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549 results on '"Joosten S"'

1. Pion electroproduction measurements in the nucleon resonance region

Author: Li, R., Sparveris, N., Atac, H., Jones, M. K., Paolone, M., Akbar, Z., Ali, M., Gayoso, C. Ayerbe, Berdnikov, V., Biswas, D., Boer, M., Camsonne, A., Chen, J. -P., Diefenthaler, M., Duran, B., Dutta, D., Gaskell, D., Hansen, O., Hauenstein, F., Heinrich, N., Henry, W., Horn, T., Huber, G. M., Jia, S., Joosten, S., Karki, A., Kay, S. J. D., Kumar, V., Li, X., Li, W. B., Liyanage, A. H., Mack, D., Malace, S., Markowitz, P., McCaughan, M., Meziani, Z. -E., Mkrtchyan, H., Morean, C., Muhoza, M., Narayan, A., Pasquini, B., Rehfuss, M., Sawatzky, B., Smith, G. R., Smith, A., Trotta, R., Yero, C., Zheng, X., and Zhou, J.
Subjects: Nuclear Experiment, Nuclear Theory
Abstract: We report new pion electroproduction measurements in the $\Delta(1232)$ resonance, utilizing the SHMS - HMS magnetic spectrometers of Hall C at Jefferson Lab. The data focus on a region that exhibits a strong and rapidly changing interplay of the mesonic cloud and quark-gluon dynamics in the nucleon. The results are in reasonable agreement with models that employ pion cloud effects and chiral effective field theory calculations, but at the same time they suggest that an improvement is required to the theoretical calculations and provide valuable input that will allow their refinements. The data illustrate the potential of the magnetic spectrometers setup in Hall C towards the study the $\Delta(1232)$ resonance. These first reported results will be followed by a series of measurements in Hall C, that will expand the studies of the $\Delta(1232)$ resonance offering a high precision insight within a wide kinematic range from low to high momentum transfers.
Published: 2024
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2. Performance of a coarsely pixelated LAPPD photosensor for the SoLID gas Cherenkov detectors

Author: Xie, J., Peng, C., Joosten, S., Meziani, Z. -E., Camsonne, A., Jones, M., Malace, S., Kaczanowicz, E., Rehfuss, M., Sparveris, N., Paolone, M., Foley, M., Minot, M., Popecki, M., and Zhao, Z. W.
Subjects: Physics - Instrumentation and Detectors
Abstract: The SoLID spectrometer's gas Cherenkov counters require photosensors that operate in a high luminosity and high background environment. The reference design features arrays of 9 or 16 tiled multi-anode photomultipliers (MaPMTs), distributed across 32 sectors, to serve the light-gas and heavy-gas Cherenkov counters, respectively. To assess the viability of a pixelated INCOM Large Area Picosecond Photodetector (LAPPD$^{\rm TM}$) as an alternative photosensor to replace MaPMT arrays in either detector, we evaluated its performance under realistic SoLID running conditions in Hall C at the Thomas Jefferson National Accelerator Facility (Jefferson Lab). The results of this test confirmed that the coarse-pixelated (2.5$\times$2.5 cm$^2$ pixel size) LAPPD is capable of handling the total projected signal and background rates of the three pillar SoLID experiments. The tested photosensor detected Cherenkov signals with the capability of separating single-electron events from pair production events while rejecting background. Although the design was not aimed at ring-imaging Cherenkov detectors, Cherenkov disk images were captured in two different gas radiators. Through a direct comparison with a GEANT4 simulation, we confirmed the experimental performance of the LAPPD., Comment: 11 pages, 8 figures
Published: 2024

3. Measurement of the Generalized Polarizabilities of the Proton in Virtual Compton Scattering

Author: Atac, H., Camsonne, A., Jones, M. K., Paolone, M., Sparveris, N., Sayadat, N., Shesthra, S., Li, R., Webster, S., Chen, J-P., Covrig-Dusa, S., Deur, A., McCaughan, M. D., Tadepalli, A., Armstrong, W., Joosten, S., Meziani, Z. E., Peng, C., Ali, M., Katramatou, A. T., Petratos, G. G., Brash, E., Bernauer, J., Cline, E., Li, W., Huber, G., Zhao, Z., Liyanage, N., Nycz, M., Gilman, R., Gayoso, C. Ayerbe, Mihovilovič, M., Širca, S., Demirci, M., Androič, D., Markowitz, P., Arora, A., Ruth, D., Slifer, N. Santiesteban K., and Zec, A.
Subjects: Nuclear Experiment
Abstract: We propose to conduct a measurement of the Virtual Compton Scattering reaction in Hall C that will allow the precise extraction of the two scalar Generalized Polarizabilities (GPs) of the proton in the region of $Q^2=0.05~(GeV/c)^2$ to $Q^2=0.50~(GeV/c)^2$. The Generalized Polarizabilities are fundamental properties of the proton, that characterize the system's response to an external electromagnetic (EM) field. They describe how easily the charge and magnetization distributions inside the system are distorted by the EM field, mapping out the resulting deformation of the densities in the proton. As such, they reveal unique information regarding the underlying system dynamics and provide a key for decoding the proton structure in terms of the theory of the strong interaction that binds its elementary quark and gluon constituents together. Recent measurements of the proton GPs have challenged the theoretical predictions, particularly in regard to the electric polarizability. The magnetic GP, on the other hand, can provide valuable insight to the competing paramagnetic and diamagnetic contributions in the proton, but it is poorly known within the region where the interplay of these processes is very dynamic and rapidly changing.The unique capabilities of Hall C, namely the high resolution of the spectrometers combined with the ability to place the spectrometers in small angles, will allow to pin down the dynamic signature of the GPs through high precision measurements combined with a fine mapping as a function of $Q^2$. The experimental setup utilizes standard Hall C equipment, as was previously employed in the VCS-I (E12-15-001) experiment, namely the HMS and SHMS spectrometers and a 10 cm liquid hydrogen target. A total of 59 days of unpolarized 75 $\mu A$ electron beam with energy of 1100 MeV (6 days) and 2200 MeV (53 days) is requested for this experiment.
Published: 2023

4. Beam Spin Asymmetry Measurements of Deeply Virtual $\pi^0$ Production with CLAS12

Author: Kim, A., Diehl, S., Joo, K., Kubarovsky, V., Achenbach, P., Akbar, Z., Alvarado, J. S., Armstrong, Whitney R., Atac, H., Avakian, H., Gayoso, C. Ayerbe, Barion, L., Battaglieri, M., Bedlinskiy, I., Benkel, B., Bianconi, A., Biselli, A. S., Bondi, M., Bossù, F., Boiarinov, S., Brinkmann, K. T., Briscoe, W. J., Brooks, W. K., Bueltmann, S., Burkert, V. D., Capobianco, R., Carman, D. S., Carvajal, J. C., Celentano, A., Charles, G., Chatagnon, P., Chesnokov, V., Chetry, T., Ciullo, G., Clary, B., Clash, G., Cole, P. L., Contalbrigo, M., Costantini, G., Crede, V., D'Angelo, A., Dashyan, N., DeVita, R., Defurne, M., Deur, A., Dilks, C., Djalali, C., Dupre, R., Egiyan, H., Ehrhart, M., ElAlaoui, A., ElFassi, L., Fegan, S., Filippi, A., Fogler, C., Gavalian, G., Gilfoyle, G. P., Gosta, G., Girod, F. X., Glazier, D. I., Golubenko, A. A., Gothe, R. W., Guo, L., Hafidi, K., Hakobyan, H., Hattawy, M., Hauenstein, F., Hayward, T. B., Heddle, D., Hobart, A., Holtrop, M., Hung, Yu-Chun, Ilieva, Y., Ireland, D. G., Isupov, E., Jo, H. S., Johnston, R., Joosten, S., Khachatryan, M., Khanal, A., Kim, W., Klimenko, V., Kripko, A., Kuhn, S. E., Lanza, L., Leali, M., Kabir, M. L., Lee, S., Lenisa, P., Li, X., MacGregor, I . J . D., Marchand, D., Mascagna, V., McKinnon, B., Matamoros, D., Migliorati, S., Mineeva, T., Mirazita, M., Mokeev, V., Moran, P., MunozCamacho, C., Naidoo, P., Neupane, K., Nguyen, D., Niccolai, S., Niculescu, G., Osipenko, M., Ouillon, M., Pandey, P., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Paul, S. J., Phelps, W., Pilleux, N., Pokhrel, M., Poudel, J., Price, J. W., Prok, Y., Radic, A., Ramasubramanian, N., Reed, Trevor, Richards, J., Ripani, M., Ritman, J., Rossi, P., Sabatié, F., Salgado, C., Schadmand, S., Schmidt, A., Sharabian, Y. G., Shirokov, E. V., Shrestha, U., Sokhan, D., Sparveris, N., Spreafico, M., Stepanyan, S., Strakovsky, I. I., Strauch, S., Tan, J., Trotta, N., Tyson, R., Ungaro, M., Vallarino, S., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D. P., Wei, X., Wishart, R., Wood, M. H., Yurov, M., Zachariou, N., Zhang, J., Ziegler, V., and Zurek, M.
Subjects: Nuclear Experiment
Abstract: The new experimental measurements of beam spin asymmetry were performed for the deeply virtual exclusive $\pi^0$ production in a wide kinematic region with the photon virtualities $Q^2$ up to 8 GeV$^2$ and the Bjorken scaling variable $x_B$ in the valence regime. The data were collected by the CEBAF Large Acceptance Spectrometer (CLAS12) at Jefferson Lab with longitudinally polarized 10.6 GeV electrons scattered on an unpolarized liquid-hydrogen target. Sizable asymmetry values indicate a substantial contribution from transverse virtual photon amplitudes to the polarized structure functions.The interpretation of these measurements in terms of the Generalized Parton Distributions (GPDs) demonstrates their sensitivity to the chiral-odd GPD $\bar E_T$, which contains information on quark transverse spin densities in unpolarized and polarized nucleons and provides access to the proton's transverse anomalous magnetic moment. Additionally, the data were compared to a theoretical model based on a Regge formalism that was extended to the high photon virtualities., Comment: arXiv admin note: substantial text overlap with arXiv:2210.14557
Published: 2023

5. The solenoidal large intensity device (SoLID) for JLab 12 GeV

Author: Arrington, J, Benesch, J, Camsonne, A, Caylor, J, Chen, J-P, Dusa, S Covrig, Emmert, A, Evans, G, Gao, H, Hansen, J-O, Huber, GM, Joosten, S, Khachatryan, V, Liyanage, N, Meziani, Z-E, Nycz, M, Peng, C, Paolone, M, Seay, W, Souder, PA, Sparveris, N, Spiesberger, H, Tian, Y, Voutier, E, Xie, J, Xiong, W, Ye, Z-Y, Ye, Z, Zhang, J, Zhao, Z-W, Zheng, X, and Collaboration, For the Jefferson Lab SoLID
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, quantum chromodynamics, 3D imaging, transverse momentum distributions, parity violation deep inelastic scattering, standard model, proton gluonic gravitational form factors, J/& psi, electro- and photoproduction, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: The solenoidal large intensity device (SoLID) is a new experimental apparatus planned for Hall A at the Thomas Jefferson National Accelerator Facility (JLab). SoLID will combine large angular and momentum acceptance with the capability to handle very high data rates at high luminosity. With a slate of approved high-impact physics experiments, SoLID will push JLab to a new limit at the QCD intensity frontier that will exploit the full potential of its 12 GeV electron beam. In this paper, we present an overview of the rich physics program that can be realized with SoLID, which encompasses the tomography of the nucleon in 3D momentum space from semi-inclusive deep inelastic scattering, expanding the phase space in the search for new physics and novel hadronic effects in parity-violating DIS, a precision measurement of J/ψ production at threshold that probes the gluon field and its contribution to the proton mass, tomography of the nucleon in combined coordinate and momentum space with deep exclusive reactions, and more. To meet the challenging requirements, the design of SoLID described here takes full advantage of recent progress in detector, data acquisition and computing technologies. In addition, we outline potential experiments beyond the currently approved program and discuss the physics that could be explored should upgrades of CEBAF become a reality in the future.
Published: 2023

6. First Measurement of the EMC effect in B10 and B11

Author: Karki, A, Biswas, D, Gonzalez, FA, Henry, W, Morean, C, Nadeeshani, A, Sun, A, Abrams, D, Ahmed, Z, Aljawrneh, B, Alsalmi, S, Ambrose, R, Androic, D, Armstrong, W, Arrington, J, Asaturyan, A, Assumin-Gyimah, K, Gayoso, C Ayerbe, Bandari, A, Bane, J, Barrow, J, Basnet, S, Berdnikov, V, Bhatt, H, Bhetuwal, D, Boeglin, WU, Bosted, P, Brash, E, Bukhari, MHS, Chen, H, Chen, JP, Chen, M, Christy, ME, Covrig, S, Craycraft, K, Danagoulian, S, Day, D, Diefenthaler, M, Dlamini, M, Dunne, J, Duran, B, Dutta, D, Elliott, C, Ent, R, Fenker, H, Fomin, N, Fuchey, E, Gaskell, D, Gautam, TN, Hansen, JO, Hauenstein, F, Hernandez, AV, Horn, T, Huber, GM, Jones, MK, Joosten, S, Kabir, ML, Kalantarians, N, Keppel, C, Khanal, A, King, PM, Kinney, E, Ko, HS, Kohl, M, Lashley-Colthirst, N, Li, S, Li, WB, Liyanage, AH, Mack, D, Malace, S, Markowitz, P, Matter, J, Meekins, D, Michaels, R, Mkrtchyan, A, Mkrtchyan, H, Nanda, S, Nguyen, D, Niculescu, G, Niculescu, I, Nuruzzaman, Pandey, B, Park, S, Pooser, E, Puckett, AJR, Rehfuss, M, Reinhold, J, Santiesteban, N, Sawatzky, B, Smith, GR, Szumila-Vance, H, Tadepalli, AS, Tadevosyan, V, Trotta, R, Wood, SA, Yero, C, and Zhang, J
Subjects: Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Nuclear and plasma physics
Abstract: The nuclear dependence of the inclusive inelastic electron scattering cross section (the EMC effect) has been measured for the first time in B10 and B11. Previous measurements of the EMC effect in A≤12 nuclei showed an unexpected nuclear dependence; B10 and B11 were measured to explore the EMC effect in this region in more detail. Results are presented for Be9, B10, B11, and C12 at an incident beam energy of 10.6 GeV. The EMC effect in the boron isotopes was found to be similar to that for Be9 and C12, yielding almost no nuclear dependence in the EMC effect in the range A=4-12. This represents important new data supporting the hypothesis that the EMC effect depends primarily on the local nuclear environment due to the cluster structure of these nuclei.
Published: 2023

7. Precision studies of QCD in the low energy domain of the EIC

Author: Burkert, VD, Elouadrhiri, L, Afanasev, A, Arrington, J, Contalbrigo, M, Cosyn, W, Deshpande, A, Glazier, DI, Ji, X, Liuti, S, Oh, Y, Richards, D, Satogata, T, Vossen, A, Abdolmaleki, H, Albataineh, A, Aidala, CA, Alexandrou, C, Avagyan, H, Bacchetta, A, Baker, M, Benmokhtar, F, Bernauer, JC, Bissolotti, C, Briscoe, W, Byers, D, Cao, Xu, Carlson, CE, Cichy, K, Cloet, IC, Cocuzza, C, Cole, PL, Constantinou, M, Courtoy, A, Dahiyah, H, Dehmelt, K, Diehl, S, Dilks, C, Djalali, C, Dupré, R, Dusa, SC, El-Bennich, B, Fassi, L El, Frederico, T, Freese, A, Gamage, BR, Gamberg, L, Ghoshal, RR, Girod, FX, Goncalves, VP, Gotra, Y, Guo, FK, Guo, X, Hattawy, M, Hatta, Y, Hayward, T, Hen, O, Huber, GM, Hyde, C, Isupov, EL, Jacak, B, Jacobs, W, Jentsch, A, Ji, CR, Joosten, S, Kalantarians, N, Kang, Z, Kim, A, Klein, S, Kriesten, B, Kumano, S, Kumar, A, Kumericki, K, Kuchera, M, Lai, WK, Li, Jin, Li, Shujie, Li, W, Li, X, Lin, H-W, Liu, KF, Liu, Xiaohui, Markowitz, P, Mathieu, V, McEneaney, M, Mekki, A, de Melo, JPBC, Meziani, ZE, Milner, R, Mkrtchyan, H, Mochalov, V, Mokeev, V, Morozov, V, Moutarde, H, Murray, M, Mtingwa, S, Nadel-Turonski, P, Okorokov, VA, Onyie, E, and Pappalardo, LL
Subjects: Particle and High Energy Physics, Physical Sciences, Affordable and Clean Energy, EIC, QCD, Spin, Mass, Pressure, GPDs, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: This White Paper aims at highlighting the important benefits in the science reach of the EIC. High luminosity operation is generally desirable, as it enables producing and harvesting scientific results in a shorter time period. It becomes crucial for programs that would require many months or even years of operation at lower luminosity.
Published: 2023

8. Measured proton electromagnetic structure deviates from theoretical predictions

Author: Li, R., Sparveris, N., Atac, H., Jones, M. K., Paolone, M., Akbar, Z., Gayoso, C. Ayerbe, Berdnikov, V., Biswas, D., Boer, M., Camsonne, A., Chen, J. -P., Diefenthaler, M., Duran, B., Dutta, D., Gaskell, D., Hansen, O., Hauenstein, F., Heinrich, N., Henry, W., Horn, T., Huber, G. M., Jia, S., Joosten, S., Karki, A., Kay, S. J. D., Kumar, V., Li, X., Li, W. B., Liyanage, A. H., Malace, S., Markowitz, P., McCaughan, M., Meziani, Z. -E., Mkrtchyan, H., Morean, C., Muhoza, M., Narayan, A., Pasquini, B., Rehfuss, M., Sawatzky, B., Smith, G. R., Smith, A., Trotta, R., Yero, C., Zheng, X., and Zhou, J.
Subjects: Nuclear Experiment, Nuclear Theory
Abstract: The visible world is founded on the proton, the only composite building block of matter that is stable in nature. Consequently, understanding the formation of matter relies on explaining the dynamics and the properties of the proton's bound state.A fundamental property of the proton involves the response of the system to an external electromagnetic field. It is characterized by the electromagnetic polarizabilities that describe how easily the charge and magnetization distributions inside the system are distorted by the electromagnetic field. Moreover, the generalized polarizabilities map out the resulting deformation of the densities in a proton subject to an electromagnetic field. They disclose essential information about the underlying system dynamics and provide a key for decoding the proton structure in terms of the theory of the strong interaction that binds its elementary quark and gluon constituents. Of particular interest is a puzzle in the electric generalized polarizability of the proton that remains unresolved for two decades. Here we report measurements of the proton's electromagnetic generalized polarizabilities at low four-momentum transfer squared. We show evidence of an anomaly to the behaviour of the proton's electric generalized polarizability that contradicts the predictions of nuclear theory and derive its signature in the spatial distribution of the induced polarization in the proton. The reported measurements suggest the presence of a new, not-yet-understood dynamical mechanism in the proton and present notable challenges to the nuclear theory.
Published: 2022
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9. ATHENA Detector Proposal -- A Totally Hermetic Electron Nucleus Apparatus proposed for IP6 at the Electron-Ion Collider

Author: ATHENA Collaboration, Adam, J., Adamczyk, L., Agrawal, N., Aidala, C., Akers, W., Alekseev, M., Allen, M. M., Ameli, F., Angerami, A., Antonioli, P., Apadula, N. J., Aprahamian, A., Armstrong, W., Arratia, M., Arrington, J. R., Asaturyan, A., Aschenauer, E. C., Augsten, K., Aune, S., Bailey, K., Baldanza, C., Bansal, M., Barbosa, F., Barion, L., Barish, K., Battaglieri, M., Bazilevsky, A., Behera, N. K., Berdnikov, V., Bernauer, J., Berriaud, C., Bhasin, A., Bhattacharya, D. S., Bielcik, J., Bielcikova, J., Bissolotti, C., Boeglin, W., Bondì, M., Borri, M., Bossu, F., Bouyjou, F., Brandenburg, J. D., Bressan, A., Brooks, M., Bueltmann, S. L., Byer, D., Caines, H., Sanchez, M. Calderon de la Barca, Calvelli, V., Camsonne, A., Cappelli, L., Capua, M., Castro, M., Cavazza, D., Cebra, D., Celentano, A., Chakaberia, I., Chan, B., Chang, W., Chartier, M., Chatterjee, C., Chen, D., Chen, J., Chen, K., Chen, Z., Chetri, H., Chiarusi, T., Chiosso, M., Chu, X., Chwastowski, J. J., Cicala, G., Cisbani, E., Cline, E., Cloet, I., Colella, D., Contalbrigo, M., Contin, G., Corliss, R., Corrales-Morales, Y., Crafts, J., Crawford, C., Cruz-Torres, R., D'Ago, D., D'Angelo, A., D'Hose, N., Dainton, J., Torre, S. Dalla, Dasgupta, S. S., Dash, S., Dashyan, N., Datta, J., Daugherity, M., De Vita, R., Deconinck, W., Defurne, M., Dehmelt, K., Del Dotto, A., Delcarro, F., Dellacasa, G., Demiroglu, Z. S., Deptuch, G. W., Desai, V., Deshpande, A., Devereaux, K., Dhillon, R., Di Salvo, R., Dilks, C., Dixit, D., Dobbs, S., Dong, X., Drachenberg, J., Drees, A., Dupre, R., Durham, M., Dzhygadlo, R., Fassi, L. El, Elia, D., Epple, E., Esha, R., Evdokimov, O., Eyser, O., Falchieri, D., Fan, W., Fantini, A., Fatemi, R., Fazio, S., Fegan, S., Filippi, A., Fox, H., Francisco, A., Freeze, A., Furletov, S., Furletova, Y., Gal, C., Gardner, S., Garg, P., Gaskell, D., Gates, K., Gericke, M. T. W., Geurts, F., Ghosh, C., Giacalone, M., Giacomini, F., Gilchrist, S., Glazier, D., Gnanvo, K., Gonella, L., Greiner, L. C., Guerrini, N., Guo, L., Gupta, A., Gupta, R., Guryn, W., He, X., Hemmick, T., Heppelmann, S., Higinbotham, D., Hoballah, M., Hoghmrtsyan, A., Hohlmann, M., Horn, T., Hornidge, D., Huang, H. Z., Hyde, C. E., Iapozzuto, P., Idzik, M., Jacak, B. V., Jadhav, M., Jain, S., Jena, C., Jentsch, A., Ji, Y., Ji, Z., Jia, J., Jones, P. G., Jones, R. W. I., Joosten, S., Joshi, S., Kabir, L., Kalicy, G., Karyan, G., Kashyap, V. K. S., Kawall, D., Ke, H., Kelsey, M., Kim, J., Kiryluk, J., Kiselev, A., Klein, S. R., Klest, H., Kochar, V., Korsch, W., Kosarzewski, L., Kotzinian, A., Krizek, F., Kumar, A., Kumar, K. S., Kumar, L., Kumar, R., Kumar, S., Kunnath, A., Kushawaha, N., Lacey, R., Lai, Y. S., Lalwani, K., Landgraf, J., Lanza, L., Lattuada, D., Lavinsky, M., Lee, J. H., Lee, S. H., Lemmon, R., Lestone, A., Lewis, N., Li, H., Li, S., Li, W., Li, X., Liang, X., Ligonzo, T., Lin, T., Liu, J., Liu, K., Liu, M., Livingston, K., Liyanage, N., Ljubicic, T., Long, O., Lukow, N., Ma, Y., Mammei, J., Mammoliti, F., Mamo, K., Mandjavidze, I., Maple, S., Marchand, D., Margotti, A., Markert, C., Markowitz, P., Marshall, T., Martin, A., Marukyan, H., Mastroserio, A., Mathew, S., Mayilyan, S., Mayri, C., McEneaney, M., Mei, Y., Meng, L., Meot, F., Metcalfe, J., Meziani, Z. -E., Mihir, P., Milton, R., Mirabella, A., Mirazita, M., Mkrtchyan, A., Mkrtchyan, H., Mohanty, B., Mondal, M., Morreale, A., Movsisyan, A., Muenstermann, D., Mukherjee, A., Camacho, C. Munoz, Murray, M. J., Mustafa, H., Myska, M., Nachman, B. P., Nagai, K., Naik, R., Naim, J. P., Nam, J., Nandi, B., Nappi, E., Nasim, Md., Neff, D., Neiret, D., Newman, P. R., Nguyen, M., Niccolai, S., Nie, M., Noferini, F., Norman, J., Noto, F., Nunes, A. S., O'Connor, T., Odyniec, G., Okorokov, V. A., Osipenko, M., Page, B., Palatchi, C., Palmer, D., Palni, P., Pandey, S., Panzieri, D., Park, S., Paschke, K., Pastore, C., Patra, R. N., Paul, A., Paul, S., Pecar, C., Peck, A., Pegg, I., Pellegrino, C., Peng, C., Pentchev, L., Perrino, R., Piotrzkowski, K., Polakovic, T., Ploskon, M., Posik, M., Prasad, S., Preghenella, R., Priens, S., Prifti, E., Przybycien, M., Pujahari, P., Quintero, A., Radici, M., Radhakrishnan, S. K., Rahman, S., Rathi, S., Raue, B., Reed, R., Reimer, P., Reinhold, J., Renner, E., Rignanese, L., Ripani, M., Rizzo, A., Romanov, D., Roy, A., Rubini, N., Ruspa, M., Ruan, L., Sabatie, F., Sadhukhan, S., Sahoo, N., Sahu, P., Samuel, D., Sarkar, A., Sarsour, M., Schmidke, W., Schmookler, B., Schwarz, C., Schwiening, J., Scott, M., Sedgwick, I., Segreti, M., Sekula, S., Seto, R., Shah, N., Shahinyan, A., Sharma, D., Sharma, N., Sichtermann, E. P., Signori, A., Singh, A., Singh, B. K., Singh, S. N., Smirnov, N., Sokhan, D., Soltz, R., Sondheim, W., Spinali, S., Stacchi, F., Staszewski, R., Stepanov, P., Strazzi, S., Stroe, I. R., Sun, X., Surrow, B., Sweger, Z., Symons, T. J., Tadevosyan, V., Tang, A., Tassi, E., Teodorescu, L., Tessarotto, F., Thomas, D., Thomas, J. H., Toll, T., Tomasek, L., Torales-Acosta, F., Tribedy, P., Triloki, Tripathi, V., Trotta, R., Trzebiński, M., Trzeciak, B. A., Tsai, O., Tu, Z., Turrisi, R., Tuve, C., Ullrich, T., Urciuoli, G. M., Valentini, A., Vallarino, S., Vandenbroucke, M., Vanek, J., Vino, G., Volpe, G., Voskanyan, H., Vossen, A., Voutier, E., Wang, G., Wang, Y., Watts, D., Wickramaarachchi, N., Wilson, F., Wong, C. -P., Wu, X., Wu, Y., Xie, J., Xu, Q. -H., Xu, Z., Xu, Z. W., Yang, C., Yang, Q., Yang, Y., Ye, Z., Yi, L., Yin, Z., Yurov, M., Zachariou, N., Zhang, J., Zhang, Y., Zhang, Z., Zhao, Y., Zhao, Y. X., Zhao, Z., Zheng, L., and Zurek, M.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract: ATHENA has been designed as a general purpose detector capable of delivering the full scientific scope of the Electron-Ion Collider. Careful technology choices provide fine tracking and momentum resolution, high performance electromagnetic and hadronic calorimetry, hadron identification over a wide kinematic range, and near-complete hermeticity. This article describes the detector design and its expected performance in the most relevant physics channels. It includes an evaluation of detector technology choices, the technical challenges to realizing the detector and the R&D required to meet those challenges.
Published: 2022

10. Solid State Detectors and Tracking for Snowmass

Author: Affolder, A., Apresyan, A., Worm, S., Albrow, M., Ally, D., Ambrose, D., Anderssen, E., Apadula, N., Asenov, P., Armstrong, W., Artuso, M., Barbier, A., Barletta, P., Bauerdick, L., Berry, D., Bomben, M., Boscardin, M., Brau, J., Brooks, W., Breidenbach, M., Buckley, J., Cairo, V., Caputo, R., Carpenter, L., Centis-Vignali, M., Cerullo, M., Collu, A., Chlebana, F., Dalla-Betta, G. -F., Demarteau, M., Deptuch, G., Di Petrillo, K., D'Amen, G., Dragone, A., Fourches, N. T., Garcia-Sciveres, M., Giacomini, G., Gingu, C., Graf, N., Grace, C., Griso, S., Greiner, L., Haber, C., Haller, G., Harris, K., Heim, T., Heinz, U., Heller, R., Hedges, M. T., Herbst, R., Hoeferkamp, M. R., Holmes, T., Holland, S. E., Hsu, S. -C., Islam, R., Jadhav, M., Jindariani, S., Joosten, S., Jung, A., Karmarkar, S., Kenney, C., Kierans, C., Kim, J., Kim, S., Klein, S., Koshy, A., Krizka, K., Lai, A., Lee, L., Linssen, L., Lipton, R., Liu, T., Madrid, C., Mahajan, T., Markiewicz, T., Markovic, B., Mazza, S., Mazziotta, M., Mei, Y., Merkel, P., Metcalfe, J., Meziani, Z. -E., Minns, A., Moscatelli, F., Murat, P., Muth, J., Nachman, B., Nahn, S., Narain, M., Narayanan, E. A., Nelson, T., Nielsen, J., Oktyabrsky, S., Ott, J., Palomo, F. R., Passeri, D., Patti, R., Peltola, T., Pena, C., Peng, C., Renard, C., Reimer, P., Rogan, C., Rota, L., Sadrozinski, H., Segal, J., Schwartzman, A., Schumm, B., Scott, M., Seidel, S., Seiden, A., Sekely, B., Shi, X., Sichtermann, E., Sinev, N., Sonneveld, J., Spiegel, L., Steinhebel, A., Strom, D., Sultan, D. M. S., Sumant, A., Tokranov, V., Tricoli, A., Trischuk, W., Tumasyan, A., Uplegger, L., Vernieri, C., Wang, H., Wagenknecht, P., Weber, H., Xie, S., Yakimov, M., Ye, Z., Young, C., and Zurek, M.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: Tracking detectors are of vital importance for collider-based high energy physics (HEP) experiments. The primary purpose of tracking detectors is the precise reconstruction of charged particle trajectories and the reconstruction of secondary vertices. The performance requirements from the community posed by the future collider experiments require an evolution of tracking systems, necessitating the development of new techniques, materials and technologies in order to fully exploit their physics potential. In this article we summarize the discussions and conclusions of the 2022 Snowmass Instrumentation Frontier subgroup on Solid State and Tracking Detectors (Snowmass IF03)., Comment: for the Snowmass Instrumentation Frontier Solid State Detector and Tracking community
Published: 2022

11. Observation of azimuth-dependent suppression of hadron pairs in electron scattering off nuclei

Author: Paul, S. J., Moran, S., Arratia, M., Alaoui, A. El, Hakobyan, H., Brooks, W., Amaryan, M. J., Armstrong, W. R., Atac, H., Baashen, L., Baltzell, N. A., Barion, L., Bashkanov, M., Battaglieri, M., Bedlinskiy, I., Benkel, B., Benmokhtar, F., Bianconi, A., Biondo, L., Biselli, A. S., Bondi, M., Bossu, F., Boiarinov, S., Brinkmann, K. Th., Briscoe, W. J., Bulumulla, D., Burkert, V. D., Capobianco, R., Carman, D. S., Celentano, A., Chesnokov, V., Chetry, T., Ciullo, G., Cole, P. L., Contalbrigo, M., Costantini, G., D'Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Diehl, S., Dilks, C., Djalali, C., Dupre, R., Egiyan, H., Fassi, L. El, Eugenio, P., Fegan, S., Filippi, A., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Golubenko, A. A., Gosta, G., Gothe, R. W., Griffioen, K. A., Guidal, M., Hattawy, M., Hayward, T. B., Heddle, D., Hobart, A., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jo, H. S., Johnston, R., Joo, K., Joosten, S., Keller, D., Khanal, A., Khandaker, M., Kim, W., Kripko, A., Kubarovsky, V., Lagerquist, V., Lanza, L., Leali, M., Lee, S., Lenisa, P., Li, X., Livingston, K., MacGregor, I. J. D., Marchand, D., Mascagna, V., McKinnon, B., Meziani, Z. E., Migliorati, S., Milner, R. G., Mineeva, T., Mirazita, M., Mokeev, V. I., Moran, P., Camacho, C. Munoz, Neupane, K., Nguyen, D., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Pandey, P., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Phelps, W., Pilleux, N., Pocanic, D., Pogorelko, O., Pokhrel, M., Poudel, J., Price, J. W., Prok, Y., Raue, B. A., Reed, T., Ripani, M., Rosner, G., Sabatie, F., Salgado, C., Schmidt, A., Schumacher, R. A., Sharabian, Y. G., Shirokov, E. V., Shrestha, U., Simmerling, P., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Tan, J. A., Tyson, R., Ungaro, M., Vallarino, S., Venturelli, L., Voskanyan, H., Voutier, E., Wei, X., Wishart, R., Wood, M. H., Zachariou, N., Zhao, Z. W., Ziegler, V., and Zurek, M.
Subjects: Nuclear Experiment
Abstract: We present the first measurement of di-hadron angular correlations in electron-nucleus scattering. The data were taken with the CLAS detector and a 5.0 GeV electron beam incident on deuterium, carbon, iron, and lead targets. Relative to deuterium, the nuclear yields of charged-pion pairs show a strong suppression for azimuthally opposite pairs, no suppression for azimuthally nearby pairs, and an enhancement of pairs with large invariant mass. These effects grow with increased nuclear size. The data are qualitatively described by the GiBUU model, which suggests that hadrons form near the nuclear surface and undergo multiple-scattering in nuclei. These results show that angular correlation studies can open a new way to elucidate how hadrons form and interact inside nuclei, Comment: 6 pages, 4 figures
Published: 2022
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12. Determining the Proton's Gluonic Gravitational Form Factors

Author: Duran, B., Meziani, Z. -E., Joosten, S., Jones, M. K., Prasad, S., Peng, C., Armstrong, W., Atac, H., Chudakov, E., Bhatt, H., Bhetuwal, D., Boer, M., Camsonne, A., Chen, J. -P., Dalton, M. M., Deokar, N., Diefenthaler, M., Dunne, J., Fassi, L. El, Fuchey, E., Gao, H., Gaskell, D., Hansen, O., Hauenstein, F., Higinbotham, D., Jia, S., Karki, A., Keppel, C., King, P., Ko, H. S., Li, X., Li, R., Mack, D., Malace, S., McCaughan, M., McClellan, R. E., Michaels, R., Meekins, D., Paolone, M., Pentchev, L., Pooser, E., Puckett, A., Radloff, R., Rehfuss, M., Reimer, P. E., Riordan, S., Sawatzky, B., Smith, A., Sparveris, N., Szumila-Vance, H., Wood, S., Xie, J., Ye, Z., Yero, C., and Zhao, Z.
Subjects: Nuclear Experiment, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract: The proton is one of the main building blocks of all visible matter in the universe. Among its intrinsic properties are its electric charge, mass, and spin. These emerge from the complex dynamics of its fundamental constituents, quarks and gluons, described by the theory of quantum chromodynamics (QCD). Using electron scattering, its electric charge and spin, shared among the quark constituents, have been the topic of active investigation. An example is the novel precision measurement of the proton's electric charge radius. In contrast, little is known about the proton's inner mass density, dominated by the energy carried by the gluons, which are hard to access through electron scattering since gluons carry no electromagnetic charge. Here, we chose to probe this gluonic gravitational density using a small color dipole, the $J/\psi$ particle, through its threshold photoproduction. From our data, we determined, for the first time, the proton's gluonic gravitational form factors. We used a variety of models and determined, in all cases, a mass radius that is notably smaller than the electric charge radius. In some cases, the determined radius, although model dependent, is in excellent agreement with first-principle predictions from lattice QCD. This work paves the way for a deeper understanding of the salient role of gluons in providing gravitational mass to visible matter., Comment: Accepted for publication
Published: 2022
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13. First Measurement of the EMC Effect in $^{10}$B and $^{11}$B

Author: Karki, A., Biswas, D., Gonzalez, F. A., Henry, W., Morean, C., Nadeeshani, A., Sun, A., Abrams, D., Ahmed, Z., Aljawrneh, B., Alsalmi, S., Ambrose, R., Androic, D., Armstrong, W., Arrington, J., Asaturyan, A., Assumin-Gyimah, K., Gayoso, C. Ayerbe, Bandari, A., Bane, J., Barrow, J., Basnet, S., Berdnikov, V., Bhatt, H., Bhetuwal, D., Boeglin, W. U., Bosted, P., Brash, E., Bukhari, M. H. S., Chen, H., Chen, J. P., Chen, M., Christy, M. E., Covrig, S., Craycraft, K., Danagoulian, S., Day, D., Diefenthaler, M., Dlamini, M., Dunne, J., Duran, B., Dutta, D., Elliott, C., Ent, R., Fenker, H., Fomin, N., Fuchey, E., Gaskell, D., Gautam, T. N., Hansen, J. O., Hauenstein, F., Hernandez, A. V., Horn, T., Huber, G. M., Jones, M. K., Joosten, S., Kabir, M. L., Kalantarians, N., Keppel, C., Khanal, A., King, P. M., Kinney, E., Ko, H. S., Kohl, M., Lashley-Colthirst, N., Li, S., Li, W. B., Liyanage, A. H., Mack, D., Malace, S., Markowitz, P., Matter, J., Meekins, D., Michaels, R., Mkrtchyan, A., Mkrtchyan, H., Nanda, S., Nguyen, D., Niculescu, G., Niculescu, I., Nuruzzaman, Pandey, B., Park, S., Pooser, E., Puckett, A. J. R., Rehfuss, M., Reinhold, J., Santiesteban, N., Sawatzky, B., Smith, G. R., Szumila-Vance, H., Tadepalli, A. S., Tadevosyan, V., Trotta, R., Wood, S. A., Yero, C., and Zhang, J.
Subjects: Nuclear Experiment
Abstract: The nuclear dependence of the inclusive inelastic electron scattering cross section (the EMC effect) has been measured for the first time in $^{10}$B and $^{11}$B. Previous measurements of the EMC effect in $A \leq 12$ nuclei showed an unexpected nuclear dependence; $^{10}$B and $^{11}$B were measured to explore the EMC effect in this region in more detail. Results are presented for $^9$Be, $^{10}$B, $^{11}$B, and $^{12}$C at an incident beam energy of 10.6~GeV. The EMC effect in the boron isotopes was found to be similar to that for $^9$Be and $^{12}$C, yielding almost no nuclear dependence in the EMC effect in the range $A=4-12$. This represents important, new data supporting the hypothesis that the EMC effect depends primarily on the local nuclear environment due to the cluster structure of these nuclei., Comment: To appear in PRC
Published: 2022

14. Constraints on the onset of color transparency from quasi-elastic $^{12}$C$(e,e'p)$ up to $Q^2=\,14.2\,$(GeV$/c)^2$

Author: Bhetuwal, D., Matter, J., Szumila-Vance, H., Gayoso, C. Ayerbe, Kabir, M. L., Dutta, D., Ent, R., Abrams, D., Ahmed, Z., Aljawrneh, B., Alsalmi, S., Ambrose, R., Androic, D., Armstrong, W., Asaturyan, A., Assumin-Gyimah, K., Bandari, A., Basnet, S., Berdnikov, V., Bhatt, H., Biswas, D., Boeglin, W. U., Bosted, P., Brash, E., Bukhari, M. H. S., Chen, H., Chen, J. P., Chen, M., Christy, E. M., Covrig, S., Craycraft, K., Danagoulian, S., Day, D., Diefenthaler, M., Dlamini, M., Dunne, J., Duran, B., Evans, R., Fenker, H., Fomin, N., Fuchey, E., Gaskell, D., Gautam, T. N., Gonzalez, F. A., Hansen, J. O., Hauenstein, F., Hernandez, A. V., Horn, T., Huber, G. M., Jones, M. K., Joosten, S., Karki, A., Keppel, C., Khanal, A., King, P. M., Kinney, E., Ko, H. S., Kohl, M., Lashley-Colthirst, N., Li, S., Li, W. B., Liyanage, A. H., Mack, D., Malace, S., Markowitz, P., Meekins, D., Michaels, R., Mkrtchyan, A., Mkrtchyan, H., Nazeer, S. J., Nanda, S., Niculescu, G., Niculescu, I., Nguyen, D., Nuruzzaman, Pandey, B., Park, S., Pooser, E., Puckett, A., Rehfuss, M., Reinhold, J., Santiesteban, N., Sawatzky, B., Smith, G. R., Sun, A., Tadevosyan, V., Trotta, R., Wood, S. A., Yero, C., and Zhang, J.
Subjects: Nuclear Experiment
Abstract: Quasi-elastic scattering on $^{12}$C$(e,e'p)$ was measured in Hall C at Jefferson Lab for space-like 4-momentum transfer squared $Q^2$ in the range of 8--14.2\,(GeV/$c$)$^2$ with proton momenta up to 8.3\,GeV/$c$. The experiment was carried out in the upgraded Hall C at Jefferson Lab. It used the existing high momentum spectrometer and the new super high momentum spectrometer to detect the scattered electrons and protons in coincidence. The nuclear transparency was extracted as the ratio of the measured yield to the yield calculated in the plane wave impulse approximation. Additionally, the transparency of the $1s_{1/2}$ and $1p_{3/2}$ shell protons in $^{12}$C was extracted, and the asymmetry of the missing momentum distribution was examined for hints of the quantum chromodynamics prediction of Color Transparency. All of these results were found to be consistent with traditional nuclear physics and inconsistent with the onset of Color Transparency.
Published: 2022
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15. Exclusive $\pi^{-}$ Electroproduction off the Neutron in Deuterium in the Resonance Region

Author: Tian, Y., Gothe, R. W., Mokeev, V. I., Hollis, G., Amaryan, M. J., Armstrong, W. R., Atac, H., Avakian, H., Barion, L., Battaglieri, M., Bedlinskiy, I., Benkel, B., Benmokhtar, F., Bianconi, A., Biondo, L., Biselli, A., Bossù, F., Boiarinov, S., Bondì, M., Brinkmann, K. T., Briscoe, W. J., Bueltmann, S., Bulumulla, D., Burkert, V. D., Capobianco, R., Carman, D. S., Carvajal, J. C., Celentano, A., Chesnokov, V., Chetry, T., Ciullo, G., Clash, G., Cole, P. L., Contalbrigo, M., Costantini, G., D'Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Eugenio, P., Fegan, S., Filippi, A., Gavalian, G., Gilfoyle, G. P., Girod, F. X., Golubenko, A. A., Gosta, G., Griffioen, K., Guidal, M., Hakobyan, H., Hattawy, M., Hayward, T. B., Hobart, A., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jenkins, D., Jo, H. S., Joo, K., Joosten, S., Keller, D., Khanal, A., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Kripko, A., Kubarovsky, V., Lagerquist, V., Lanza, L., Leali, M., Lenisa, P., Livingston, K., MacGregor, I. . J . D., Marchand, D., Marsicano, L., Mascagna, V., McKinnon, B., Migliorati, S., Mineeva, T., Mirazita, M., Camacho, C. Munoz, Nadel-Turonski, P., Naidoo, P., Neupane, K., Newton, J., Niccolai, S., Nicol, M., Niculescu, G., Osipenko, M., Pandey, P., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Park, K., Pasyuk, E., Paul, S. J., Phelps, W., Pilleux, N., Počanić, D., Pogorelko, O., Poudel, J., Price, J. W., Prok, Y., Reed, T., Ripani, M., Ritman, J., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Schadmand, S., Schmidt, A., Schumacher, R. A., Shirokov, E. V., Shrestha, U., Simmerling, P., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Tyson, R., Ungaro, M., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D. P., Wei, K., Wei, X., Wood, M. H., Yale, B., Zachariou, N., and Zhang, J.
Subjects: Nuclear Experiment
Abstract: New results for the exclusive and quasi-free cross sections off neutrons bound in deuterium ${\gamma}_vn(p) \rightarrow p{\pi}^{-} (p)$ are presented over a wide final state hadron angle range with a kinematic coverage of the invariant mass ($W$) up to 1.825 GeV and the virtual photon four-momentum transfer squared ($Q^{2}$) from 0.4 to 1.0 GeV$^2$. The exclusive structure functions were extracted and their Legendre moments were obtained. Final-state-interaction contributions have been kinematically separated from the extracted quasi-free cross sections off bound neutrons solely based on the analysis of the experimental data. These new results will serve as long-awaited input for phenomenological analyses to extract the $Q^{2}$ evolution of previously unavailable $n \to N^{*}$ electroexcitation amplitudes and to improve state-of-the-art models of neutrino scattering off nuclei by augmenting the already available results from free protons., Comment: The author list has been updated
Published: 2022
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16. The present and future of QCD

Author: Achenbach, P., Adhikari, D., Afanasev, A., Afzal, F., Aidala, C.A., Al-bataineh, A., Almaalol, D.K., Amaryan, M., Androić, D., Armstrong, W.R., Arratia, M., Arrington, J., Asaturyan, A., Aschenauer, E.C., Atac, H., Avakian, H., Averett, T., Ayerbe Gayoso, C., Bai, X., Barish, K.N., Barnea, N., Basar, G., Battaglieri, M., Baty, A.A., Bautista, I., Bazilevsky, A., Beattie, C., Behera, S.C., Bellini, V., Bellwied, R., Benesch, J.F., Benmokhtar, F., Bernardes, C.A., Bernauer, J.C., Bhatt, H., Bhatta, S., Boer, M., Boettcher, T.J., Bogacz, S.A., Bossi, H.J., Brandenburg, J.D., Brash, E.J., Briceño, R.A., Briscoe, W.J., Brodsky, S.J., Brown, D.A., Burkert, V.D., Caines, H., Cali, I.A., Camsonne, A., Carman, D.S., Caylor, J., Cerci, D.S., Cerci, S., Chamizo Llatas, M., Chatterjee, S., Chen, J.P., Chen, Y., Chen, Y.-C., Chien, Y.-T., Chou, P.-C., Chu, X., Chudakov, E., Cline, E., Cloët, I.C., Cole, P.L., Connors, M.E., Constantinou, M., Cosyn, W., Covrig Dusa, S., Cruz-Torres, R., D'Alesio, U., da Silva, C., Davoudi, Z., Dean, C.T., Dean, D.J., Demarteau, M., Deshpande, A., Detmold, W., Deur, A., Devkota, B.R., Dhital, S., Diefenthaler, M., Dobbs, S., Döring, M., Dong, X., Dotel, R., Dow, K.A., Downie, E.J., Drachenberg, J.L., Dumitru, A., Dunlop, J.C., Dupre, R., Durham, J.M., Dutta, D., Edwards, R.G., Ehlers, R.J., El Fassi, L., Elaasar, M., Elouadrhiri, L., Engelhardt, M., Ent, R., Esumi, S., Evdokimov, O., Eyser, O., Fanelli, C., Fatemi, R., Fernando, I.P., Flor, F.A., Fomin, N., Frawley, A.D., Frederico, T., Fries, R.J., Gal, C., Gamage, B.R., Gamberg, L., Gao, H., Gaskell, D., Geurts, F., Ghandilyan, Y., Ghimire, N., Gilman, R., Gleason, C., Gnanvo, K., Gothe, R.W., Greene, S.V., Grießhammer, H.W., Grossberndt, S.K., Grube, B., Hackett, D.C., Hague, T.J., Hakobyan, H., Hansen, J.-O., Hatta, Y., Hattawy, M., Havener, L.B., Hen, O., Henry, W., Higinbotham, D.W., Hobbs, T.J., Hodges, A.M., Holmstrom, T., Hong, B., Horn, T., Howell, C.R., Huang, H.Z., Huang, M., Huang, S., Huber, G.M., Hyde, C.E., Isupov, E.L., Jacobs, P.M., Jalilian-Marian, J., Jentsch, A., Jheng, H., Ji, C.-R., Ji, X., Jia, J., Jones, D.C., Jones, M.K., Joosten, S., Kalantarians, N., Kalicy, G., Kang, Z.B., Karthein, J.M., Keller, D., Keppel, C., Khachatryan, V., Kharzeev, D.E., Kim, H., Kim, M., Kim, Y., King, P.M., Kinney, E., Klein, S.R., Ko, H.S., Koch, V., Kohl, M., Kovchegov, Y.V., Krintiras, G.K., Kubarovsky, V., Kuhn, S.E., Kumar, K.S., Kutz, T., Lajoie, J.G., Lauret, J., Lavrukhin, I., Lawrence, D., Lee, J.H., Lee, K., Lee, S., Lee, Y.-J., Li, S., Li, W., Li, Xiaqing, Li, Xuan, Liao, J., Lin, H.-W., Lisa, M.A., Liu, K.-F., Liu, M.X., Liu, T., Liuti, S., Liyanage, N., Llope, W.J., Loizides, C., Longo, R., Lorenzon, W., Lunkenheimer, S., Luo, X., Ma, R., McKinnon, B., Meekins, D.G., Mehtar-Tani, Y., Melnitchouk, W., Metz, A., Meyer, C.A., Meziani, Z.-E., Michaels, R., Michel, J.K.L., Milner, R.G., Mkrtchyan, H., Mohanmurthy, P., Mohanty, B., Mokeev, V.I., Moon, D.H., Mooney, I.A., Morningstar, C., Morrison, D.P., Müller, B., Mukherjee, S., Mulligan, J., Munoz Camacho, C., Murillo Quijada, J.A., Murray, M.J., Nadeeshani, S.A., Nadel-Turonski, P., Nam, J.D., Nattrass, C.E., Nijs, G., Noronha, J., Noronha-Hostler, J., Novitzky, N., Nycz, M., Olness, F.I., Osborn, J.D., Pak, R., Pandey, B., Paolone, M., Papandreou, Z., Paquet, J.-F., Park, S., Paschke, K.D., Pasquini, B., Pasyuk, E., Patel, T., Patton, A., Paudel, C., Peng, C., Peng, J.C., Pereira Da Costa, H., Perepelitsa, D.V., Peters, M.J., Petreczky, P., Pisarski, R.D., Pitonyak, D., Ploskon, M.A., Posik, M., Poudel, J., Pradhan, R., Prokudin, A., Pruneau, C.A., Puckett, A.J.R., Pujahari, P., Putschke, J., Pybus, J.R., Qiu, J.-W., Rajagopal, K., Ratti, C., Read, K.F., Reed, R., Richards, D.G., Riedl, C., Ringer, F., Rinn, T., Rittenhouse West, J., Roche, J., Rodas, A., Roland, G., Romero-López, F., Rossi, P., Rostomyan, T., Ruan, L., Ruimi, O.M., Saha, N.R., Sahoo, N.R., Sakaguchi, T., Salazar, F., Salgado, C.W., Salmè, G., Salur, S., Santiesteban, S.N., Sargsian, M.M., Sarsour, M., Sato, N., Satogata, T., Sawada, S., Schäfer, T., Scheihing-Hitschfeld, B., Schenke, B., Schindler, S.T., Schmidt, A., Seidl, R., Shabestari, M.H., Shanahan, P.E., Shen, C., Sheng, T.-A., Shepherd, M.R., Sickles, A.M., Sievert, M.D., Smith, K.L., Song, Y., Sorensen, A., Souder, P.A., Sparveris, N., Srednyak, S., Stahl Leiton, A.G., Stasto, A.M., Steinberg, P., Stepanyan, S., Stephanov, M., Stevens, J.R., Stewart, D.J., Stewart, I.W., Stojanovic, M., Strakovsky, I., Strauch, S., Strickland, M., Sunar Cerci, D., Suresh, M., Surrow, B., Syritsyn, S., Szczepaniak, A.P., Tadepalli, A.S., Tang, A.H., Tapia Takaki, J.D., Tarnowsky, T.J., Tawfik, A.N., Taylor, M.I., Tennant, C., Thiel, A., Thomas, D., Tian, Y., Timmins, A.R., Tribedy, P., Tu, Z., Tuo, S., Ullrich, T., Umaka, E., Upton, D.W., Vary, J.P., Velkovska, J., Venugopalan, R., Vijayakumar, A., Vitev, I., Vogelsang, W., Vogt, R., Vossen, A., Voutier, E., Vovchenko, V., Walker-Loud, A., Wang, F., Wang, J., Wang, X., Wang, X.-N., Weinstein, L.B., Wenaus, T.J., Weyhmiller, S., Wissink, S.W., Wojtsekhowski, B., Wong, C.P., Wood, M.H., Wunderlich, Y., Wyslouch, B., Xiao, B.W., Xie, W., Xiong, W., Xu, N., Xu, Q.H., Xu, Z., Yaari, D., Yao, X., Ye, Z., Ye, Z.H., Yero, C., Yuan, F., Zajc, W.A., Zhang, C., Zhang, J., Zhao, F., Zhao, Y., Zhao, Z.W., Zheng, X., Zhou, J., and Zurek, M.
Published: 2024
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17. Measurement of the Nucleon F2n/F2p Structure Function Ratio by the Jefferson Lab MARATHON Tritium/Helium-3 Deep Inelastic Scattering Experiment

Author: Abrams, D, Albataineh, H, Aljawrneh, BS, Alsalmi, S, Androic, D, Aniol, K, Armstrong, W, Arrington, J, Atac, H, Averett, T, Gayoso, C Ayerbe, Bai, X, Bane, J, Barcus, S, Beck, A, Bellini, V, Bhatt, H, Bhetuwal, D, Biswas, D, Blyth, D, Boeglin, W, Bulumulla, D, Butler, J, Camsonne, A, Carmignotto, M, Castellanos, J, Chen, J-P, Cohen, EO, Covrig, S, Craycraft, K, Cruz-Torres, R, Dongwi, B, Duran, B, Dutta, D, Fuchey, E, Gal, C, Gautam, TN, Gilad, S, Gnanvo, K, Gogami, T, Gomez, J, Gu, C, Habarakada, A, Hague, T, Hansen, J-O, Hattawy, M, Hauenstein, F, Higinbotham, DW, Holt, RJ, Hughes, EW, Hyde, C, Ibrahim, H, Jian, S, Joosten, S, Karki, A, Karki, B, Katramatou, AT, Keith, C, Keppel, C, Khachatryan, M, Khachatryan, V, Khanal, A, Kievsky, A, King, D, King, PM, Korover, I, Kulagin, SA, Kumar, KS, Kutz, T, Lashley-Colthirst, N, Li, S, Li, W, Liu, H, Liuti, S, Liyanage, N, Markowitz, P, McClellan, RE, Meekins, D, Beck, S Mey-Tal, Meziani, Z-E, Michaels, R, Mihovilovic, M, Nelyubin, V, Nguyen, D, Nuruzzaman, Nycz, M, Obrecht, R, Olson, M, Owen, VF, Pace, E, Pandey, B, Pandey, V, Paolone, M, Papadopoulou, A, Park, S, Paul, S, Petratos, GG, Petti, R, Piasetzky, E, and Pomatsalyuk, R
Subjects: Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Jefferson Lab Hall A Tritium Collaboration, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract: The ratio of the nucleon F_{2} structure functions, F_{2}^{n}/F_{2}^{p}, is determined by the MARATHON experiment from measurements of deep inelastic scattering of electrons from ^{3}H and ^{3}He nuclei. The experiment was performed in the Hall A Facility of Jefferson Lab using two high-resolution spectrometers for electron detection, and a cryogenic target system which included a low-activity tritium cell. The data analysis used a novel technique exploiting the mirror symmetry of the two nuclei, which essentially eliminates many theoretical uncertainties in the extraction of the ratio. The results, which cover the Bjorken scaling variable range 0.19
Published: 2022

18. Measurement of the Nucleon $F^n_2/F^p_2$ Structure Function Ratio by the Jefferson Lab MARATHON Tritium/Helium-3 Deep Inelastic Scattering Experiment

Author: MARATHON Collaboration, Abrams, D., Albataineh, H., Aljawrneh, B. S., Alsalmi, S., Aniol, K., Armstrong, W., Arrington, J., Atac, H., Averett, T., Gayoso, C. Ayerbe, Bai, X., Bane, J., Barcus, S., Beck, A., Bellini, V., Bhatt, H., Bhetuwal, D., Biswas, D., Blyth, D., Boeglin, W., Bulumulla, D., Butler, J., Camsonne, A., Carmignotto, M., Castellanos, J., Chen, J. -P., Cohen, E. O., Covrig, S., Craycraft, K., Cruz-Torres, R., Dongwi, B., Duran, B., Dutta, D., Fuchey, E., Gal, C., Gautam, T. N., Gilad, S., Gnanvo, K., Gogami, T., Gomez, J., Gu, C., Habarakada, A., Hague, T., Hansen, J. -O., Hattawy, M., Hauenstein, F., Higinbotham, D. W., Holt, R. J., Hughes, E. W., Hyde, C., Ibrahim, H., Jian, S., Joosten, S., Karki, A., Karki, B., Katramatou, A. T., Keith, C., Keppel, C., Khachatryan, M., Khachatryan, V., Khanal, A., Kievsky, A., King, D., King, P. M., Korover, I., Kulagin, S. A., Kumar, K. S., Kutz, T., Lashley-Colthirst, N., Li, S., Li, W., Liu, H., Liuti, S., Liyanage, N., Markowitz, P., McClellan, R. E., Meekins, D., Beck, S. Mey-Tal, Meziani, Z. -E., Michaels, R., Mihovilovic, M., Nelyubin, V., Nguyen, D., Nuruzzaman, Nycz, M., Obrecht, R., Olson, M., Owen, V. F., Pace, E., Pandey, B., Pandey, V., Paolone, M., Papadopoulou, A., Park, S., Paul, S., Petratos, G. G., Petti, R., Piasetzky, E., Pomatsalyuk, R., Premathilake, S., Puckett, A. J. R., Punjabi, V., Ransome, R. D., Rashad, M. N. H., Reimer, P. E., Riordan, S., Roche, J., Salme, G., Santiesteban, N., Sawatzky, B., Scopetta, S., Schmidt, A., Schmookler, B., Segal, J., Segarra, E. P., Shahinyan, A., Sirca, S., Sparveris, N., Su, T., Suleiman, R., Szumila-Vance, H., Tadepalli, A. S., Tang, L., Tireman, W., Tortorici, F., Urciuoli, G. M., Wojtsekhowski, B., Wood, S., Ye, Z. H., Ye, Z. Y., and Zhang, J.
Subjects: High Energy Physics - Experiment
Abstract: The ratio of the nucleon $F_2$ structure functions, $F_2^n/F_2^p$, is determined by the MARATHON experiment from measurements of deep inelastic scattering of electrons from $^3$H and $^3$He nuclei. The experiment was performed in the Hall A Facility of Jefferson Lab and used two high resolution spectrometers for electron detection, and a cryogenic target system which included a low-activity tritium cell. The data analysis used a novel technique exploiting the mirror symmetry of the two nuclei, which essentially eliminates many theoretical uncertainties in the extraction of the ratio. The results, which cover the Bjorken scaling variable range $0.19 < x < 0.83$, represent a significant improvement compared to previous SLAC and Jefferson Lab measurements for the ratio. They are compared to recent theoretical calculations and empirical determinations of the $F_2^n/F_2^p$ ratio.
Published: 2021

19. Science Requirements and Detector Concepts for the Electron-Ion Collider: EIC Yellow Report

Author: Khalek, R. Abdul, Accardi, A., Adam, J., Adamiak, D., Akers, W., Albaladejo, M., Al-bataineh, A., Alexeev, M. G., Ameli, F., Antonioli, P., Armesto, N., Armstrong, W. R., Arratia, M., Arrington, J., Asaturyan, A., Asai, M., Aschenauer, E. C., Aune, S., Avagyan, H., Gayoso, C. Ayerbe, Azmoun, B., Bacchetta, A., Baker, M. D., Barbosa, F., Barion, L., Barish, K. N., Barry, P. C., Battaglieri, M., Bazilevsky, A., Behera, N. K., Benmokhtar, F., Berdnikov, V. V., Bernauer, J. C., Bertone, V., Bhattacharya, S., Bissolotti, C., Boer, D., Boglione, M., Bondì, M., Boora, P., Borsa, I., Bossù, F., Bozzi, G., Brandenburg, J. D., Brei, N., Bressan, A., Brooks, W. K., Bufalino, S., Bukhari, M. H. S., Burkert, V., Buttimore, N. H., Camsonne, A., Celentano, A., Celiberto, F. G., Chang, W., Chatterjee, C., Chen, K., Chetry, T., Chiarusi, T., Chien, Y. -T., Chiosso, M., Chu, X., Chudakov, E., Cicala, G., Cisbani, E., Cloet, I. C., Cocuzza, C., Cole, P. L., Colella, D., Collins II, J. L., Constantinou, M., Contalbrigo, M., Contin, G., Corliss, R., Cosyn, W., Courtoy, A., Crafts, J., Cruz-Torres, R., Cuevas, R. C., D'Alesio, U., Torre, S. Dalla, Das, D., Dasgupta, S. S., Da Silva, C., Deconinck, W., Defurne, M., DeGraw, W., Dehmelt, K., Del Dotto, A., Delcarro, F., Deshpande, A., Detmold, W., De Vita, R., Diefenthaler, M., Dilks, C., Dixit, D. U., Dulat, S., Dumitru, A., Dupré, R., Durham, J. M., Echevarria, M. G., Fassi, L. El, Elia, D., Ent, R., Esha, R., Ethier, J. J., Evdokimov, O., Eyser, K. O., Fanelli, C., Fatemi, R., Fazio, S., Fernandez-Ramirez, C., Finger, M., Finger Jr., M., Fitzgerald, D., Flore, C., Frederico, T., Friščić, I., Fucini, S., Furletov, S., Furletova, Y., Gal, C., Gamberg, L., Gao, H., Garg, P., Gaskell, D., Gates, K., Ducati, M. B. Gay, Gericke, M., da Silveira, G. Gil, Girod, F. -X., Glazier, D. I., Gnanvo, K., Goncalves, V. P., Gonella, L., Hernandez, J. O. Gonzalez, Goto, Y., Grancagnolo, F., Greiner, L. C., Guryn, W., Guzey, V., Hatta, Y., Hattawy, M., Hauenstein, F., He, X., Hemmick, T. K., Hen, O., Heyes, G., Higinbotham, D. W., Blin, A. N. Hiller, Hobbs, T. J., Hohlmann, M., Horn, T., Hou, T. -J., Huang, J., Huang, Q., Huber, G. M., Hyde, C. E., Iakovidis, G., Ilieva, Y., Jacak, B. V., Jacobs, P. M., Jadhav, M., Janoska, Z., Jentsch, A., Jezo, T., Jing, X., Jones, P. G., Joo, K., Joosten, S., Kafka, V., Kalantarians, N., Kalicy, G., Kang, D., Kang, Z. B., Kauder, K., Kay, S. J. D., Keppel, C. E., Kim, J., Kiselev, A., Klasen, M., Klein, S., Klest, H. T., Korchak, O., Kostina, A., Kotko, P., Kovchegov, Y. V., Krelina, M., Kuleshov, S., Kumano, S., Kumar, K. S., Kumar, R., Kumar, L., Kumerički, K., Kusina, A., Kutak, K., Lai, Y. S., Lalwani, K., Lappi, T., Lauret, J., Lavinsky, M., Lawrence, D., Lednicky, D., Lee, C., Lee, K., Lee, S. H., Levorato, S., Li, H., Li, S., Li, W., Li, X., Li, W. B., Ligonzo, T., Liu, H., Liu, M. X., Liu, X., Liuti, S., Liyanage, N., Lorcé, C., Lu, Z., Lucero, G., Lukow, N. S., Lunghi, E., Majka, R., Makris, Y., Mandjavidze, I., Mantry, S., Mäntysaari, H., Marhauser, F., Markowitz, P., Marsicano, L., Mastroserio, A., Mathieu, V., Mehtar-Tani, Y., Melnitchouk, W., Mendez, L., Metz, A., Meziani, Z. -E., Mezrag, C., Mihovilovič, M., Milner, R., Mirazita, M., Mkrtchyan, H., Mkrtchyan, A., Mochalov, V., Moiseev, V., Mondal, M. M., Morreale, A., Morrison, D., Motyka, L., Moutarde, H., Camacho, C. Muñoz, Murgia, F., Murray, M. J., Musico, P., Nadel-Turonski, P., Nadolsky, P. M., Nam, J., Newman, P. R., Neyret, D., Nguyen, D., Nocera, E. R., Noferini, F., Noto, F., Nunes, A. S., Okorokov, V. A., Olness, F., Osborn, J. D., Page, B. S., Park, S., Parker, A., Paschke, K., Pasquini, B., Paukkunen, H., Paul, S., Pecar, C., Pegg, I. L., Pellegrino, C., Peng, C., Pentchev, L., Perrino, R., Petriello, F., Petti, R., Pilloni, A., Pinkenburg, C., Pire, B., Pisano, C., Pitonyak, D., Poblaguev, A. A., Polakovic, T., Posik, M., Potekhin, M., Preghenella, R., Preins, S., Prokudin, A., Pujahari, P., Purschke, M. L., Pybus, J. R., Radici, M., Rajput-Ghoshal, R., Reimer, P. E., Rinaldi, M., Ringer, F., Roberts, C. D., Rodini, S., Rojo, J., Romanov, D., Rossi, P., Santopinto, E., Sarsour, M., Sassot, R., Sato, N., Schenke, B., Schmidke, W. B., Schmidt, I., Schmidt, A., Schmookler, B., Schnell, G., Schweitzer, P., Schwiening, J., Scimemi, I., Scopetta, S., Segovia, J., Seidl, R., Sekula, S., Semenov-Tian-Shanskiy, K., Shao, D. Y., Sherrill, N., Sichtermann, E., Siddikov, M., Signori, A., Singh, B. K., Širca, S., Slifer, K., Slominski, W., Sokhan, D., Sondheim, W. E., Song, Y., Soto, O., Spiesberger, H., Stasto, A. M., Stepanov, P., Sterman, G., Stevens, J. R., Stewart, I. W., Strakovsky, I., Strikman, M., Sturm, M., Stutzman, M. L., Sullivan, M., Surrow, B., Svihra, P., Syritsyn, S., Szczepaniak, A., Sznajder, P., Szumila-Vance, H., Szymanowski, L., Tadepalli, A. S., Takaki, J. D. Tapia, Tassielli, G. F., Terry, J., Tessarotto, F., Tezgin, K., Tomasek, L., Acosta, F. Torales, Tribedy, P., Tricoli, A., Triloki, Tripathi, S., Trotta, R. L., Tsai, O. D., Tu, Z., Tuvè, C., Ullrich, T., Ungaro, M., Urciuoli, G. M., Valentini, A., Vancura, P., Vandenbroucke, M., Van Hulse, C., Varner, G., Venugopalan, R., Vitev, I., Vladimirov, A., Volpe, G., Vossen, A., Voutier, E., Wagner, J., Wallon, S., Wang, H., Wang, Q., Wang, X., Wei, S. Y., Weiss, C., Wenaus, T., Wennlöf, H., Wickramaarachchi, N., Wikramanayake, A., Winney, D., Wong, C. P., Woody, C., Xia, L., Xiao, B. W., Xie, J., Xing, H., Xu, Q. H., Zhang, J., Zhang, S., Zhang, Z., Zhao, Z. W., Zhao, Y. X., Zheng, L., Zhou, Y., and Zurita, P.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment, High Energy Physics - Phenomenology, Nuclear Experiment, Nuclear Theory
Abstract: This report describes the physics case, the resulting detector requirements, and the evolving detector concepts for the experimental program at the Electron-Ion Collider (EIC). The EIC will be a powerful new high-luminosity facility in the United States with the capability to collide high-energy electron beams with high-energy proton and ion beams, providing access to those regions in the nucleon and nuclei where their structure is dominated by gluons. Moreover, polarized beams in the EIC will give unprecedented access to the spatial and spin structure of the proton, neutron, and light ions. The studies leading to this document were commissioned and organized by the EIC User Group with the objective of advancing the state and detail of the physics program and developing detector concepts that meet the emerging requirements in preparation for the realization of the EIC. The effort aims to provide the basis for further development of concepts for experimental equipment best suited for the science needs, including the importance of two complementary detectors and interaction regions. This report consists of three volumes. Volume I is an executive summary of our findings and developed concepts. In Volume II we describe studies of a wide range of physics measurements and the emerging requirements on detector acceptance and performance. Volume III discusses general-purpose detector concepts and the underlying technologies to meet the physics requirements. These considerations will form the basis for a world-class experimental program that aims to increase our understanding of the fundamental structure of all visible matter, Comment: 902 pages, 415 authors, 151 institutions
Published: 2021
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20. Measurement of deeply virtual Compton scattering off Helium-4 with CLAS at Jefferson Lab

Author: Dupré, R., Hattawy, M., Baltzell, N. A., Bültmann, S., De Vita, R., Alaoui, A. El, Fassi, L. El, Egiyan, H., Girod, F. X., Guidal, M., Hafidi, K., Jenkins, D., Liuti, S., Perrin, Y., Stepanyan, S., Torayev, B., Voutier, E., Amaryan, M. J., Armstrong, W. R., Atac, H., Gayoso, C. Ayerbe, Barion, L., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bondi, M., Bossù, F., Boiarinov, S., Briscoe, W. J., Bulumulla, D., Burkert, V., Carman, D. S., Carvajal, J. C., Caudron, M., Celentano, A., Chatagnon, P., Chesnokov, V., Chetry, T., Ciullo, G., Clary, B. A., Cole, P. L., Contalbrigo, M., Costantini, G., Crede, V., D'Angelo, A., Dashyan, N., Defurne, M., Deur, A., Diehl, S., Djalali, C., Ehrhart, M., Elouadrhiri, L., Eugenio, P., Fegan, S., Filippi, A., Forest, T. A., Ghandilyan, Y., Gilfoyle, G. P., Gothe, R. W., Griffioen, K. A., Hakobyan, H., Hayward, T. B., Hicks, K., Hobart, A., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jo, H. S., Joo, K., Joosten, S., Keller, D., Khachatryan, G., Khanal, A., Khandaker, M., Kim, A., Kim, W., Kripko, A., Kubarovsky, V., Kuhn, S. E., Lanza, L., Livingston, K., Kabir, M. L., Leali, M., Lenisa, P., MacGregor, I. J. D., Marchand, D., Markov, N., Mascagna, V., Mayer, M., McKinnon, B., Mirazita, M., Mokeev, V. I., Neupane, K., Niccolai, S., O'Connell, T. R., Osipenko, M., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Payette, D., Phelps, W., Pivnyuk, N., Pogorelko, O., Poudel, J., Prok, Y., Ripani, M., Ritman, J., Rizzo, A., Rosner, G., Rossi, P., Rowley, J., Sabatié, F., Salgado, C., Schmidt, A., Schumacher, R., Sergeyeva, V., Sharabian, Y., Shrestha, U., Sokhan, D., Soto, O., Sparveris, N., Strakovsky, I. I., Strauch, S., Tyler, N., Ungaro, M., Venturelli, L., Voskanyan, H., Vossen, A., Watts, D., Wei, K., Wei, X., Weinstein, L. B., Wishart, R., Wood, M. H., Yale, B., Zachariou, N., and Zhang, J.
Subjects: Nuclear Experiment
Abstract: We report on the measurement of the beam spin asymmetry in the deeply virtual Compton scattering off $^4$He using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab using a 6 GeV longitudinally polarized electron beam incident on a pressurized $^4$He gaseous target. We detail the method used to ensure the exclusivity of the measured reactions, in particular the upgrade of CLAS with a radial time projection chamber to detect the low-energy recoiling $^4$He nuclei and an inner calorimeter to extend the photon detection acceptance at forward angles. Our results confirm the theoretically predicted enhancement of the coherent ($e^4$He$~\to~e'$$^4$He$'\gamma'$) beam spin asymmetries compared to those observed on the free proton, while the incoherent ($e^4$He$~\to~e'$p$'\gamma'$X$'$) asymmetries exhibit a 30$\%$ suppression. From the coherent data, we were able to extract, in a model-independent way, the real and imaginary parts of the only $^4$He Compton form factor, $\cal H_A$, leading the way toward 3D imaging of the partonic structure of nuclei.
Published: 2021
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21. Measurement of the proton spin structure at long distances

Author: Zheng, X., Deur, A., Kang, H., Kuhn, S. E., Ripani, M., Zhang, J., Adhikari, K. P., Adhikari, S., Amaryan, M. J., Atac, H., Avakian, H., Barion, L., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Boiarinov, S., Bondi, M., Bossu, F., Bosted, P., Briscoe, W. J., Brock, J., Brooks, W. K., Bulumulla, D., Burkert, V. D., Carlin, C., Carman, D. S., Carvajal, J. C., Celentano, A., Chatagnon, P., Chetry, T., Chen, J. -P., Choi, S., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Diehl, S., Djalali, C., Drozdov, V. A., Dupre, R., Ehrhart, M., Alaoui, A. El, Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Fersch, R., Filippi, A., Forest, T. A., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. -X., Glazier, D. I., Gothe, R. W., Griffioen, K. A., Guidal, M., Guler, N., Guo, L., Hafidi, K., Hakobyan, H., Hattawy, M., Hayward, T. B., Heddle, D., Hicks, K., Hobart, A., Holmstrom, T., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jo, H. S., Joo, K., Joosten, S., Keith, C. D., Keller, D., Khanal, A., Khandaker, M., Kim, C. W., Kim, W., Klein, F. J., Kripko, A., Kubarovsky, V., Lanza, L., Leali, M., Lenisa, P., livingston, K., Long, E., MacGregor, I. J. D., Markov, N., Marsicano, L., Mascagna, V., McKinnon, B., Meekins, D. G., Mineeva, T., Mirazita, M., Mokeev, V., Mullen, C., Nadel-Turonski, P., Neupane, K., Niccolai, S., Osipenko, M., Ostrovidov, A. I., Paolone, M., Pappalardo, L., Park, K., Pasyuk, E., Phelps, W., Phillips, S. K., Pogorelko, O., Poudel, J., Prok, Y., Raue, B. A., Ritman, J., Rizzo, A., Rosner, G., Rossi, P., Rowley, J., Sabatie, F., Salgado, C., Schmidt, A., Schumacher, R. A., Seely, M. L., Sharabian, Y. G., Shrestha, U., Sirca, S., Slifer, K., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Sulkosky, V., Tyler, N., Ungaro, M., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Yale, B., Zachariou, N., and Zhao, Z. W.
Subjects: Nuclear Experiment, High Energy Physics - Experiment
Abstract: Measuring the spin structure of protons and neutrons tests our understanding of how they arise from quarks and gluons, the fundamental building blocks of nuclear matter. At long distances the coupling constant of the strong interaction becomes large, requiring non-perturbative methods to calculate quantum chromodynamics processes, such as lattice gauge theory or effective field theories. Here we report proton spin structure measurements from scattering a polarized electron beam off polarized protons. The spin-dependent cross-sections were measured at large distances, corresponding to the region of low momentum transfer squared between 0.012 and 1.0 GeV$^2$. This kinematic range provides unique tests of chiral effective field theory predictions. Our results show that a complete description of the nucleon spin remains elusive, and call for further theoretical works, e.g. in lattice quantum chromodynamics. Finally, our data extrapolated to the photon point agree with the Gerasimov-Drell-Hearn sum rule, a fundamental prediction of quantum field theory that relates the anomalous magnetic moment of the proton to its integrated spin-dependent cross-sections., Comment: Published version. 10 pages, 5 figures. 20 pages of supplementary material (data tables and a figure)
Published: 2021
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22. Differential cross sections for {\Lambda}(1520) using photoproduction at CLAS

Author: Shrestha, U., Chetry, T., Djalali, C., Hicks, K., Nam, S. i., Adhikari, K. P., Adhikari, S., Amaryan, M. J., Angelini, G., Atac, H., Barion, L., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bondi, M., Bossu, F., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Bulumulla, D., Burkert, V. D., Carman, D. S., Carvajal, J. C., Celentano, A., Chatagnon, P., Ciullo, G., Cole, P. L., Contalbrigo, M., Crede, V., De Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Diehl, S., Dugger, M., Dupre, R., Egiyan, H., Ehrhart, M., Fassi, L. El, Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Glazier, D. I., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hattawy, M., Hayward, T. B., Heddle, D., Holtrop, M., Huang, Q., Ireland, D. G., Isupov, E. L., Jo, H. S., Joo, K., Joosten, S., Keller, D., Khanal, A., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Kripko, A., Kubarovsky, V., Lanza, L., Leali, M., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Marsicano, L., Mascagna, V., McCracken, M. E., McKinnon, B., Mokeev, V., Movsisyan, A., Munevar, E., Camacho, C. Munoz, Turonski, P. Nadel, Neupane, 5 K., Niccolai, S., Niculescu, G., O'Connell, T., Osipenko, M., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pivnyuk, N., Pogorelko, O., Poudel, J., Prok, Y., Ripani, M., Ritman, J., Rizzo, A., Rosner, G., Rowley, J., Sabatie, F., Salgado, C., Schmidt, A., Schumacher, R. A., Sharabian, Y. G., Soto, O., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Tyler, N., Ungaro, M., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D. P., Wei, K., Wei, X., Wood, M. H., Yale, B., Zachariou, N., Zhang, J., and Zhao, Z. W.
Subjects: High Energy Physics - Experiment
Abstract: The reaction $\gamma p \rightarrow K^{+} \Lambda(1520)$ using photoproduction data from the CLAS $g12$ experiment at Jefferson Lab is studied. The decay of $\Lambda(1520)$ into two exclusive channels, $\Sigma^{+}\pi^{-}$ and $\Sigma^{-}\pi^{+}$, is studied from the detected $K^{+}$, $\pi^{+}$, and $\pi^{-}$ particles. A good agreement is established for the $\Lambda(1520)$ differential cross sections with the previous CLAS measurements. The differential cross sections as a function of CM angle are extended to higher photon energies. Newly added are the differential cross sections as a function of invariant 4-momentum transfer $t$, which is the natural variable to use for a theoretical model based on a Regge-exchange reaction mechanism. No new $N^*$ resonances decaying into the $K^+\Lambda(1520)$ final state are found., Comment: 16 pages, 12 figures, 2 tables
Published: 2021
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23. Observation of Beam Spin Asymmetries in the Process $e p \rightarrow e \pi^{+}\pi^{-}X$ with CLAS12

Author: Hayward, T. B., Dilks, C., Vossen, A., Avakian, H., Adhikari, S., Angelini, G., Arratia, M., Atac, H., Gayoso, C. Ayerbe, Baltzell, N. A., Barion, L., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bondì, M., Bossù, F., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Bulumulla, D., Burkert, V. D., Carman, D. S., Carvajal, J. C., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clary, B. A., Cole, P. L., Contalbrigo, M., Costantini, G., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dupre, R., Dugger, M., Egiyan, H., Ehrhart, M., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Fegan, S., Filippi, A., Forest, T. A., Gavalian, G., Gilfoyle, G. P., Girod, F. X., Glazier, D. I., Golubenko, A. A., Gothe, R. W., Gotra, Y., Griffioen, K. A., Guidal, M., Hafidi, K., Hakobyan, H., Hattawy, M., Hauenstein, F., Hicks, K., Hobart, A., Holtrop, M., Ireland, D. G., Isupov, E. L., Jo, H. S., Joo, K., Joosten, S., Keller, D., Khachatryan, M., Khanal, A., Kim, A., Kim, W., Kripko, A., Kubarovsky, V., Kuhn, S. E., Lanza, L., Leali, M., Lee, S., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Markov, N., Marsicano, L., Mascagna, V., McKinnon, B., Meziani, Z. E., Mirazita, M., Mokeev, V., Movsisyan, A, Camacho, C. Munoz, Nadel-Turonski, P., Naidoo, P., Nanda, S., Neupane, K., Niccolai, S., Niculescu, G., O'Connell, T. R., Osipenko, M., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Phelps, W., Pogorelko, O., Prok, Y., Raue, B. A., Ripani, M., Ritman, J., Rizzo, A., Rossi, P., Rowley, J., Sabatié, F., Salgado, C., Schmidt, A., Segarra, E. P., Sharabian, Y. G., Shrestha, U., Sokhan, D., Soto, O., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Thornton, A., Tyler, N., Tyson, R., Ungaro, M., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D. P., Wei, K., Wei, X., Wood, M. H., Yale, B., Zachariou, N., and Zhang, J.
Subjects: High Energy Physics - Experiment
Abstract: The observation of beam spin asymmetries in two-pion production in semi-inclusive deep inelastic scattering off an unpolarized proton target is reported. The data presented here were taken in the fall of 2018 with the CLAS12 spectrometer using a 10.6 GeV longitudinally spin-polarized electron beam delivered by CEBAF at JLab. The measured asymmetries provide the first opportunity to extract the parton distribution function $e(x)$, which provides information about the interaction between gluons and quarks, in a collinear framework that offers cleaner access than previous measurements. The asymmetries also constitute the first ever signal sensitive to the helicity-dependent two-pion fragmentation function $G_1^\perp$. A clear sign change is observed around the $\rho$ mass that appears in model calculations and is indicative of the dependence of the produced pions on the helicity of the fragmenting quark., Comment: 6 pages, 5 figures
Published: 2021
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24. Multidimensional, high precision measurements of beam single spin asymmetries in semi-inclusive $\pi^{+}$ electroproduction off protons in the valence region

Author: Diehl, S., Kim, A., Angelini, G., Joo, K., Adhikari, S., Amaryan, M., Arratia, M., Atac, H., Avakian, H., Gayoso, C. Ayerbe, Baltzell, N. A., Barion, L., Bastami, S., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bondi, M., Bossu, F., Boiarinov, S., Brinkmann, K. -T., Briscoe, W. J., Brooks, W., Bulumulla, D., Burkert, V. D., Carman, D. S., Carvajal, J. C., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Clary, B. A., Cole, P. L., Contalbrigo, M., Costantini, G., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Dilks, C., Djalali, C., Dugger, M., Dupre, R., Ehrhart, M., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Fegan, S., Filippi, A., Forest, T., Gavalian, G., Gilfoyle, G. P., Girod, F. X., Glazier, D. I., Golubenko, A. A., Gothe, R. W., Gotra, Y., Griffioen, K. A., Guidal, M., Hafidi, K., Hakobyan, H., Hattawy, M., Hayward, T. B., Heddle, D., Hicks, K., Hobart, A., Holtrop, M., Hyde, C. E., Ireland, D. G., Isupov, E. L., Jo, H. S., Johnston, R., Joosten, S., Keller, D., Khachatryan, M., Khanal, A., Kim, W., Kripko, A., Kubarovsky, V., Kuhn, S. E., Lanza, L., Leali, M., Lee, S., Lenisa, P., Livingston, K., Lu, Z., MacGregor, I. J. D., Marchand, D., Markov, N., Marsicano, L., Mascagna, V., McKinnon, B., Meziani, Z. E., Milner, R. G., Mineeva, T., Mirazita, M., Mokeev, V., Moran, P., Movsisyan, A., Camacho, C. Munoz, Nadel-Turonski, P., Naidoo, P., Neupane, K., Niccolai, S., Niculescu, G., O'Connell, T. R., Osipenko, M., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Phelps, W., Pogorelko, O., Prok, Y., Prokudin, A., Raue, B. A., Ripani, M., Ritman, J., Rizzo, A., Roberts, C. D., Rossi, P., Rowley, J., Sabatie, F., Salgado, C., Schmidt, A., Segarra, E. P., Sharabian, Y. G., Shrestha, U., Simmerling, P., Sokhan, D., Soto, O., Sparveris, N., Stepanyan, S., Stoler, P., Strakovsky, I. I., Strauch, S., Tezgin, K., Thornton, A., Tyler, N., Tyson, R., Ungaro, M., Venturelli, L., Voskanyan, H., Vossen, A., Voutier, E., Watts, D. P., Wei, K., Wei, X., Xu, S. -S., Yale, B., Zachariou, N., and Zhang, J.
Subjects: High Energy Physics - Experiment
Abstract: High precision measurements of the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering (SIDIS) from the proton have been performed using a 10.6~GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. We report here a high precision multidimensional study of single $\pi^{+}$ SIDIS data over a large kinematic range in Bjorken x, fractional energy and transverse momentum of the hadron as well as photon virtualities $Q^{2}$ ranging from $1-7\,$GeV$^{2}$. In particular, the structure function ratio $F^{\sin\phi}_{LU}/F_{UU}$ has been determined, where $F^{\sin\phi}_{LU}$ is a twist-3 quantity that can reveal novel aspects of emergent hadron mass and quark-gluon correlations within the nucleon. The data's impact on the evolving understanding of the underlying reaction mechanisms and their kinematic variation is explored using theoretical models for the different contributing transverse momentum dependent parton distribution functions.
Published: 2021
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25. Ruling out color transparency in quasi-elastic $^{12}$C(e,e'p) up to $Q^2$ of 14.2 (GeV/c)$^2$

Author: Bhetuwal, D., Matter, J., Szumila-Vance, H., Kabir, M. L., Dutta, D., Ent, R., Abrams, D., Ahmed, Z., Aljawrneh, B., Alsalmi, S., Ambrose, R., Androic, D., Armstrong, W., Asaturyan, A., Assumin-Gyimah, K., Gayoso, C. Ayerbe, Bandari, A., Basnet, S., Berdnikov, V., Bhatt, H., Biswas, D., Boeglin, W. U., Bosted, P., Brash, E., Bukhari, M. H. S., Chen, H., Chen, J. P., Chen, M., Christy, E. M., Covrig, S., Craycraft, K., Danagoulian, S., Day, D., Diefenthaler, M., Dlamini, M., Dunne, J., Duran, B., Evans, R., Fenker, H., Fomin, N., Fuchey, E., Gaskell, D., Gautam, T. N., Gonzalez, F. A., Hansen, J. O., Hauenstein, F., Hernandez, A. V., Horn, T., Huber, G. M., Jones, M. K., Joosten, S., Karki, A., Keppel, C., Khanal, A., King, P. M., Kinney, E., Ko, H. S., Kohl, M., Lashley-Colthirst, N., Li, S., Li, W. B., Liyanage, A. H., Mack, D., Malace, S., Markowitz, P., Meekins, D., Michaels, R., Mkrtchyan, A., Mkrtchyan, H., Nazeer, S. J., Nanda, S., Niculescu, G., Niculescu, I., Nguyen, D., Nuruzzaman, Pandey, B., Park, S., Pooser, E., Puckett, A., Rehfuss, M., Reinhold, J., Santiesteban, N., Sawatzky, B., Smith, G. R., Sun, A., Tadevosyan, V., Trotta, R., Wood, S. A., Yero, C., and Zhang, J.
Subjects: Nuclear Experiment, High Energy Physics - Experiment, Nuclear Theory
Abstract: Quasielastic $^{12}$C$(e,e'p)$ scattering was measured at space-like 4-momentum transfer squared $Q^2$~=~8, 9.4, 11.4, and 14.2 (GeV/c)$^2$, the highest ever achieved to date. Nuclear transparency for this reaction was extracted by comparing the measured yield to that expected from a plane-wave impulse approximation calculation without any final state interactions. The measured transparency was consistent with no $Q^2$ dependence, up to proton momenta of 8.5~GeV/c, ruling out the quantum chromodynamics effect of color transparency at the measured $Q^2$ scales in exclusive $(e,e'p)$ reactions. These results impose strict constraints on models of color transparency for protons., Comment: 5 pages, 2 figures
Published: 2020
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26. Photoproduction of the $f_2(1270)$ meson using the CLAS detector

Author: Carver, M., Celentano, A., Hicks, K., Marsicano, L., Mathieu, V., Pilloni, A., Adhikari, K. P., Adhikari, S., Amaryan, M. J., Angelini, Giovanni, Atac, H., Baltzell, N. A., Barion, L., Battaglieri, M., Bedlinskiy, I., Benmokhtar, Fatiha, Bianconi, A., Biselli, A. S., Bondi, M., Bossù, F., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Bulumulla, D., Burkert, V. D., Carman, D. S., Carvajal, J. C., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Clary, B. A., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De~Vita, R., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., Ehrhart, M., El~Alaoui, A., El~Fassi, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Gavalian, G., Gevorgyan, N., Gilfoyle, G. P., Girod, F. X., Gothe, R. W., Griffioen, K. A., Hafidi, K., Hakobyan, H., Hattawy, M., Hayward, T. B., Heddle, D., Holtrop, M., Huang, Q., Hyde, C. E., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jenkins, D., Jo, H. S., Joo, K., Joosten, S. ~, Keller, D., Khanal, A., Khandaker, M., Kim, A., Kim, C. W., Klein, F. J., Kripko, A., Kubarovsky, V., Lanza, L., Leali, M., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Mascagna, V., McCracken, M. E., McKinnon, B., Meziani, Z. E., Mokeev, V., A~Movsisyan, Munevar, E., Munoz~Camacho, C., Nadel-Turonski, P., Neupane, K., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Phelps, W., Pogorelko, O., Prok, Y., Protopopescu, D., Ripani, M., Ritchie, B. G., Ritman, J., Rizzo, A., Rosner, G., Rowley, J., Sabatié, F., Salgado, C., Schmidt, A., Schumacher, R. A., Sharabian, Y. G., Shrestha, U., Sokhan, D., Soto, O., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Tyler, N., Tyson, R., Ungaro, M., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D. P., Wei, K., Wei, X., Yale, B., Zachariou, N., Zhang, J., and Zhao, Z. W.
Subjects: Nuclear Experiment, High Energy Physics - Experiment
Abstract: The quark structure of the $f_2(1270)$ meson has, for many years, been assumed to be a pure quark-antiquark ($q\bar{q}$) resonance with quantum numbers $J^{PC} = 2^{++}$. Recently, it was proposed that the $f_2(1270)$ is a molecular state made from the attractive interaction of two $\rho$-mesons. Such a state would be expected to decay strongly to final states with charged pions, due to the dominant decay $\rho \to \pi^+ \pi^-$, whereas decay to two neutral pions would likely be suppressed. Here, we measure for the first time the reaction $\gamma p \to \pi^0 \pi^0 p$, using the CLAS detector at Jefferson Lab for incident beam energies between 3.6-5.4~GeV. Differential cross sections, $d\sigma / dt$, for $f_2(1270)$ photoproduction are extracted with good precision, due to low backgrounds, and are compared with theoretical calculations., Comment: 5 pages, 4 figures
Published: 2020
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27. Picosecond Timing Resolution Measurements of Low Gain Avalanche Detectors with a 120 GeV Proton Beam for the TOPSiDE Detector Concept

Author: Jadhav, M., Armstrong, W., Cloet, I., Joosten, S., Mazza, S. M., Metcalfe, J., Meziani, Z. -E., Sadrozinski, H. F. -W., Schumm, B., and Seiden, A.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract: This paper presents results that take a critical step toward proving 10 ps timing resolution's feasibility for particle identification in the TOPSiDE detector concept for the Electron-Ion Collider. Measurements of LGADs with a thickness of 35 micro-m and 50 micro-m are evaluated with a 120 GeV proton beam. The performance of the gain and timing response is assessed, including the dependence on the reverse bias voltage and operating temperature. The best timing resolution of UFSDs in a test beam to date is achieved using three combined planes of 35 micro-m thick LGADs at -30 degree celsius with a precision of 14.3 ps (uncertainty 1.5 ps)., Comment: 18 pages, 16 figures, 3 tables
Published: 2020
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28. Determining the gluonic gravitational form factors of the proton

Author: Duran, B., Meziani, Z.-E., Joosten, S., Jones, M. K., Prasad, S., Peng, C., Armstrong, W., Atac, H., Chudakov, E., Bhatt, H., Bhetuwal, D., Boer, M., Camsonne, A., Chen, J.-P., Dalton, M. M., Deokar, N., Diefenthaler, M., Dunne, J., El Fassi, L., Fuchey, E., Gao, H., Gaskell, D., Hansen, O., Hauenstein, F., Higinbotham, D., Jia, S., Karki, A., Keppel, C., King, P., Ko, H. S., Li, X., Li, R., Mack, D., Malace, S., McCaughan, M., McClellan, R. E., Michaels, R., Meekins, D., Paolone, Michael, Pentchev, L., Pooser, E., Puckett, A., Radloff, R., Rehfuss, M., Reimer, P. E., Riordan, S., Sawatzky, B., Smith, A., Sparveris, N., Szumila-Vance, H., Wood, S., Xie, J., Ye, Z., Yero, C., and Zhao, Z.
Published: 2023
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29. Extraction of beam-spin asymmetries from the hard exclusive $\pi^{+}$ channel off protons in a wide range of kinematics

Author: Diehl, S., Joo, K., Kim, A., Avakian, H., Kroll, P., Park, K., Riser, D., Semenov-Tian-Shansky, K., Tezgin, K., Adhikari, K. P., Adhikari, S., Amaryan, M. J., Angelini, G., Asryan, G., Atac, H., Barion, L., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Boss`u, F., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Bulumulla, D., Burkert, V. D., Carman, D. S., Carvajal, J. C., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Dilks, C., Djalali, C., Dupre, R., Egiyan, H., Ehrhart, M., Alaoui, A. El, Fassi, L. El, Eugenio, P., Filippi, A., Forest, T. A., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Glazier, D. I., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hakobyan, H., Harrison, N., Hattawy, M., Hayward, T. B., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jo, H. S., Joosten, S., Keller, D., Khachatryan, M., Khanal, A., Khandaker, M., Kim, C. W., Kim, W., Kubarovsky, V., Kuhn, S. E., Lanza, L., Leali, M., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Markov, N., Marsicano, L., Mascagna, V., McKinnon, B., Meziani, Z. E., Mineeva, T., Mirazita, M., Mokeev, V., Camacho, C. Munoz, Nadel-Turonski, P., Niculescu, G., Osipenko, M., Paolone, M., Pappalardo, L. L., Pasyuk, E., Phelps, W., Pogorelko, O., Price, J. W., Prok, Y., Raue, B. A., Ripani, M., Rizzo, A., Rossi, P., Rowley, J., Sabatie, F., Salgado, C., Schmidt, A., Schumacher, R. A., Sharabian, Y. G., Shrestha, U., Soto, O., Sparveris, N., Stepanyan, S., Stoler, P., Strakovsky, I. I., Strauch, S., Tan, J. A., Tyler, N., Ungaro, M., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D. P., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., and Zhao, Z. W.
Subjects: Nuclear Experiment, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract: We have measured beam-spin asymmetries to extract the $\sin\phi$ moment $A_{LU}^{\sin\phi}$ from the hard exclusive $\vec{e} p \to e^\prime n \pi^+$ reaction above the resonance region, for the first time with nearly full coverage from forward to backward angles in the center-of-mass. The $A_{LU}^{\sin\phi}$ moment has been measured up to 6.6 GeV$^{2}$ in $-t$, covering the kinematic regimes of Generalized Parton Distributions (GPD) and baryon-to-meson Transition Distribution Amplitudes (TDA) at the same time. The experimental results in very forward kinematics demonstrate the sensitivity to chiral-odd and chiral-even GPDs. In very backward kinematics where the TDA framework is applicable, we found $A_{LU}^{\sin\phi}$ to be negative, while a sign change was observed near 90$^\circ$ in the center-of-mass. The unique results presented in this paper will provide critical constraints to establish reaction mechanisms that can help to further develop the GPD and TDA frameworks.
Published: 2020
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30. An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab

Author: Accardi, A., Afanasev, A., Albayrak, I., Ali, S. F., Amaryan, M., Annand, J. R. M., Arrington, J., Asaturyan, A., Atac, H., Avakian, H., Averett, T., Gayoso, C. Ayerbe, Bai, X., Barion, L., Battaglieri, M., Bellini, V., Beminiwattha, R., Benmokhtar, F., Berdnikov, V. V., Bernauer, J. C., Bertone, V., Bianconi, A., Biselli, A., Bisio, P., Blunden, P., Boer, M., Bondì, M., Brinkmann, K. -T., Briscoe, W. J., Burkert, V., Cao, T., Camsonne, A., Capobianco, R., Cardman, L., Carmignotto, M., Caudron, M., Causse, L., Celentano, A., Chatagnon, P., Chen, J. -P., Chetry, T., Ciullo, G., Cline, E., Cole, P. L., Contalbrigo, M., Costantini, G., D'Angelo, A., Darmé, L., Day, D., Defurne, M., De Napoli, M., Deur, A., De Vita, R., D'Hose, N., Diehl, S., Diefenthaler, M., Dongwi, B., Dupré, R., Dutrieux, H., Dutta, D., Ehrhart, M., Fassi, L. El, Elouadrhiri, L., Ent, R., Erler, J., Fernando, I. P., Filippi, A., Flay, D., Forest, T., Fuchey, E., Fucini, S., Furletova, Y., Gao, H., Gaskell, D., Gasparian, A., Gautam, T., Girod, F. -X., Gnanvo, K., Grames, J., Grauvoge, G. N., Gueye, P., Guidal, M., Habet, S., Hague, T. J., Hamilton, D. J., Hansen, O., Hasell, D., Hattawy, M., Higinbotham, D. W., Hobart, A., Horn, T., Hyde, C. E., Ibrahim, H., Ilyichev, A., Italiano, A., Joo, K., Joosten, S. J., Khachatryan, V., Kalantarians, N., Kalicy, G., Karky, B., Keller, D., Keppel, C., Kerver, M., Khandaker, M., Kim, A., Kim, J., King, P. M., Kinney, E., Klimenko, V., Ko, H. -S., Kohl, M., Kozhuharov, V., Kriesten, B. T., Krnjaic, G., Kubarovsky, V., Kutz, T., Lanza, L., Leali, M., Lenisa, P., Liyanage, N., Liu, Q., Liuti, S., Mammei, J., Mantry, S., Marchand, D., Markowitz, P., Marsicano, L., Mascagna, V., Mazouz, M., McCaughan, M., McKinnon, B., McNulty, D., Melnitchouk, W., Metz, A., Meziani, Z. -E., Migliorati, S., Mihovilovic, M., Milner, R., Mkrtchyan, A., Mkrtchyan, H., Movsisyan, A., Moutarde, H., Muhoza, M., Camacho, C. Muñoz, Murphy, J., Nadel-Turonski, P., Nardi, E., Nazeer, J., Niccolai, S., Niculescu, G., Novotny, R., Owens, J. F., Paolone, M., Pappalardo, L., Paremuzyan, R., Pasquini, B., Pasyuk, E., Patel, T., Pegg, I., Peng, C., Perera, D., Poelker, M., Price, K., Puckett, A. J. R., Raggi, M., Randazzo, N., Rashad, M. N. H., Rathnayake, M., Raue, B., Reimer, P. E., Rinaldi, M., Rizzo, A., Roblin, Y., Roche, J., Rondon-Aramayo, O., Sabatié, F., Salmè, G., Santopinto, E., Estrada, R. Santos, Sawatzky, B., Schmidt, A., Schweitzer, P., Scopetta, S., Sergeyeva, V., Shabestari, M., Shahinyan, A., Sharabian, Y., Širca, S., Smith, E. S., Sokhan, D., Somov, A., Sparveris, N., Spata, M., Spiesberger, H., Spreafico, M., Stepanyan, S., Stoler, P., Strakovsky, I., Suleiman, R., Suresh, M., Sznajder, P., Szumila-Vance, H., Tadevosyan, V., Tadepalli, A. S., Thomas, A. W., Tiefenback, M., Trotta, R., Ungaro, M., Valente, P., Vanderhaeghen, M., Venturelli, L., Voskanyan, H., Voutier, E., Wojtsekhowski, B., Wood, M. H., Wood, S., Xie, J., Xiong, W., Ye, Z., Yurov, M., Zaunick, H. -G., Zhamkochyan, S., Zhang, J., Zhang, S., Zhao, S., Zhao, Z. W., Zheng, X., Zhou, J., and Zorn, C.
Subjects: Nuclear Experiment, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract: 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 of the hadronic physics program at Jefferson Lab (JLab), positron beams are complementary, even essential, tools for a precise understanding of the electromagnetic structure of nucleons and nuclei, in both the elastic and deep-inelastic regimes. For instance, elastic scattering of polarized and unpolarized electrons and positrons from the nucleon enables a model independent determination of its electromagnetic form factors. Also, the deeply-virtual scattering of polarized and unpolarized electrons and positrons allows unambiguous separation of the different contributions to the cross section of the lepto-production of photons and of lepton-pairs, enabling an accurate determination of the nucleons and nuclei generalized parton distributions, and providing an access to the gravitational form factors. Furthermore, positron beams offer the possibility of alternative tests of the Standard Model of particle physics through the search of a dark photon, the precise measurement of electroweak couplings, and the investigation of charged lepton flavor violation. This document discusses the perspectives of an experimental program with high duty-cycle positron beams at JLab., Comment: 18 pages, 7 figures This version superseeds the previous version which scientific content was decomposed into several more elaborated articles. All of these articles will be collected in the EPJ A Topical Issue about "Positron beam and physics at Jefferson Lab (e+@Jlab)"
Published: 2020
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31. Azimuthal single- and double-spin asymmetries in semi-inclusive deep-inelastic lepton scattering by transversely polarized protons

Author: HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Bacchetta, A., Belostotski, S., Bryzgalov, V., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Deconinck, W., De Leo, R., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Elbakian, G., Ellinghaus, F., Fantoni, A., Felawka, L., Gavrilov, G., Gharibyan, V., Holler, Y., Ivanilov, A., Jackson, H. E., Joosten, S., Kaiser, R., Karyan, G., Kinney, E., Kisselev, A., Kozlov, V., Kravchenko, P., Lagamba, L., Lapikás, L., Lenisa, P., Lorenzon, W., Manaenkov, S. I., Marianski, B., Marukyan, H., Miyachi, Y., Movsisyan, A., Muccifora, V., Naryshkin, Y., Nass, A., Nazaryan, G., Nowak, W. -D., Pappalardo, L. L., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Schäfer, A., Schnell, G., Seitz, B., Shibata, T. -A., Shutov, V., Statera, M., Terkulov, A., Tytgat, M., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vilardi, I., Yaschenko, S., Zeiler, D., Zihlmann, B., and Zupranski, P.
Subjects: High Energy Physics - Experiment, High Energy Physics - Phenomenology, Nuclear Experiment
Abstract: A comprehensive set of azimuthal single-spin and double-spin asymmetries in semi-inclusive leptoproduction of pions, charged kaons, protons, and antiprotons from transversely polarized protons is presented. These asymmetries include the previously published HERMES results on Collins and Sivers asymmetries, the analysis of which has been extended to include protons and antiprotons and also to an extraction in a three-dimensional kinematic binning and enlarged phase space. They are complemented by corresponding results for the remaining four single-spin and four double-spin asymmetries allowed in the one-photon-exchange approximation of the semi-inclusive deep-inelastic scattering process for target-polarization orientation perpendicular to the direction of the incoming lepton beam. Among those results, significant non-vanishing $\cos{\phi-\phi_S}$ modulations provide evidence for a sizable worm-gear (II) distribution, $g_{1T}$. Most of the other modulations are found to be consistent with zero with the notable exception of large $\sin{\phi_S}$ modulations for charged pions and positive kaons.
Published: 2020

32. Photoproduction of $\eta$ mesons off the proton for $1.2 < E_\gamma < 4.7$ GeV using CLAS at Jefferson Laboratory

Author: Hu, T., Akbar, Z., Crede, V., Adhikari, K. P., Adhikari, S., Amaryan, M. J., Angelini, G., Asryan, G., Atac, H., Gayoso, C. Ayerbe, Barion, L., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bossu, F., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Carman, D. S., Carvajal, J., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Clary, B. A., Cole, P. L., Contalbrigo, M., Cruz-Torres, R., D'Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., Ehrhart, M., Alaoui, A. El, Fassi, L. El, Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Gavalian, G., Gilfoyle, G. P., Girod, F. X., Glazier, D. I., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Hayward, T. B., Heddle, D., Hicks, K., Hobart, A., Holtrop, M., Ilieva, Y., Illari, I., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jo, H. S., Joo, K., Joosten, S., Keller, D., Khachatryan, M., Khanal, A., Khandaker, M., Kim, A., Kim, C. W., Kim, W., Klein, F. J., Kubarovsky, V., Lanza, L., Leali, M., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Markov, N., Mascagna, V., McCracken, M. E., McKinnon, B., Meyer, C. A., Meziani, Z. E., Mineeva, T., Mokeev, V., Movsisyan, A., Munevar, E., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., O'Connell, T., Osipenko, M., Ostrovidov, A. I., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Phelps, W., Pogorelko, O., Poudel, J., Price, J. W., Prok, Y., Protopopescu, D., Raue, B. A., Ripani, M., Ritman, J., Rizzo, A., Rosner, G., Rowley, J., Sabatie, F., Salgado, C., Schmidt, A., Schumacher, R. A., Sharabian, Y. G., Shrestha, U., Skorodumina, Iu., Sokhan, D., Soto, O., Sparveris, N., Stepanyan, S., Stoler, P., Strakovsky, I. I., Strauch, S., Tan, J. A., Tyler, N., Ungaro, M., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D. P., Wei, K., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., and Zhao, Z. W.
Subjects: Nuclear Experiment, High Energy Physics - Experiment
Abstract: Photoproduction cross sections are reported for the reaction $\gamma p\to p\eta$ using energy-tagged photons and the CLAS spectrometer at Jefferson Laboratory. The $\eta$ mesons are detected in their dominant charged decay mode, $\eta\to \pi^+\pi^-\pi^0$, and results on differential cross sections are presented for incident photon energies between 1.2 and 4.7 GeV. These new $\eta$ photoproduction data are consistent with earlier CLAS results but extend the energy range beyond the nucleon resonance region into the Regge regime. The normalized angular distributions are also compared with the experimental results from several other experiments, and with predictions of $\eta$ MAID\,2018 and the latest solution of the Bonn-Gatchina coupled-channel analysis. Differential cross sections $d\sigma/dt$ are presented for incident photon energies $E_\gamma > 2.9$ GeV ($W > 2.5$ GeV), and compared with predictions which are based on Regge trajectories exchange in the $t$-channel (Regge models). The data confirm the expected dominance of $\rho$, $\omega$ vector-meson exchange in an analysis by the Joint Physics Analysis Center., Comment: 24 pages, 22 figures
Published: 2020
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33. Probing few-body nuclear dynamics via 3H and 3He (e,e'p)pn cross-section measurements

Author: Cruz-Torres, R., Nguyen, D., Hauenstein, F., Schmidt, A., Li, S., Abrams, D., Albataineh, H., Alsalmi, S., Androic, D., Aniol, K., Armstrong, W., Arrington, J., Atac, H., Averett, T., Gayoso, C. Ayerbe, Bai, X., Bane, J., Barcus, S., Beck, A., Bellini, V., Benmokhtar, F., Bhatt, H., Bhetuwal, D., Biswas, D., Blyth, D., Boeglin, W., Bulumulla, D., Camsonne, A., Castellanos, J., Chen, J-P., Cohen, E. O., Covrig, S., Craycraft, K., Dongwi, B., Duer, M., Duran, B., Dutta, D., Fuchey, E., Gal, C., Gautam, T. N., Gilad, S., Gnanvo, K., Gogami, T., Golak, J., Gomez, J., Gu, C., Hague, A. Habarakada T., Hansen, O., Hattawy, M., Hen, O., Higinbotham, D. W., Hughes, E., Hyde, C., Ibrahim, H., Jian, S., Joosten, S., Kamada, H., Karki, A., Karki, B., Katramatou, A. T., Keppel, C., Khachatryan, M., Khachatryan, V., Khanal, A., King, D., King, P., Korover, I., Kutz, T., Lashley-Colthirst, N., Laskaris, G., Li, W., Liu, H., Liyanage, N., Markowitz, P., McClellan, R. E., Meekins, D., Meziani, S. Mey-Tal Beck Z-E., Michaels, R., Mihovilovic, M., Nelyubin, V., Nuruzzaman, N., Nycz, M., Obrecht, R., Olson, M., Ou, L., Owen, V., Pandey, B., Pandey, V., Papadopoulou, A., Park, S., Patsyuk, M., Paul, S., Petratos, G. G., Piasetzky, E., Pomatsalyuk, R., Premathilake, S., Puckett, A. J. R., Punjabi, V., Ransome, R., Rashad, M. N. H., Reimer, P. E., Riordan, S., Roche, J., Sargsian, M., Santiesteban, N., Sawatzky, B., Segarra, E. P., Schmookler, B., Shahinyan, A., Sirca, S., Skibinski, R., Sparveris, N., Su, T., Suleiman, R., Szumila-Vance, H., Tadepalli, A. S., Tang, L., Tireman, W., Topolnicki, K., Tortorici, F., Urciuoli, G., Weinstein, L. B., Witala, H., Wojtsekhowski, B., Wood, S., Ye, Z. H., Ye, Z. Y., and Zhang, J.
Subjects: Nuclear Experiment, Nuclear Theory
Abstract: We report the first measurement of the \eep three-body breakup reaction cross sections in helium-3 ($^3$He) and tritium ($^3$H) at large momentum transfer ($\langle Q^2 \rangle \approx 1.9$ (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 $40 \le p_{miss} \le 500$ 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 state-of-the-art ab-initio calculations. Overall good agreement, within $\pm20\%$, is observed between data and calculations for the full $p_{miss}$ range for $^3$H and for $100 \le p_{miss} \le 350$ MeV/c for $^3$He. Including the effects of rescattering of the outgoing nucleon improves agreement with the data at $p_{miss} > 250$ MeV/c and suggests contributions from charge-exchange (SCX) rescattering. The isoscalar sum of $^3$He plus $^3$H, which is largely insensitive to SCX, is described by calculations to within the accuracy of the data over the entire $p_{miss}$ range. This validates current models of the ground state of the three-nucleon system up to very high initial nucleon momenta of $500$ MeV/c., Comment: Accepted for publication in PRL. 8 pages, 3 figures, and online supplementary materials
Published: 2020
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34. Measurement of the helicity asymmetry Eγ→p→→pπ0 for the Eγ→p→→pπ0 reaction in the resonance region: The CLAS Collaboration

Author: Kim, C. W., Zachariou, N., Bashkanov, M., Briscoe, W. J., Fegan, S., Kashevarov, V. L., Nikonov, K., Sarantsev, A., Schmidt, A., Strakovsky, I. I., Watts, D. P., Workman, R. L., Achenbach, P., Akbar, Z., Amaryan, M. J., Angelini, G., Armstrong, W. R., Atac, H., Baashen, L., Baltzell, N. A., Barion, L., Battaglieri, M., Bedlinskiy, I., Benkel, B., Benmokhtar, F., Benmouna, N., Bianconi, A., Biselli, A. S., Booth, W. A., Bossù, F., Boiarinov, S., Brinkmann, K. T., Brock, J., Bulumulla, D., Burkert, V. D., Cao, T., Carlin, C., Carman, D. S., Carvajal, J. C., Chatagnon, P., Chesnokov, V., Chetry, T., Ciullo, G., Clash, G., Cole, P. L., Contalbrigo, M., Becerra, O. Cortes, Costantini, G., Crede, V., D’Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Eugenio, P., Filippi, A., Fogler, C., Gavalian, G., Gilfoyle, G. P., Golubenko, A. A., Gosta, G., Gothe, R. W., Griffioen, K. A., Hafidi, K., Hakobyan, H., Hattawy, M., Hauenstein, F., Hayward, T. B., Heddle, D., Hobart, A., Holtrop, M., Ilieva, Y., Illari, I., Ireland, D. G., Isupov, E. L., Iwamoto, H., Jenkins, D., Jo, H. S., Johnston, R., Joo, K., Joosten, S., Kageya, T., Keith, C. D., Keller, D., Khanal, A., Kim, A., Kim, W., Klein, F. J., Klimenko, V., Kripko, A., Kubarovsky, V., Lanza, L., Leali, M., Lee, S., Li, X., Livingston, K., MacGregor, I. J. D., Marchand, D., Mascagna, V., McKinnon, B., Migliorati, S., Milner, R. G., Mineeva, T., Mokeev, V., Camacho, C. Munoz, Nadel-Turonski, P., Neupane, K., Niccolai, S., Osipenko, M., Ostrovidov, A. I., Pandey, P., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Paul, S. J., Pilleux, N., Pokhrel, M., Poudel, J., Price, J. W., Prok, Y., Radic, A., Ramasubramanian, N., Ratliff, S., Reed, T., Richards, J., Ripani, M., Ritchie, B. G., Ritman, J., Rosner, G., Salgado, C., Schadmand, S., Schott, D., Schumacher, R. A., Scott, M. B. C., Seely, M. L., Seroka, E. M., Shirokov, E. V., Shrestha, U., Sokhan, D., Sparveris, N., Spreafico, M., Strauch, S., Tan, J., Tyson, R., Ungaro, M., Vallarino, S., Venturelli, L., Voskanyan, H., Voutier, E., Wei, X., Williams, R., Wishart, R., Wood, M. H., Yurov, M., Zhang, J., and Zurek, M.
Published: 2023
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35. Measurement of the Nucleon $F^n_2/F^p_2$ Structure Function Ratio by the Jefferson Lab MARATHON Tritium/Helium-3 Deep Inelastic Scattering Experiment

Author: Collaboration, MARATHON, Abrams, D, Albataineh, H, Aljawrneh, BS, Alsalmi, S, Aniol, K, Armstrong, W, Arrington, J, Atac, H, Averett, T, Gayoso, C Ayerbe, Bai, X, Bane, J, Barcus, S, Beck, A, Bellini, V, Bhatt, H, Bhetuwal, D, Biswas, D, Blyth, D, Boeglin, W, Bulumulla, D, Butler, J, Camsonne, A, Carmignotto, M, Castellanos, J, Chen, J-P, Cohen, EO, Covrig, S, Craycraft, K, Cruz-Torres, R, Dongwi, B, Duran, B, Dutta, D, Fuchey, E, Gal, C, Gautam, TN, Gilad, S, Gnanvo, K, Gogami, T, Gomez, J, Gu, C, Habarakada, A, Hague, T, Hansen, J-O, Hattawy, M, Hauenstein, F, Higinbotham, DW, Holt, RJ, Hughes, EW, Hyde, C, Ibrahim, H, Jian, S, Joosten, S, Karki, A, Karki, B, Katramatou, AT, Keith, C, Keppel, C, Khachatryan, M, Khachatryan, V, Khanal, A, Kievsky, A, King, D, King, PM, Korover, I, Kulagin, SA, Kumar, KS, Kutz, T, Lashley-Colthirst, N, Li, S, Li, W, Liu, H, Liuti, S, Liyanage, N, Markowitz, P, McClellan, RE, Meekins, D, Beck, S Mey-Tal, Meziani, Z-E, Michaels, R, Mihovilovic, M, Nelyubin, V, Nguyen, D, Nuruzzaman, Nycz, M, Obrecht, R, Olson, M, Owen, VF, Pace, E, Pandey, B, Pandey, V, Paolone, M, Papadopoulou, A, Park, S, Paul, S, Petratos, GG, Petti, R, Piasetzky, E, and Pomatsalyuk, R
Subjects: hep-ex
Abstract: The ratio of the nucleon $F_2$ structure functions, $F_2^n/F_2^p$, isdetermined by the MARATHON experiment from measurements of deep inelasticscattering of electrons from $^3$H and $^3$He nuclei. The experiment wasperformed in the Hall A Facility of Jefferson Lab and used two high resolutionspectrometers for electron detection, and a cryogenic target system whichincluded a low-activity tritium cell. The data analysis used a novel techniqueexploiting the mirror symmetry of the two nuclei, which essentially eliminatesmany theoretical uncertainties in the extraction of the ratio. The results,which cover the Bjorken scaling variable range $0.19 < x < 0.83$, represent asignificant improvement compared to previous SLAC and Jefferson Labmeasurements for the ratio. They are compared to recent theoreticalcalculations and empirical determinations of the $F_2^n/F_2^p$ ratio.
Published: 2021

36. Precision studies of QCD in the low energy domain of the EIC

Author: Burkert, V.D., Elouadrhiri, L., Afanasev, A., Arrington, J., Contalbrigo, M., Cosyn, W., Deshpande, A., Glazier, D.I., Ji, X., Liuti, S., Oh, Y., Richards, D., Satogata, T., Vossen, A., Abdolmaleki, H., Albataineh, A., Aidala, C.A., Alexandrou, C., Avagyan, H., Bacchetta, A., Baker, M., Benmokhtar, F., Bernauer, J.C., Bissolotti, C., Briscoe, W., Byers, D., Cao, Xu, Carlson, C.E., Cichy, K., Cloet, I.C., Cocuzza, C., Cole, P.L., Constantinou, M., Courtoy, A., Dahiyah, H., Dehmelt, K., Diehl, S., Dilks, C., Djalali, C., Dupré, R., Dusa, S.C., El-Bennich, B., El Fassi, L., Frederico, T., Freese, A., Gamage, B.R., Gamberg, L., Ghoshal, R.R., Girod, F.X., Goncalves, V.P., Gotra, Y., Guo, F.K., Guo, X., Hattawy, M., Hatta, Y., Hayward, T., Hen, O., Huber, G.M., Hyde, C., Isupov, E.L., Jacak, B., Jacobs, W., Jentsch, A., Ji, C.R., Joosten, S., Kalantarians, N., Kang, Z., Kim, A., Klein, S., Kriesten, B., Kumano, S., Kumar, A., Kumericki, K., Kuchera, M., Lai, W.K., Li, Jin, Li, Shujie, Li, W., Li, X., Lin, H.-W., Liu, K.F., Liu, Xiaohui, Markowitz, P., Mathieu, V., McEneaney, M., Mekki, A., de Melo, J.P.B.C., Meziani, Z.E., Milner, R., Mkrtchyan, H., Mochalov, V., Mokeev, V., Morozov, V., Moutarde, H., Murray, M., Mtingwa, S., Nadel-Turonski, P., Okorokov, V.A., Onyie, E., Pappalardo, L.L., Papandreou, Z., Pecar, C., Pilloni, A., Pire, B., Polys, N., Prokudin, A., Przybycien, M., Qiu, J.-W., Radici, M., Reed, R., Ringer, F., Roy, B.J., Sato, N., Schäfer, A., Schmookler, B., Schnell, G., Schweitzer, P., Seidl, R., Semenov-Tian-Shansky, K.M., Serna, F., Shaban, F., Shabestari, M.H., Shiells, K., Signori, A., Spiesberger, H., Strakovsky, I., Sufian, R.S., Szczepaniak, A., Teodorescu, L., Terry, J., Teryaev, O., Tessarotto, F., Timmer, C., Tawfik, Abdel Nasser, Cazares, L. Valenzuela, Vladimirov, A., Voutier, E., Watts, D., Wilson, D., Winney, D., Xiao, B., Ye, Z., Ye, Zh., Yuan, F., Zachariou, N., Zahed, I., Zhang, J.L., Zhang, Y., and Zhou, J.
Published: 2023
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37. Beam-helicity asymmetries for single-hadron production in semi-inclusive deep-inelastic scattering from unpolarized hydrogen and deuterium targets

Author: HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Belostotski, S., Blok, H. P., Bryzgalov, V., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Deconinck, W., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Elbakian, G., Ellinghaus, F., Fantoni, A., Felawka, L., Gapienko, G., Garibaldi, F., Gavrilov, G., Gharibyan, V., Hillenbrand, A., Holler, Y., Ivanilov, A., Jackson, H. E., Joosten, S., Kaiser, R., Karyan, G., Kinney, E., Kisselev, A., Korotkov, V., Kozlov, V., Kravchenko, P., Lagamba, L., Lapikás, L., Lehmann, I., Lenisa, P., Lorenzon, W., Manaenkov, S. I., Marianski, B., Marukyan, H., Movsisyan, A., Muccifora, V., Nass, A., Nazaryan, G., Nowak, W. -D., Pappalardo, L. L., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Ryckbosch, D., Schnell, G., Seitz, B., Shibata, T. -A., Shutov, V., Statera, M., Terkulov, A., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vilardi, I., Vogel, C., Yaschenko, S., Zagrebelnyy, V., Zeiler, D., Zihlmann, B., and Zupranski, P.
Subjects: High Energy Physics - Experiment, Nuclear Experiment
Abstract: A measurement of beam-helicity asymmetries for single-hadron production in deep-inelastic scattering is presented. Data from the scattering of 27.6 GeV electrons and positrons off gaseous hydrogen and deuterium targets were collected by the HERMES experiment. The asymmetries are presented separately as a function of the Bjorken scaling variable, the hadron transverse momentum, and the fractional energy for charged pions and kaons as well as for protons and anti-protons. These asymmetries are also presented as a function of the three aforementioned kinematic variables simultaneously.
Published: 2019
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38. Comparing proton momentum distributions in $A=2$ and 3 nuclei via $^2$H $^3$H and $^3$He $(e, e'p)$ measurements

Author: Cruz-Torres, R., Li, S., Hauenstein, F., Schmidt, A., Nguyen, D., Abrams, D., Albataineh, H., Alsalmi, S., Androic, D., Aniol, K., Armstrong, W., Arrington, J., Atac, H., Averett, T., Gayoso, C. Ayerbe, Bai, X., Bane, J., Barcus, S., Beck, A., Bellini, V., Bhatt, H., Bhetuwal, D., Biswas, D., Blyth, D., Boeglin, W., Bulumulla, D., Camsonne, A., Castellanos, J., Chen, J. -P., Cohen, E. O., Covrig, S., Craycraft, K., Dongwi, B., Duer, M., Duran, B., Dutta, D., Fuchey, E., Gal, C., Gautam, T. N., Gilad, S., Gnanvo, K., Gogami, T., Gomez, J., Gu, C., Habarakada, A., Hague, T., Hansen, O., Hattawy, M., Hen, O., Higinbotham, D. W., Hughes, E., Hyde, C., Ibrahim, H., Jian, S., Joosten, S., Karki, A., Karki, B., Katramatou, A. T., Keppel, C., Khachatryan, M., Khachatryan, V., Khanal, A., King, D., King, P., Korover, I., Kutz, T., Lashley-Colthirst, N., Laskaris, G., Li, W., Liu, H., Liyanage, N., Lonardoni, D., Machleidt, R., Marcucci, L. E., Markowitz, P., McClellan, R. E., Meekins, D., Beck, S. Mey-Tal, Meziani, Z. -E., Michaels, R., Mihovilovic, M., Nelyubin, V., Nuruzzaman, N., Nycz, M., Obrecht, R., Olson, M., Ou, L., Owen, V., Pandey, B., Pandey, V., Papadopoulou, A., Park, S., Patsyuk, M., Paul, S., Petratos, G. G., Piasetzky, E., Pomatsalyuk, R., Premathilake, S., Puckett, A. J. R., Punjabi, V., Ransome, R., Rashad, M. N. H., Reimer, P. E., Riordan, S., Roche, J., Sammarruca, F., Santiesteban, N., Sawatzky, B., Segarra, E. P., Schmookler, B., Shahinyan, A., Širch, S., Sparveris, N., Su, T., Suleiman, R., Szumila-Vance, H., Tadepalli, A. S., Tang, L., Tireman, W., Tortorici, F., Urciuoli, G., Viviani, M., Weinstein, L. B., Wojtsekhowski, B., Wood, S., Ye, Z. H., Ye, Z. Y., and Zhang, J.
Subjects: Nuclear Experiment, Nuclear Theory
Abstract: We report the first measurement of the $(e,e'p)$ reaction cross-section ratios for Helium-3 ($^3$He), Tritium ($^3$H), and Deuterium ($d$). The measurement covered a missing momentum range of $40 \le p_{miss} \le 550$ MeV$/c$, at large momentum transfer ($\langle Q^2 \rangle \approx 1.9$ (GeV$/c$)$^2$) and $x_B>1$, which minimized contributions from non quasi-elastic (QE) reaction mechanisms. The data is compared with plane-wave impulse approximation (PWIA) calculations using realistic spectral functions and momentum distributions. The measured and PWIA-calculated cross-section ratios for $^3$He$/d$ and $^3$H$/d$ extend to just above the typical nucleon Fermi-momentum ($k_F \approx 250$ MeV$/c$) and differ from each other by $\sim 20\%$, while for $^3$He/$^3$H they agree within the measurement accuracy of about 3\%. At momenta above $k_F$, the measured $^3$He/$^3$H ratios differ from the calculation by $20\% - 50\%$. Final state interaction (FSI) calculations using the generalized Eikonal Approximation indicate that FSI should change the $^3$He/$^3$H cross-section ratio for this measurement by less than 5\%. If these calculations are correct, then the differences at large missing momenta between the $^3$He/$^3$H experimental and calculated ratios could be due to the underlying $NN$ interaction, and thus could provide new constraints on the previously loosely-constrained short-distance parts of the $NN$ interaction., Comment: 8 pages, 3 figures (4 panels)
Published: 2019
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39. Probing Few-Body Nuclear Dynamics via H3 and He3 (e,e′p)pn Cross-Section Measurements

Author: Cruz-Torres, R, Nguyen, D, Hauenstein, F, Schmidt, A, Li, S, Abrams, D, Albataineh, H, Alsalmi, S, Androic, D, Aniol, K, Armstrong, W, Arrington, J, Atac, H, Averett, T, Gayoso, C Ayerbe, Bai, X, Bane, J, Barcus, S, Beck, A, Bellini, V, Benmokhtar, F, Bhatt, H, Bhetuwal, D, Biswas, D, Blyth, D, Boeglin, W, Bulumulla, D, Camsonne, A, Castellanos, J, Chen, J-P, Cohen, EO, Covrig, S, Craycraft, K, Dongwi, B, Duer, M, Duran, B, Dutta, D, Fuchey, E, Gal, C, Gautam, TN, Gilad, S, Gnanvo, K, Gogami, T, Golak, J, Gomez, J, Gu, C, Habarakada, A, Hague, T, Hansen, O, Hattawy, M, Hen, O, Higinbotham, DW, Hughes, E, Hyde, C, Ibrahim, H, Jian, S, Joosten, S, Kamada, H, Karki, A, Karki, B, Katramatou, AT, Keppel, C, Khachatryan, M, Khachatryan, V, Khanal, A, King, D, King, P, Korover, I, Kutz, T, Lashley-Colthirst, N, Laskaris, G, Li, W, Liu, H, Liyanage, N, Markowitz, P, McClellan, RE, Meekins, D, Beck, S Mey-Tal, Meziani, Z-E, Michaels, R, Mihovilovič, M, Nelyubin, V, Nuruzzaman, N, Nycz, M, Obrecht, R, Olson, M, Ou, L, Owen, V, Pandey, B, Pandey, V, Papadopoulou, A, Park, S, Patsyuk, M, Paul, S, Petratos, GG, Piasetzky, E, Pomatsalyuk, R, Premathilake, S, Puckett, AJR, and Punjabi, V
Subjects: Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Jefferson Lab Hall A Tritium Collaboration, nucl-ex, nucl-th, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract: We report the first measurement of the (e,e^{'}p) three-body breakup reaction cross sections in helium-3 (^{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 state-of-the-art ab initio calculations. Overall good agreement, within ±20%, is observed between data and calculations for the full p_{miss} range for ^{3}H and for 100≤p_{miss}≤350 MeV/c for ^{3}He. Including the effects of rescattering of the outgoing nucleon improves agreement with the data at p_{miss}>250 MeV/c and suggests contributions from charge-exchange (SCX) rescattering. The isoscalar sum of ^{3}He plus ^{3}H, which is largely insensitive to SCX, is described by calculations to within the accuracy of the data over the entire p_{miss} range. This validates current models of the ground state of the three-nucleon system up to very high initial nucleon momenta of 500 MeV/c.
Published: 2020

40. Probing Few-Body Nuclear Dynamics via ^{3}H and ^{3}He (e,e^{'}p)pn Cross-Section Measurements.

Author: Cruz-Torres, R, Nguyen, D, Hauenstein, F, Schmidt, A, Li, S, Abrams, D, Albataineh, H, Alsalmi, S, Androic, D, Aniol, K, Armstrong, W, Arrington, J, Atac, H, Averett, T, Ayerbe Gayoso, C, Bai, X, Bane, J, Barcus, S, Beck, A, Bellini, V, Benmokhtar, F, Bhatt, H, Bhetuwal, D, Biswas, D, Blyth, D, Boeglin, W, Bulumulla, D, Camsonne, A, Castellanos, J, Chen, J-P, Cohen, EO, Covrig, S, Craycraft, K, Dongwi, B, Duer, M, Duran, B, Dutta, D, Fuchey, E, Gal, C, Gautam, TN, Gilad, S, Gnanvo, K, Gogami, T, Golak, J, Gomez, J, Gu, C, Habarakada, A, Hague, T, Hansen, O, Hattawy, M, Hen, O, Higinbotham, DW, Hughes, E, Hyde, C, Ibrahim, H, Jian, S, Joosten, S, Kamada, H, Karki, A, Karki, B, Katramatou, AT, Keppel, C, Khachatryan, M, Khachatryan, V, Khanal, A, King, D, King, P, Korover, I, Kutz, T, Lashley-Colthirst, N, Laskaris, G, Li, W, Liu, H, Liyanage, N, Markowitz, P, McClellan, RE, Meekins, D, Mey-Tal Beck, S, Meziani, Z-E, Michaels, R, Mihovilovič, M, Nelyubin, V, Nuruzzaman, N, Nycz, M, Obrecht, R, Olson, M, Ou, L, Owen, V, Pandey, B, Pandey, V, Papadopoulou, A, Park, S, Patsyuk, M, Paul, S, Petratos, GG, Piasetzky, E, Pomatsalyuk, R, Premathilake, S, Puckett, AJR, and Punjabi, V
Subjects: Jefferson Lab Hall A Tritium Collaboration, nucl-ex, nucl-th, General Physics, Mathematical Sciences, Physical Sciences, Engineering
Abstract: We report the first measurement of the (e,e^{'}p) three-body breakup reaction cross sections in helium-3 (^{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 state-of-the-art ab initio calculations. Overall good agreement, within ±20%, is observed between data and calculations for the full p_{miss} range for ^{3}H and for 100≤p_{miss}≤350 MeV/c for ^{3}He. Including the effects of rescattering of the outgoing nucleon improves agreement with the data at p_{miss}>250 MeV/c and suggests contributions from charge-exchange (SCX) rescattering. The isoscalar sum of ^{3}He plus ^{3}H, which is largely insensitive to SCX, is described by calculations to within the accuracy of the data over the entire p_{miss} range. This validates current models of the ground state of the three-nucleon system up to very high initial nucleon momenta of 500 MeV/c.
Published: 2020

41. First Measurements of the Double-Polarization Observables $F$, $P$, and $H$ in $\omega$ Photoproduction off Transversely Polarized Protons in the $N^\ast$ Resonance Region

Author: Roy, P., Park, S., Crede, V., Anisovich, A. V., Klempt, E., Nikonov, V. A., Sarantsev, A. V., Wei, N. C., Huang, F., Nakayama, K., Adhikari, K. P., Adhikari, S., Angelini, G., Avakian, H., Barion, L., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Brock, J., Brooks, W. K., Burkert, V. D., Cao, F., Carlin, C., Carman, D. S., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Cole, P. L., Contalbrigo, M., Cortes, O., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Diehl, S., Djalali, C., Dugger, M., Dupre, R., Duran, B., Egiyan, H., Ehrhart, M., Alaoui, A. El, Fassi, L. El, Eugenio, P., Fegan, S., Filippi, A., Fradi, A., Gilfoyle, G. P., Girod, F. X., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hanretty, C., Harrison, N., Hattawy, M., Hayward, T. B., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jo, H. S., Johnston, S., Joosten, S., Kabir, M. L., Keith, C. D., Keller, D., Khachatryan, G., Khachatryan, M., Khanal, A., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Kubarovsky, V., Kuleshov, S. V., Kunkel, M. C., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., McKinnon, B., Meekins, D. G., Meyer, C. A., Mineeva, T., Mokeev, V., Montgomery, R. A., Movsisyan, A, Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Payette, D., Phelps, W., Pierce, J., Pogorelko, O., Prok, Y., Protopopescu, D., Raue, B. A., Ripani, M., Riser, D., Ritchie, B. G., Rizzo, A., Rosner, G., Sabatie, F., Salgado, C., Schumacher, R. A., Seely, M. L., Sharabian, Y. G., Shrestha, U., Skorodumina, Iu., Sokhan, D., Soto, O., Sparveris, N., Strakovsky, I. I., Strauch, S., Taiuti, M., Tan, J. A., Torayev, B., Tyler, N., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Wang, R., Watts, D. P., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., and Zhao, Z. W.
Subjects: Nuclear Experiment, High Energy Physics - Experiment
Abstract: First measurements of double-polarization observables in $\omega$ photoproduction off the proton are presented using transverse target polarization and data from the CEBAF Large Acceptance Spectrometer (CLAS) FROST experiment at Jefferson Lab. The beam-target asymmetry $F$ has been measured using circularly polarized, tagged photons in the energy range 1200 - 2700 MeV, and the beam-target asymmetries $H$ and $P$ have been measured using linearly polarized tagged photons in the energy range 1200 - 2000 MeV. These measurements significantly increase the database on polarization observables. The results are included in two partial-wave analyses and reveal significant contributions from several nucleon ($N^\ast$) resonances. In particular, contributions from new $N^\ast$ resonances listed in the Review of Particle Properties are observed, which aid in reaching the goal of mapping out the nucleon resonance spectrum., Comment: Two authors added, figures updated
Published: 2018
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42. Longitudinal double-spin asymmetries in semi-inclusive deep-inelastic scattering of electrons and positrons by protons and deuterons

Author: HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Belostotski, S., Blok, H. P., Borissov, A., Bryzgalov, V., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Elbakian, G., Ellinghaus, F., Fantoni, A., Felawka, L., Frullani, S., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Hasch, D., Holler, Y., Ivanilov, A., Jackson, H. E., Joosten, S., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Korotkov, V., Kozlov, V., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Lapikás, L., Lehmann, I., Lorenzon, W., Ma, B. -Q., Mahon, D., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Miyachi, Y., Movsisyan, A., Muccifora, V., Mussgiller, A., Naryshkin, Y., Nass, A., Nazaryan, G., Nowak, W. -D., Pappalardo, L. L., Perez-Benito, R., Petrosyan, A., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Salomatin, Y., Schnell, G., Seitz, B., Shibata, T. -A., Statera, M., Steffens, E., Steijger, J. J. M., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., van der Nat, P. B., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Vogel, C., Wang, S., Yaschenko, S., Zihlmann, B., and Zupranski, P.
Subjects: High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract: A comprehensive collection of results on longitudinal double-spin asymmetries is presented for charged pions and kaons produced in semi-inclusive deep-inelastic scattering of electrons and positrons on the proton and deuteron, based on the full HERMES data set. The dependence of the asymmetries on hadron transverse momentum and azimuthal angle extends the sensitivity to the flavor structure of the nucleon beyond the distribution functions accessible in the collinear framework. No strong dependence on those variables is observed. In addition, the hadron charge-difference asymmetry is presented, which under certain model assumptions provides access to the helicity distributions of valence quarks.
Published: 2018
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43. Comparing proton momentum distributions in A = 2 and 3 nuclei via 2H 3H and 3He (e,e′p) measurements

Author: Cruz-Torres, R, Li, S, Hauenstein, F, Schmidt, A, Nguyen, D, Abrams, D, Albataineh, H, Alsalmi, S, Androic, D, Aniol, K, Armstrong, W, Arrington, J, Atac, H, Averett, T, Ayerbe Gayoso, C, Bai, X, Bane, J, Barcus, S, Beck, A, Bellini, V, Bhatt, H, Bhetuwal, D, Biswas, D, Blyth, D, Boeglin, W, Bulumulla, D, Camsonne, A, Castellanos, J, Chen, JP, Cohen, EO, Covrig, S, Craycraft, K, Dongwi, B, Duer, M, Duran, B, Dutta, D, Fuchey, E, Gal, C, Gautam, TN, Gilad, S, Gnanvo, K, Gogami, T, Gomez, J, Gu, C, Habarakada, A, Hague, T, Hansen, O, Hattawy, M, Hen, O, Higinbotham, DW, Hughes, E, Hyde, C, Ibrahim, H, Jian, S, Joosten, S, Karki, A, Karki, B, Katramatou, AT, Keppel, C, Khachatryan, M, Khachatryan, V, Khanal, A, King, D, King, P, Korover, I, Kutz, T, Lashley-Colthirst, N, Laskaris, G, Li, W, Liu, H, Liyanage, N, Lonardoni, D, Machleidt, R, Marcucci, LE, Markowitz, P, McClellan, RE, Meekins, D, Mey-Tal Beck, S, Meziani, ZE, Michaels, R, Mihovilovič, M, Nelyubin, V, Nuruzzaman, N, Nycz, M, Obrecht, R, Olson, M, Ou, L, Owen, V, Pandey, B, Pandey, V, Papadopoulou, A, Park, S, Patsyuk, M, Paul, S, Petratos, GG, Piasetzky, E, Pomatsalyuk, R, Premathilake, S, Puckett, AJR, and Punjabi, V
Subjects: nucl-ex, nucl-th, Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: We report the first measurement of the (e,e′p) reaction cross-section ratios for Helium-3 (He3), Tritium (H3), and Deuterium (d). The measurement covered a missing momentum range of 40≤pmiss≤550MeV/c, at large momentum transfer (〈Q2〉≈1.9 (GeV/c)2) and xB>1, which minimized contributions from non quasi-elastic (QE) reaction mechanisms. The data is compared with plane-wave impulse approximation (PWIA) calculations using realistic spectral functions and momentum distributions. The measured and PWIA-calculated cross-section ratios for He3/d and H3/d extend to just above the typical nucleon Fermi-momentum (kF≈250 MeV/c) and differ from each other by ∼20%, while for He3/H3 they agree within the measurement accuracy of about 3%. At momenta above kF, the measured He3/H3 ratios differ from the calculation by 20%−50%. Final state interaction (FSI) calculations using the generalized Eikonal Approximation indicate that FSI should change the He3/H3 cross-section ratio for this measurement by less than 5%. If these calculations are correct, then the differences at large missing momenta between the He3/H3 experimental and calculated ratios could be due to the underlying NN interaction, and thus could provide new constraints on the previously loosely-constrained short-distance parts of the NN interaction.
Published: 2019

44. Comparing proton momentum distributions in A = 2 and 3 nuclei via 2H 3H and 3He (e,e′p) measurements

Author: Collaboration, Jefferson Lab Hall A Tritium, Cruz-Torres, R, Li, S, Hauenstein, F, Schmidt, A, Nguyen, D, Abrams, D, Albataineh, H, Alsalmi, S, Androic, D, Aniol, K, Armstrong, W, Arrington, J, Atac, H, Averett, T, Gayoso, C Ayerbe, Bai, X, Bane, J, Barcus, S, Beck, A, Bellini, V, Bhatt, H, Bhetuwal, D, Biswas, D, Blyth, D, Boeglin, W, Bulumulla, D, Camsonne, A, Castellanos, J, Chen, J-P, Cohen, EO, Covrig, S, Craycraft, K, Dongwi, B, Duer, M, Duran, B, Dutta, D, Fuchey, E, Gal, C, Gautam, TN, Gilad, S, Gnanvo, K, Gogami, T, Gomez, J, Gu, C, Habarakada, A, Hague, T, Hansen, O, Hattawy, M, Hen, O, Higinbotham, DW, Hughes, E, Hyde, C, Ibrahim, H, Jian, S, Joosten, S, Karki, A, Karki, B, Katramatou, AT, Keppel, C, Khachatryan, M, Khachatryan, V, Khanal, A, King, D, King, P, Korover, I, Kutz, T, Lashley-Colthirst, N, Laskaris, G, Li, W, Liu, H, Liyanage, N, Lonardoni, D, Machleidt, R, Marcucci, LE, Markowitz, P, McClellan, RE, Meekins, D, Beck, S Mey-Tal, Meziani, Z-E, Michaels, R, Mihovilovič, M, Nelyubin, V, Nuruzzaman, N, Nycz, M, Obrecht, R, Olson, M, Ou, L, Owen, V, Pandey, B, Pandey, V, Papadopoulou, A, Park, S, Patsyuk, M, Paul, S, Petratos, GG, Piasetzky, E, Pomatsalyuk, R, Premathilake, S, and Puckett, AJR
Subjects: Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, nucl-ex, nucl-th, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: We report the first measurement of the (e,e′p) reaction cross-section ratios for Helium-3 (He3), Tritium (H3), and Deuterium (d). The measurement covered a missing momentum range of 40≤pmiss≤550MeV/c, at large momentum transfer (〈Q2〉≈1.9 (GeV/c)2) and xB>1, which minimized contributions from non quasi-elastic (QE) reaction mechanisms. The data is compared with plane-wave impulse approximation (PWIA) calculations using realistic spectral functions and momentum distributions. The measured and PWIA-calculated cross-section ratios for He3/d and H3/d extend to just above the typical nucleon Fermi-momentum (kF≈250 MeV/c) and differ from each other by ∼20%, while for He3/H3 they agree within the measurement accuracy of about 3%. At momenta above kF, the measured He3/H3 ratios differ from the calculation by 20%−50%. Final state interaction (FSI) calculations using the generalized Eikonal Approximation indicate that FSI should change the He3/H3 cross-section ratio for this measurement by less than 5%. If these calculations are correct, then the differences at large missing momenta between the He3/H3 experimental and calculated ratios could be due to the underlying NN interaction, and thus could provide new constraints on the previously loosely-constrained short-distance parts of the NN interaction.
Published: 2019

45. Probing the gluonic structure of the nucleon through quarkonium production

Author: Joosten, S.
Subjects: High Energy Physics - Phenomenology, High Energy Physics - Experiment, Nuclear Experiment
Abstract: Heavy quarkonium production will provide for novel opportunities to study the gluonic structure of the nucleon in the near future. Near threshold quarkonium production allows for direct experimental access of the dynamic origin of the nucleon mass as well as the nature of the color Van der Waals force, while quarkonium production at high energies can be used to create a full three-dimensional tomographic image of the gluons inside the nucleon, constraining the gluonic radius of the nucleon.
Published: 2018

46. Science Requirements and Detector Concepts for the Electron-Ion Collider: EIC Yellow Report

Author: Abdul Khalek, R., Accardi, A., Adam, J., Adamiak, D., Akers, W., Albaladejo, M., Al-bataineh, A., Alexeev, M.G., Ameli, F., Antonioli, P., Armesto, N., Armstrong, W.R., Arratia, M., Arrington, J., Asaturyan, A., Asai, M., Aschenauer, E.C., Aune, S., Avagyan, H., Ayerbe Gayoso, C., Azmoun, B., Bacchetta, A., Baker, M.D., Barbosa, F., Barion, L., Barish, K.N., Barry, P.C., Battaglieri, M., Bazilevsky, A., Behera, N.K., Benmokhtar, F., Berdnikov, V.V., Bernauer, J.C., Bertone, V., Bhattacharya, S., Bissolotti, C., Boer, D., Boglione, M., Bondì, M., Boora, P., Borsa, I., Bossù, F., Bozzi, G., Brandenburg, J.D., Brei, N., Bressan, A., Brooks, W.K., Bufalino, S., Bukhari, M.H.S., Burkert, V., Buttimore, N.H., Camsonne, A., Celentano, A., Celiberto, F.G., Chang, W., Chatterjee, C., Chen, K., Chetry, T., Chiarusi, T., Chien, Y.-T., Chiosso, M., Chu, X., Chudakov, E., Cicala, G., Cisbani, E., Cloet, I.C., Cocuzza, C., Cole, P.L., Colella, D., Collins, J.L., II, Constantinou, M., Contalbrigo, M., Contin, G., Corliss, R., Cosyn, W., Courtoy, A., Crafts, J., Cruz-Torres, R., Cuevas, R.C., D'Alesio, U., Dalla Torre, S., Das, D., Dasgupta, S.S., Da Silva, C., Deconinck, W., Defurne, M., DeGraw, W., Dehmelt, K., Del Dotto, A., Delcarro, F., Deshpande, A., Detmold, W., De Vita, R., Diefenthaler, M., Dilks, C., Dixit, D.U., Dulat, S., Dumitru, A., Dupré, R., Durham, J.M., Echevarria, M.G., El Fassi, L., Elia, D., Ent, R., Esha, R., Ethier, J.J., Evdokimov, O., Eyser, K.O., Fanelli, C., Fatemi, R., Fazio, S., Fernandez-Ramirez, C., Finger, M., Finger, M., Jr., Fitzgerald, D., Flore, C., Frederico, T., Friščić, I., Fucini, S., Furletov, S., Furletova, Y., Gal, C., Gamberg, L., Gao, H., Garg, P., Gaskell, D., Gates, K., Gay Ducati, M.B., Gericke, M., Gil Da Silveira, G., Girod, F.-X., Glazier, D.I., Gnanvo, K., Goncalves, V.P., Gonella, L., Gonzalez Hernandez, J.O., Goto, Y., Grancagnolo, F., Greiner, L.C., Guryn, W., Guzey, V., Hatta, Y., Hattawy, M., Hauenstein, F., He, X., Hemmick, T.K., Hen, O., Heyes, G., Higinbotham, D.W., Hiller Blin, A.N., Hobbs, T.J., Hohlmann, M., Horn, T., Hou, T.-J., Huang, J., Huang, Q., Huber, G.M., Hyde, C.E., Iakovidis, G., Ilieva, Y., Jacak, B.V., Jacobs, P.M., Jadhav, M., Janoska, Z., Jentsch, A., Jezo, T., Jing, X., Jones, P.G., Joo, K., Joosten, S., Kafka, V., Kalantarians, N., Kalicy, G., Kang, D., Kang, Z.B., Kauder, K., Kay, S.J.D., Keppel, C.E., Kim, J., Kiselev, A., Klasen, M., Klein, S., Klest, H.T., Korchak, O., Kostina, A., Kotko, P., Kovchegov, Y.V., Krelina, M., Kuleshov, S., Kumano, S., Kumar, K.S., Kumar, R., Kumar, L., Kumerički, K., Kusina, A., Kutak, K., Lai, Y.S., Lalwani, K., Lappi, T., Lauret, J., Lavinsky, M., Lawrence, D., Lednicky, D., Lee, C., Lee, K., Lee, S.H., Levorato, S., Li, H., Li, S., Li, W., Li, X., Li, W.B., Ligonzo, T., Liu, H., Liu, M.X., Liu, X., Liuti, S., Liyanage, N., Lorcé, C., Lu, Z., Lucero, G., Lukow, N.S., Lunghi, E., Majka, R., Makris, Y., Mandjavidze, I., Mantry, S., Mäntysaari, H., Marhauser, F., Markowitz, P., Marsicano, L., Mastroserio, A., Mathieu, V., Mehtar-Tani, Y., Melnitchouk, W., Mendez, L., Metz, A., Meziani, Z.-E., Mezrag, C., Mihovilovič, M., Milner, R., Mirazita, M., Mkrtchyan, H., Mkrtchyan, A., Mochalov, V., Moiseev, V., Mondal, M.M., Morreale, A., Morrison, D., Motyka, L., Moutarde, H., Muñoz Camacho, C., Murgia, F., Murray, M.J., Musico, P., Nadel-Turonski, P., Nadolsky, P.M., Nam, J., Newman, P.R., Neyret, D., Nguyen, D., Nocera, E.R., Noferini, F., Noto, F., Nunes, A.S., Okorokov, V.A., Olness, F., Osborn, J.D., Page, B.S., Park, S., Parker, A., Paschke, K., Pasquini, B., Paukkunen, H., Paul, S., Pecar, C., Pegg, I.L., Pellegrino, C., Peng, C., Pentchev, L., Perrino, R., Petriello, F., Petti, R., Pilloni, A., Pinkenburg, C., Pire, B., Pisano, C., Pitonyak, D., Poblaguev, A.A., Polakovic, T., Posik, M., Potekhin, M., Preghenella, R., Preins, S., Prokudin, A., Pujahari, P., Purschke, M.L., Pybus, J.R., Radici, M., Rajput-Ghoshal, R., Reimer, P.E., Rinaldi, M., Ringer, F., Roberts, C.D., Rodini, S., Rojo, J., Romanov, D., Rossi, P., Santopinto, E., Sarsour, M., Sassot, R., Sato, N., Schenke, B., Schmidke, W.B., Schmidt, I., Schmidt, A., Schmookler, B., Schnell, G., Schweitzer, P., Schwiening, J., Scimemi, I., Scopetta, S., Segovia, J., Seidl, R., Sekula, S., Semenov-Tian-Shanskiy, K., Shao, D.Y., Sherrill, N., Sichtermann, E., Siddikov, M., Signori, A., Singh, B.K., Širca, S., Slifer, K., Slominski, W., Sokhan, D., Sondheim, W.E., Song, Y., Soto, O., Spiesberger, H., Stasto, A.M., Stepanov, P., Sterman, G., Stevens, J.R., Stewart, I.W., Strakovsky, I., Strikman, M., Sturm, M., Stutzman, M.L., Sullivan, M., Surrow, B., Svihra, P., Syritsyn, S., Szczepaniak, A., Sznajder, P., Szumila-Vance, H., Szymanowski, L., Tadepalli, A.S., Tapia Takaki, J.D., Tassielli, G.F., Terry, J., Tessarotto, F., Tezgin, K., Tomasek, L., Torales Acosta, F., Tribedy, P., Tricoli, A., Triloki, Tripathi, S., Trotta, R.L., Tsai, O.D., Tu, Z., Tuvè, C., Ullrich, T., Ungaro, M., Urciuoli, G.M., Valentini, A., Vancura, P., Vandenbroucke, M., Van Hulse, C., Varner, G., Venugopalan, R., Vitev, I., Vladimirov, A., Volpe, G., Vossen, A., Voutier, E., Wagner, J., Wallon, S., Wang, H., Wang, Q., Wang, X., Wei, S.Y., Weiss, C., Wenaus, T., Wennlöf, H., Wickramaarachchi, N., Wikramanayake, A., Winney, D., Wong, C.P., Woody, C., Xia, L., Xiao, B.W., Xie, J., Xing, H., Xu, Q.H., Zhang, J., Zhang, S., Zhang, Z., Zhao, Z.W., Zhao, Y.X., Zheng, L., Zhou, Y., and Zurita, P.
Published: 2022
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47. Nucleon and nuclear structure through dilepton production

Author: Anikin, I. V., Batzell, N., Boer, M., Boussarie, R., Braun, V. M., Brodsky, S. J., Camsonne, A., Chang, W. C., Colaneri, L., Dobbs, S., Efremov, A. V., Gnanvo, K., Gryniuk, O., Guidal, M., Guzey, V., Hyde, C. E., Ilieva, Y., Joosten, S., Kroll, P., Kumericki, K., Meziani, Z. -E., Müller, D., Semenov-Tian-Shansky, K. M., Stepanyan, S., Szymanowski, L., Tadevosyan, V., Teryaev, O. V., Vanderhaeghen, M., Voutier, E., Wagner, J., Weiss, C., and Zhao, Z. W.
Subjects: Nuclear Experiment, High Energy Physics - Phenomenology
Abstract: Transverse momentum distributions and generalized parton distributions provide a comprehensive framework for the three-dimensional imaging of the nucleon and the nucleus experimentally using deeply virtual semi-exclusive 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 time-like virtual probes, in complement to the rich on-going space-like 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 for Theoretical Studies in Nuclear Physics and Related Areas (ECT$^{\star}$) of Trento. Particularly, the double deeply virtual Compton scattering, the time-like Compton scattering, the deeply virtual meson production, and the Drell-Yan processes are reviewed and a strategy for high impact experimental measurements is proposed., Comment: 21 pages, 23 figures, Conference proceedings
Published: 2017
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48. Double $K_S^0$ Photoproduction off the Proton at CLAS

Author: Chandavar, S., Goetz, J. T., Hicks, K., Keller, D., Kunkel, M. C., Paolone, M., Weygand, D. P., Adhikari, K. P., Adhikari, S., Akbar, Z., Ball, J., Balossino, I., Barion, L., Bashkanov, M., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Cao, F., Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Djalali, C., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Eugenio, P., Fedotov, G., Filippi, A., Fradi, A., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Glazier, D. I., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jenkins, D., Johnston, S., Joo, K., Joosten, S., Kabir, M. L., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I. J. D., Markov, N., McCracken, M. E., McKinnon, B., Meyer, C. A., Mineeva, T., Mokeev, V., Movsisyan, A, Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Raue, B. A., Ripani, M., Riser, D., Ritchie, B. G., Rizzo, A., Rosner, G., Sabatie, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Simonyan, A., Skorodumina, Iu., Sokhan, D., Smith, G. D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Ungaro, M., Voutier, E., Wei, X., Zachariou, N., Zhang, J., and Zhao, Z. W.
Subjects: Nuclear Experiment
Abstract: The $f_0$(1500) meson resonance is one of several contenders to have significant mixing with the lightest glueball. This resonance is well established from several previous experiments. Here we present the first photoproduction data for the $f_0$(1500) via decay into the $K_S^0 K_S^0$ channel using the CLAS detector. The reaction $\gamma p$ -> $f_0 p$ -> $K_S^0 K_S^0 p$, where J = 0, 2, was measured with photon energies from 2.7 to 5.1 GeV. A clear peak is seen at 1500 MeV in the background subtracted invariant mass spectra of the two kaons. This is enhanced if the measured 4-momentum transfer to the proton target is restricted to be less than 1.0 GeV2. By comparing data with simulations, it can be concluded that the peak at 1500 MeV is produced primarily at low t, which is consistent with a t-channel production mechanism., Comment: 12 pages, 12 figures
Published: 2017
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49. Measurement of the beam asymmetry $\Sigma$ and the target asymmetry $T$ in the photoproduction of $\omega$ mesons off the proton using CLAS at Jefferson Laboratory

Author: Roy, P., Akbar, Z., Park, S., Crede, V., Anisovich, A. V., Denisenko, I., Klempt, E., Nikonov, V. A., Sarantsev, A. V., Adhikari, K. P., Adhikari, S., Pereira, S. Anefalos, Ball, J., Balossino, I., Bashkanov, M., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Brock, J., Brooks, W. K., Burkert, V. D., Carlin, C., Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clary, B. A., Cole, P. L., Contalbrigo, M., D'Angelo, A., Dashyan, N., De Vita, R., Deur, A., Djalali, C., Dugger, M., Dupre, R., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Fradi, A., Gavalian, G., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Hattawy, M., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Joo, K., Joosten, S., Keith, C. D., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuleshov, S. V., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I. J. D., Markov, N., Mayer, M., McCracken, M. E., McKinnon, B., Meekins, D. G., Meyer, C. A., Meziani, Z. E., Mineeva, T., Mokeev, V., Montgomery, R. A., Movsisyan, A., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, E., Phelps, W., Pierce, J. J., Pogorelko, O., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B. A., Ripani, M., Riser, D., Ritchie, B. G., Rizzo, A., Rosner, G., Sabatie, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu., Smith, G. D., Sober, D. I., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tan, J. A., Torayev, B., Ungaro, M., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., and Zhao, Z. W.
Subjects: Nuclear Experiment, High Energy Physics - Experiment
Abstract: The photoproduction of $\omega$ mesons off the proton has been studied in the reaction $\gamma p\to p\,\omega$ using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (FROST) in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry, $T$, has been measured in photoproduction from the decay $\omega\to\pi^+\pi^-\pi^0$, using a transversely-polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant non-zero values are observed for these asymmetries, reaching about 30-40% in the third-resonance region. New measurements for the photon-beam asymmetry, $\Sigma$, are also presented, which agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional $\omega$-photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from $s$-channel resonance production were found in addition to $t$-channel exchange processes., Comment: 15 pages, 10 figures, author list and references updated
Published: 2017
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50. Measurement of the Q^2 Dependence of the Deuteron Spin Structure Function g_1 and its Moments at Low Q^2 with CLAS

Author: Adhikari, K. P., Deur, A., Fassi, L. El, Kang, H., Kuhn, S. E., Ripani, M., Slifer, K., Zheng, X., Adhikari, S., Akbar, Z., Amaryan, M. J., Avakian, H., Ball, J., Balossino, I., Barion, L., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Bosted, P., Briscoe, W. J., Brock, J., Bueltmann, S., Burkert, V. D., Cao, F. Thanh, Carlin, C., Carman, D. S., Celentano, A., Charles, G., Chen, J. -P., Chetry, T., Choi, S., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Djalali, C., Dodge, G. E., Drozdov, V., Dupre, R., Egiyan, H., Alaoui, A. El, Elouadrhiri, L., Eugenio, P., Fedotov, G., Filippi, A., Ghandilyan, Y., Gilfoyle, G. P., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guler, N., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Hyde, C. E., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jenkins, D., Jo, H. S., Johnston, S. C., Joo, K., Joosten, S., Kabir, M. L., Keith, C. D., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, W., Klein, A., Klein, F. J., Konczykowski, P., Kovacs, K., Kubarovsky, V., Lanza, L., Lenisa, P., Livingston, K., Long, E., MacGregor, I . J . D., Markov, N., Mayer, M., McKinnon, B., Meekins, D. G., Meyer, C. A., Mineeva, T., Mirazita, M., Mokeev, V., Movsisyan, A, Camacho, C. Munoz, Nadel-Turonski, P., Niculescu, G., Niccolai, S., Osipenko, M., Ostrovidov, A. I., Paolone, M., Pappalardo, L., Paremuzyan, R., Park, K., Pasyuk, E., Payette, D., Phelps, W., Phillips, S. K., Pierce, J., Pogorelko, O., Poudel, J., Price, J. W., Prok, Y., Protopopescu, D., Raue, B. A., Rizzo, A., Rosner, G., Rossi, P., Sabatie, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Shigeyuki, T., Simonyan, A., Skorodumina, Iu., Smith, G. D., Sparveris, N., Sokhan, D., Stepanyan, S., Strakovsky, I. I., Strauch, S., Sulkosky, V., Taiuti, M., Tan, J. A., Ungaro, M., Voutier, E., Wei, X., Weinstein, L. B., Zhang, J., and Zhao., Z. W.
Subjects: Nuclear Experiment
Abstract: We measured the $g_1$ spin structure function of the deuteron at low $Q^{2}$, where QCD can be approximated with chiral perturbation theory ($\chi$PT). The data cover the resonance region, up to an invariant mass of $W\approx1.9$~GeV. The generalized Gerasimov-Drell-Hearn sum, the moment $\bar{\Gamma}_{1}^{d}$ and the integral $\bar{I}_\gamma^d$ related to the spin polarizability $\gamma_{0}^{d}$ are precisely determined down to a minimum $Q^2$ of 0.02~GeV$^2$ for the first time, about 2.5 times lower than that of previous data. We compare them to several $\chi$PT calculations and models. These results are the first in a program of benchmark measurements of polarization observables in the $\chi$PT domain., Comment: Version 1: version published in Phys. Rev. Lett. 6 pages, 3 figures. Supplementary material: data table for g1d and its moments (10 pages) V2: Figures labels changed and text slightly modified to clarify the exact nature of the measured moments V3: Corrected a typo page 5 for the theoretical value expected for deuteron GDH sum rule (agreement between measurement and expectation is improved)
Published: 2017
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