Search

Your search keyword '"SOTO, O."' showing total 15 results
Start Over Author "SOTO, O." Topic settore fis/04
15 results on '"SOTO, O."'

1. Beam-spin asymmetry sigma for sigma- hyperon photoproduction off the neutron

Author

Zachariou, N, Munevar, E, Berman, Bl, Byd??ovsk??, P, Ciepl??, A, Feldman, G, Ilieva, Y, Nadel-Turonski, P, Skoupil, D, Sarantsev, Av, Watts, Dp, Amaryan, Mj, Angelini, G, Armstrong, Wr, Atac, H, Avakian, H, Barion, L, Bashkanov, M, Battaglieri, M, Bedlinskiy, I, Benmokhtar, F, Bianconi, A, Biondo, L, Biselli, As, Bondi, M, Boss??, F, Boiarinov, S, Briscoe, Wj, Brooks, Wk, Bulumulla, D, Burkert, Vd, Carman, Ds, Carvajal, Jc, Celentano, A, Chatagnon, P, Chetry, T, Ciullo, G, Clark, L, Cole, Pl, Contalbrigo, M, Costantini, G, Crede, V, D'Angelo, A, Dashyan, N, De Vita, R, Defurne, M, Deur, A, Diehl, S, Djalali, C, Dupre, R, Dugger, M, Egiyan, H, Ehrhart, M, El Alaoui, A, El Fassi, L, Eugenio, P, Fedotov, G, Fegan, S, Filippi, A, Fradi, A, Gavalian, G, Gilfoyle, Gp, Girod, Fx, Gleason, C, Golubenko, Aa, Gothe, Rw, Griffioen, Ka, Guidal, M, Hafidi, K, Hakobyan, H, Hattawy, M, Hayward, Tb, Heddle, D, Hicks, K, Hobart, A, Holtrop, M, Ireland, Dg, Isupov, El, Jenkins, D, H. S., J, Joo, K, Keller, D, Khanal, A, Khandaker, M, Kim, A, Klein, Fj, Kripko, A, Kubarovsky, V, Lanza, L, Leali, M, Livingston, K, Macgregor, Ijd, Marchand, D, Markov, N, Marsicano, L, Mascagna, V, Mckinnon, B, Migliorati, S, Mineeva, T, Mirazita, M, Mokeev, V, Munoz Camacho, C, Neupane, K, Niccolai, S, Niculescu, G, O'Connell, Tr, Osipenko, M, Ostrovidov, Ai, Pandey, P, Paolone, M, Pappalardo, Ll, Paremuzyan, R, Pasyuk, E, Phelps, W, Pogorelko, O, Price, Jw, Prok, Y, Raue, Ba, Ripani, M, Ritman, J, Rizzo, A, Rosner, G, Rowley, J, Sabatie, F, Salgado, C, Schmidt, A, Schumacher, Ra, Sharabian, Yg, Shirokov, Ev, Shrestha, U, Sokhan, D, Soto, O, Sparveris, N, Stepanyan, S, Stoler, P, Strakovsky, Ii, Strauch, S, Tyson, R, Ungaro, M, Venturelli, L, Voskanyan, H, Vossen, A, Voutier, E, Wei, K, Wei, X, Wishart, R, Wood, Mh, Yale, B, Zhang, J, and Zhao, Zw

Subjects
Settore FIS/04
Published
2022

2. Multidimensional, High Precision Measurements of Beam Single Spin Asymmetries in Semi-inclusive π + Electroproduction off Protons in the Valence Region

Author

Diehl, S, Kim, A, Angelini, G, Joo, K, Adhikari, S, Amaryan, M, Arratia, M, Atac, H, Avakian, H, Ayerbe Gayoso, C, Baltzell, N A, Barion, L, Bastami, S, Battaglieri, M, Bedlinskiy, I, Benmokhtar, F, Bianconi, A, Biselli, A S, Bondi, M, Bossù, F, Boiarinov, S, Brinkmann, K-T, Briscoe, W J, Brooks, W, Bulumulla, D, Burkert, V D, Carman, D S, Carvajal, J C, Celentano, A, Chatagnon, P, Chetry, T, Ciullo, G, Clark, L, Clary, B A, Cole, P L, Contalbrigo, M, Costantini, G, Crede, V, D'Angelo, A, Dashyan, N, De Vita, R, Defurne, M, Deur, A, Dilks, C, Djalali, C, Dugger, M, Dupre, R, Egiyan, H, Ehrhart, M, El Alaoui, A, El Fassi, L, Elouadrhiri, L, Fegan, S, Filippi, A, Forest, T, Gavalian, G, Gilfoyle, G P, Girod, F X, Glazier, D I, Golubenko, A A, Gothe, R W, Gotra, Y, Griffioen, K A, Guidal, M, Hafidi, K, Hakobyan, H, Hattawy, M, Hauenstein, F, Hayward, T B, Heddle, D, Hicks, K, Hobart, A, Holtrop, M, Hyde, C E, Ireland, D G, Isupov, E L, Jo, H S, Johnston, R, Joosten, S, Keller, D, Khachatryan, M, Khanal, A, Kim, W, Kripko, A, Kubarovsky, V, Kuhn, S E, Lanza, L, Leali, M, Lee, S, Lenisa, P, Livingston, K, Lu, Z, MacGregor, I J D, Marchand, D, Markov, N, Marsicano, L, Mascagna, V, McKinnon, B, Meziani, Z E, Milner, R G, Mineeva, T, Mirazita, M, Mokeev, V, Moran, P, Movsisyan, A, Munoz Camacho, C, Nadel-Turonski, P, Naidoo, Paul, Nanda, S, Neupane, K, Niccolai, S, Niculescu, G, O'Connell, T R, Osipenko, M, Paolone, M, Pappalardo, L L, Paremuzyan, R, Pasyuk, E, Phelps, W, Pogorelko, O, Prok, Y, Prokudin, A, Raue, B A, Ripani, M, Ritman, J, Rizzo, A, Roberts, C D, Rossi, P, Rowley, J, Sabatié, F, Salgado, C, Schmidt, A, Segarra, E P, Sharabian, Y G, Shrestha, U, Simmerling, P, Sokhan, D, Soto, O, Sparveris, N, Stepanyan, S, Stoler, P, Strakovsky, I I, Strauch, S, Tezgin, K, Thornton, A., Tyler, N, Tyson, R, Ungaro, M, Venturelli, L, Voskanyan, H, Vossen, A, Voutier, E, Watts, D P, Wei, K, Wei, X, Xu, S-S, Yale, B, Zachariou, N, Zhang, J, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and CLAS

Subjects
deep inelastic scattering: semi-inclusive reaction, precision measurement, Settore FIS/04, nucleon, pi+: electroproduction, parton: distribution function, structure function: ratio, polarized beam, quark gluon: correlation, transverse momentum dependence, High Energy Physics - Experiment, kinematics, CLAS, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], twist: 3, ddc:530, High Energy Physics::Experiment, electron: beam, higher-dimensional, Nuclear Experiment, spin: asymmetry, experimental results, Jefferson Lab
Abstract

Physical review letters 128(6), 062005 (2022). doi:10.1103/PhysRevLett.128.062005, High precision measurements of the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering (SIDIS) from the proton have been performed using a 10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. We report here a high precision multidimensional study of single π+ SIDIS data over a large kinematic range in Bjorken x, fractional energy, and transverse momentum of the hadron as well as photon virtualities Q2 ranging from 1–7 GeV2. In particular, the structure function ratio FsinϕLU/FUU has been determined, where FsinϕLU is a twist-3 quantity that can reveal novel aspects of emergent hadron mass and quark-gluon correlations within the nucleon. The data’s impact on the evolving understanding of the underlying reaction mechanisms and their kinematic variation is explored using theoretical models for the different contributing transverse momentum dependent parton distribution functions., Published by APS, College Park, Md.

Published
2022
Full Text
View/download PDF

3. First measurement of timelike Compton scattering

Author

Chatagnon, P., Niccolai, S., Stepanyan, S., Amaryan, M. J., Angelini, G., Armstrong, W. R., Atac, H., Gayoso, C. Ayerbe, Baltzell, N. A., Barion, L., Bashkanov, M., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biondo, L., Biselli, A. S., Bondi, M., Bossù, F., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Bulumulla, D., Burkert, V. D., Carman, D. S., Carvajal, J. C., Caudron, M., Celentano, A., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Costantini, G., Crede, V., D'Angelo, A., Dashyan, N., Defurne, M., De Vita, R., Deur, A., Diehl, S., Djalali, C., Dupré, R., Egiyan, H., Ehrhart, M., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Fegan, S., Fersch, R., Filippi, A., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Glazier, D. I., Golubenko, A. A., Gothe, R. W., Gotra, Y., Griffioen, K. A., Guidal, M., Guo, L., Hakobyan, H., Hattawy, M., Hayward, T. B., Heddle, D., Hobart, A., Holtrop, M., Hyde, C. E., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jo, H. S., Joo, K., Kabir, M. L., Keller, D., Khachatryan, G., Khanal, A., Kim, A., Kim, W., Kripko, A., Kubarovsky, V., Kuhn, S. E., Lanza, L., Leali, M., Lee, S., Lenisa, P., Livingston, K., MacGregor, I . J . D., Marchand, D., Marsicano, L., Mascagna, V., Mckinnon, B., McLauchlin, C., Migliorati, S., Mirazita, M., Mokeev, V., Montgomery, R. A., Camacho, C. Munoz, Nadel-Turonski, P., Naidoo, P., Neupane, K., O'Connell, T. R., Osipenko, M., Ouillon, M., Pandey, P., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Phelps, W., Pogorelko, O., Poudel, J., Price, J. W., Prok, Y., Raue, B. A., Reed, T., Ripani, M., Rizzo, A., Rossi, P., Rowley, J., Sabatié, F., Schmidt, A., Segarra, E. P., Sharabian, Y. G., Shirokov, E. V., Shrestha, U., Sokhan, D., Soto, O., Sparveris, N., Strakovsky, I. I., Strauch, S., Tyler, N., Tyson, R., Ungaro, M., Vallarino, S., Venturelli, L., Voskanyan, H., Vossen, A., Voutier, E., Watts, D. P., Wei, K., Wei, X., Wishart, R., Yale, B., Zachariou, N., Zhang, J., Zhao, Z. W., Collaboration, the CLAS, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Istituto Nazionale di Fisica Nucleare, Sezione di Genova (INFN, Sezione di Genova), and Istituto Nazionale di Fisica Nucleare (INFN)

Subjects
gpds, electroproduction, pressure, proton, Physics, Astrophysics::High Energy Astrophysical Phenomena, Socio-culturale, General Physics and Astronomy, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, General Relativity and Quantum Cosmology, High Energy Physics - Experiment (hep-ex), Economica, PE2_2, PE2_1, 0103 physical sciences, 010306 general physics, Nuclear Experiment, PE2_3, [PHYS]Physics [physics], Parton Distribution Functions, 010308 nuclear & particles physics, Settore FIS/04, Quark model of nucleons, QCD, Compton Scattering, High Energy Physics::Experiment
Abstract

We present the first measurement of the timelike Compton scattering process, γp→p′γ*(γ*→e+e−), obtained with the CLAS12 detector at Jefferson Lab. The photon beam polarization and the decay lepton angular asymmetries are reported in the range of timelike photon virtualities 2.25

Published
2021

4. Electron-beam energy reconstruction for neutrino oscillation measurements

Author

Khachatryan, M., Papadopoulou, A., Ashkenazi, A., Hauenstein, F., Nambrath, A., Hrnjic, A., Weinstein, L. B., Hen, O., Piasetzky, E., Betancourt, M., Dytman, S., Mahn, K., Coloma, P., Adhikari, S., Amaryan, M. J., Angelini, Giovanni, Atac, H., Barion, L., Battaglieri, M., Bedlinskiy, I., Beck, A., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bossu, F., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Bulumulla, D., Burkert, V. D., Carman, D. S., Carvajal, J. C., Celentano, A., Chatagnon, P., Chesnokov, V., Chetry, T., Ciullo, G., Clark, Louise, Clary, B. A., Cohen, E. O., Cole, P. L., Contalbrigo, M., Crede, V., Cruz-Torres, R., D’Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Denniston, A., Deur, A., Diehl, S., Djalali, C., Duer, M., Dupre, R., Egiyan, H., Ehrhart, M., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fersch, R., Filippi, A., Forest, T. A., Gavalian, G., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Glazier, D. I., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hakobyan, H., Hattawy, M., Hayward, T. B., Heddle, D., Hicks, K., Hobart, A., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Joo, K., Keller, D., Khanal, A., Khandaker, M., Kim, C. W., Kim, W., Korover, I., Kubarovsky, V., Kuhn, S. E., Lanza, L., Leali, M., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Markov, N., Marsicano, L., Mascagna, V., McKinnon, B., May-Tal Beck, S., Mineeva, T., Mirazita, M., Mokeev, V., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Neupane, K., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Park, K., Pasyuk, E., Pogorelko, O., Poudel, J., Prok, Y., Protopopescu, D., Pybus, J., Ripani, M., Raue, B., Ritman, J., Rizzo, A., Rosner, G., Rossi, P., Sabati, F., Salgado, C., Schmidt, A., Schumacher, R. A., Segarra, E. P., Sharabian, Y. G., Shrestha, U., Skorodumina, Iu., Sokhan, D., Soto, O., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Tyler, N., Tyson, R., Ungaro, M., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., Zhao, Z. W., Dolan, S., Megias, G. D., Gardiner, S., and Old Dominion University [Norfolk] (ODU)

Subjects
Standard Model, media_common.quotation_subject, Socio-culturale, neutrino-nucleus interactions, 01 natural sciences, 7. Clean energy, Neutrino Oscillations, Pion, Economica, PE2_2, PE2_1, 0103 physical sciences, 010306 general physics, Neutrino oscillation, PE2_4, ComputingMilieux_MISCELLANEOUS, media_common, Physics, [PHYS]Physics [physics], Multidisciplinary, Muon, 010308 nuclear & particles physics, Oscillation, Settore FIS/04, Ambientale, Universe, Computational physics, electron scattering, Neutrino, Beam (structure)
Abstract

Neutrinos exist in one of three types or ‘flavours’—electron, muon and tau neutrinos—and oscillate from one flavour to another when propagating through space. This phenomena is one of the few that cannot be described using the standard model of particle physics (reviewed in ref. 1), and so its experimental study can provide new insight into the nature of our Universe (reviewed in ref. 2). Neutrinos oscillate as a function of their propagation distance (L) divided by their energy (E). Therefore, experiments extract oscillation parameters by measuring their energy distribution at different locations. As accelerator-based oscillation experiments cannot directly measure E, the interpretation of these experiments relies heavily on phenomenological models of neutrino–nucleus interactions to infer E. Here we exploit the similarity of electron–nucleus and neutrino–nucleus interactions, and use electron scattering data with known beam energies to test energy reconstruction methods and interaction models. We find that even in simple interactions where no pions are detected, only a small fraction of events reconstruct to the correct incident energy. More importantly, widely used interaction models reproduce the reconstructed energy distribution only qualitatively and the quality of the reproduction varies strongly with beam energy. This shows both the need and the pathway to improve current models to meet the requirements of next-generation, high-precision experiments such as Hyper-Kamiokande (Japan)3 and DUNE (USA)4. Electron scattering measurements are shown to reproduce only qualitatively state-of-the-art lepton–nucleus energy reconstruction models, indicating that improvements to these particle-interaction models are required to ensure the accuracy of future high-precision neutrino oscillation experiments.

Published
2021
Full Text
View/download PDF

5. Improved Λp Elastic Scattering Cross Sections between 0.9 and 2.0 GeV/c as a Main Ingredient of the Neutron Star Equation of State

Author

Rowley, J., Compton, N., Djalali, C., Hicks, K., Price, J., Zachariou, N., Adhikari, K. P., Armstrong, W. R., Atac, H., Baashen, L., Barion, L., Bashkanov, M., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biondo, L., Biselli, A. S., Bondi, M., Bossù, F., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Bulumulla, D., Burkert, V. D., Carman, D. S., Carvajal, J. C., Celentano, A., Chatagnon, P., Chesnokov, V., Chetry, T., Ciullo, G., Clark, Louise, Cole, P. L., Contalbrigo, M., Costantini, G., Crede, V., D’Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Diehl, S., Dupré, R., Egiyan, H., Ehrhart, M., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Fegan, S., Fersch, R., Filippi, A., Fradi, A., Gavalian, G., Girod, F. X., Glazier, Derek I., Golubenko, A., Gothe, R. W., Griffioen, K., Guo, L., Hafidi, K., Hakobyan, H., Hattawy, M., Hayward, T. B., Heddle, D., Hobart, A., Holtrop, M., Ilieva, Y., Ireland, David G., Isupov, E. L., Jenkins, D., Jo, H. S., Joo, K., Keller, D., Khanal, A., Khandaker, M., Kim, A., Korover, I., Kripko, A., Kubarovsky, V., Kuhn, S. E., Lanza, L., Leali, M., Lenisa, P., Livingston, Kenneth, MacGregor, I. J. Douglas, Marchand, D., Markov, N., Marsicano, L., Mascagna, V., McCracken, M. E., McKinnon, Bryan, McLauchlin, C., Meziani, Z. E., Migliorati, S., Mineeva, T., Mirazita, M., Mokeev, V., Munevar, E., Munoz Camacho, C., Nadel-Turonski, P., Neupane, K., Niccolai, S., Niculescu, G., O’Connell, T. R., Osipenko, M., Ostrovidov, A. I., Pandey, P., Paolone, M., Pappalardo, L. L., Pasyuk, E., Pogorelko, O., Prok, Y., Reed, T., Ripani, M., Ritman, J., Rizzo, A., Rosner, Guenther, Sabatie, F., Salgado, C., Schmidt, A., Schumacher, R. A., Sharabian, Y. G., Shrestha, U., Sokhan, Daria, Soto, O., Sparveris, N., Strakovsky, I. I., Strauch, S., Tyson, Richard, Ungaro, M., Venturelli, L., Voskanyan, H., Vossen, A., Voutier, E., Watts, D. P., Wei, K., Wei, X., Wishart, Robert, Wood, M. H., Yale, B., Yurov, M., Zhang, J., and Zhao, Z. W.

Subjects
Hyperons in neutron stars, Economica, PE2_2, PE2_1, Settore FIS/04, Nuclear Theory, Socio-culturale, Ambientale, ddc:530, Hyperons's Scattering, Nuclear Experiment, PE2_3
Abstract

Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this is true, then hyperon-nucleon interactions will play a significant part in the neutron star equation of state. Yet, compared to other elastic scattering processes, there is very little data on \ud Λ\ud −\ud N\ud scattering. This experiment utilized the CEBAF Large Acceptance Spectrometer (CLAS) detector to study the \ud Λ\ud p\ud →\ud Λ\ud p\ud elastic scattering cross section in the incident \ud Λ\ud momentum range \ud 0.9\ud –\ud 2.0\ud \ud \ud GeV\ud /\ud c\ud . These are the first data on this reaction since the 1970s. The new cross sections have significantly better accuracy and precision than the existing world data, and the techniques developed here can also be used in future experiments.

Published
2021
Full Text
View/download PDF

6. Observation of Beam Spin Asymmetries in the Process ep→e^{'}π^{+}π^{-}X with CLAS12

Author

Hayward, T B, Dilks, C, Vossen, A, Avakian, H, Adhikari, S, Angelini, G, Arratia, M, Atac, H, Ayerbe Gayoso, C, Baltzell, N A, Barion, L, Battaglieri, M, Bedlinskiy, I, Benmokhtar, F, Bianconi, A, Biselli, A S, Bondì, M, Bossù, F, Boiarinov, S, Briscoe, W J, Brooks, W K, Bulumulla, D, Burkert, V D, Carman, D S, Carvajal, J C, Celentano, A, Chatagnon, P, Chetry, T, Ciullo, G, Clary, B A, Cole, P L, Contalbrigo, M, Costantini, G, Crede, V, D'Angelo, A, Dashyan, N, De Vita, R, Defurne, M, Deur, A, Diehl, S, Djalali, C, Dupre, R, Dugger, M, Egiyan, H, Ehrhart, M, El Alaoui, A, El Fassi, L, Elouadrhiri, L, Fegan, S, Filippi, A, Forest, T A, Gavalian, G, Gilfoyle, G P, Girod, F X, Glazier, Derek I., Golubenko, A A, Gothe, R W, Gotra, Y, Griffioen, K A, Guidal, M, Hafidi, K, Hakobyan, H, Hattawy, M, Hauenstein, F, Hicks, K, Hobart, A, Holtrop, M, Ireland, David G., Isupov, E L, Jo, H S, Joo, K, Joosten, S, Keller, D, Khachatryan, M, Khanal, A, Kim, A, Kim, W, Kripko, A, Kubarovsky, V, Kuhn, S E, Lanza, L, Leali, M, Lee, S, Lenisa, P, Livingston, Kenneth, MacGregor, I.D. Douglas, Marchand, D, Markov, N, Marsicano, L, Mascagna, V, McKinnon, Bryan, Meziani, Z E, Mirazita, M, Mokeev, V, Movsisyan, A, Munoz Camacho, C, Nadel-Turonski, P, Naidoo, Paul, Nanda, S, Neupane, K, Niccolai, S, Niculescu, G, O'Connell, T R, Osipenko, M, Paolone, M, Pappalardo, L L, Paremuzyan, R, Pasyuk, E, Phelps, W, Pogorelko, O, Prok, Y, Raue, B A, Ripani, M, Ritman, J, Rizzo, A, Rossi, P, Rowley, J, Sabatié, F, Salgado, C, Schmidt, A, Segarra, E P, Sharabian, Y G, Shrestha, U, Sokhan, Daria, Soto, O, Sparveris, N, Stepanyan, S, Strakovsky, I I, Strauch, S, Thornton, Adam, Tyler, N, Tyson, Richard, Ungaro, M, Venturelli, L, Voskanyan, H, Voutier, E, Watts, D P, Wei, K, Wei, X, Wood, M H, Yale, B, Zachariou, N, Zhang, J, and College of William and Mary [Williamsburg] (WM)

Subjects
[PHYS]Physics [physics], Parton Distribution Functions, Physics, Settore FIS/04, Nuclear Theory, NO, PE2_2, Quantum Chomodynamics, PE2_1, Quarks and Gluons, Physics::Accelerator Physics, High Energy Physics::Experiment, ddc:530, Nuclear Experiment, PE2_3, ComputingMilieux_MISCELLANEOUS
Abstract

The observation of beam spin asymmetries in two-pion production in semi-inclusive deep inelastic scattering off an unpolarized proton target is reported. The data presented here were taken in the fall of 2018 with the CLAS12 spectrometer using a 10.6 GeV longitudinally spin-polarized electron beam delivered by CEBAF at JLab. The measured asymmetries provide the first opportunity to extract the parton distribution function e(x), which provides information about the interaction between gluons and quarks, in a collinear framework that offers cleaner access than previous measurements. The asymmetries also constitute the first ever signal sensitive to the helicity-dependent two-pion fragmentation function G_{1}^{⊥}. A clear sign change is observed around the ρ mass that appears in model calculations and is indicative of the dependence of the produced pions on the helicity of the fragmenting quark.

Published
2021
Full Text
View/download PDF

7. Photoproduction of the $f_2(1270)$ meson using the CLAS detector

Author

Carver, M., Celentano, A., Hicks, K., Marsicano, L., Mathieu, V., Pilloni, A., Adhikari, K. P., Adhikari, S., Amaryan, M. J., Angelini, G., Atac, H., Baltzell, N. A., Barion, L., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bondi, M., Bossu, F., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Bulumulla, D., Burkert, V. D., Carman, D. S., Carvajal, J. C., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Clary, B. A., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., Ehrhart, M., Alaoui, A. E., Fassi, L. E., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Gavalian, G., Gevorgyan, N., Gilfoyle, G. P., Girod, F. X., Gothe, R. W., Griffioen, K. A., Hafidi, K., Hakobyan, H., Hattawy, M., Hayward, T. B., Heddle, D., Holtrop, M., Huang, Q., Hyde, C. E., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jenkins, D., H. S., Jo, Joo, K., Joosten, S., Keller, D., Khanal, A., Khandaker, M., Kim, A., Kim, C. W., Klein, F. J., Kripko, A., Kubarovsky, V., Lanza, L., Leali, M., Lenisa, P., Livingston, K., Macgregor, I. J. D., Marchand, D., Mascagna, V., Mccracken, M. E., Mckinnon, B., Meziani, Z. E., Mokeev, V., Movsisyan, A., Munevar, E., Camacho, C. M., Nadel-Turonski, P., Neupane, K., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Phelps, W., Pogorelko, O., Prok, Y., Protopopescu, D., Ripani, M., Ritchie, B. G., Ritman, J., Rizzo, A., Rosner, G., Rowley, J., Sabatie, F., Salgado, C., Schmidt, A., Schumacher, R. A., Sharabian, Y. G., Shrestha, U., Sokhan, D., Soto, O., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Tyler, N., Tyson, R., Ungaro, M., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D. P., Wei, K., Wei, X., Yale, B., Zachariou, N., Zhang, J., Zhao, Z. W., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and CLAS

Subjects
Quark Structure, Standard Model, Glueball, mesons, pions, High Energy Physics::Lattice, Nuclear Theory, FOS: Physical sciences, Socio-culturale, f2(1270): photoproduction, quark antiquark, quantum number, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, beam: energy, +pi%2B+pi%22">rho(770) --> pi+ pi, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Economica, PE2_2, background: low, PE2_1, CLAS, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, PE2_3, M005M, +pi0+pi0+p%22">photon rho(770) --> pi0 pi0 p, hep-ex, Physics, Settore FIS/04, High Energy Physics::Phenomenology, M005W, Ambientale, suppression, differential cross section, Elementary Particles and Fields, High Energy Physics::Experiment, Particle Physics - Experiment, Jefferson Lab
Abstract

The quark structure of the $f_2(1270)$ meson has, for many years, been assumed to be a pure quark-antiquark ($q\bar{q}$) resonance with quantum numbers $J^{PC} = 2^{++}$. Recently, it was proposed that the $f_2(1270)$ is a molecular state made from the attractive interaction of two $\rho$-mesons. Such a state would be expected to decay strongly to final states with charged pions, due to the dominant decay $\rho \to \pi^+ \pi^-$, whereas decay to two neutral pions would likely be suppressed. Here, we measure for the first time the reaction $\gamma p \to \pi^0 \pi^0 p$, using the CLAS detector at Jefferson Lab for incident beam energies between 3.6-5.4~GeV. Differential cross sections, $d\sigma / dt$, for $f_2(1270)$ photoproduction are extracted with good precision, due to low backgrounds, and are compared with theoretical calculations., Comment: 5 pages, 4 figures

Published
2021
Full Text
View/download PDF

8. Differential cross sections for Λ(1520) using photoproduction at CLAS

Author

Shrestha, U., Chetry, T., Djalali, C., Hicks, K., Nam, S. i., Adhikari, K. P., Adhikari, S., Amaryan, M. J., Angelini, G., Atac, H., Barion, L., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bondi, M., Bossù, F., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Bulumulla, D., Burkert, V. D., Carman, D. S., Carvajal, J. C., Celentano, A., Chatagnon, P., Ciullo, G., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Diehl, S., Dugger, M., Dupre, R., Egiyan, H., Ehrhart, M., El Fassi, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Glazier, D. I., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hattawy, M., Hayward, T. B., Heddle, D., Holtrop, M., Huang, Q., Ireland, David G., Isupov, E. L., Jo, H. S., Joo, K., Joosten, S., Keller, D., Khanal, A., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Kripko, A., Kubarovsky, V., Lanza, L., Leali, M., Lenisa, P., Livingston, Kenneth, MacGregor, I.J. Douglas, Marchand, D., Marsicano, L., Mascagna, V., McCracken, M. E., McKinnon, Bryan, Mokeev, V., Movsisyan, A., Munevar, E., Munoz Camacho, C., Nadel-Turonski, P., Neupane, K., Niccolai, S., Niculescu, G., O'Connell, T., Osipenko, M., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pivnyuk, N., Pogorelko, O., Poudel, J., Prok, Y., Ripani, M., Ritman, J., Rizzo, A., Rosner, Guenther, Rowley, J., Sabatié, F., Salgado, C., Schmidt, A., Schumacher, R. A., Sharabian, Y. G., Soto, O., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Tyler, N., Ungaro, M., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D. P., Wei, K., Wei, X., Wood, M. H., Yale, B., Zachariou, N., Zhang, J., Zhao, Z. W., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), CLAS, and Ohio University

Subjects
Particle physics, Photon, Hadronic Physics and QCD, Socio-culturale, Photon energy, Newport News CEBAF Linac, Lambda, momentum transfer dependence, 01 natural sciences, High Energy Physics - Experiment, differential cross section: measured, Economica, PE2_2, PE2_1, CLAS, Quark Models, hadron spectra, photoproduction, 0103 physical sciences, +Sigma-+pi%2B%22">Lambda(1520) --> Sigma- pi+, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, Invariant (mathematics), Nuclear Experiment, 010306 general physics, +K%2B+Lambda%281520%29%22">photon p --> K+ Lambda(1520), PE2_3, ComputingMilieux_MISCELLANEOUS, Physics, [PHYS]Physics [physics], 010308 nuclear & particles physics, Settore FIS/04, Quark model, Ambientale, Function (mathematics), State (functional analysis), photon: energy, Baryon, angular dependence, +Sigma%2B+pi%22">Lambda(1520) --> Sigma+ pi, Lambda(1520): photoproduction, Jefferson Lab, experimental results
Abstract

The reaction $\gamma p \rightarrow K^{+} \Lambda(1520)$ using photoproduction data from the CLAS $g12$ experiment at Jefferson Lab is studied. The decay of $\Lambda(1520)$ into two exclusive channels, $\Sigma^{+}\pi^{-}$ and $\Sigma^{-}\pi^{+}$, is studied from the detected $K^{+}$, $\pi^{+}$, and $\pi^{-}$ particles. A good agreement is established for the $\Lambda(1520)$ differential cross sections with the previous CLAS measurements. The differential cross sections as a function of CM angle are extended to higher photon energies. Newly added are the differential cross sections as a function of invariant 4-momentum transfer $t$, which is the natural variable to use for a theoretical model based on a Regge-exchange reaction mechanism. No new $N^*$ resonances decaying into the $K^+\Lambda(1520)$ final state are found., Comment: 16 pages, 12 figures, 2 tables

Published
2021
Full Text
View/download PDF

9. Measurement of deeply virtual Compton scattering off He 4 with the CEBAF Large Acceptance Spectrometer at Jefferson Lab

Author

Dupré, R., Hattawy, M., Baltzell, N. A., Bültmann, S., De Vita, R., El Alaoui, A., El Fassi, L., Egiyan, H., Girod, F. X., Guidal, M., Hafidi, K., Jenkins, D., Liuti, S., Perrin, Y., Stepanyan, S., Torayev, B., Voutier, E., Amaryan, M. J., Armstrong, W. R., Atac, H., Ayerbe Gayoso, C., Barion, L., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bondi, M., Bossù, F., Boiarinov, S., Briscoe, W. J., Bulumulla, D., Burkert, V., Carman, D. S., Carvajal, J. C., Caudron, M., Celentano, A., Chatagnon, P., Chesnokov, V., Chetry, T., Ciullo, G., Clary, B. A., Cole, P. L., Contalbrigo, M., Costantini, G., Crede, V., D'Angelo, A., Dashyan, N., Defurne, M., Deur, A., Diehl, S., Djalali, C., Ehrhart, M., Elouadrhiri, L., Eugenio, P., Fegan, S., Filippi, A., Forest, T. A., Ghandilyan, Y., Gilfoyle, G. P., Gothe, R. W., Griffioen, K. A., Hakobyan, H., Hayward, T. B., Hicks, K., Hobart, A., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jo, H. S., Joo, K., Joosten, S., Keller, D., Khachatryan, G., Khanal, A., Khandaker, M., Kim, A., Kim, W., Kripko, A., Kubarovsky, V., Kuhn, S. E., Lanza, L., Livingston, K., Kabir, M. L., Leali, M., Lenisa, P., MacGregor, I. J. D., Marchand, D., Markov, N., Mascagna, V., Mayer, M., McKinnon, B., Mirazita, M., Mokeev, V. I., Neupane, K., Niccolai, S., O'Connell, T. R., Osipenko, M., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Payette, D., Phelps, W., Pivnyuk, N., Pogorelko, O., Poudel, J., Prok, Y., Ripani, M., Ritman, J., Rizzo, A., Rosner, G., Rossi, P., Rowley, J., Sabatié, F., Salgado, C., Schmidt, A., Schumacher, R., Sergeyeva, V., Sharabian, Y., Shrestha, U., Sokhan, D., Soto, O., Sparveris, N., Strakovsky, I. I., Strauch, S., Tyler, N., Ungaro, M., Venturelli, L., Voskanyan, H., Vossen, A., Watts, D., Wei, K., Wei, X., Weinstein, L. B., Wishart, R., Wood, M. H., Yale, B., Zachariou, N., and Zhang, J.

Subjects
GPDs and TMDs, Settore FIS/04, NO, Deep Virtual Compton Scattering, Proton Structure, PE2_2, PE2_1, spin Asymmetry, Physics::Accelerator Physics, High Energy Physics::Experiment, ddc:530, Nuclear Experiment, Quark Structure of the nucleus, PE2_3
Abstract

We report on the measurement of the beam spin asymmetry in the deeply virtual Compton scattering off He-4 using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab using a 6 GeV longitudinally polarized electron beam incident on a pressurized He-4 gaseous target. We detail the method used to ensure the exclusivity of the measured reactions, in particular the upgrade of CLAS with a radial time projection chamber to detect the low-energy recoiling He-4 nuclei and an inner calorimeter to extend the photon detection acceptance at forward angles. Our results confirm the theoretically predicted enhancement of the coherent (e(4)He -> e'4He'gamma') beam spin asymmetries compared to those observed on the free proton, while the incoherent (e(4)He -> e'p'gamma'X') asymmetries exhibit a 30% suppression. From the coherent data, we were able to extract, in a model-independent way, the real and imaginary parts of the only He-4 Compton form factor, H-A, leading the way toward 3D imaging of the partonic structure of nuclei.

Published
2021
Full Text
View/download PDF

10. Photoproduction of eta mesons off the proton for 1.2<Eγ<4.7 GeV using CLAS at Jefferson Laboratory

Author

Hu, T, Akbar, Z, Crede, V, Adhikari, Kp, Adhikari, S, Amaryan, Mj, Angelini, G, Asryan, G, Atac, H, Ayerbe Gayoso, C, Barion, L, Battaglieri, M, Bedlinskiy, I, Benmokhtar, F, Bianconi, A, Biselli, As, Bossu, F, Boiarinov, S, Briscoe, Wj, Brooks, Wk, Carman, Ds, Carvajal, J, Celentano, A, Chatagnon, P, Chetry, T, Ciullo, G, Clark, L, Clary, Ba, Cole, Pl, Contalbrigo, M, Cruz-Torres, R, D'Angelo, A, Dashyan, N, De Vita, R, Defurne, M, Deur, A, Diehl, S, Djalali, C, Dugger, M, Dupre, R, Egiyan, H, Ehrhart, M, El Alaoui, A, El Fassi, L, Eugenio, P, Fedotov, G, Fersch, R, Filippi, A, Gavalian, G, Gilfoyle, Gp, Girod, Fx, Glazier, Di, Golovatch, E, Gothe, Rw, Griffioen, Ka, Guidal, M, Guo, L, Hafidi, K, Hakobyan, H, Hanretty, C, Harrison, N, Hattawy, M, Hayward, Tb, Heddle, D, Hicks, K, Hobart, A, Holtrop, M, Ilieva, Y, Illari, I, Ireland, Dg, Ishkhanov, Bs, Isupov, El, Jenkins, D, H. S., J, Joo, K, Joosten, S, Keller, D, Khachatryan, M, Khanal, A, Khandaker, M, Kim, A, Kim, Cw, Kim, W, Klein, Fj, Kubarovsky, V, Lanza, L, Leali, M, Lenisa, P, Livingston, K, Macgregor, Ijd, Marchand, D, Markov, N, Mascagna, V, Mccracken, Me, Mckinnon, B, Meyer, Ca, Meziani, Ze, Mineeva, T, Mokeev, V, Movsisyan, A, Munevar, E, Munoz Camacho, C, Nadel-Turonski, P, Niccolai, S, Niculescu, G, O'Connell, T, Osipenko, M, Ostrovidov, Ai, Paolone, M, Pappalardo, Ll, Paremuzyan, R, Pasyuk, E, Phelps, W, Pogorelko, O, Poudel, J, Price, Jw, Prok, Y, Protopopescu, D, Raue, Ba, Ripani, M, Ritman, J, Rizzo, A, Rosner, G, Rowley, J, Sabatie, F, Salgado, C, Schmidt, A, Schumacher, Ra, Sharabian, Yg, Shrestha, U, Skorodumina, I, Sokhan, D, Soto, O, Sparveris, N, Stepanyan, S, Stoler, P, Strakovsky, Ii, Strauch, S, Tan, Ja, Tyler, N, Ungaro, M, Venturelli, L, Voskanyan, H, Voutier, E, Watts, Dp, Wei, K, Wei, X, Wood, Mh, Zachariou, N, Zhang, J, and Zhao, Zw

Subjects
Settore FIS/04
Published
2020

11. First measurement of direct photoproduction of the a2(1320)0 meson on the proton

Author

Celentano, A., Battaglieri, M., De Vita, R., Marsicano, L., Mathieu, V., Pilloni, A., Szczepaniak, A., Adhikari, K. P., Adhikari, S., Amaryan, M. J., Angelini, G., Atac, H., Barion, L., Bedlinskiy, I., Benmokhtar, Fatiha, Bianconi, A., Biselli, A. S., Bossù, F., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Bulumulla, D., Burkert, V. D., Carman, D. S., Carvajal, J. C., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., Cruz-Torres, R., D'Angelo, A., Dashyan, N., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., Ehrhart, M., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Gavalian, G., Gevorgyan, N., Girod, F. X., Glazier, D. I., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Hafidi, K., Hakobyan, H., Harrison, N., Hattawy, M., Hauenstein, F., Hayward, T. B., Heddle, D., Hicks, K., Hobart, A., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jo, H. S., Joo, K., Joosten, S., Keller, D., Khachatryan, M., Khanal, A., Khandaker, M., Kim, A., Kim, C. W., Kim, W., Klein, F. J., Kubarovsky, V., Lanza, L., Leali, M., Lenisa, P., Livingston, K., Lucherini, V., MacGregor, I. J. D., Marchand, D., Markov, N., Mascagna, V., McCracken, M. E., McKinnon, B., Meziani, Z.-E., Mirazita, M., Mokeev, V., Movsisyan, A., Munevar, E., Munoz Camacho, C., Nadel-Turonski, P., Neupane, K., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Phelps, W., Pogorelko, O., Price, J. W., Prok, Y., Ripani, M., Ritman, J., Rizzo, A., Rosner, G., Rowley, J., Sabatié, F., Salgado, C., Schmidt, A., Schumacher, R. A., Shrestha, U., Sokan, D., Soto, O., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Tan, J. A., Tyler, N., Ungaro, M., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., Zhao, Z. W., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and CLAS

Subjects
Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Hadronic Physics and QCD, Socio-culturale, FOS: Physical sciences, Regge, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], beam: energy, High Energy Physics - Experiment, Nuclear Theory (nucl-th), differential cross section: measured, High Energy Physics - Experiment (hep-ex), PE2_2, PE2_1, CLAS, mass spectrum: (pi0 eta), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], angular distribution, photon p: exclusive reaction, Nuclear Experiment (nucl-ex), Nuclear Experiment, PE2_3, Nucleons, Mesons, Settore FIS/04, photon p: inelastic scattering, partial wave analysis, photon: energy, Photoproduction, meson: photoproduction, experimental results
Abstract

We present the first measurement of the exclusive reaction $\gamma p \rightarrow a_2(1320)^0 \, p$ in the photon energy range $3.5$-$5.5$ GeV and four-momentum transfer squared $0.2, Comment: Version accepted for publication in PRC, "Rapid Communications" section

Published
2020
Full Text
View/download PDF

12. Exclusive electroproduction off protons in the resonance region at photon virtualities

Author

Markov, N, Joo, K, Burkert, Vd, Mokeev, V, Smith, Lc, Ungaro, M, Adhikari, S, Amaryan, Mj, Angelini, G, Atac, H, Avakian, H, Ayerbe Gayoso, C, Baltzell, Na, Barion, L, Battaglieri, M, Bedlinskiy, I, Benmokhtar, F, Biselli, As, Bossù, F, Boiarinov, S, Briscoe, Wj, Brooks, Wk, Carman, Ds, Carvajal, Jc, Celentano, A, Chatagnon, P, Chetry, T, Cole, Pl, Contalbrigo, M, Crede, V, Ciullo, G, D'Angelo, A, Dashyan, N, De Vita, R, De Sanctis, E, Defurne, M, Deur, A, Diehl, S, Djalali, C, Dupre, R, Ehrhart, M, El Alaoui, A, El Fassi, L, Eugenio, Pl, Evans, C, Filippi, A, Ghandilyan, Y, Girod, Fx, Golovatch, E, Gothe, Rw, Griffioen, Ka, Guidal, M, Hafidi, K, Hakobyan, H, Hattawy, M, Hayward, Tb, Hicks, K, Holtrop, M, Ilieva, Y, Ireland, Dg, Ishkhanov, Bs, Isupov, El, Jenkins, D, H. S, J, Keller, D, Khachatryan, M, Khanal, A, Khandaker, M, Kim, A, Kim, Cw, Kim, W, Klein, Fj, Kubarovsky, V, Lanza, L, Leali, M, Livingston, K, Macgregor, Ijd, Marchand, D, Mascagna, V, Mckinnon, B, Mineeva, T, Mirazita, M, Nadel-Turonski, P, Nanda, S, Niccolai, Sn, Niculescu, V, G, Osipenko, M, Paolone, M, Pappalardo, Ll, Paremuzyan, R, Park, K, Pasyuk, E, Phelps, W, Pogorelko, O, Price, Jw, Prok, Y, Protopopescu, D, Ripani, M, Riser, D, Rizzo, A, Rosner, G, Rowley, J, Sabatié, F, Salgado, C, Schumacher, Ra, Sharabian, Yg, Shrestha, U, Sokhan, D, Soto, O, Sparveris, N, Stepanyan, S, Stoler, P, Strakovsky, Ii, Strauch, S, Taiuti, M, Tan, Ja, Tyler, N, Venturelli, L, Voskanyan, H, Voutier, E, Wang, R, Wei, X, Wood, Mh, Zachariou, N, and The CLAS Collaboration

Subjects
Settore FIS/04
Published
2020

13. Probing the core of the strong nuclear interaction

Author

Schmidt, A, Pybus, J, Weiss, R, Segarra, E, Hrnjic, A, Denniston, A, Hen, O, Piasetzky, E, Weinstein, L, Barnea, N, Strikman, M, Larionov, A, Higinbotham, D, Adhikari, S, Amaryan, M, Angelini, G, Asryan, G, Atac, H, Avakian, H, Gayoso, C, Baashen, L, Barion, L, Bashkanov, M, Battaglieri, M, Beck, A, Bedlinskiy, I, Benmokhtar, F, Bianconi, A, Biselli, A, Bossu, F, Boiarinov, S, Brahim, M, Briscoe, W, Brooks, W, Burkert, V, Cao, F, Carman, D, Carvajal, J, Celentano, A, Chatagnon, P, Chetry, T, Ciullo, G, Clark, L, Cohen, E, Cole, P, Contalbrigo, M, Crede, V, Cruz-Torres, R, D'Angelo, A, Dashyan, N, De Vita, R, De Sanctis, E, Defurne, M, Deur, A, Diehl, S, Djalali, C, Duer, M, Dugger, M, Dupre, R, Egiyan, H, Ehrhart, M, El Alaoui, A, El Fassi, L, Eugenio, P, Filippi, A, Forest, T, Gavalian, G, Gilad, S, Gilfoyle, G, Giovanetti, K, Girod, F, Giuseppe, C, Glazier, D, Golovatch, E, Gothe, R, Griffioen, K, Guo, L, Hafidi, K, Hakobyan, H, Hanretty, C, Harrison, N, Hattawy, M, Hauenstein, F, Hayward, T, Hicks, K, Holtrop, M, Ilieva, Y, Illari, I, Ireland, D, Ishkanov, B, Isupov, E, Jenkins, D, Hs, J, Joo, K, Keller, D, Khachatryan, M, Khanal, A, Khandaker, M, Kim, C, Kim, W, Klein, F, Korover, I, Kubarovsky, V, Lanza, L, Leali, M, Lenisa, P, Macgregor, I, Marchand, D, Markov, N, Marsicano, L, Mascagna, V, Beck, S, Mckinnon, B, Mirazita, M, Mokeev, V, Camacho, C, Mustafa, B, Nadel-Turonski, P, Nanda, S, Niccolai, S, Niculescu, G, Osipenko, M, Ostrovidov, A, Paolone, M, Pappalardo, L, Paremuzyan, R, Park, K, Pasyuk, E, Patsyuk, M, Phelps, W, Pogorelko, O, Price, J, Prok, Y, Protopopescu, D, Ripani, M, Riser, D, Rizzo, A, Rosner, G, Rossi, P, Sabatie, F, Salgado, C, Schmookler, B, Schumacher, R, Sharabian, Y, Shrestha, U, Skorodumina, I, Sokhan, D, Soto, O, Sparveris, N, Stepanyan, S, Strakovsky, I, Strauch, S, Tan, J, Tyler, N, Ungaro, M, Venturelli, L, Voskanyan, H, Voutier, E, Wang, R, Watts, D, Wei, X, Wood, M, Zachariou, N, Zhang, J, Zhao, Z, Zheng, X, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CLAS, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Nuclear Theory, nucleon: pair, Socio-culturale, Nuclear Interactions, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure, spin: dependence, 01 natural sciences, 7. Clean energy, Nuclear physics, Nuclear Theory (nucl-th), PE2_1, CLAS, 0103 physical sciences, quantum chromodynamics, Neutron, density: high, Nuclear Models, Quarks and Gluons, Electron Scattering, Spin Dependent Cross Sections, Nuclear Experiment (nucl-ex), 010306 general physics, neutron star, Nuclear Experiment, PE2_3, nucleus: interaction, Physics, Quantum chromodynamics, Multidisciplinary, 010308 nuclear & particles physics, Settore FIS/04, Nuclear matter, Fundamental interaction, quark gluon: interaction, Neutron star, electron: scattering, kinematics, nuclear matter, Atomic nucleus, Quark–gluon plasma, Nucleon, experimental results
Abstract

The strong nuclear interaction between nucleons (protons and neutrons) is the effective force that holds the atomic nucleus together. This force stems from fundamental interactions between quarks and gluons (the constituents of nucleons) that are described by the equations of Quantum Chromodynamics (QCD). However, as these equations cannot be solved directly, physicists resort to describing nuclear interactions using effective models that are well constrained at typical inter-nucleon distances in nuclei but not at shorter distances. This limits our ability to describe high-density nuclear matter such as in the cores of neutron stars. Here we use high-energy electron scattering measurements that isolate nucleon pairs in short-distance, high-momentum configurations thereby accessing a kinematical regime that has not been previously explored by experiments, corresponding to relative momenta above 400 MeV/c. As the relative momentum between two nucleons increases and their separation thereby decreases, we observe a transition from a spin-dependent tensor-force to a predominantly spin-independent scalar-force. These results demonstrate the power of using such measurements to study the nuclear interaction at short-distances and also support the use of point-like nucleons with two- and three-body effective interactions to describe nuclear systems up to densities several times higher than the central density of atomic nuclei., Comment: Total 26 pages, 13 figures. Main text: 8 pages, 3 figures. Methods section: 6 pages. Extended Data: 8 figures, 1 table. Supplementary Materials: 8 pages, 2 figures

Published
2020
Full Text
View/download PDF

14. First Measurements of the Double-Polarization Observables F, P, and H in ω Photoproduction off Transversely Polarized Protons in the N∗ Resonance Region

Author

Roy, P., Park, S., Crede, V., Anisovich, A. V., Klempt, E., Nikonov, V. A., Sarantsev, A. V., Wei, N. C., Huang, F., Nakayama, K., Adhikari, K. P., Adhikari, S., Angelini, G., Avakian, H., Barion, L., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Brock, J., Brooks, W. K., Burkert, V. D., Cao, F., Carlin, C., Carman, D. S., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Cole, P. L., Contalbrigo, M., Cortes, O., D’Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Diehl, S., Djalali, C., Dugger, M., Dupre, R., Duran, B., Egiyan, H., Ehrhart, M., El Alaoui, A., El Fassi, L., Eugenio, P., Fegan, S., Filippi, A., Fradi, A., Gilfoyle, G. P., Girod, F. X., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hanretty, C., Harrison, N., Hattawy, M., Hayward, T. B., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jo, H. S., Johnston, S., Joosten, S., Kabir, M. L., Keith, C. D., Keller, D., Khachatryan, G., Khachatryan, M., Khanal, A., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Kubarovsky, V., Kuleshov, S. V., Kunkel, M. C., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I.J.D., Marchand, D., McKinnon, B., Meekins, D. G., Meyer, C. A., Mineeva, T., Mokeev, V., Montgomery, R.A., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Payette, D., Phelps, W., Pierce, J., Pogorelko, O., Prok, Y., Protopopescu, D., Raue, B. A., Ripani, M., Riser, D., Ritchie, B. G., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Schumacher, R. A., Seely, M. L., Sharabian, Y. G., Shrestha, U., Skorodumina, Iu., Sokhan, D., Soto, O., Sparveris, N., Strakovsky, I. I., Strauch, S., Taiuti, M., Tan, J. A., Torayev, B., Tyler, N., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Wang, R., Watts, D. P., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., Zhao, Z. W., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), CLAS, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112))

Subjects
Nuclear Theory, partial wave, Socio-culturale, nucleon resonance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], High Energy Physics - Experiment, Photonuclear reactions, Color confinement, Polarization phenomena, QCD in nuclear reactions, Resonance reactions, CLAS, Resonance reactions, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, Nuclear Physics, Settore FIS/04, Polarization phenomena, photon, nucleon, Photonuclear reactions, Color confinement, Automatic Keywords, transverse, QCD in nuclear reactions, polarization: target, Physics::Accelerator Physics, data management, asymmetry, experimental results, Jefferson Lab, photoproduction
Abstract

First measurements of double-polarization observables in $\omega$ photoproduction off the proton are presented using transverse target polarization and data from the CEBAF Large Acceptance Spectrometer (CLAS) FROST experiment at Jefferson Lab. The beam-target asymmetry $F$ has been measured using circularly polarized, tagged photons in the energy range 1200 - 2700 MeV, and the beam-target asymmetries $H$ and $P$ have been measured using linearly polarized tagged photons in the energy range 1200 - 2000 MeV. These measurements significantly increase the database on polarization observables. The results are included in two partial-wave analyses and reveal significant contributions from several nucleon ($N^\ast$) resonances. In particular, contributions from new $N^\ast$ resonances listed in the Review of Particle Properties are observed, which aid in reaching the goal of mapping out the nucleon resonance spectrum., Comment: Two authors added, figures updated

Published
2019
Full Text
View/download PDF

15. Measurement of charged-pion production in deep-inelastic scattering off nuclei with the CLAS detector

Author

Morán, S., Dupre, R., Hakobyan, H., Arratia, M., Brooks, W. K., Bórquez, A., Alaoui, A. El, Fassi, L. El, Hafidi, K., Mendez, R., Mineeva, T., Paul, S. J., Amaryan, M. J., Angelini, Giovanni, Armstrong, Whitney R., Atac, H., Baltzell, N. A., Barion, L., Bashkanov, M., Battaglieri, M., Bedlinskiy, I., Benmokhtar, Fatiha, Bianconi, A., Biondo, L., Biselli, A. S., Bossù, F., Boiarinov, S., Briscoe, W. J., Bulumulla, D., Burkert, V. D., Carman, D. S., Chatagnon, P., Chesnokov, V., Chetry, T., Ciullo, G., Cole, P. L., Contalbrigo, M., Costantini, G., D'Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Diehl, S., Djalali, C., Egiyan, H., Elouadrhiri, L., Eugenio, P., Fersch, R., Filippi, A., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Golubenko, A. A., Gothe, R. W., Griffioen, K. A., Guidal, M., Hattawy, M., Hauenstein, F., Hayward, T. B., Heddle, D., Hicks, K., Hobart, A., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jo, H. S., Keller, D., Khanal, A., Khandaker, M., Kim, W., Klein, F. J., Kripko, A., Kubarovsky, V., Kuhn, S. E., Lanza, L., Leali, M., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Marsicano, L., Mascagna, V., McKinnon, B., McLauchlin, C., Meziani, Z. E., Migliorati, S., Mirazita, M., Mokeev, V., Camacho, C. Munoz, Nadel-Turonski, P., Neupane, K., Niccolai, S., Niculescu, G., O'Connell, T. R., Osipenko, M., Ostrovidov, A. I., Ouillon, M., Pandey, P., Paolone, M., Pappalardo, L. L., Pasyuk, E., Phelps, W., Pogorelko, O., Poudel, J., Price, J. W., Prok, Y., Raue, B. A., Reed, Trevor, Ripani, M., Ritman, J., Rizzo, A., Rosner, G., Rowley, J., Sabatié, F., Salgado, C., Schmidt, A., Schumacher, R. A., Sharabian, Y. G., Shirokov, E. V., Shrestha, U., Sokhan, D., Soto, O., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Tyson, R., Ungaro, M., Venturelli, L., Voskanyan, H., Vossen, A., Voutier, E., Watts, D. P., Wei, Kevin, Wei, X., Weinstein, L. B., Wishart, R., Wood, M. H., Yale, B., Zachariou, N., Zhang, J., Zhao, Z. W., Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and CLAS

Subjects
Electron-nucleon Scattering, dimension: 3, Nuclear Theory, Socio-culturale, FOS: Physical sciences, gluon: bremsstrahlung, pi: production, Newport News CEBAF Linac, transverse momentum, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure, model: parton, Computer Science::Digital Libraries, fragmentation function, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Economica, PE2_2, PE2_1, CLAS, transport theory, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, Nuclear Experiment (nucl-ex), electron: beam, quark: energy loss, Nuclear Experiment, PE2_3, pi: energy, deep inelastic scattering: semi-inclusive reaction, multiplicity: ratio, Settore FIS/04, Deep Inelastic Scattering, Ambientale, multiplicity: dependence, QCD, flavor: dependence, hadron: formation, kinematics, nuclear matter, fractional, Quarks and Gluons, High Energy Physics::Experiment, hadronization, experimental results
Abstract

Background: Energetic quarks in nuclear DIS propagate through the nuclear medium. Processes that are believed to occur inside nuclei include quark energy loss through medium-stimulated gluon bremsstrahlung and intra-nuclear interactions of forming hadrons. More data are required to gain a more complete understanding of these effects. Purpose: To test the theoretical models of parton transport and hadron formation, we compared their predictions for the nuclear and kinematic dependence of pion production in nuclei. Methods: We have measured charged-pion production in semi-inclusive DIS off D, C, Fe, and Pb using the CLAS detector and the CEBAF 5.014 GeV electron beam. We report results on the nuclear-to-deuterium multiplicity ratio for $\pi^{+}$ and $\pi^{-}$ as a function of energy transfer, four-momentum transfer, and pion energy fraction or transverse momentum - the first three-dimensional study of its kind. Results: The $\pi^{+}$ multiplicity ratio is found to depend strongly on the pion fractional energy $z$, and reaches minimum values of $0.67\pm0.03$, $0.43\pm0.02$, and $0.27\pm0.01$ for the C, Fe, and Pb targets, respectively. The $z$ dependences of the multiplicity ratios for $\pi^{+}$ and $\pi^{-}$ are equal within uncertainties for C and Fe targets but show differences at the level of 10$\%$ for the Pb-target data. The results are qualitatively described by the GiBUU transport model, as well as with a model based on hadron absorption, but are in tension with calculations based on nuclear fragmentation functions. Conclusions: These precise results will strongly constrain the kinematic and flavor dependence of nuclear effects in hadron production, probing an unexplored kinematic region. They will help to reveal how the nucleus reacts to a fast quark, thereby shedding light on its color structure, transport properties, and on the mechanisms of the hadronization process., Comment: 22 pages, 5 figures, 12 tables

Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results