of structure dependent radiative decays using stopped positive kaons
H. Ito, A. Kobayashi, S. Bianchin +24
The structure dependent radiative () decay was investigated with stopped positive kaons. The momentum spectra containing 574$\…
The Role of Mesons in the Electromagnetic Form Factors of the Nucleon
C. Crawford, T. Akdogan, R. Alarcon +44
The roles played by mesons in the electromagnetic form factors of the nucleon are explored using as a basis a model containing vector mesons with coupling to the continuum together…
Spectroscopy of hyperlithium by the reaction
T. Gogami, C. Chen, D. Kawama +84
Missing mass spectroscopy with the reaction was performed at Jefferson Laboratory's Hall C for the neutron rich hypernucleus . The groun…
Constraints on the onset of color transparency from quasi-elastic C up to (GeV
D. Bhetuwal, J. Matter, H. Szumila-Vance +87
Quasi-elastic scattering on C was measured in Hall C at Jefferson Lab for space-like 4-momentum transfer squared in the range of 8--14.2\,(GeV/) with p…
Proton Form Factor Ratio, from Double Spin Asymmetry
A. Liyanage, W. Armstrong, H. Kang +97
The ratio of the electric and magnetic form factor of the proton, , has been measured for elastic electron-proton scattering with polarized beam and target up to…
Report of the Quark Flavor Physics Working Group
J. N. Butler, Z. Ligeti, J. L. Ritchie +81
This report represents the response of the Intensity Frontier Quark Flavor Physics Working Group to the Snowmass charge. We summarize the current status of quark flavor physics and…
Polarization transfer in the HeH reaction
S. Dieterich, P. Bartsch, D. Baumann +39
Polarization transfer in the 4He(e,e'p)3H reaction at a Q^2 of 0.4 (GeV/c)^2 was measured at the Mainz Microtron MAMI. The ratio of the transverse to the longitudinal polarization…
Polarization components in photoproduction at photon energies up to 5.6 GeV
W. Luo, E. J. Brash, R. Gilman +107
We present new data for the polarization observables of the final state proton in the reaction. These data can be used to test predictions based on ha…
Separated cross sections in Ï^0 electroproduction at threshold at Q^2 = 0.05 GeV^2/c^2
M. Weis, P. Bartsch, D. Baumann +26
The differential cross sections Ï_0=Ï_T+εÏ_L, Ï_{LT}, and Ï_{TT} of Ï^0 electroproduction from the proton were measured from threshold up to an additional center of mass ene…
Measurement of the proton electric to magnetic form factor ratio from \vec ^1H(\vec e, e'p)
C. B. Crawford, A. Sindile, T. Akdogan +51
We report the first precision measurement of the proton electric to magnetic form factor ratio from spin-dependent elastic scattering of longitudinally polarized electrons from a p…
Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab
A. Accardi, P. Achenbach, D. Adhikari +441
This document presents the initial scientific case for upgrading the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (JLab) to 22 GeV. It is the result of a…
Characterization of Muon and Electron Beams in the Paul Scherrer Institute PiM1 Channel for the MUSE Experiment
E. Cline, W. Lin, P. Roy +57
The MUon Scattering Experiment, MUSE, at the Paul Scherrer Institute, Switzerland, investigates the proton charge radius puzzle, lepton universality, and two-photon exchange, via s…
Beam-helicity asymmetry in photon and pion electroproduction in the Delta(1232) resonance region at Q^2= 0.35 (GeV/c)^2
A1 Collaboration, I. K. Bensafa, P. Achenbach +40
The beam-helicity asymmetry has been measured simultaneously for the reactions (e p \to e p γ) and (e p \to e p Ï^0) in the resonance region at 0.35 (GeV/c)…