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157 results on '"Barcus, S"'

1. The EMC Effect of Tritium and Helium-3 from the JLab MARATHON Experiment

Author

Abrams, D., Albataineh, H., Aljawrneh, B. S., 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., Cloët, I. C., Cohen, E. O., Covrig, S., Craycraft, K., Cruz-Torres, R., Dongwi, B., Duran, B., Dutta, D., Fomin, N., 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., Salmè, G., Santiesteban, N., Sawatzky, B., Scopetta, S., Schmidt, A., Schmookler, B., Segal, J., Segarra, E. P., Shahinyan, A., Širca, 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
Nuclear Experiment
Abstract

Measurements of the EMC effect in the tritium and helium-3 mirror nuclei are reported. The data were obtained by the MARATHON Jefferson Lab experiment, which performed deep inelastic electron scattering from deuterium and the three-body nuclei, using a cryogenic gas target system and the High Resolution Spectrometers of the Hall A Facility of the Lab. The data cover the Bjorken $x$ range from 0.20 to 0.83, corresponding to a squared four-momentum transfer $Q^2$ range from 2.7 to $11.9\gevsq$, and to an invariant mass $W$ of the final hadronic state greater than 1.84 GeV/${\it c}^2$. The tritium EMC effect measurement is the first of its kind. The MARATHON experimental results are compared to results from previous measurements by DESY-HERMES and JLab-Hall C experiments, as well as with few-body theoretical predictions., Comment: arXiv admin note: text overlap with arXiv:2104.05850

Published
2024

2. Quasielastic $\overrightarrow{^{3}\mathrm{He}}(\overrightarrow{e},{e'})$ Asymmetry in the Threshold Region

Author

Nycz, M., Armstrong, W., Averett, T., Gayoso, C. Ayerbe, Bai, X., Bane, J., Barcus, S., Benesch, J., Bhatt, H., Bhetuwal, D., Biswas, D., Camsonne, A., Cates, G., Chen, J-P., Chen, J., Chen, M., Cotton, C., Dalton, M-M., Deltuva, A., Deur, A., Dhital, B., Duran, B., Dusa, S. C., Fernando, I., Fuchey, E., Gamage, B., Gao, H., Gaskell, D., Gautam, T., Gauthier, N., Golak, J., Hansen, J. -O., Hauenstein, F., Henry, W., Higinbotham, D. W., Huber, G., Jantzi, C., Jia, S., Jin, K., Jones, M., Joosten, S., Karki, A., Karki, B., Katugampola, S., Kay, S., Keppel, C., King, E., King, P., Korsch, W., Kumar, V., Li, R., Li, S., Li, W., Mack, D., Malace, S., Markowitz, P., Matter, J., McCaughan, M., Meziani, Z-E., Michaels, R., Mkrtchyan, A., Mkrtchyan, H., Morean, C., Nelyubin, V., Niculescu, G., Niculescu, M., Peng, C., Premathilake, S., Puckett, A., Rathnayake, A., Rehfuss, M., Reimer, P., Riley, G., Roblin, Y., Roche, J., Roy, M., Sauer, P. U., Scopeta, S., Satnik, M., Sawatzky, B., Seeds, S., Širca, S. S., Skibiński, R., Smith, G., Sparveris, N., Szumila-Vance, H., Tadepalli, A., Tadevosyan, V., Tian, Y., Usman, A., Voskanyan, H., Witala, H., Wood, S., Yale, B., Yero, C., Yoon, A., Zhang, J., Zhao, Z., Zheng, X., and Zhou, J.

Subjects
Nuclear Experiment
Abstract

A measurement of the double-spin asymmetry from electron-$^{3}$He scattering in the threshold region of two- and three-body breakup of $^{3}$He was performed at Jefferson Lab, for Q$^{2}$ values of 0.1 and 0.2 (GeV/$c$)$^{2}$. The results of this measurement serve as a stringent test of our understanding of few-body systems. When compared with calculations from plane wave impulse approximation and Faddeev theory, we found that the Faddeev calculations, which use modern nuclear potentials and prescriptions for meson-exchange currents, demonstrate an overall good agreement with data.

Published
2024

3. Inclusive studies of two- and three-nucleon short-range correlations in $^3$H and $^3$He

Author

Li, S., Santiesteban, S. N., Arrington, J., Cruz-Torres, R., Kurbany, L., Abrams, D., Alsalmi, S., Androic, D., Aniol, K., Averett, T., Gayoso, C. Ayerbe, Bane, J., Barcus, S., Barrow, J., Beck, A., Bellini, V., Bhatt, H., Bhetuwal, D., Biswas, D., Bulumulla, D., Camsonne, A., Castellanos, J., Chen, J., Chen, J-P., Chrisman, D., Christy, M. E., Clarke, C., Covrig, S., Craycraft, K., Day, D., Dutta, D., Fuchey, E., Gal, C., Garibaldi, F., Gautam, T. N., Gogami, T., Gomez, J., Guéye, P., Habarakada, A., Hague, T. J., Hansen, J. O., Hauenstein, F., Henry, W., Higinbotham, D. W., Holt, R. J., Hyde, C., Itabashi, K., Kaneta, M., Karki, A., Katramatou, A. T., Keppel, C. E., Khachatryan, M., Khachatryan, V., King, P. M., Korover, I., Kutz, T., Lashley-Colthirst, N., Li, W. B., Liu, H., Liyanage, N., Long, E., Mammei, J., Markowitz, P., McClellan, R. E., Meddi, F., Meekins, D., Beck, S. Mey-Tal, Michaels, R., Mihovilovič, M., Moyer, A., Nagao, S., Nelyubin, V., Nguyen, D., Nycz, M., Olson, M., Ou, L., Owen, V., Palatchi, C., Pandey, B., Papadopoulou, A., Park, S., Paul, S., Petkovic, T., Pomatsalyuk, R., Premathilake, S., Punjabi, V., Ransome, R. D., Reimer, P. E., Reinhold, J., Riordan, S., Roche, J., Rodriguez, V. M., Schmidt, A., Schmookler, B., Segarra, E. P., Shahinyan, A., Širca, S., Slifer, K., Solvignon, P., Su, T., Suleiman, R., Szumila-Vance, H., Tang, L., Tian, Y., Tireman, W., Tortorici, F., Toyama, Y., Uehara, K., Urciuoli, G. M., Votaw, D., Williamson, J., Wojtsekhowski, B., Wood, S., Ye, Z. H., Zhang, J., and Zheng, X.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Inclusive electron scattering at carefully chosen kinematics can isolate scattering from short-range correlations (SRCs), produced through hard, short-distance interactions of nucleons in the nucleus. Because the two-nucleon (2N) SRCs arise from the same N-N interaction in all nuclei, the cross section in the SRC-dominated regime is identical up to an overall scaling factor, and the A/2H cross section ratio is constant in this region. This scaling behavior has been used to identify SRC dominance and to map out the contribution of SRCs for a wide range of nuclei. We examine this scaling behavior at lower momentum transfers using new data on $^2$H, $^3$H, and $^3$He which show that the scaling region is larger than in heavy nuclei. Based on the improved scaling, especially for $^3$H/$^3$He, we examine the ratios at kinematics where three-nucleon SRCs may play an important role. The data for the largest initial nucleon momenta are consistent with isolation of scattering from 3N-SRCs, and suggest that the very-highest momentum nucleons in $^3$He have a nearly isospin-independent momentum configuration, or a small enhancement of the proton distribution.

Published
2024

4. Electroproduction of the Lambda/Sigma^0 hyperons at Q^2~0.5 (GeV/c)^2 at forward angles

Author

Okuyama, K., Itabashi, K., Nagao, S., Nakamura, S. N., Suzuki, K. N., Gogami, T., Pandey, B., Tang, L., Bydžovský, P., Skoupil, D., Mart, T., Abrams, D., Akiyama, T., Androic, D., Aniol, K., Gayoso, C. Ayerbe, Bane, J., Barcus, S., Barrow, J., Bellini, V., Bhatt, H., Bhetuwal, D., Biswas, D., Camsonne, A., Castellanos, J., Chen, J-P., Chen, J., Covrig, S., Chrisman, D., Cruz-Torres, R., Das, R., Fuchey, E., Gnanvo, K., Garibaldi, F., Gautam, T., Gomez, J., Gueye, P., Hague, T. J., Hansen, O., Henry, W., Hauenstein, F., Higinbotham, D. W., Hyde, C. E., Kaneta, M., Keppel, C., Kutz, T., Lashley-Colthirst, N., Li, S., Liu, H., Mammei, J., Markowitz, P., McClellan, R. E., Meddi, F., Meekins, D., Michaels, R., Mihovilovič, M., Moyer, A., Nguyen, D., Nycz, M., Owen, V., Palatchi, C., Park, S., Petkovic, T., Premathilake, S., Reimer, P. E., Reinhold, J., Riordan, S., Rodriguez, V., Samanta, C., Santiesteban, S. N., Sawatzky, B., Širca, S., Slifer, K., Su, T., Tian, Y., Toyama, Y., Uehara, K., Urciuoli, G. M., Votaw, D., Williamson, J., Wojtsekhowski, B., Wood, S. A., Yale, B., Ye, Z., Zhang, J., and Zheng, X.

Subjects
Nuclear Experiment
Abstract

In 2018, the E12-17-003 experiment was conducted at the Thomas Jefferson National Accelerator Facility (JLab) to explore the possible existence of an nnLambda state in the reconstructed missing mass distribution from a tritium gas target [K. N. Suzuki et al., Prog. Theor. Exp. Phys. 2022, 013D01 (2022), B. Pandey et al., Phys. Rev. C 105, L051001 (2022)]. As part of this investigation, data was also collected using a gaseous hydrogen target, not only for a precise absolute mass scale calibration but also for the study of Lambda/Sigma^0 electroproduction. This dataset was acquired at Q^2~0.5 (GeV/c)^2, W=2.14 GeV, and theta_{gamma K}^{c.m.}~8 deg. It covers forward angles where photoproduction data is scarce and a low-Q^2 region that is of interest for hypernuclear experiments. On the other hand, this kinematic region is at a slightly higher Q^2 than previous hypernuclear experiments, thus providing crucial information for understanding the Q^2 dependence of the differential cross sections for Lambda/Sigma^0 hyperon electroproduction. This paper reports on the Q^2 dependence of the differential cross section for the e + p -> e' + K^+ + Lambda/Sigma^0 reaction in the 0.2-0.8 (GeV/c)^2, and provides comparisons with the currently available theoretical models., Comment: 11 pages, 15 figures

Published
2024

5. Novel Measurement of the Neutron Magnetic Form Factor from A=3 Mirror Nuclei

Author

Santiesteban, SN, Li, S, Abrams, D, Alsalmi, S, Androic, D, Aniol, K, Arrington, J, Averett, T, Gayoso, C Ayerbe, Bane, J, Barcus, S, Barrow, J, Beck, A, Bellini, V, Bhatt, H, Bhetuwal, D, Biswas, D, Camsonne, A, Castellanos, J, Chen, J, Chen, J-P, Chrisman, D, Christy, ME, Clarke, C, Covrig, S, Cruz-Torres, R, Day, D, Dutta, D, Fuchey, E, Gal, C, Garibaldi, F, Gautam, TN, Gogami, T, Gomez, J, Guèye, P, Hague, TJ, Hansen, JO, Hauenstein, F, Henry, W, Higinbotham, DW, Holt, RJ, Hyde, C, Itabashi, K, Kaneta, M, Karki, A, Katramatou, AT, Keppel, CE, King, PM, Kurbany, L, Kutz, T, Lashley-Colthirst, N, Li, WB, Liu, H, Liyanage, N, Long, E, Lovato, A, Mammei, J, Markowitz, P, McClellan, RE, Meddi, F, Meekins, D, Michaels, R, Mihovilovič, M, Moyer, A, Nagao, S, Nguyen, D, Nycz, M, Olson, M, Ou, L, Owen, V, Palatchi, C, Pandey, B, Papadopoulou, A, Park, S, Petkovic, T, Premathilake, S, Punjabi, V, Ransome, RD, Reimer, PE, Reinhold, J, Riordan, S, Rocco, N, Rodriguez, VM, Schmidt, A, Schmookler, B, Segarra, EP, Shahinyan, A, Širca, S, Slifer, K, Solvignon, P, Su, T, Suleiman, R, Tang, L, Tian, Y, Tireman, W, Tortorici, F, Toyama, Y, Uehara, K, Urciuoli, GM, and Votaw, D

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Jefferson Lab Hall A Collaboration, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract

The electromagnetic form factors of the proton and neutron encode information on the spatial structure of their charge and magnetization distributions. While measurements of the proton are relatively straightforward, the lack of a free neutron target makes measurements of the neutron's electromagnetic structure more challenging and more sensitive to experimental or model-dependent uncertainties. Various experiments have attempted to extract the neutron form factors from scattering from the neutron in deuterium, with different techniques providing different, and sometimes large, systematic uncertainties. We present results from a novel measurement of the neutron magnetic form factor using quasielastic scattering from the mirror nuclei ^{3}H and ^{3}He, where the nuclear effects are larger than for deuterium but expected to largely cancel in the cross-section ratios. We extracted values of the neutron magnetic form factor for low-to-modest momentum transfer, 0.6

Published
2024

6. A novel measurement of the neutron magnetic form factor from A=3 mirror nuclei

Author

Santiesteban, S. N., Li, S., Abrams, D., Alsalmi, S., Androic, D., Aniol, K., Arrington, J., Averett, T., Gayoso, C. Ayerbe, Bane, J., Barcus, S., Barrow, J., Beck, A., Bellini, V., Bhatt, H., Bhetuwal, D., Biswas, D., Camsonne, A., Castellanos, J., Chen, J., Chen, J-P., Chrisman, D., Christy, M. E., Clarke, C., Covrig, S., Cruz-Torres, R., Day, D., Dutta, D., Fuchey, E., Gal, C., Garibaldi, F., Gautam, T. N., Gogami, T., Gomez, J., Gueye, P., Hague, T. J., Hansen, J. O., Hauenstein, F., Henry, W., Higinbotham, D. W., Holt, R. J., Hyde, C., Itabashi, K., Kaneta, M., Karki, A., Katramatou, A. T., Keppel, C. E., King, P. M., Kurbany, L., Kutz, T., Lashley-Colthirst, N., Li, W. B., Liu, H., Liyanage, N., Long, E., Lovato, A., Mammei, J., Markowitz, P., McClellan, R. E., Meddi, F., Meekins, D., Michaels, R., Mihovilovic, M., Moyer, A., Nagao, S., Nguyen, D., Nycz, M., Olson, M., Ou, L., Owen, V., Palatchi, C., Pandey, B., Papadopoulou, A., Park, S., Petkovic, T., Premathilake, 6 S., Punjabi, V., Ransome, R. D., Reimer, P. E., Reinhold, J., Riordan, S., Rocco, N., Rodriguez, V. M., Schmidt, A., Schmookler, B., Segarra, E. P., Shahinyan, A., Sirca, S., Slifer, K., Solvignon, P., Su, T., Suleiman, R., Tang, L., Tian, Y., Tireman, W., Tortorici, F., Toyama, Y., Uehara, K., Urciuoli, G. M., Votaw, D., Williamson, J., Wojtsekhowski, B., Wood, S., Ye, Z. H., Zhang, J., and Zheng, X.

Subjects
Nuclear Experiment
Abstract

The electromagnetic form factors of the proton and neutron encode information on the spatial structure of their charge and magnetization distributions. While measurements of the proton are relatively straightforward, the lack of a free neutron target makes measurements of the neutron's electromagnetic structure more challenging and more sensitive to experimental or model-dependent uncertainties. Various experiments have attempted to extract the neutron form factors from scattering from the neutron in deuterium, with different techniques providing different, and sometimes large, systematic uncertainties. We present results from a novel measurement of the neutron magnetic form factor using quasielastic scattering from the mirror nuclei $^3$H and $^3$He, where the nuclear effects are larger than for deuterium but expected to largely cancel in the cross-section ratios. We extracted values of the neutron magnetic form factor for low-to-modest momentum transfer, $0.6

Published
2023

7. Revealing the short-range structure of the 'mirror nuclei' $^3$H and $^3$He

Author

Li, S., Cruz-Torres, R., Santiesteban, N., Ye, Z. H., Abrams, D., Alsalmi, S., Androic, D., Aniol, K., Arrington, J., Averett, T., Gayoso, C. Ayerbe, Bane, J., Barcus, S., Barrow, J., Beck, A., Bellini, V., Bhatt, H., Bhetuwal, D., Biswas, D., Bulumulla, D., Camsonne, A., Castellanos, J., Chen, J., Chen, J-P., Chrisman, D., Christy, M. E., Clarke, C., Covrig, S., Craycraft, K., Day, D., Dutta, D., Fuchey, E., Gal, C., Garibaldi, F., Gautam, T. N., Gogami, T., Gomez, J., Guèye, P., Habarakada, A., Hague, T. J., Hansen, J. O., Hauenstein, F., Henry, W., Higinbotham, D. W., Holt, R. J., Hyde, C., Itabashi, T., Kaneta, M., Karki, A., Katramatou, A. T., Keppel, C. E., Khachatryan, M., Khachatryan, V., King, P. M., Korover, I., Kurbany, L., Kutz, T., Lashley-Colthirst, N., Li, W. B., Liu, H., Liyanage, N., Long, E., Mammei, J., Markowitz, P., McClellan, R. E., Meddi, F., Meekins, D., Beck, S. Mey-Tal, Michaels, R., Mihovilovič, M., Moyer, A., Nagao, S., Nelyubin, V., Nguyen, D., Nycz, M., Olson, M., Ou, L., Owen, V., Palatchi, C., Pandey, B., Papadopoulou, A., Park, S., Paul, S., Petkovic, T., Pomatsalyuk, R., Premathilake, S., Punjabi, V., Ransome, R. D., Reimer, P. E., Reinhold, J., Riordan, S., Roche, J., Rodriguez, V. M., Schmidt, A., Schmookler, B., Segarra, E. P., Shahinyan, A., Slifer, K., Solvignon, P., Širca, S., Su, T., Suleiman, R., Szumila-Vance, H., Tang, L., Tian, Y., Tireman, W., Tortorici, F., Toyama, Y., Uehara, K., Urciuoli, G. M., Votaw, D., Williamson, J., Wojtsekhowski, B., Wood, S., Zhang, J., and Zheng, X.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, Nuclear Theory
Abstract

When protons and neutrons (nucleons) are bound into atomic nuclei, they are close enough together to feel significant attraction, or repulsion, from the strong, short-distance part of the nucleon-nucleon interaction. These strong interactions lead to hard collisions between nucleons, generating pairs of highly-energetic nucleons referred to as short-range correlations (SRCs). SRCs are an important but relatively poorly understood part of nuclear structure and mapping out the strength and isospin structure (neutron-proton vs proton-proton pairs) of these virtual excitations is thus critical input for modeling a range of nuclear, particle, and astrophysics measurements. Hitherto measurements used two-nucleon knockout or ``triple-coincidence'' reactions to measure the relative contribution of np- and pp-SRCs by knocking out a proton from the SRC and detecting its partner nucleon (proton or neutron). These measurementsshow that SRCs are almost exclusively np pairs, but had limited statistics and required large model-dependent final-state interaction (FSI) corrections. We report on the first measurement using inclusive scattering from the mirror nuclei $^3$H and $^3$He to extract the np/pp ratio of SRCs in the A=3 system. We obtain a measure of the np/pp SRC ratio that is an order of magnitude more precise than previous experiments, and find a dramatic deviation from the near-total np dominance observed in heavy nuclei. This result implies an unexpected structure in the high-momentum wavefunction for $^3$He and $^3$H. Understanding these results will improve our understanding of the short-range part of the N-N interaction.

Published
2022
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8. Determination of the titanium spectral function from (e,e'p) data

Author

Jiang, L., Ankowski, A. M., Abrams, D., Gu, L., Aljawrneh, B., Alsalmi, S., Bane, J., Batz, A., Barcus, S., Barroso, M., Bellini, V., Benhar, O., Bericic, J., Biswas, D., Camsonne, A., Castellanos, J., Chen, J. -P., Christy, M. E., Craycraft, K., Cruz-Torres, R., Dai, H., Day, D., Dirican, A., Dusa, S. -C., Fuchey, E., Gautam, T., Giusti, C., Gomez, J., Gu, C., Hague, T. J., Hansen, J. -O., Hauenstein, F., Higinbotham, D. W., Hyde, C., Jerzyk, Z., Johnson, A. M., Keppel, C., Lanham, C., Li, S., Lindgren, R., Liu, H., Mariani, C., McClellan, R. E., Meekins, D., Michaels, R., Mihovilovic, M., Murphy, M., Nguyen, D., Nycz, M., Ou, L., Pandey, B., Pandey, V., Park, K., Perera, G., Puckett, A. J. R., Santiesteban, S. N., Širca, S., Su, T., Tang, L., Tian, Y., Ton, N., Wojtsekhowski, B., Wood, S., Ye, Z., and Zhang, J.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, Nuclear Theory
Abstract

The E12-14-012 experiment, performed in Jefferson Lab Hall A, has measured the (e,e'p) cross section in parallel kinematics using a natural titanium target. Here, we report the full results of the analysis of the data set corresponding to beam energy 2.2 GeV, and spanning the missing momentum and missing energy range 15 <= pm <= 250 MeV/c and 12 <= Em <= 80 MeV. The reduced cross section has been measured with ~7% accuracy as function of both missing momentum and missing energy. We compared our data to the results of a Monte Carlo simulations performed using a model spectral function and including the effects of final state interactions. The overall agreement between data and simulations is quite good (chi2/d.o.f. = 0.9)., Comment: 6 pages, 4 figures, published in Phys. Rev. D. arXiv admin note: substantial text overlap with arXiv:2203.01748

Published
2022
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9. Determination of the titanium spectral function from (e, e′p) data

Author

Jiang, L, Ankowski, AM, Abrams, D, Gu, L, Aljawrneh, B, Alsalmi, S, Bane, J, Batz, A, Barcus, S, Barroso, M, Bellini, V, Benhar, O, Bericic, J, Biswas, D, Camsonne, A, Castellanos, J, Chen, J-P, Christy, ME, Craycraft, K, Cruz-Torres, R, Dai, H, Day, D, Dirican, A, Dusa, S-C, Fuchey, E, Gautam, T, Giusti, C, Gomez, J, Gu, C, Hague, TJ, Hansen, J-O, Hauenstein, F, Higinbotham, DW, Hyde, C, Jerzyk, Z, Johnson, AM, Keppel, C, Lanham, C, Li, S, Lindgren, R, Liu, H, Mariani, C, McClellan, RE, Meekins, D, Michaels, R, Mihovilovic, M, Murphy, M, Nguyen, D, Nycz, M, Ou, L, Pandey, B, Pandey, V, Park, K, Perera, G, Puckett, AJR, Santiesteban, SN, Širca, S, Su, T, Tang, L, Tian, Y, Ton, N, Wojtsekhowski, B, Wood, S, Ye, Z, and Zhang, J

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

The E12-14-012 experiment, performed in Jefferson Lab Hall A, has measured the (e,e′p) cross section in parallel kinematics using a natural titanium target. In this paper, we report the analysis of the dataset obtained in different kinematics for our solid natural titanium target. Data were obtained in a range of missing momentum and missing energy between 15?pm?250 MeV/c and 12?Em?80 MeV, respectively, and using an electron beam energy of 2.2 GeV. We measured the reduced cross section with ∼7% accuracy as a function of both missing momentum and missing energy. Our Monte Carlo simulation, including both a model spectral function and the effects of final-state interactions, satisfactorily reproduces the data.

Published
2023

10. Precision Determination of the Neutral Weak Form Factor of $^{48}$Ca

Author

Adhikari, D., Albataineh, H., Androic, D., Aniol, K. A., Armstrong, D. S., Averett, T., Gayoso, C. Ayerbe, Barcus, S. K., Bellini, V., Beminiwattha, R. S., Benesch, J. F., Bhatt, H., Pathak, D. Bhatta, Bhetuwal, D., Blaikie, B., Boyd, J., Campagna, Q., Camsonne, A., Cates, G. D., Chen, Y., Clarke, C., Cornejo, J. C., Dusa, S. Covrig, Dalton, M. M., Datta, P., Deshpande, A., Dutta, D., Feldman, C., Fuchey, E., Gal, C., Gaskell, D., Gautam, T., Gericke, M., Ghosh, C., Halilovic, I., Hansen, J. -O., Hassan, O., Hauenstein, F., Henry, W., Horowitz, C. J., Jantzi, C., Jian, S., Johnston, S., Jones, D. C., Kakkar, S., Katugampola, S., Keppel, C., King, P. M., King, D. E., Kumar, K. S., Kutz, T., Lashley-Colthirst, N., Leverick, G., Liu, H., Liyanage, N., Mammei, J., Mammei, R., McCaughan, 23 M., McNulty, D., Meekins, D., Metts, C., Michaels, R., Mihovilovic, M., Mondal, M. M., Napolitano, J., Narayan, A., Nikolaev, D., Owen, V., Palatchi, C., Pan, J., Pandey, B., Park, S., Paschke, K. D., Petrusky, M., Pitt, M. L., Premathilake, S., Quinn, B., Radloff, R., Rahman, S., Rashad, M. N. H., Rathnayake, A., Reed, B. T., Reimer, P. E., Richards, R., Riordan, S., Roblin, Y. R., Seeds, S., Shahinyan, A., Souder, P., Thiel, M., Tian, Y., Urciuoli, G. M., Wertz, E. W., Wojtsekhowski, B., Yale, B., Ye, T., Yoon, A., Xiong, W., Zec, A., Zhang, W., Zhang, J., and Zheng, X.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

We report a precise measurement of the parity-violating asymmetry $A_{\rm PV}$ in the elastic scattering of longitudinally polarized electrons from $^{48}{\rm Ca}$. We measure $A_{\rm PV} =2668\pm 106\ {\rm (stat)}\pm 40\ {\rm (syst)}$ parts per billion, leading to an extraction of the neutral weak form factor $F_{\rm W} (q=0.8733$ fm$^{-1}) = 0.1304 \pm 0.0052 \ {\rm (stat)}\pm 0.0020\ {\rm (syst)}$ and the charge minus the weak form factor $F_{\rm ch} - F_{\rm W} = 0.0277\pm 0.0055$. The resulting neutron skin thickness $R_n-R_p=0.121 \pm 0.026\ {\rm (exp)} \pm 0.024\ {\rm (model)}$~fm is relatively thin yet consistent with many model calculations. The combined CREX and PREX results will have implications for future energy density functional calculations and on the density dependence of the symmetry energy of nuclear matter., Comment: 8 pages, 5 figures Replace 6-16-22: included ancillary files, corrected errors in references, author affiliations. Small text changes for clarity

Published
2022
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11. Determination of the argon spectral function from (e,e'p) data

Author

Jiang, L., Ankowski, A. M., Abrams, D., Gu, L., Aljawrneh, B., Alsalmi, S., Bane, J., Batz, A., Barcus, S., Barroso, M., Bellini, V., Benhar, O., Bericic, J., Biswas, D., Camsonne, A., Castellanos, J., Chen, J. -P., Christy, M. E., Craycraft, K., Cruz-Torres, R., Dai, H., Day, D., Dirican, A., Dusa, S. -C., Fuchey, E., Gautam, T., Giusti, C., Gomez, J., Gu, C., Hague, T. J., Hansen, J. -O., Hauenstein, F., Higinbotham, D. W., Hyde, C., Jerzyk, Z., Keppel, C., Li, S., Lindgren, R., Liu, H., Mariani, C., McClellan, R. E., Meekins, D., Michaels, R., Mihovilovic, M., Murphy, M., Nguyen, D., Nycz, M., Ou, L., Pandey, B., Pandey, V., Park, K., Perera, G., Puckett, A. J. R., Santiesteban, S. N., Širca, S., Su, T., Tang, L., Tian, Y., Ton, N., Wojtsekhowski, B., Wood, S., Ye, Z., and Zhang, J.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

The E12-14-012 experiment, performed in Jefferson Lab Hall A, has measured the $(e, e'p)$ cross section in parallel kinematics using a natural argon target. Here, we report the full results of the analysis of the data set corresponding to beam energy 2.222 GeV, and spanning the missing momentum and missing energy range $15 \lesssim p_m \lesssim 300$ MeV/c and $12 \lesssim E_m \lesssim 80$ MeV. The reduced cross section, determined as a function of $p_m$ and $E_m$ with $\approx$4\% accuracy, has been fitted using the results of Monte Carlo simulations involving a model spectral function and including the effects of final state interactions. The overall agreement between data and simulations turns out to be quite satisfactory ($\chi^2$/n.d.o.f.=1.9). The resulting spectral function will provide valuable new information, needed for the interpretation of neutrino interactions in liquid argon detectors., Comment: Published version

Published
2022
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12. Revealing the short-range structure of the mirror nuclei 3H and 3He

Author

Li, S, Cruz-Torres, R, Santiesteban, N, Ye, ZH, Abrams, D, Alsalmi, S, Androic, D, Aniol, K, Arrington, J, Averett, T, Gayoso, C Ayerbe, Bane, J, Barcus, S, Barrow, J, Beck, A, Bellini, V, Bhatt, H, Bhetuwal, D, Biswas, D, Bulumulla, D, Camsonne, A, Castellanos, J, Chen, J, Chen, J-P, Chrisman, D, Christy, ME, Clarke, C, Covrig, S, Craycraft, K, Day, D, Dutta, D, Fuchey, E, Gal, C, Garibaldi, F, Gautam, TN, Gogami, T, Gomez, J, Guèye, P, Habarakada, A, Hague, TJ, Hansen, JO, Hauenstein, F, Henry, W, Higinbotham, DW, Holt, RJ, Hyde, C, Itabashi, T, Kaneta, M, Karki, A, Katramatou, AT, Keppel, CE, Khachatryan, M, Khachatryan, V, King, PM, Korover, I, Kurbany, L, Kutz, T, Lashley-Colthirst, N, Li, WB, Liu, H, Liyanage, N, Long, E, Mammei, J, Markowitz, P, McClellan, RE, Meddi, F, Meekins, D, Beck, S Mey-Tal, Michaels, R, Mihovilovič, M, Moyer, A, Nagao, S, Nelyubin, V, Nguyen, D, Nycz, M, Olson, M, Ou, L, Owen, V, Palatchi, C, Pandey, B, Papadopoulou, A, Park, S, Paul, S, Petkovic, T, Pomatsalyuk, R, Premathilake, S, Punjabi, V, Ransome, RD, Reimer, PE, Reinhold, J, Riordan, S, Roche, J, Rodriguez, VM, Schmidt, A, Schmookler, B, Segarra, EP, Shahinyan, A, Slifer, K, Solvignon, P, and Širca, S

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, General Science & Technology
Abstract

When protons and neutrons (nucleons) are bound into atomic nuclei, they are close enough to feel significant attraction, or repulsion, from the strong, short-distance part of the nucleon-nucleon interaction. These strong interactions lead to hard collisions between nucleons, generating pairs of highly energetic nucleons referred to as short-range correlations (SRCs). SRCs are an important but relatively poorly understood part of nuclear structure1-3, and mapping out the strength and the isospin structure (neutron-proton (np) versus proton-proton (pp) pairs) of these virtual excitations is thus critical input for modelling a range of nuclear, particle and astrophysics measurements3-5. Two-nucleon knockout or 'triple coincidence' reactions have been used to measure the relative contribution of np-SRCs and pp-SRCs by knocking out a proton from the SRC and detecting its partner nucleon (proton or neutron). These measurements6-8 have shown that SRCs are almost exclusively np pairs, but they had limited statistics and required large model-dependent final-state interaction corrections. Here we report on measurements using inclusive scattering from the mirror nuclei hydrogen-3 and helium-3 to extract the np/pp ratio of SRCs in systems with a mass number of three. We obtain a measure of the np/pp SRC ratio that is an order of magnitude more precise than previous experiments, and find a marked deviation from the near-total np dominance observed in heavy nuclei. This result implies an unexpected structure in the high-momentum wavefunction for hydrogen-3 and helium-3. Understanding these results will improve our understanding of the short-range part of the nucleon-nucleon interaction.

Published
2022

13. Deeply virtual Compton scattering cross section at high Bjorken $x_B$

Author

Georges, F., Rashad, M. N. H., Stefanko, A., Dlamini, M., Karki, B., Ali, S. F., Lin, P-J., Ko, H-S, Israel, N., Adikaram, D., Ahmed, Z., Albataineh, H., Aljawrneh, B., Allada, K., Allison, S., Alsalmi, S., Androic, D., Aniol, K., Annand, J., Atac, H., Averett, T., Gayoso, C. Ayerbe, Bai, X., Bane, J., Barcus, S., Bartlett, K., Bellini, V., Beminiwattha, R., Bericic, J., Biswas, D., Brash, E., Bulumulla, D., Campbell, J., Camsonne, A., Carmignotto, M., Castellano, J., Chen, C., Chen, J-P., Chetry, T., Christy, M. E., Cisbani, E., Clary, B., Cohen, E., Compton, N., Cornejo, J. C., Dusa, S. Covrig, Crowe, B., Danagoulian, S., Danley, T., De Persio, F., Deconinck, W., Defurne, M., Desnault, C., Di, D., Duer, M., Duran, B., Ent, R., Fanelli, C., Franklin, G., Fuchey, E., Gal, C., Gaskell, D., Gautam, T., Glamazdin, O., Gnanvo, K., Gray, V. M., Gu, C., Hague, T., Hamad, G., Hamilton, D., Hamilton, K., Hansen, O., Hauenstein, F., Henry, W., Higinbotham, D. W., Holmstrom, T., Horn, T., Huang, Y., Huber, G. M., Hyde, C., Ibrahim, H., Jen, C-M., Jin, K., Jones, M., Kabir, A., Keppel, C., Khachatryan, V., King, P. M., Li, S., Li, W. B., Liu, J., Liu, H., Liyanage, A., Magee, J., Malace, S., Mammei, J., Markowitz, P., McClellan, E., Mazouz, M., Meddi, F., Meekins, D., Mesik, K., Michaels, R., Mkrtchyan, A., Montgomery, R., Camacho, C. Muñoz, Myers, L. S., Nadel-Turonski, P., Nazeer, S. J., Nelyubin, V., Nguyen, D., Nuruzzaman, N., Nycz, M., Obretch, O. F., Ou, L., Palatchi, C., Pandey, B., Park, S., Park, K., Peng, C., Pomatsalyuk, R., Pooser, E., Puckett, A. J. R., Punjabi, V., Quinn, B., Rahman, S., Reimer, P. E., Roche, J., Sapkota, I., Sarty, A., Sawatzky, B., Saylor, N. H., Schmookler, B., Shabestari, M. H., Shahinyan, A., Sirca, S., Smith, G. R., Sooriyaarachchilage, S., Sparveris, N., Spies, R., Su, T., Subedi, A., Sulkosky, V., Sun, A., Thorne, L., Tian, Y., Ton, N., Tortorici, F., Trotta, R., Urciuoli, G. M., Voutier, E., Waidyawansa, B., Wang, Y., Wojtsekhowski, B., Wood, S., Yan, X., Ye, L., Ye, Z., Yero, C., Zhang, J., Zhao, Y., and Zhu, P.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment, Nuclear Experiment
Abstract

We report high-precision measurements of the Deeply Virtual Compton Scattering (DVCS) cross section at high values of the Bjorken variable $x_B$. DVCS is sensitive to the Generalized Parton Distributions of the nucleon, which provide a three-dimensional description of its internal constituents. Using the exact analytic expression of the DVCS cross section for all possible polarization states of the initial and final electron and nucleon, and final state photon, we present the first experimental extraction of all four helicity-conserving Compton Form Factors (CFFs) of the nucleon as a function of $x_B$, while systematically including helicity flip amplitudes. In particular, the high accuracy of the present data demonstrates sensitivity to some very poorly known CFFs.

Published
2022
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14. Determination of the argon spectral function from (e,e′p) data

Author

Jiang, L, Ankowski, AM, Abrams, D, Gu, L, Aljawrneh, B, Alsalmi, S, Bane, J, Batz, A, Barcus, S, Barroso, M, Bellini, V, Benhar, O, Bericic, J, Biswas, D, Camsonne, A, Castellanos, J, Chen, J-P, Christy, ME, Craycraft, K, Cruz-Torres, R, Dai, H, Day, D, Dirican, A, Dusa, S-C, Fuchey, E, Gautam, T, Giusti, C, Gomez, J, Gu, C, Hague, TJ, Hansen, J-O, Hauenstein, F, Higinbotham, DW, Hyde, C, Jerzyk, Z, Keppel, C, Li, S, Lindgren, R, Liu, H, Mariani, C, McClellan, RE, Meekins, D, Michaels, R, Mihovilovic, M, Murphy, M, Nguyen, D, Nycz, M, Ou, L, Pandey, B, Pandey, V, Park, K, Perera, G, Puckett, AJR, Santiesteban, SN, Širca, S, Su, T, Tang, L, Tian, Y, Ton, N, Wojtsekhowski, B, Wood, S, Ye, Z, and Zhang, J

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

The E12-14-012 experiment, performed in Jefferson Lab Hall A, has measured the (e,e′p) cross section in parallel kinematics using a natural argon target. Here, we report the full results of the analysis of the data set corresponding to beam energy 2.222 GeV, and spanning the missing momentum and missing energy range 1 pm 300 MeV/c and 12 Em 80 MeV. The reduced cross section, determined as a function of pm and Em with ≈4% accuracy, has been fitted using the results of Monte Carlo simulations involving a model spectral function and including the effects of final state interactions. The overall agreement between data and simulations turns out to be quite satisfactory (χ2/d.o.f.=1.9). The resulting spectral function will provide valuable new information, needed for the interpretation of neutrino interactions in liquid argon detectors.

Published
2022

15. Deeply Virtual Compton Scattering Cross Section at High Bjorken x_{B}.

Author

Georges, F, Rashad, MNH, Stefanko, A, Dlamini, M, Karki, B, Ali, SF, Lin, P-J, Ko, H-S, Israel, N, Adikaram, D, Ahmed, Z, Albataineh, H, Aljawrneh, B, Allada, K, Allison, S, Alsalmi, S, Androic, D, Aniol, K, Annand, J, Atac, H, Averett, T, Ayerbe Gayoso, C, Bai, X, Bane, J, Barcus, S, Bartlett, K, Bellini, V, Beminiwattha, R, Bericic, J, Biswas, D, Brash, E, Bulumulla, D, Campbell, J, Camsonne, A, Carmignotto, M, Castellano, J, Chen, C, Chen, J-P, Chetry, T, Christy, ME, Cisbani, E, Clary, B, Cohen, E, Compton, N, Cornejo, JC, Covrig Dusa, S, Crowe, B, Danagoulian, S, Danley, T, De Persio, F, Deconinck, W, Defurne, M, Desnault, C, Di, D, Duer, M, Duran, B, Ent, R, Fanelli, C, Franklin, G, Fuchey, E, Gal, C, Gaskell, D, Gautam, T, Glamazdin, O, Gnanvo, K, Gray, VM, Gu, C, Hague, T, Hamad, G, Hamilton, D, Hamilton, K, Hansen, O, Hauenstein, F, Henry, W, Higinbotham, DW, Holmstrom, T, Horn, T, Huang, Y, Huber, GM, Hyde, CE, Ibrahim, H, Jen, C-M, Jin, K, Jones, M, Kabir, A, Keppel, C, Khachatryan, V, King, PM, Li, S, Li, WB, Liu, J, Liu, H, Liyanage, A, Magee, J, Malace, S, Mammei, J, Markowitz, P, McClellan, E, Mazouz, M, and Meddi, F

Subjects
Jefferson Lab Hall A Collaboration, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We report high-precision measurements of the deeply virtual Compton scattering (DVCS) cross section at high values of the Bjorken variable x_{B}. DVCS is sensitive to the generalized parton distributions of the nucleon, which provide a three-dimensional description of its internal constituents. Using the exact analytic expression of the DVCS cross section for all possible polarization states of the initial and final electron and nucleon, and final state photon, we present the first experimental extraction of all four helicity-conserving Compton form factors (CFFs) of the nucleon as a function of x_{B}, while systematically including helicity flip amplitudes. In particular, the high accuracy of the present data demonstrates sensitivity to some very poorly known CFFs.

Published
2022

16. New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering Over a Range of Spin-0 Nuclei

Author

PREX, Collaborations, CREX, Adhikari, D., Albataineh, H., Androic, D., Aniol, K., Armstrong, D. S., Averett, T., Gayoso, C. Ayerbe, Barcus, S., Bellini, V., Beminiwattha, R. S., Benesch, J. F., Bhatt, H., Pathak, D. Bhatta, Bhetuwal, D., Blaikie, B., Boyd, J., Campagna, Q., Camsonne, A., Cates, G. D., Chen, Y., Clarke, C., Cornejo, J. C., Dusa, S. Covrig, Dalton, M. M., Datta, P., Deshpande, A., Dutta, D., Feldman, C., Fuchey, E., Gal, C., Gaskell, D., Gautam, T., Gericke, M., Ghosh, C., Halilovic, I., Hansen, J. -O., Hauenstein, F., Henry, W., Horowitz, C. J., Jantzi, C., Jian, S., Johnston, S., Jones, D. C., Karki, B., Kakkar, S., Katugampola, S., Keppel, C. E., King, P. M., King, D. E., Knauss, M., Kumar, K. S., Kutz, T., Lashley-Colthirst, N., Leverick, G., Liu, H., Liyange, N., Malace, S., Mammei, J., Mammei, R., McCaughan, M., McNulty, D., Meekins, D., Metts, C., Michaels, R., Mihovilovic, M., Mondal, M. M., Napolitano, J., Nikolaev, D., Rashad, M. N. H., Owen, V., Palatchi, C., Pan, J., Pandey, B., Park, S., Paschke, K. D., Petrusky, M., Pitt, M. L., Premathilake, S., Puckett, A. J. R., Quinn, B., Radloff, R., Rahman, S., Rathnayake, A., Reed, B. T., Reimer, P. E., Richards, R., Riordan, S., Roblin, Y., Seeds, S., Shahinyan, A., Souder, P. A., Tang, L., Thiel, M., Tian, Y., Urciuoli, G. M., Wertz, E. W., Wojtsekhowski, B., Xiong, W., Yale, B., Ye, T., Zec, A., Zhang, W., Zhang, J., and Zheng, X.

Subjects
Nuclear Experiment
Abstract

We report precision determinations of the beam normal single spin asymmetries ($A_n$) in the elastic scattering of 0.95 and 2.18~GeV electrons off $^{12}$C, $^{40}$Ca, $^{48}$Ca, and $^{208}$Pb at very forward angles where the most detailed theoretical calculations have been performed. The first measurements of $A_n$ for $^{40}$Ca and $^{48}$Ca are found to be similar to that of $^{12}$C, consistent with expectations thus demonstrating the validity of theoretical calculations for nuclei with Z~$\leq20$. We also report $A_n$ for $^{208}$Pb at two new momentum transfers (Q$^2$) extending the previous measurement. Our new data confirm the surprising result previously reported, with all three data points showing significant disagreement with the results from the $Z\leq 20$ nuclei. These data confirm our basic understanding of the underlying dynamics that govern $A_n$ for nuclei containing $\lesssim 50$ nucleons, but point to the need for further investigation to understand the unusual $A_n$ behaviour discovered for scattering off $^{208}$Pb., Comment: 7 pages, 2 figures

Published
2021
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17. The cross-section measurement for the $^3{\textrm H}(e,e'K^+)nn\Lambda$ reaction

Author

Suzuki, K. N., Gogami, T., Pandey, B., Itabashi, K., Nagao, S., Okuyama, K., Nakamura, S. N., Tang, L., Abrams, D., Akiyama, T., Androic, D., Aniol, K., Gayoso, C. Ayerbe, Bane, J., Barcus, S., Barrow, J., Bellini, V., Bhatt, H., Bhetuwal, D., Biswas, D., Camsonne, A., Castellanos, J., Chen, J-P., Chen, J., Covrig, S., Chrisman, D., Cruz-Torres, R., Das, R., Fuchey, E., Gnanvo, K., Garibaldi, F., Gautam, T., Gomez, J., Gueye, P., Hague, T. J., Hansen, O., Henry, W., Hauenstein, F., Higinbotham, D. W., Hyde, C. E., Kaneta, M., Keppel, C., Kutz, T., Lashley-Colthirst, N., Li, S., Liu, H., Mammei, J., Markowitz, P., McClellan, R. E., Meddi, F., Meekins, D., Michaels, R., Mihovilovič, M., Moyer, A., Nguyen, D., Nycz, M., Owen, V., Palatchi, C., Park, S., Petkovic, T., Premathilake, S., Reimer, P. E., Reinhold, J., Riordan, S., Rodriguez, V., Samanta, C., Santiesteban, S. N., Sawatzky, B., Širca, S., Slifer, K., Su, T., Tian, Y., Toyama, Y., Uehara, K., Urciuoli, G. M., Votaw, D., Williamson, J., Wojtsekhowski, B., Wood, S. A., Yale, B., Ye, Z., Zhang, J., and Zheng, X.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The small binding energy of the hypertrition leads to predictions of non-existence of bound hypernuclei for isotriplet three-body systems such as $nn\Lambda$. However, invariant mass spectroscopy at GSI has reported events that may be interpreted as the bound $nn\Lambda$ state. The $nn\Lambda$ state was sought by missing-mass spectroscopy via the $(e,e'K^+)$ reaction at Jefferson Lab's experimental Hall A. The present experiment has higher sensitivity to the $nn\Lambda$-state investigation in terms of better precision by a factor of about three. The analysis shown in this article focuses on the derivation of the reaction cross-section for the $^3{\rm{H}}(\gamma^{*},K^+)\textrm{X}$ reaction. Events that were detected in an acceptance, where a Monte Carlo simulation could reproduce the data well ($|\delta p/p| < 4\%$), were analyzed to minimize the systematic uncertainty. No significant structures were observed with the acceptance cuts, and the upper limits of the production cross-section of the $nn\Lambda$ state were obtained to be $21$ and $31~\rm{nb/sr}$ at the $90\%$ confidence level when theoretical predictions of $(-B_{\Lambda}, \Gamma) = (0.25,0.8)$ and $(0.55, 4.7)$ MeV, respectively, were assumed. The cross-section result provides valuable information for examining the existence of $nn\Lambda$., Comment: 27 pages, 12 figures

Published
2021
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18. Spectroscopic study of a possible Λnn resonance and a pair of ΣNN states using the (e,e′K+) reaction with a tritium target

Author

Pandey, B, Tang, L, Gogami, T, Suzuki, KN, Itabashi, K, Nagao, S, Okuyama, K, Nakamura, SN, Abrams, D, Afnan, IR, Akiyama, T, Androic, D, Aniol, K, Averett, T, Gayoso, C Ayerbe, Bane, J, Barcus, S, Barrow, J, Bellini, V, Bhatt, H, Bhetuwal, D, Biswas, D, Camsonne, A, Castellanos, J, Chen, J-P, Chen, J, Covrig, S, Chrisman, D, Cruz-Torres, R, Das, R, Fuchey, E, Gal, C, Gibson, BF, Gnanvo, K, Garibaldi, F, Gautam, T, Gomez, J, Gueye, P, Hague, TJ, Hansen, O, Henry, W, Hauenstein, F, Higinbotham, DW, Hyde, C, Kaneta, M, Keppel, C, Kutz, T, Lashley-Colthirst, N, Li, S, Liu, H, Mammei, J, Markowitz, P, McClellan, RE, Meddi, F, Meekins, D, Michaels, R, Mihovilovič, M, Moyer, A, Nguyen, D, Nycz, M, Owen, V, Palatchi, C, Park, S, Petkovic, T, Premathilake, S, Reimer, PE, Reinhold, J, Riordan, S, Rodriguez, V, Samanta, C, Santiesteban, SN, Sawatzky, B, Širca, S, Slifer, K, Su, T, Tian, Y, Toyama, Y, Uehara, K, Urciuoli, GM, Votaw, D, Williamson, J, Wojtsekhowski, B, Wood, S, Yale, B, Ye, Z, Zhang, J, and Zheng, X

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Nuclear and plasma physics
Abstract

A mass spectroscopy experiment with a pair of nearly identical high-resolution spectrometers and a tritium target was performed in Hall A at Jefferson Lab. Utilizing the (e,e′K+) reaction, enhancements, which may correspond to a possible Λnn resonance and a pair of ςNN states, were observed with an energy resolution of about 1.21 MeV (σ), although greater statistics are needed to make definitive identifications. An experimentally measured Λnn state may provide a unique constraint in determining the Λn interaction, for which no scattering data exist. In addition, although bound A=3 and 4 ς hypernuclei have been predicted, only an A=4 ς hypernucleus (Heς4) was found, utilizing the (K-,π-) reaction on a He4 target. The possible bound ςNN state is likely a ς0nn state, although this has to be confirmed by future experiments.

Published
2022

19. 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

20. Form Factors and Two-Photon Exchange in High-Energy Elastic Electron-Proton Scattering

Author

Christy, ME, Gautam, T, Ou, L, Schmookler, B, Wang, Y, Adikaram, D, Ahmed, Z, Albataineh, H, Ali, SF, Aljawrneh, B, Allada, K, Allison, SL, Alsalmi, S, Androic, D, Aniol, K, Annand, J, Arrington, J, Atac, H, Averett, T, Gayoso, C Ayerbe, Bai, X, Bane, J, Barcus, S, Bartlett, K, Bellini, V, Beminiwattha, R, Bericic, J, Bhatt, H, Bhetuwal, D, Biswas, D, Brash, E, Bulumulla, D, Camacho, CM, Campbell, J, Camsonne, A, Carmignotto, M, Castellanos, J, Chen, C, Chen, J-P, Chetry, T, Cisbani, E, Clary, B, Cohen, E, Compton, N, Cornejo, JC, Dusa, S Covrig, Crowe, B, Danagoulian, S, Danley, T, Deconinck, W, Defurne, M, Desnault, C, Di, D, Dlamini, M, Duer, M, Duran, B, Ent, R, Fanelli, C, Fuchey, E, Gal, C, Gaskell, D, Georges, F, Gilad, S, Glamazdin, O, Gnanvo, K, Gramolin, AV, Gray, VM, Gu, C, Habarakada, A, Hague, T, Hamad, G, Hamilton, D, Hamilton, K, Hansen, O, Hauenstein, F, Hernandez, AV, Henry, W, Higinbotham, DW, Holmstrom, T, Horn, T, Huang, Y, Huber, GM, Hyde, C, Ibrahim, H, Israel, N, Jen, C-M, Jin, K, Jones, M, Kabir, A, Karki, B, Keppel, C, Khachatryan, V, King, PM, Li, S, Li, W, Liu, H, Liu, J, Liyanage, AH, Mack, D, and Magee, J

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract

We present new precision measurements of the elastic electron-proton scattering cross section for momentum transfer (Q^{2}) up to 15.75  (GeV/c)^{2}. Combined with existing data, these provide an improved extraction of the proton magnetic form factor at high Q^{2} and double the range over which a longitudinal or transverse separation of the cross section can be performed. The difference between our results and polarization data agrees with that observed at lower Q^{2} and attributed to hard two-photon exchange (TPE) effects, extending to 8  (GeV/c)^{2} the range of Q^{2} for which a discrepancy is established at >95% confidence. We use the discrepancy to quantify the size of TPE contributions needed to explain the cross section at high Q^{2}.

Published
2022

21. The cross-section measurement for the 3H(e, e′K+)nnΛ reaction

Author

Suzuki, KN, Gogami, T, Pandey, B, Itabashi, K, Nagao, S, Okuyama, K, Nakamura, SN, Tang, L, Abrams, D, Akiyama, T, Androic, D, Aniol, K, Gayoso, C Ayerbe, Bane, J, Barcus, S, Barrow, J, Bellini, V, Bhatt, H, Bhetuwal, D, Biswas, D, Camsonne, A, Castellanos, J, Chen, J-P, Chen, J, Covrig, S, Chrisman, D, Cruz-Torres, R, Das, R, Fuchey, E, Gnanvo, K, Garibaldi, F, Gautam, T, Gomez, J, Gueye, P, Hague, TJ, Hansen, O, Henry, W, Hauenstein, F, Higinbotham, DW, Hyde, CE, Kaneta, M, Keppel, C, Kutz, T, Lashley-Colthirst, N, Li, S, Liu, H, Mammei, J, Markowitz, P, McClellan, RE, Meddi, F, Meekins, D, Michaels, R, Mihovilovič, M, Moyer, A, Nguyen, D, Nycz, M, Owen, V, Palatchi, C, Park, S, Petkovic, T, Premathilake, S, Reimer, PE, Reinhold, J, Riordan, S, Rodriguez, V, Samanta, C, Santiesteban, SN, Sawatzky, B, Širca, S, Slifer, K, Su, T, Tian, Y, Toyama, Y, Uehara, K, Urciuoli, GM, Votaw, D, Williamson, J, Wojtsekhowski, B, Wood, SA, Yale, B, Ye, Z, Zhang, J, and Zheng, X

Subjects
Mathematical Sciences, Physical Sciences
Abstract

The small binding energy of the hypertriton leads to predictions of the non-existence of bound hypernuclei for isotriplet three-body systems such as nnΛ. However, invariant mass spectroscopy at GSI has reported events that may be interpreted as the bound nnΛ state. The nnΛ state was sought by missing-mass spectroscopy via the (e, e′K+) reaction at Jefferson Lab's experimental Hall A. The present experiment has higher sensitivity to the nnΛ-state investigation in terms of better precision by a factor of about three. The analysis shown in this article focuses on the derivation of the reaction cross-section for the 3H(γ∗, K+)X reaction. Events that were detected in an acceptance, where a Monte Carlo simulation could reproduce the data well (δ p/p| < 4), were analyzed to minimize the systematic uncertainty. No significant structures were observed with the acceptance cuts, and the upper limits of the production cross-section of the nnΛ state were obtained to be 21 and 31 nb sr-1 at the $90\%$ confidence level when theoretical predictions of (-BΛ, Γ) = (0.25, 0.8) MeV and (0.55, 4.7) MeV, respectively, were assumed. The cross-section result provides valuable information for examining the existence of nnΛ.

Published
2022

22. 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

23. Form Factors and Two-Photon Exchange in High-Energy Elastic Electron-Proton Scattering

Author

Christy, M. E., Gautam, T., Ou, L., Schmookler, B., Wang, Y., Adikaram, D., Ahmed, Z., Albataineh, H., Ali, S. F., Aljawrneh, B., Allada, K., Allison, S. L., Alsalmi, S., Androic, D., Aniol, K., Annand, J., Arrington, J., Atac, H., Averett, T., Gayoso, C. Ayerbe, Bai, X., Bane, J., Barcus, S., Bartlett, K., Bellini, V., Beminiwattha, R., Bericic, J., Bhatt, H., Bhetuwal, D., Biswas, D., Brash, E., Bulumulla, D., Camacho, C. M., Campbell, J., Camsonne, A., Carmignotto, M., Castellanos, J., Chen, C., Chen, J-P., Chetry, T., Cisbani, E., Clary, B., Cohen, E., Compton, N., Cornejo, J. C., Dusa, S. Covrig, Crowe, B., Danagoulian, S., Danley, T., Deconinck, W., Defurne, M., Desnault, C., Di, D., Dlamini, M., Duer, M., Duran, B., Ent, R., Fanelli, C., Fuchey, E., Gal, C., Gaskell, D., Georges, F., Gilad, S., Glamazdin, O., Gnanvo, K., Gramolin, A. V., Gray, V. M., Gu, C., Habarakada, A., Hague, T., Hamad, G., Hamilton, D., Hamilton, K., Hansen, O., Hauenstein, F., Hernandez, A. V., Henry, W., Higinbotham, D. W., Holmstrom, T., Horn, T., Huang, Y., Huber, G. M., Hyde, C., Ibrahim, H., Israel, N., Jen, C-M., Jin, K., Jones, M., Kabir, A., Karki, B., Keppel, C., Khachatryan, V., King, P. M., Li, S., Li, W., Liu, H., Liu, J., Liyanage, A. H., Mack, D., Magee, J., Malace, S., Mammei, J., Markowitz, P., Mayilyan, S., McClellan, E., Meddi, F., Meekins, D., Mesick, K., Michaels, R., Mkrtchyan, A., Moffit, B., Montgomery, R., Myers, L. S., Nadel-Turonski, P., Nazeer, S. J., Nelyubin, V., Nguyen, D., Nuruzzaman, N., Nycz, M., Obrecht, R. F., Ohanyan, K., Palatchi, C., Pandey, B., Park, K., Park, S., Peng, C., Persio, F. D., Pomatsalyuk, R., Pooser, E., Puckett, A. J. R., Punjabi, V., Quinn, B., Rahman, S., Rashad, M. N. H., Riordan, S., Roche, J., Sapkota, I., Sarty, A., Sawatzky, B., Saylor, N. H., Shabestari, M. H., Shahinyan, A., Sirca, S., Smith, G. R., Sooriyaarachchilage, S., Sparveris, N., Spies, R., Stefanko, A., Su, T., Subedi, A., Sulkosky, V., Sun, A., Tan, Y., Thorne, L., Ton, N., Tortorici, F., Trotta, R., Uniyal, R., Urciuoli, G. M., Voutier, E., Waidyawansa, B., Wojtsekhowski, B., Wood, S., Yan, X., Ye, L., Ye, Z. H., Yero, C., Zhang, J., Zhao, Y. X., and Zhu, P.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

We present new precision measurements of the elastic electron-proton scattering cross section for momentum transfer (Q$^2$) up to 15.75~\gevsq. Combined with existing data, these provide an improved extraction of the proton magnetic form factor at high Q$^2$ and double the range over which a longitudinal/transverse separation of the cross section can be performed. The difference between our results and polarization data agrees with that observed at lower Q$^2$ and attributed to hard two-photon exchange (TPE) effects, extending to 8~(GeV/c)$^2$ the range of Q$^2$ for which a discrepancy is established at $>$95\% confidence. We use the discrepancy to quantify the size of TPE contributions needed to explain the cross section at high Q$^2$., Comment: 7 pages, 2 figures

Published
2021
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24. Accurate Determination of the Neutron Skin Thickness of $^{208}$Pb through Parity-Violation in Electron Scattering

Author

Adhikari, D., Albataineh, H., Androic, D., Aniol, K., Armstrong, D. S., Averett, T., Barcus, S., Bellini, V., Beminiwattha, R. S., Benesch, J. F., Bhatt, H., Pathak, D. Bhatta, Bhetuwal, D., Blaikie, B., Campagna, Q., Camsonne, A., Cates, G. D., Chen, Y., Clarke, C., Cornejo, J. C., Dusa, S. Covrig, Datta, P., Deshpande, A., Dutta, D., Feldman, C., Fuchey, E., Gal, C., Gaskell, D., Gautam, T., Gayoso, C. Ayerbe, Gericke, M., Ghosh, C., Halilovic, I., Hansen, J. -O., Hauenstein, F., Henry, W., Horowitz, C. J., Jantzi, C., Jian, S., Johnston, S., Jones, D. C., Karki, B., Katugampola, S., Keppel, C., King, P. M., King, D. E., Knauss, M., Kumar, K. S., Kutz, T., Lashley-Colthirst, N., Leverick, G., Liu, H., Liyange, N., Malace, S., Mammei, R., Mammei, J., McCaughan, M., McNulty, D., Meekins, D., Metts, C., Michaels, R., Mondal, M. M., Napolitano, J., Narayan, A., Nikolaev, D., Rashad, M. N. H., Owen, V., Palatchi, C., Pan, 14 J., Pandey, B., Park, S., Paschke, K. D., Petrusky, M., Pitt, M. L., Premathilake, S., Puckett, A. J. R., Quinn, B., Radloff, R., Rahman, S., Rathnayake, A., Reed, B. T., Reimer, P. E., Richards, R., Riordan, S., Roblin, Y., Seeds, S., Shahinyan, A., Souder, P., Tang, L., Thiel, 16 M., Tian, Y., Urciuoli, G. M., Wertz, E. W., Wojtsekhowski, B., Yale, B., Ye, T., Yoon, A., Zec, A., Zhang, W., Zhang, J., and Zheng, X.

Subjects
Nuclear Experiment
Abstract

We report a precision measurement of the parity-violating asymmetry $A_{PV}$ in the elastic scattering of longitudinally polarized electrons from $^{208}$Pb. We measure $A_{PV}=550\pm 16 {\rm (stat)}\pm 8\ {\rm (syst)}$ parts per billion, leading to an extraction of the neutral weak form factor $F_W(Q^2 = 0.00616\ {\rm GeV}^2) = 0.368 \pm 0.013$. Combined with our previous measurement, the extracted neutron skin thickness is $R_n-R_p=0.283 \pm 0.071$~fm. The result also yields the first significant direct measurement of the interior weak density of $^{208}$Pb: $\rho^0_W = -0.0796\pm0.0036\ {\rm (exp.)}\pm0.0013\ {\rm (theo.)}\ {\rm fm}^{-3}$ leading to the interior baryon density $\rho^0_b = 0.1480\pm0.0036\ {\rm (exp.)}\pm0.0013\ {\rm (theo.)}\ {\rm fm}^{-3}$. The measurement accurately constrains the density dependence of the symmetry energy of nuclear matter near saturation density, with implications for the size and composition of neutron stars.

Published
2021
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25. Measurement of the Ar(e,e$^\prime$ p) and Ti(e,e$^\prime$ p) cross sections in Jefferson Lab Hall A

Author

Gu, L., Abrams, D., Ankowski, A. M., Jiang, L., Aljawrneh, B., Alsalmi, S., Bane, J., Batz, A., Barcus, S., Barroso, M., Benhar, O., Bellini, V., Bericic, J., Biswas, D., Camsonne, A., Castellanos, J., Chen, J. -P., Christy, M. E., Craycraft, K., Cruz-Torres, R., Dai, H., Day, D., Dusa, S. -C., Fuchey, E., Gautam, T., Giusti, C., Gomez, J., Gu, C., Hague, T., Hansen, J. -O., Hauenstein, F., Higinbotham, D. W., Hyde, C., Keppel, C., Li, S., Lindgren, R., Liu, H., Mariani, C., McClellan, R. E., Meekins, D., Michaels, R., Mihovilovic, M., Murphy, M., Nguyen, D., Nycz, M., Ou, L., Pandey, B., Pandey, V., Park, K., Perera, G., Puckett, A. J. R., Santiesteban, S. N., Širca, S., Su, T., Tang, L., Tian, Y., Ton, N., Wojtsekhowski, B., Wood, S., Ye, Z., and Zhang, J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The E12-14-012 experiment, performed in Jefferson Lab Hall A, has collected exclusive electron-scattering data (e,e$^\prime$p) in parallel kinematics using natural argon and natural titanium targets. Here, we report the first results of the analysis of the data set corresponding to beam energy of 2,222 MeV, electron scattering angle 21.5 deg, and proton emission angle -50 deg. The differential cross sections, measured with $\sim$4% uncertainty, have been studied as a function of missing energy and missing momentum, and compared to the results of Monte Carlo simulations, obtained from a model based on the Distorted Wave Impulse Approximation., Comment: 14 pages, 8 figures (submitted to PRC)

Published
2020
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26. Deep Exclusive Electroproduction of π0 at High Q2 in the Quark Valence Regime

Author

Dlamini, M, Karki, B, Ali, SF, Lin, P-J, Georges, F, Ko, H-S, Israel, N, Rashad, MNH, Stefanko, A, Adikaram, D, Ahmed, Z, Albataineh, H, Aljawrneh, B, Allada, K, Allison, S, Alsalmi, S, Androic, D, Aniol, K, Annand, J, Atac, H, Averett, T, Ayerbe Gayoso, C, Bai, X, Bane, J, Barcus, S, Bartlett, K, Bellini, V, Beminiwattha, R, Bericic, J, Biswas, D, Brash, E, Bulumulla, D, Campbell, J, Camsonne, A, Carmignotto, M, Castellano, J, Chen, C, Chen, J-P, Chetry, T, Christy, ME, Cisbani, E, Clary, B, Cohen, E, Compton, N, Cornejo, JC, Covrig Dusa, S, Crowe, B, Danagoulian, S, Danley, T, De Persio, F, Deconinck, W, Defurne, M, Desnault, C, Di, D, Duer, M, Duran, B, Ent, R, Fanelli, C, Franklin, G, Fuchey, E, Gal, C, Gaskell, D, Gautam, T, Glamazdin, O, Gnanvo, K, Gray, VM, Gu, C, Hague, T, Hamad, G, Hamilton, D, Hamilton, K, Hansen, O, Hauenstein, F, Henry, W, Higinbotham, DW, Holmstrom, T, Horn, T, Huang, Y, Huber, GM, Hyde, C, Ibrahim, H, Jen, C-M, Jin, K, Jones, M, Kabir, A, Keppel, C, Khachatryan, V, King, PM, Li, S, Li, W, Liu, J, Liu, H, Liyanage, A, Magee, J, Malace, S, Mammei, J, Markowitz, P, McClellan, E, Meddi, F, and Meekins, D

Subjects
Jefferson Lab Hall A Collaboration, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values of x_{B} (0.36, 0.48, and 0.60) and Q^{2} (3.1 to 8.4  GeV^{2}) obtained from Jefferson Lab Hall A experiment E12-06-014. The corresponding structure functions dσ_{T}/dt+εdσ_{L}/dt, dσ_{TT}/dt, dσ_{LT}/dt, and dσ_{LT^{'}}/dt are extracted as a function of the proton momentum transfer t-t_{min}. The results suggest the amplitude for transversely polarized virtual photons continues to dominate the cross section throughout this kinematic range. The data are well described by calculations based on transversity generalized parton distributions coupled to a helicity flip distribution amplitude of the pion, thus providing a unique way to probe the structure of the nucleon.

Published
2021

27. Deep exclusive electroproduction of $\pi^0$ at high $Q^2$ in the quark valence regime

Author

The Jefferson Lab Hall A Collaboration, Dlamini, M., Karki, B., Ali, S. F., Lin, P-J., Georges, F., Ko, H-S, Israel, N., Rashad, M. N. H., Stefanko, A., Adikaram, D., Ahmed, Z., Albataineh, H., Aljawrneh, B., Allada, K., Allison, S., Alsalmi, S., Androic, D., Aniol, K., Annand, J., Atac, H., Averett, T., Gayoso, C. Ayerbe, Bai, X., Bane, J., Barcus, S., Bartlett, K., Bellini, V., Beminiwattha, R., Bericic, J., Biswas, D., Brash, E., Bulumulla, D., Campbell, J., Camsonne, A., Carmignotto, M., Castellano, J., Chen, C., Chen, J-P., Chetry, T., Christy, M. E., Cisbani, E., Clary, B., Cohen, E., Compton, N., Cornejo, J. C., Dusa, S. Covrig, Crowe, B., Danagoulian, S., Danley, T., De Persio, F., Deconinck, W., Defurne, M., Desnault, C., Di, D., Duer, M., Duran, B., Ent, R., Fanelli, C., Franklin, G., Fuchey, E., Gal, C., Gaskell, D., Gautam, T., Glamazdin, O., Gnanvo, K., Gray, V. M., Gu, C., Hague, T., Hamad, G., Hamilton, D., Hamilton, K., Hansen, O., Hauenstein, F., Henry, W., Higinbotham, D. W., Holmstrom, T., Horn, T., Huang, Y., Huber, G. M., Hyde, C., Ibrahim, H., Jen, C-M., Jin, K., Jones, M., Kabir, A., Keppel, C., Khachatryan, V., King, P. M., Li, S., Li, W., Liu, J., Liu, H., Liyanage, A., Magee, J., Malace, S., Mammei, J., Markowitz, P., McClellan, E., Meddi, F., Meekins, D., Mesik, K., Michaels, R., Mkrtchyan, A., Montgomery, R., Camacho, C. Munoz, Myers, L. S., Nadel-Turonski, P., Nazeer, S. J., Nelyubin, V., Nguyen, D., Nuruzzaman, N., Nycz, M., Obretch, O. F., Ou, L., Palatchi, C., Pandey, B., Park, S., Park, K., Peng, C., Pomatsalyuk, R., Pooser, E., Puckett, A. J. R., Punjabi, V., Quinn, B., Rahman, S., Reimer, P. E., Roche, J., Sapkota, I., Sarty, A., Sawatzky, B., Saylor, N. H., Schmookler, B., Shabestari, M. H., Shahinyan, A., Sirca, S., Smith, G. R., Sooriyaarachchilage, S., Sparveris, N., Spies, R., Su, T., Subedi, A., Sulkosky, V., Sun, A., Thorne, L., Tian, Y., Ton, N., Tortorici, F., Trotta, R., Urciuoli, G. M., Voutier, E., Waidyawansa, B., Wang, Y., Wojtsekhowski, B., Wood, S., Yan, X., Ye, L., Ye, Z., Yero, C., Zhang, J., Zhao, Y., and Zhu, P.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values of $x_B$ (0.36, 0.48 and 0.60) and $Q^2$ (3.1 to 8.4 GeV$^2$) obtained from Jefferson Lab Hall A experiment E12-06-014. The corresponding structure functions $d\sigma_L/dt+\epsilon d\sigma_T/dt$, $d\sigma_{TT}/dt$, $d\sigma_{LT}/dt$ and $d\sigma_{LT'}/dt$ are extracted as a function of the proton momentum transfer $t-t_{min}$. The results suggest the amplitude for transversely polarized virtual photons continues to dominate the cross-section throughout this kinematic range. The data are well described by calculations based on transversity Generalized Parton Distributions coupled to a helicity flip Distribution Amplitude of the pion, thus providing a unique way to probe the structure of the nucleon.

Published
2020
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28. 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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29. 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

30. Form Factors and Two-Photon Exchange in High-Energy Elastic Electron-Proton Scattering

Author

Christy, ME, Gautam, T, Ou, L, Schmookler, B, Wang, Y, Adikaram, D, Ahmed, Z, Albataineh, H, Ali, SF, Aljawrneh, B, Allada, K, Allison, SL, Alsalmi, S, Androic, D, Aniol, K, Annand, J, Arrington, J, Atac, H, Averett, T, Gayoso, C Ayerbe, Bai, X, Bane, J, Barcus, S, Bartlett, K, Bellini, V, Beminiwattha, R, Bericic, J, Bhatt, H, Bhetuwal, D, Biswas, D, Brash, E, Bulumulla, D, Camacho, CM, Campbell, J, Camsonne, A, Carmignotto, M, Castellanos, J, Chen, C, Chen, J-P, Chetry, T, Cisbani, E, Clary, B, Cohen, E, Compton, N, Cornejo, JC, Dusa, S Covrig, Crowe, B, Danagoulian, S, Danley, T, Deconinck, W, Defurne, M, Desnault, C, Di, D, Dlamini, M, Duer, M, Duran, B, Ent, R, Fanelli, C, Fuchey, E, Gal, C, Gaskell, D, Georges, F, Gilad, S, Glamazdin, O, Gnanvo, K, Gramolin, AV, Gray, VM, Gu, C, Habarakada, A, Hague, T, Hamad, G, Hamilton, D, Hamilton, K, Hansen, O, Hauenstein, F, Hernandez, AV, Henry, W, Higinbotham, DW, Holmstrom, T, Horn, T, Huang, Y, Huber, GM, Hyde, C, Ibrahim, H, Israel, N, Jen, C-M, Jin, K, Jones, M, Kabir, A, Karki, B, Keppel, C, Khachatryan, V, King, PM, Li, S, Li, W, Liu, H, Liu, J, Liyanage, AH, Mack, D, and Magee, J

Subjects
nucl-ex, hep-ex
Abstract

We present new precision measurements of the elastic electron-protonscattering cross section for momentum transfer (Q$^2$) up to 15.75~\gevsq.Combined with existing data, these provide an improved extraction of the protonmagnetic form factor at high Q$^2$ and double the range over which alongitudinal/transverse separation of the cross section can be performed. Thedifference between our results and polarization data agrees with that observedat lower Q$^2$ and attributed to hard two-photon exchange (TPE) effects,extending to 8~(GeV/c)$^2$ the range of Q$^2$ for which a discrepancy isestablished at $>$95\% confidence. We use the discrepancy to quantify the sizeof TPE contributions needed to explain the cross section at high Q$^2$.

Published
2021

31. Measurement of the Ar(e,e′p) and Ti(e,e′p) cross sections in Jefferson Lab Hall A

Author

Gu, L, Abrams, D, Ankowski, AM, Jiang, L, Aljawrneh, B, Alsalmi, S, Bane, J, Batz, A, Barcus, S, Barroso, M, Benhar, O, Bellini, V, Bericic, J, Biswas, D, Camsonne, A, Castellanos, J, Chen, J-P, Christy, ME, Craycraft, K, Cruz-Torres, R, Dai, H, Day, D, Dusa, S-C, Fuchey, E, Gautam, T, Giusti, C, Gomez, J, Gu, C, Hague, T, Hansen, J-O, Hauenstein, F, Higinbotham, DW, Hyde, C, Keppel, C, Li, S, Lindgren, R, Liu, H, Mariani, C, McClellan, RE, Meekins, D, Michaels, R, Mihovilovic, M, Murphy, M, Nguyen, D, Nycz, M, Ou, L, Pandey, B, Pandey, V, Park, K, Perera, G, Puckett, AJR, Santiesteban, SN, Širca, S, Su, T, Tang, L, Tian, Y, Ton, N, Wojtsekhowski, B, Wood, S, Ye, Z, and Zhang, J

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, nucl-ex, nucl-th, Nuclear and plasma physics
Abstract

The E12-14-012 experiment, performed in Jefferson Lab Hall A, has collected exclusive electron-scattering data (e,e′p) in parallel kinematics using natural argon and natural titanium targets. Here we report the first results of the analysis of the data set corresponding to beam energy 2222 GeV, electron scattering angle 21.5∘, and proton emission angle -50∘. The differential cross sections, measured with ≈4% uncertainty, have been studied as a function of missing energy and missing momentum, and compared to the results of Monte Carlo simulations, obtained from a model based on the distorted-wave impulse approximation.

Published
2021

32. Measurement of the cross sections for inclusive electron scattering in the E12-14-012 experiment at Jefferson Lab

Author

Murphy, M., Dai, H., Gu, L., Abrams, D., Ankowski, A. M., Aljawrneh, B., Alsalmi, S., Bane, J., Barcus, S., Benhar, O., Bellini, V., Bericic, J., Biswas, D., Camsonne, A., Castellanos, J., Chen, J. -P., Christy, M. E., Craycraft, K., Cruz-Torres, R., Day, D., Dusa, S. -C., Fuchey, E., Gautam, T., Giusti, C., Gomez, J., Gu, C., Hague, T., Hansen, J. -O., Hauenstein, F., Higinbotham, D. W., Hyde, C., Jen, C. M., Keppel, C., Li, S., Lindgren, R., Liu, H., Mariani, C., McClellan, R. E., Meekins, D., Michaels, R., Mihovilovic, M., Nguyen, D., Nycz, M., Ou, L., Pandey, B., Pandey, V., Park, K., Perera, G., Puckett, A. J. R., Santiesteban, S. N., Širca, S., Su, T., Tang, L., Tian, Y., Ton, N., Wojtsekhowski, B., Wood, S., Ye, Z., and Zhang, J.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology, Nuclear Experiment
Abstract

The E12-14-012 experiment performed at Jefferson Lab Hall A has collected inclusive electron-scattering data for different targets at the kinematics corresponding to beam energy 2.222 GeV and scattering angle 15.54 deg. Here we present a comprehensive analysis of the collected data and compare the double-differential cross sections for inclusive scattering of electrons, extracted using solid targets (aluminum, carbon, and titanium) and a closed argon-gas cell. The data extend over broad range of energy transfer, where quasielastic interaction, Delta-resonance excitation, and inelastic scattering yield contributions to the cross section. The double-differential cross sections are reported with high precision (~3%) for all targets over the covered kinematic range., Comment: 11 pages, 10 figures

Published
2019
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33. 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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34. Deep exclusive electroproduction of $π^0$ at high $Q^2$ in the quark valence regime

Author

Collaboration, The Jefferson Lab Hall A, Dlamini, M, Karki, B, Ali, SF, Lin, P-J, Georges, F, Ko, H-S, Israel, N, Rashad, MNH, Stefanko, A, Adikaram, D, Ahmed, Z, Albataineh, H, Aljawrneh, B, Allada, K, Allison, S, Alsalmi, S, Androic, D, Aniol, K, Annand, J, Atac, H, Averett, T, Gayoso, C Ayerbe, Bai, X, Bane, J, Barcus, S, Bartlett, K, Bellini, V, Beminiwattha, R, Bericic, J, Biswas, D, Brash, E, Bulumulla, D, Campbell, J, Camsonne, A, Carmignotto, M, Castellano, J, Chen, C, Chen, J-P, Chetry, T, Christy, ME, Cisbani, E, Clary, B, Cohen, E, Compton, N, Cornejo, JC, Dusa, S Covrig, Crowe, B, Danagoulian, S, Danley, T, Persio, F De, Deconinck, W, Defurne, M, Desnault, C, Di, D, Duer, M, Duran, B, Ent, R, Fanelli, C, Franklin, G, Fuchey, E, Gal, C, Gaskell, D, Gautam, T, Glamazdin, O, Gnanvo, K, Gray, VM, Gu, C, Hague, T, Hamad, G, Hamilton, D, Hamilton, K, Hansen, O, Hauenstein, F, Henry, W, Higinbotham, DW, Holmstrom, T, Horn, T, Huang, Y, Huber, GM, Hyde, C, Ibrahim, H, Jen, C-M, Jin, K, Jones, M, Kabir, A, Keppel, C, Khachatryan, V, King, PM, Li, S, Li, W, Liu, J, Liu, H, Liyanage, A, Magee, J, Malace, S, Mammei, J, Markowitz, P, McClellan, E, and Meddi, F

Subjects
hep-ex, nucl-ex
Abstract

We report measurements of the exclusive neutral pion electroproduction crosssection off protons at large values of $x_B$ (0.36, 0.48 and 0.60) and $Q^2$(3.1 to 8.4 GeV$^2$) obtained from Jefferson Lab Hall A experiment E12-06-014.The corresponding structure functions $d\sigma_L/dt+\epsilon d\sigma_T/dt$,$d\sigma_{TT}/dt$, $d\sigma_{LT}/dt$ and $d\sigma_{LT'}/dt$ are extracted as afunction of the proton momentum transfer $t-t_{min}$. The results suggest theamplitude for transversely polarized virtual photons continues to dominate thecross-section throughout this kinematic range. The data are well described bycalculations based on transversity Generalized Parton Distributions coupled toa helicity flip Distribution Amplitude of the pion, thus providing a unique wayto probe the structure of the nucleon.

Published
2020

35. 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

36. 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

37. Density Changes in Low Pressure Gas Targets for Electron Scattering Experiments

Author

Santiesteban, S. N., Alsalmi, S., Meekins, D., Bane, J., Barcus, S., Campbell, J., Castellanos, J., Cruz-Torres, R., Dai, H., Hague, T., Hauenstein, F., Higinbotham, D. W., Holt, R. J., Kutz, T., Li, S., Liu, H., McClellan, R. E., Nycz, M., Nguyen, D., Pandey, B., Pandey, V., Schmidt, A., Su, T., and Ye, Z.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

A system of modular sealed gas target cells has been developed for use in electron scattering experiments at the Thomas Jefferson National Accelerator Facility (Jefferson Lab). This system was initially developed to complete the MARATHON experiment which required, among other species, tritium as a target material. Thus far, the cells have been loaded with the gas species 3H, 3He, 2H, 1H and 40Ar and operated in nominal beam currents of up to 22.5 uA in Jefferson Lab's Hall A. While the gas density of the cells at the time of loading is known, the density of each gas varies uniquely when heated by the electron beam. To extract experimental cross sections using these cells, density dependence on beam current of each target fluid must be determined. In this study, data from measurements with several beam currents within the range of 2.5 to 22.5 uA on each target fluid are presented. Additionally, expressions for the beam current dependent fluid density of each target are developed., Comment: 8 pages, 12 figures, 4 tables

Published
2018
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38. First Measurement of the Ar$(e,e^\prime)X$ Cross Section at Jefferson Lab

Author

Dai, H., Murphy, M., Pandey, V., Abrams, D., Nguyen, D., Aljawrneh, B., Alsalmi, S., Ankowski, A. M., Bane, J., Barcus, S., Benhar, O., Bellini, V., Bericic, J., Biswas, D., Camsonne, A., Castellanos, J., Chen, J. -P., Christy, M. E., Craycraft, K., Cruz-Torres, R., Day, D., Dusa, S. -C., Fuchey, E., Gautam, T., Giusti, C., Gomez, J., Gu, C., Hague, T., Hansen, J. -O., Hauenstein, F., Higinbotham, D. W., Hyde, C., Jen, C. M., Keppel, C., Li, S., Lindgren, R., Liu, H., Mariani, C., McClellan, R. E., Meekins, D., Michaels, R., Mihovilovic, M., Nycz, M., Ou, L., Pandey, B., Park, K., Perera, G., Puckett, A. J. R., Santiesteban, S. N., Širca, S., Su, T., Tang, L., Tian, Y., Ton, N., Wojtsekhowski, B., Wood, S., Ye, Z., and Zhang, J.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, Nuclear Theory
Abstract

The success of the ambitious programs of both long- and short-baseline neutrino-oscillation experiments employing liquid-argon time-projection chambers will greatly rely on the precision with which the weak response of the argon nucleus can be estimated. In the E12-14-012 experiment at Jefferson Lab Hall A, we have studied the properties of the argon nucleus by scattering a high-quality electron beam off a high-pressure gaseous argon target. Here, we present the measured $^{40}$Ar$(e,e^{\prime})$ double differential cross section at incident electron energy $E=2.222$~GeV and scattering angle $\theta = 15.541^\circ$. The data cover a broad range of energy transfers, where quasielastic scattering and delta production are the dominant reaction mechanisms. The result for argon is compared to our previously reported cross sections for titanium and carbon, obtained in the same kinematical setup., Comment: 6 pages, 4 figures

Published
2018
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39. First Measurement of the Ti$(e,e^\prime){\rm X}$ Cross Section at Jefferson Lab

Author

Dai, H., Murphy, M., Pandey, V., Abrams, D., Nguyen, D., Aljawrneh, B., Alsalmi, S., Ankowski, A. M., Bane, J., Barcus, S., Benhar, O., Bellini, V., Bericic, J., Biswas, D., Camsonne, A., Castellanos, J., Chen, J. -P., Christy, M. E., Craycraft, K., Cruz-Torres, R., Day, D., Dusa, S. -C., Fuchey, E., Gautam, T., Giusti, C., Gomez, J., Gu, C., Hague, T., Hansen, J. -O., Hauenstein, F., Higinbotham, D. W., Hyde, C., Jen, C. M., Keppel, C., Li, S., Lindgren, R., Liu, H., Mariani, C., McClellan, R. E., Meekins, D., Michaels, R., Mihovilovic, M., Nycz, M., Ou, L., Pandey, B., Park, K., Perera, G., Puckett, A. J. R., Širca, S., Su, T., Tang, L., Tian, Y., Ton, N., Wojtsekhowski, B., Wood, S., Ye, Z., and Zhang, J.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, Nuclear Theory
Abstract

To probe CP violation in the leptonic sector using GeV energy neutrino beams in current and future experiments using argon detectors, precise models of the complex underlying neutrino and antineutrino interactions are needed. The E12-14-012 experiment at Jefferson Lab Hall A was designed to perform a combined analysis of inclusive and exclusive electron scatterings on both argon ($N = 22$) and titanium ($Z = 22$) nuclei using GeV energy electron beams. The measurement on titanium nucleus provides essential information to understand the neutrino scattering on argon, large contribution to which comes from scattering off neutrons. Here we report the first experimental study of electron-titanium scattering as double differential cross section at beam energy $E=2.222$ GeV and electron scattering angle $\theta = 15.541$ deg, measured over a broad range of energy transfer, spanning the kinematical regions in which quasielastic scattering and delta production are the dominant reaction mechanisms. The data provide valuable new information needed to develop accurate theoretical models of the electromagnetic and weak cross sections of these complex nuclei in the kinematic regime of interest to neutrino experiments., Comment: 6 pages, 5 figures. Version published in Physical Review C

Published
2018
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40. Measurement of the cross sections for inclusive electron scattering in the E12-14-012 experiment at Jefferson Lab

Author

Murphy, M, Dai, H, Gu, L, Abrams, D, Ankowski, AM, Aljawrneh, B, Alsalmi, S, Bane, J, Barcus, S, Benhar, O, Bellini, V, Bericic, J, Biswas, D, Camsonne, A, Castellanos, J, Chen, J-P, Christy, ME, Craycraft, K, Cruz-Torres, R, Day, D, Dusa, S-C, Fuchey, E, Gautam, T, Giusti, C, Gomez, J, Gu, C, Hague, T, Hansen, J-O, Hauenstein, F, Higinbotham, DW, Hyde, C, Jen, CM, Keppel, C, Li, S, Lindgren, R, Liu, H, Mariani, C, McClellan, RE, Meekins, D, Michaels, R, Mihovilovic, M, Nguyen, D, Nycz, M, Ou, L, Pandey, B, Pandey, V, Park, K, Perera, G, Puckett, AJR, Santiesteban, SN, Širca, S, Su, T, Tang, L, Tian, Y, Ton, N, Wojtsekhowski, B, Wood, S, Ye, Z, and Zhang, J

Subjects
hep-ex, hep-ph, nucl-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

The E12-14-012 experiment performed at Jefferson Lab Hall A has collected inclusive electron-scattering data for different targets at the kinematics corresponding to beam energy 2.222 GeV and scattering angle 15.54. Here we present a comprehensive analysis of the collected data and compare the double-differential cross sections for inclusive scattering of electrons, extracted using solid targets (aluminum, carbon, and titanium) and a closed argon-gas cell. The data extend over broad range of energy transfer, where quasielastic interaction, Δ-resonance excitation, and inelastic scattering yield contributions to the cross section. The double-differential cross sections are reported with high precision (∼3%) for all targets over the covered kinematic range.

Published
2019

41. 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

42. Density changes in low pressure gas targets for electron scattering experiments

Author

Santiesteban, SN, Alsalmi, S, Meekins, D, Gayoso, C Ayerbe, Bane, J, Barcus, S, Campbell, J, Castellanos, J, Cruz-Torres, R, Dai, H, Hague, T, Hauenstein, F, Higinbotham, DW, Holt, RJ, Kutz, T, Li, S, Liu, H, McClellan, RE, Nycz, M, Nguyen, D, Pandey, B, Pandey, V, Schmidt, A, Su, T, and Ye, Z

Subjects
Target, Tritium, Helium, Deuterium, Hydrogen, Argon, physics.ins-det, nucl-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences, Nuclear & Particles Physics
Abstract

A system of modular sealed gas target cells has been developed for use in electron scattering experiments at the Thomas Jefferson National Accelerator Facility (Jefferson Lab). This system was initially developed to complete the MARATHON experiment which required, among other species, tritium as a target material. Thus far, the cells have been loaded with the gas species 3H, 3He, 2H, 1H and 40Ar and operated in nominal beam currents of up to 22.5 μA in Jefferson Lab's Hall A. While the gas density of the cells at the time of loading is known, the density of each gas varies uniquely when heated by the electron beam. To extract experimental cross sections using these cells, density dependence on beam current of each target fluid must be determined. In this study, data from measurements with several beam currents within the range of 2.5 to 22.5 μA on each target fluid are presented. Additionally, expressions for the beam current dependent fluid density of each target are developed.

Published
2019

43. 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

44. First measurement of the Ar(e,e′)X cross section at Jefferson Laboratory

Author

Dai, H, Murphy, M, Pandey, V, Abrams, D, Nguyen, D, Aljawrneh, B, Alsalmi, S, Ankowski, AM, Bane, J, Barcus, S, Benhar, O, Bellini, V, Bericic, J, Biswas, D, Camsonne, A, Castellanos, J, Chen, J-P, Christy, ME, Craycraft, K, Cruz-Torres, R, Day, D, Dusa, S-C, Fuchey, E, Gautam, T, Giusti, C, Gomez, J, Gu, C, Hague, T, Hansen, J-O, Hauenstein, F, Higinbotham, DW, Hyde, C, Jen, CM, Keppel, C, Li, S, Lindgren, R, Liu, H, Mariani, C, McClellan, RE, Meekins, D, Michaels, R, Mihovilovic, M, Nycz, M, Ou, L, Pandey, B, Park, K, Perera, G, Puckett, AJR, Santiesteban, SN, Širca, S, Su, T, Tang, L, Tian, Y, Ton, N, Wojtsekhowski, B, Wood, S, Ye, Z, and Zhang, J

Subjects
nucl-ex, hep-ex, nucl-th, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

The success of the ambitious programs of both long- and short-baseline neutrino-oscillation experiments employing liquid-argon time-projection chambers will greatly rely on the precision with which the weak response of the argon nucleus can be estimated. In the E12-14-012 experiment at Jefferson Lab Hall A, we studied the properties of the argon nucleus by scattering a high-quality electron beam off a high-pressure gaseous argon target. Here, we present the measured Ar40(e,e′) double differential cross section at incident electron energy E=2.222 GeV and scattering angle θ=15.54â. The data cover a broad range of energy transfers, where quasielastic scattering and delta production are the dominant reaction mechanisms. The result for argon is compared to our previously reported cross sections for titanium and carbon, obtained in the same kinematical setup.

Published
2019

45. First measurement of the Ti(e,e′)X cross section at Jefferson Lab

Author

Dai, H, Murphy, M, Pandey, V, Abrams, D, Nguyen, D, Aljawrneh, B, Alsalmi, S, Ankowski, AM, Bane, J, Barcus, S, Benhar, O, Bellini, V, Bericic, J, Biswas, D, Camsonne, A, Castellanos, J, Chen, J-P, Christy, ME, Craycraft, K, Cruz-Torres, R, Day, D, Dusa, S-C, Fuchey, E, Gautam, T, Giusti, C, Gomez, J, Gu, C, Hague, T, Hansen, J-O, Hauenstein, F, Higinbotham, DW, Hyde, C, Jen, CM, Keppel, C, Li, S, Lindgren, R, Liu, H, Mariani, C, McClellan, RE, Meekins, D, Michaels, R, Mihovilovic, M, Nycz, M, Ou, L, Pandey, B, Park, K, Perera, G, Puckett, AJR, Širca, S, Su, T, Tang, L, Tian, Y, Ton, N, Wojtsekhowski, B, Wood, S, Ye, Z, and Zhang, J

Subjects
nucl-ex, hep-ex, nucl-th, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

To probe CP violation in the leptonic sector using GeV energy neutrino beams in current and future experiments using argon detectors, precise models of the complex underlying neutrino and antineutrino interactions are needed. The E12-14-012 experiment at Jefferson Lab Hall A was designed to perform a combined analysis of inclusive and exclusive electron scatterings on both argon (N=22) and titanium (Z=22) nuclei using GeV-energy electron beams. The measurement on titanium nucleus provides essential information to understand the neutrino scattering on argon, large contribution to which comes from scattering off neutrons. Here we report the first experimental study of electron-titanium scattering as double-differential cross section at beam energy E=2.222 GeV and electron-scattering angle θ=15.541, measured over a broad range of energy transfer, spanning the kinematical regions in which quasielastic scattering and delta production are the dominant reaction mechanisms. The data provide valuable new information needed to develop accurate theoretical models of the electromagnetic and weak cross sections of these complex nuclei in the kinematic regime of interest to neutrino experiments.

Published
2018

46. Cross-section measurement of virtual photoproduction of iso-triplet three-body hypernucleus, Λnn

Author

Gogami T., Suzuki K. N., Pandey B., Itabashi K., Nagao S., Okuyama K., Nakamura S. N., Tang L., Abrams D., Akiyama T., Androic D., Aniol K., Ayerbe Gayoso C., Bane J., Barcus S., Barrow J., Bellini V., Bhatt H., Bhetuwal D., Biswas D., Camsonne A., Castellanos J., Chen J-P., Chen J., Covrig S., Chrisman D., Cruz-Torres R., Das R., Fuchey E., Gnanvo K., Garibaldi F., Gautam T., Gomez J., Gueye P., Hague T. J., Hansen O., Henry W., Hauenstein F., Higinbotham D. W., Hyde C. E., Kaneta M., Keppel C., Kutz T., Lashley-Colthirst N., Li S., Liu H., Mammei J., Markowitz P., McClellan R. E., Meddi F., Meekins D., Michaels R., Mihovilovic M., Moyer A., Nguyen D., Nycz M., Owen V., Palatchi C., Park S., Petkovic T., Premathilake S., Reimer P. E., Reinhold J., Riordan S., Rodriguez V., Samanta C., Santiesteban S. N., Sawatzky B., Širca S., Slifer K., Su T., Tian Y., Toyama Y., Uehara K., Urciuoli G. M., Votaw D., Williamson J., Wojtsekhowski B., Wood S. A., Yale B., Ye Z., Zhang J., and Zheng X.

Subjects
Physics, QC1-999
Abstract

Missing-mass spectroscopy with the 3H(e, e′K+) reaction was carried out at Jefferson Lab’s (JLab) Hall A in Oct–Nov, 2018. The differential cross section for the 3H(γ∗, K+)Λnn was deduced at ω = Ee − Ee′ = 2.102 GeV and at the forward K+-scattering angle (0° ≤ θγ∗K ≤ 5°) in the laboratory frame. Given typical predicted energies and decay widths, which are (BΛ, Γ) = (−0.25, 0.8) and (−0.55, 4.7) MeV, the cross sections were found to be 11.2 ± 4.8(stat.)+4.1−2.1(sys.) and 18.1 ± 6.8(stat.)+4.2−2.9(sys.) nb/sr, respectively. The obtained result would impose a constraint for interaction models particularly between Λ and neutron by comparing to theoretical calculations.

Published
2022
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47. Study of the Λ/Σ0 electroproduction in the low-Q2 region at JLab

Author

Okuyama K., Itabashi K., Nagao S., Nakamura S. N., Suzuki K. N., Gogami T., Pandey B., Tang L., Abrams D., Akiyama T., Androic D., Aniol K., Ayerbe Gayoso C., Bane J., Barcus S., Barrow J., Bellini V., Bhatt H., Bhetuwal D., Biswas D., Camsonne A., Castellanos J., Chen J-P., Chen J., Covrig S., Chrisman D., Cruz-Torres R., Das R., Fuchey E., Gnanvo K., Garibaldi F., Gautam T., Gomez J., Gueye P., Hague T. J., Hansen O., Henry W., Hauenstein F., Higinbotham D. W., Hyde C. E., Kaneta M., Keppel C., Kutz T., Lashley-Colthirst N., Li S., Liu H., Mammei J., Markowitz P., McClellan R. E., Meddi F., Meekins D., Michaels R., Mihovilovic M., Moyer A., Nguyen D., Nycz M., Owen V., Palatchi C., Park S., Petkovic T., Premathilake S., Reimer P. E., Reinhold J., Riordan S., Rodriguez V., Samanta C., Santiesteban S. N., Sawatzky B., Širca S., Slifer K., Su T., Tian Y., Toyama Y., Uehara K., Urciuoli G. M., Votaw D., Williamson J., Wojtsekhowski B., Wood S. A., Yale B., Ye Z., Zhang J., and Zheng X.

Subjects
Physics, QC1-999
Abstract

We performed an experiment using tritium and hydrogen cryogenic gas targets at Thomas Jefferson National Accelerator Facility (JLab) in 2018 (E12-17-003)[1, 2]. In this article, we discuss the Λ/Σ0 hyperon electroproduction from hydrogen target. Elementary Λ/Σ0 hyperon production processes are important not only for an absolute mass scale calibration in our experiment, but also for the study of the electroproduction mechanisms themselves. In this article, we reported the results of the differential cross section for the p(e, e’K+)Λ/Σ0 reaction at Q2 ∼ 0.5 (GeV/c)2.

Published
2022
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48. Study of Λn FSI with Λ quasi-free productions on the 3H(e, e′K+)X reaction at JLab

Author

Itabashi K., Suzuki K.N., Pandey B., Okuyama K., Gogami T., Nagao S., Nakamura S.N., Tang L., Abrams D., Akiyama T., Androic D., Aniol K., Ayerbe Gayoso C., Bane J., Barcus S., Barrow J., Bellini V., Bhatt H., Bhetuwal D., Biswas D., Camsonne A., Castellanos J., Chen J-P., Chen J., Covrig S., Chrisman D., Cruz-Torres R., Das R., Fuchey E., Gnanvo K., Garibaldi F., Gautam T., Gomez J., Gueye P., Hague T.J., Hansen O., Henry W., Hauenstein F., Higinbotham D.W., Hyde C.E., Kaneta M., Keppel C., Kutz T., Lashley-Colthirst N., Li S., Liu H., Mammei J., Markowitz P., McClellan R. E., Meddi F., Meekins D., Michaels R., Mihovilovic M., Moyer A., Nguyen D., Nycz M., Owen V., Palatchi C., Park S., Petkovic T., Premathilake S., Reimer P.E., Reinhold J., Riordan S., Rodriguez V., Samanta C., Santiesteban S.N., Sawatzky B., Širca S., Slifer K., Su T., Tian Y., Toyama Y., Uehara K., Urciuoli G.M., Votaw D., Williamson J., Wojtsekhowski B., Wood S.A., Yale B., Ye Z., Zhang J., and Zheng X.

Subjects
Physics, QC1-999
Abstract

Abstract. An nnΛ is a neutral baryon system with no charge. The study of the pure Λ-neutron system such as nnΛ gives us information on the Λn interaction. The nnΛ search experiment (E12-17-003) was performed at JLab Hall A in 2018. In this article, the Λn FSI was investigated by a shape analysis of the 3H(e, e′K+)X missing mass spectrum, and a preliminary result for the Λn FSI study is given.

Published
2022
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49. Measurement of the Nucleon <math><msubsup><mi>F</mi><mn>2</mn><mi>n</mi></msubsup><mo>/</mo><msubsup><mi>F</mi><mn>2</mn><mi>p</mi></msubsup></math> Structure Function Ratio by the Jefferson Lab MARATHON Tritium/Helium-3 Deep Inelastic Scattering Experiment

Author

Abrams, D., Albataineh, H., Aljawrneh, B. S., 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, 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., Salmè, G., Santiesteban, N., Sawatzky, B., Scopetta, S., Schmidt, A., Schmookler, B., Segal, J., Segarra, E. P., Shahinyan, A., Širca, 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.

Abstract

The ratio of the nucleon F2 structure functions, F2n/F2p, is determined by the MARATHON experiment from measurements of deep inelastic scattering of electrons from H3 and He3 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

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Author

20750368, Suzuki, K N, Gogami, T, Pandey, B, Itabashi, K, Nagao, S, Okuyama, K, Nakamura, S N, Tang, L, Abrams, D, Akiyama, T, Androic, D, Aniol, K, Gayoso, C Ayerbe, Bane, J, Barcus, S, Barrow, J, Bellini, V, Bhatt, H, Bhetuwal, D, Biswas, D, Camsonne, A, Castellanos, J, Chen, J-P, Chen, J, Covrig, S, Chrisman, D, Cruz-Torres, R, Das, R, Fuchey, E, Gnanvo, K, Garibaldi, F, Gautam, T, Gomez, J, Gueye, P, Hague, T J, Hansen, O, Henry, W, Hauenstein, F, Higinbotham, D W, Hyde, C E, Kaneta, M, Keppel, C, Kutz, T, Lashley-Colthirst, N, Li, S, Liu, H, Mammei, J, Markowitz, P, McClellan, R E, Meddi, F, Meekins, D, Michaels, R, Mihovilovič, M, Moyer, A, Nguyen, D, Nycz, M, Owen, V, Palatchi, C, Park, S, Petkovic, T, Premathilake, S, Reimer, P E, Reinhold, J, Riordan, S, Rodriguez, V, Samanta, C, Santiesteban, S N, Sawatzky, B, Širca, S, Slifer, K, Su, T, Tian, Y, Toyama, Y, Uehara, K, Urciuoli, G M, Votaw, D, Williamson, J, Wojtsekhowski, B, Wood, S A, Yale, B, Ye, Z, Zhang, J, Zheng, X, 20750368, Suzuki, K N, Gogami, T, Pandey, B, Itabashi, K, Nagao, S, Okuyama, K, Nakamura, S N, Tang, L, Abrams, D, Akiyama, T, Androic, D, Aniol, K, Gayoso, C Ayerbe, Bane, J, Barcus, S, Barrow, J, Bellini, V, Bhatt, H, Bhetuwal, D, Biswas, D, Camsonne, A, Castellanos, J, Chen, J-P, Chen, J, Covrig, S, Chrisman, D, Cruz-Torres, R, Das, R, Fuchey, E, Gnanvo, K, Garibaldi, F, Gautam, T, Gomez, J, Gueye, P, Hague, T J, Hansen, O, Henry, W, Hauenstein, F, Higinbotham, D W, Hyde, C E, Kaneta, M, Keppel, C, Kutz, T, Lashley-Colthirst, N, Li, S, Liu, H, Mammei, J, Markowitz, P, McClellan, R E, Meddi, F, Meekins, D, Michaels, R, Mihovilovič, M, Moyer, A, Nguyen, D, Nycz, M, Owen, V, Palatchi, C, Park, S, Petkovic, T, Premathilake, S, Reimer, P E, Reinhold, J, Riordan, S, Rodriguez, V, Samanta, C, Santiesteban, S N, Sawatzky, B, Širca, S, Slifer, K, Su, T, Tian, Y, Toyama, Y, Uehara, K, Urciuoli, G M, Votaw, D, Williamson, J, Wojtsekhowski, B, Wood, S A, Yale, B, Ye, Z, Zhang, J, and Zheng, X

Published
2022

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