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303 results on '"Rimal, D."'

1. The COHERENT Experimental Program

Author: Akimov, D., Alawabdeh, S., An, P., Arteaga, A., Awe, C., Barbeau, P. S., Barry, C., Becker, B., Belov, V., Bernardi, I., Blackston, M. A., Blokland, L., Bock, C., Bodur, B., Bolozdynya, A., Bouabid, R., Bracho, A., Browning, J., Cabrera-Palmer, B., Chen, N., Chernyak, D., Conley, E., Daughhetee, J., Daughtry, J., Day, E., Coello, M. del Valle, Detwiler, J., Ding, K., Durand, M. R., Efremenko, Y., Elliott, S. R., Fabris, L., Febbraro, M., Fox, W., Galambos, J., Rosso, A. Gallo, Galindo-Uribarri, A., Gilbert, C., Green, M. P., Hansen, K. R., Harris, B., Heath, M. R., Hedges, S., Henderson, R., Hoang, D., Hughes, C., Hughes, M., Iverson, E., Jairam, P., Johnson, B. A., Johnson, T., Kaufman, L., Khromov, A., Konovalov, A., Koros, J., Kozlova, E., Kumpan, A., Li, L., Librande, J. T., Link, J. M., Liu, J., Major, A., Mann, K., Markoff, D. M., Mastroberti, J., Mattingly, J., McGoldrick, O., McIntyre, M., Melikyan, Y. A., Mishra, M., Mueller, P. E., Newby, J., Parno, D. S., Penne, A., Penttila, S. I., Pershey, D., Prior, C., Radford, D., Rahman, F., Rapp, R., Ray, H., Raybern, J., Razuvaeva, O., Reyna, D., Rich, G. C., Rimal, D., Ross, J., Rouzky, A., Rudik, D., Runge, J., Salvat, D. J., Salyapongse, A. M., Sander, J., Scholberg, K., Siehien, P., Shakirov, A., Simakov, G., Sinev, G., Snow, W. M., Sosnovstsev, V., Steele, J., Hjelmstad, A. Strasbaugh, Subedi, T., Suh, B., Tayloe, R., Tellez-Giron-Flores, K., Thornton, R. T., Tolstukhin, I., Trotter, S., Tsai, F., Tsai, Y. -T., Ujah, E., Vanderwerp, J., van Nieuwenhuizen, E., Varner, R. L., Vasquez, S., Virtue, C. J., Visser, G., Walkup, K., Wang, J., Ward, E. M., Wiseman, C., Wongjirad, T., Wu, D., Yang, J., Yang, Y., Yen, Y. -R., Yoo, J., Yu, C. -H., Zettlemoyer, J., and Zhang, S.
Subjects: High Energy Physics - Experiment, Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract: The COHERENT experiment located in Neutrino Alley at the Spallation Neutron Source (SNS), Oak Ridge National Laboratory (ORNL), has made the world's first two measurements of coherent elastic neutrino-nucleus scattering (CEvNS), on CsI and argon, using neutrinos produced at the SNS. The COHERENT collaboration continues to pursue CEvNS measurements on various targets as well as additional studies of inelastic neutrino-nucleus interactions, searches for accelerator-produced dark matter (DM) and physics beyond the Standard Model, using the uniquely high-quality and high-intensity neutrino source available at the SNS. This white paper describes primarily COHERENT's ongoing and near-future program at the SNS First Target Station (FTS). Opportunities enabled by the SNS Second Target Station (STS) for the study of neutrino physics and development of novel detector technologies are elaborated in a separate white paper., Comment: 38 papers, 24 figures; Snowmass contribution
Published: 2022

2. Simulating the neutrino flux from the Spallation Neutron Source for the COHERENT experiment

Author: COHERENT Collaboration, Akimov, D., An, P., Awe, C., Barbeau, P. S., Becker, B., Belov, V., Bernardi, I., Blackston, M. A., Bock, C., Bolozdynya, A., Browning, J., Cabrera-Palmer, B., Chernyak, D., Conley, E., Daughhetee, J., Detwiler, J., Ding, K., Durand, M. R., Efremenko, Y., Elliott, S. R., Fabris, L., Febbraro, M., Galambos, J., Rosso, A. Gallo, Galindo-Uribarri, A., Green, M. P., Heath, M. R., Hedges, S., Hoang, D., Hughes, M., Iverson, E., Johnson, T., Khromov, A., Konovalov, A., Kozlova, E., Kumpan, A., Li, L., Link, J. M., Liu, J., Mann, K., Markoff, D. M., Mastroberti, J., McIntyre, M., Mueller, P. E., Newby, J., Parno, D. S., Penttila, S. I., Pershey, D., Rapp, R., Ray, H., Raybern, J., Razuvaeva, O., Reyna, D., Rich, G. C., Rimal, D., Ross, J., Rudik, D., Runge, J., Salvat, D. J., Salyapongse, A. M., Scholberg, K., Shakirov, A., Simakov, G., Sinev, G., Snow, W. M., Sosnovstsev, V., Suh, B., Tayloe, R., Tellez-Giron-Flores, K., Tolstukhin, I., Trotter, S., Ujah, E., Vanderwerp, J., Varner, R. L., Virtue, C. J., Visser, G., Wongjirad, T., Yen, Y. -R., Yoo, J., Yu, C. -H., Zettlemoyer, J., and Zhang, S.
Subjects: High Energy Physics - Experiment, Nuclear Experiment
Abstract: The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory is a pulsed source of neutrons and, as a byproduct of this operation, an intense source of pulsed neutrinos via stopped-pion decay. The COHERENT collaboration uses this source to investigate coherent elastic neutrino-nucleus scattering and other physics with a suite of detectors. This work includes a description of our Geant4 simulation of neutrino production at the SNS and the flux calculation which informs the COHERENT studies. We estimate the uncertainty of this calculation at about 10% based on validation against available low-energy pion production data.
Published: 2021

3. Use of Neutrino Scattering Events with Low Hadronic Recoil to Inform Neutrino Flux and Detector Energy Scale

Author: Bashyal, A., Rimal, D., Messerly, B., Dar, Z. Ahmad, Akbar, F., Ascencio, M. V., Bercellie, A., Betancourt, M., Bodek, A., Bonilla, J. L., Bravar, A., Budd, H., Caceres, G., Cai, T., Carneiro, M. F., da Motta, H., Dytman, S. A., Díaz, G. A., Felix, J., Fields, L., Filkins, A., Fine, R., Gago, A. M., Gallagher, H., Ghosh, A., Gilligan, S. M., Gran, R., Harris, D. A., Henry, S., Jena, S., Jena, D., Kleykamp, J., Kordosky, M., Last, D., Lozano, A., Lu, X. -G., Maher, E., Manly, S., Mann, W. A., Mauger, C., McFarland, K. S., Miller, J., Morfín, J. G., Naples, D., Nelson, J. K., Nguyen, C., Olivier, A., Paolone, V., Perdue, G. N., Ramírez, M. A., Ray, H., Ruterbories, D., Schellman, H., Salinas, C. J. Solano, Su, H., Sultana, M., Syrotenko, V. S., Valencia, E., Vaughan, N. H., Waldron, A. V., Yaeggy, C. Wret B., Yang, K., and Zazueta, L.
Subjects: High Energy Physics - Experiment
Abstract: Charged-current neutrino interactions with low hadronic recoil ("low-nu") have a cross-section that is approximately constant versus neutrino energy. These interactions have been used to measure the shape of neutrino fluxes as a function of neutrino energy at accelerator-based neutrino experiments such as CCFR, NuTeV, MINOS and MINERvA. In this paper, we demonstrate that low-nu events can be used to measure parameters of neutrino flux and detector models and that utilization of event distributions over the upstream detector face can discriminate among parameters that affect the neutrino flux model. From fitting a large sample of low-nu events obtained by exposing MINERvA to the NuMI medium-energy beam, we find that the best-fit flux parameters are within their a priori uncertainties, but the energy scale of muons reconstructed in the MINOS detector is shifted by 3.6% (or 1.8 times the a priori uncertainty on that parameter). These fit results are now used in all MINERvA cross-section measurements, and this technique can be applied by other experiments operating at MINERvA energies, such as DUNE., Comment: 18 pages, 10 figures, Replaced with accepted version
Published: 2021
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4. Measurement of $\bar{\nu}_{\mu}$ charged-current single $\pi^{-}$ production on hydrocarbon in the few-GeV region using MINERvA

Author: Le, T., Akbar, F., Aliaga, L., Andrade, D. A., Ascencio, M. V., Bashyal, A., Bercellie, A., Betancourt, M., Bodek, A., Bonilla, J. L., Bravar, A., Budd, H., Caceres, G., Cai, T., Carneiro, M. F., Coplowe, D., Dytman, S. A., Díaz, G. A., Felix, 5 J., Fields, L., Filkins, A., Fine, R., Fiza, N., Gago, A. M., Gallagher, H., Ghosh, A., Gran, R., Harris, D. A., Henry, S., Jena, S., Kleykamp, J., Kordosky, M., Last, D., Lu, X. -G., Maher, E., Manly, S., Mann, W. A., Mauger, C., McFarland, K. S., McGowan, A. M., Messerly, B., Miller, J., Morfín, J. G., Naples, D., Nelson, J. K., Nguyen, C., Norrick, A., Nuruzzaman, Olivier, A., Paolone, V., Perdue, G. N., Ramírez, M. A., Ransome, R. D., Ray, H., Rimal, D., Ruterbories, D., Schellman, H., Sobczyk, J. T., Salinas, C. J. Solano, Su, H., Sultana, M., Syrotenko, V. S., Valencia, E., Wospakrik, M., Yaeggy, B., and Zazueta, L.
Subjects: High Energy Physics - Experiment
Abstract: The antineutrino scattering channel $\bar{\nu}_{\mu} \,\text{CH} \rightarrow \mu^{+} \,\pi^{-} \,X$(nucleon(s)) is analyzed in the incident energy range 1.5 to 10 GeV using the MINERvA detector at Fermilab. Differential cross sections are reported as functions of $\mu^{+}$ momentum and production angle, $\pi^{-}$ kinetic energy and production angle, and antineutrino energy and squared four-momentum transfer. Distribution shapes are generally reproduced by simulations based on the GENIE, NuWro, and GiBUU event generators, however GENIE (GiBUU) overestimates (underestimates) the cross-section normalizations by 8% (10%). Comparisons of data with the GENIE-based reference simulation probe conventional treatments of cross sections and pion intranuclear rescattering. The distribution of non-track vertex energy is used to decompose the signal sample into reaction categories, and cross sections are determined for the exclusive reactions $\mu^{+} \pi^{-} n$ and $ \mu^+ \pi^{-} p$. A similar treatment applied to the published MINERvA sample $\bar{\nu}_{\mu} \,\text{CH} \rightarrow \mu^{+} \,\pi^{0} \,X$(nucleon(s)) has determined the $\mu^{+} \pi^{0} n$ cross section, and the latter is used with $\sigma(\pi^{-} n)$ and $\sigma(\pi^{-} p)$ to carry out an isospin decomposition of $\bar{\nu}_{\mu}$-induced CC($\pi$). The ratio of magnitudes and relative phase for isospin amplitudes $A_{3}$ and $A_{1}$ thereby obtained are: $R^{\bar{\nu}} = 0.99 \pm 0.19$ and $\phi^{\bar{\nu}} = 93^{\circ} \pm 7^{\circ}$. Our results are in agreement with bubble chamber measurements made four decades ago., Comment: 22 pages, 17 figures
Published: 2019
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5. Constraint of the MINERvA Medium Energy Neutrino Flux using Neutrino-Electron Elastic Scattering

Author: Valencia, E., Jena, D., Nuruzzaman, Akbar, F., Aliaga, L., Andrade, D. A., Ascencio, M. V., Bashyal, A., Bellantoni, L., Bercellie, A., Bodek, A., Bonilla, J. L., Bravar, A., Budd, H., Caceres, G., Cai, T., Carneiro, M. F., Chaves, J., Coplowe, D., da Motta, H., Dytman, S. A., Diaz, G. A., Felix, J., Fields, L., Filkins, A., Fine, R., Fiza, N., Gago, A. M., Galindo, R., Gallagher, H., Ghosh, A., Golan, T., Gran, R., Harris, D. A., Henry, S., Jena, S., Kleykamp, J., Kordosky, M., Last, D., Le, T., Lu, X. -G., Maher, E., Manly, S., Mann, W. A., Mauger, C., McFarland, K. S., McGowan, A. M., Messerly, B., Miller, J., Morfin, J. G., Naples, D., Nelson, J. K., Nguyen, C., Norrick, A., Olivier, A., Paolone, V., Park, J., Perdue, G. N., Ramirez, M. A., Ransome, R. D., Ray, H., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Salinas, C. J. Solano, Su, H., Sultana, M., Syrotenko, V. S., Yaeggy, B., and Zazueta, L.
Subjects: High Energy Physics - Experiment
Abstract: Elastic neutrino scattering on electrons is a precisely-known purely leptonic process that provides a standard candle for measuring neutrino flux in conventional neutrino beams. Using a total sample of 810 neutino-electron scatters after background subtraction, the measurement reduces the normalization uncertainty on the muon neutrino NuMI flux between 2 and 20 GeV from 7.5% to 3.9%. This is the most precise measurement of neutrino-electron scattering to date, will reduce uncertainties on MINERvA's absolute cross section measurements, and demonstrates a technique that can be used in future neutrino beams such as LBNF., Comment: 12 pages, 12 figures. Final accepted version, including ancillary files with flux data tables. Ancillary data files updated October 2021 to include the neutrino-electron measured event rate and covariance
Published: 2019
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6. High Precision Measurement of Compton Scattering in the 5 GeV region

Author: Ambrozewicz, P., Ye, L., Prok, Y., Larin, I., Ahmidouch, A., Baker, K., Baturin, V., Benton, L., Bernstein, A., Burkert, V., Clinton, E., Cole, P. L., Collins, P., Dale, D., Danagoulian, S., Davidenko, G., Demirchyan, R., Deur, A., Dolgolenko, A., Dutta, D., Dzyubenko, G., Evdokimov, A., Fedotov, G., Feng, J., Gabrielyan, M., Gan, L., Gao, H., Gasparian, A., Gevorkyan, N., Gevorkyan, S., Glamazdin, A., Goryachev, V., Guo, L., Gyurjyan, V., Hardy, K., He, J., Isupov, E., Ito, M., Jiang, L., Kang, H., Kashy, D., Khandaker, M., Kingsberry, P., Klein, F., Kolarkar, A., Konchatnyi, M., Korchin, O., Korsch, W., Kosinov, O., Kowalski, S., Kubantsev, M., Kubarovsky, A., Kubarovsky, V., Lawrence, D., Li, X., Levillain, M., Lu, H., Ma, L., Martel, P., Matveev, V., McNulty, D., Mecking, B., Micherdzinska, A., Milbrath, B., Minehart, R., Miskimen, R., Mochalov, V., Morrison, B., Mtingwa, S., Nakagawa, I., Overby, S., Pasyuk, E., Payen, M., Park, K., Pedroni, R, Phelps, W., Protopopescu, D., Rimal, D., Ritchie, B. G., Romanov, D., Salgado, C, Shahinyan, A., Sitnikov, A, Sober, D., Stepanyan, S., Stephens, W., Tarasov, V., Taylor, S., Teymurazyan, A., Underwood, J., Vasiliev, A., Vishnyakov, V., Weygand, D. P., Wood, M., Zhang, Y., Zhou, S., and Zihlmann, B.
Subjects: Nuclear Experiment, High Energy Physics - Phenomenology, Nuclear Theory
Abstract: The cross section of atomic electron Compton scattering $\gamma + e \rightarrow \gamma^\prime + e^\prime $ was measured in the 4.40--5.475 GeV photon beam energy region by the {\em PrimEx} collaboration at Jefferson Lab with an accuracy of 2\% and less. The results are consistent with theoretical predictions that include next-to-leading order radiative corrections. The measurements provide the first high precision test of this elementary QED process at beam energies greater than 0.1 GeV., Comment: 6 pages, 4 figures
Published: 2019
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7. Tuning the GENIE Pion Production Model with MINERvA Data

Author: Stowell, P., Pickering, L., Wilkinson, C., Wret, C. V. C., Akbar, F., Andrade, D. A., Ascencio, M. V., Bellantoni, L., Bercellie, A., Betancourt, M., Bodek, A., Bravar, A., Budd, H., Caceres, G., Cai, T., Carneiro, M. F., Chaves, J., da Motta, H., Dytman, S. A., Dıaz, G. A., Felix, J., Fields, L., Filkins, A., Fine, R., Fiza, N., Galindo, R., Gallagher, H., Ghosh, A., Gran, R., Harris, D. A., Henry, S., Jena, S., Jena, D., Kleykamp, J., Kordosky, M., Last, D., Le, T., Lu, X. -G., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., McFarland, K. S., Messerly, B., Miller, J., Morfın, J. G., Mousseau, J., Naples, D., Nelson, J. K., Nguyen, C., Norrick, A., Nuruzzaman, Paolone, V., Perdue, G. N., Ramırez, M. A., Ransome, R. D., Ray, H., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Salinas, C. J. Solano, Su, H., Sultana, M., Syrotenko, V. S., Valencia, E., Wolcott, J., Wospakrik, M., Yaeggy, B., Zazueta, L., and Zhang, D.
Subjects: High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract: Faced with unresolved tensions between neutrino interaction measurements at few-GeV neutrino energies, current experiments are forced to accept large systematic uncertainties to cover discrepancies between their data and model predictions. In this paper, the widely used pion production model in GENIE is compared to four MINERvA charged current pion production measurements using NUISANCE. Tunings, ie, adjustments of model parameters, to help match GENIE to MINERvA and older bubble chamber data are presented here. We find that scattering off nuclear targets as measured in MINERvA is not in good agreement with scattering off nucleon (hydrogen or deuterium) targets in the bubble chamber data. An additional ad hoc correction for the low-$Q^2$ region, where collective effects are expected to be large, is also presented. While these tunings and corrections improve the agreement of GENIE with the data, the modeling is imperfect. The development of these tunings within the NUISANCE frameworkallows for straightforward extensions to other neutrino event generators and models, and allows omitting and including new data sets as they become available.
Published: 2019
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8. Neutron measurements from anti-neutrino hydrocarbon reactions

Author: Elkins, M., Cai, T., Chaves, J., Kleykamp, J., Akbar, F., Albin, L., Aliaga, L., Andrade, D. A., Ascencio, M. V., Bashyal, A., Bellantoni, L., Bercellie, A., Betancourt, M., Bodek, A., Bravar, A., Budd, H., Caceres, G., Carneiro, M. F., Coplowe, D., da Motta, H., Dytman, S. A., Díaz, G. A., Felix, J., Fields, L., Filkins, A., Fine, R., Fiza, N., Gago, A. M., Galindo, R., Ghosh, A., Gran, R., Han, J. Y., Harris, D. A., Henry, S., Jena, S., Jena, D., Kordosky, M., Last, D., Le, T., Lovlein, A., Leistico, J., Lopez, A. G., Lu, X. -G., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., Mauger, C., McFarland, K. S., McGowan, A. M., Messerly, B., Miller, J., Morfín, J. G., Mousseau, J., Naples, D., Nelson, J. K., Nguyen, C., Norrick, A., Nuruzzaman, Olivier, A., Paolone, V., Perdue, G. N., Ramírez, M. A., Ransome, R. D., Ray, H., Rimal, D., Ruterbories, D., Schellman, H., Salinas, C. J. Solano, Su, H., Syrotenko, V. S., Valencia, E., Wolcott, J., Wret, C., and Yaeggy, B.
Subjects: High Energy Physics - Experiment
Abstract: Charged-current anti-neutrino interactions on hydrocarbon scintillator in the MINERvA detector are used to study activity from their final-state neutrons. To ensure that most of the neutrons are from the primary interaction, rather than hadronic reinteractions in the detector, the sample is limited to momentum transfers below 0.8 GeV/c. From 16,129 interactions, 15,246 neutral particle candidates are observed. The reference simulation predicts 64\% of these candidates are due to neutrons from the anti-neutrino interaction directly, but also overpredicts the number of candidates by 15\% overall, which is beyond the standard uncertainty estimates for models of neutrino interactions and neutron propagation in the detector. Using the measured distributions for energy deposition, time of flight, position, and speed, we explore the sensitivity to the details those two aspects of the models. We also use multiplicity distributions to evaluate the presence of a two-nucleon knockout process. These results provide critical new information toward a complete description of the hadronic final state of neutrino interactions, which is vital to neutrino oscillation experiments., Comment: 22 pages, 11 figures, synchronized to incorporate journal reviewer's comments
Published: 2019
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9. Measurement of Quasielastic-Like Neutrino Scattering at $\left< E_\nu \right> \sim 3.5$~ GeV on a Hydrocarbon Target

Author: Ruterbories, D., Hurtado, K., Osta, J., Akbar, F., Aliaga, L., Andrade, D. A., Ascencio, M. V., Bashyal, A., Bercellie, A., Betancourt, M., Bodek, A., Budd, H., Caceres, G., Cai, T., Carneiro, M. F., Chaves, J., Coplowe, D., da Motta, H., Dytman, S. A., Díaz, G. A., Felix, J., Fields, L., Filkins, A., Fine, R., Gago, A. M., Galindo, R., Ghosh, A., Gran, R., Han, J. Y., Harris, D. A., Henry, S., Jena, S., Jena, D., Kleykamp, J., Kordosky, M., Last, D., Le, T., Lu, X. -G., Maher, E., Mann, W. A., Mauger, C., McFarland, K. S., McGowan, A. M., Messerly, B., Miller, J., Morfín, J. G., Mousseau, J., Naples, D., Nelson, J. K., Nguyen, C., Norrick, A., Nuruzzaman, Olivier, A., Paolone, V., Patrick, C. E., Perdue, G. N., Ramírez, M. A., Ransome, R. D., Ray, H., Rimal, D., Rodrigues, P. A., Schellman, H., Sobczyk, J. T., Salinas, C. J. Solano, Su, H., Sultana, M., Syrotenko, V. S., Valencia, E., Wolcott, J., Wospakrik, M., Wret, C., Yaeggy, B., and Zazueta, L.
Subjects: High Energy Physics - Experiment
Abstract: MINERvA presents a new analysis of neutrino induced quasielastic-like interactions in a hydrocarbon tracking target. We report a double-differential cross section using the muon transverse and longitudinal momentum. In addition, differential cross sections as a function of the square of the four-momentum transferred and the neutrino energy are calculated using a quasielastic hypothesis. Finally, an analysis of energy deposited near the interaction vertex is presented. These results are compared to modified GENIE predictions as well as a NuWro prediction. All results use a dataset produced by $3.34\times10^{20}$ protons on target creating a neutrino beam with a peak energy of approximately 3.5 GeV, Comment: 38 pages, 47 figures
Published: 2018
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10. Reducing model bias in a deep learning classifier using domain adversarial neural networks in the MINERvA experiment

Author: Perdue, G. N., Ghosh, A., Wospakrik, M., Akbar, F., Andrade, D. A., Ascencio, M., Bellantoni, L., Bercellie, A., Betancourt, M., Vera, G. F. R. Caceres, Cai, T., Carneiro, M. F., Chaves, J., Coplowe, D., da Motta, H., Díaz, G. A., Felix, J., Fields, L., Fine, R., Gago, A. M., Galindo, R., Golan, T., Gran, R., Han, J. Y., Harris, D. A., Jena, D., Kleykamp, J., Kordosky, M., Lu, X. G., Maher, E., Mann, W. A., Marshall, C. M., McFarland, K. S., McGowan, A. M., Messerly, B., Miller, J., Nelson, J. K., Nguyen, C., Norrick, A., Nuruzzaman, Olivier, A., Patton, R., Ramírez, M. A., Ransome, R. D., Ray, H., Ren, L., Rimal, D., Ruterbories, D., Schellman, H., Salinas, C. J. Solano, Su, H., Upadhyay, S., Valencia, E., Wolcott, J., Yaeggy, B., and Young, S.
Subjects: Physics - Data Analysis, Statistics and Probability
Abstract: We present a simulation-based study using deep convolutional neural networks (DCNNs) to identify neutrino interaction vertices in the MINERvA passive targets region, and illustrate the application of domain adversarial neural networks (DANNs) in this context. DANNs are designed to be trained in one domain (simulated data) but tested in a second domain (physics data) and utilize unlabeled data from the second domain so that during training only features which are unable to discriminate between the domains are promoted. MINERvA is a neutrino-nucleus scattering experiment using the NuMI beamline at Fermilab. $A$-dependent cross sections are an important part of the physics program, and these measurements require vertex finding in complicated events. To illustrate the impact of the DANN we used a modified set of simulation in place of physics data during the training of the DANN and then used the label of the modified simulation during the evaluation of the DANN. We find that deep learning based methods offer significant advantages over our prior track-based reconstruction for the task of vertex finding, and that DANNs are able to improve the performance of deep networks by leveraging available unlabeled data and by mitigating network performance degradation rooted in biases in the physics models used for training., Comment: 41 pages
Published: 2018
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11. Measurement of final-state correlations in neutrino muon-proton mesonless production on hydrocarbon at $\langle E_\nu\rangle=3$ GeV

Author: Lu, X. -G., Betancourt, M., Walton, T., Akbar, F., Aliaga, L., Altinok, O., Andrade, D. A., Ascencio, M., Bellantoni, L., Bercellie, A., Bodek, A., Bravar, A., Budd, H., Cai, T., Carneiro, M. F., Chaves, J., Coplowe, D., da Motta, H., Dytman, S. A., Diaz, G. A., Felix, J., Fields, L., Fine, R., Gago, A. M., Galindo, R., Gallagher, H., Ghosh, A., Gran, R., Harris, D. A., Henry, S., Jena, S., Jena, D., Kleykamp, J., Kordosky, M., Le, T., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., McFarland, K. S., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfin, J. G., Mousseau, J., Naples, D., Nelson, J. K., Nguyen, C., Norrick, A., Nuruzzaman, Olivier, A., Paolone, V., Patrick, C. E., Perdue, G. N., Ramirez, M. A., Ransome, R. D., Ren, L., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Sobczyk, J. T., Salinas, C. J. Solano, Su, H., Sultana, M., Valencia, E., Wark, D., Weber, A., Wolcott, J., Wospakrik, M., and Yaeggy, B.
Subjects: High Energy Physics - Experiment
Abstract: Final-state kinematic imbalances are measured in mesonless production of $\nu_\mu + A \to \mu^- + p + X$ in the MINERvA tracker. Initial- and final-state nuclear effects are probed using the direction of the $\mu^-$-p transverse momentum imbalance and the initial-state momentum of the struck neutron. Differential cross sections are compared to predictions based on current approaches to medium modeling. These models under-predict the cross section at intermediate intranuclear momentum transfers that generally exceed the Fermi momenta. As neutrino interaction models need to correctly incorporate the effect of the nucleus in order to predict neutrino energy resolution in oscillation experiments, this result points to a region of phase space where additional cross section strength is needed in current models, and demonstrates a new technique that would be suitable for use in fine grained liquid argon detectors where the effect of the nucleus may be even larger., Comment: 6 pages, 6 figures, accepted by PRL, data release package updated
Published: 2018
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12. COHERENT Collaboration data release from the first observation of coherent elastic neutrino-nucleus scattering

Author: COHERENT Collaboration, Akimov, D., Albert, J. B., An, P., Awe, C., Barbeau, P. S., Becker, B., Belov, V., Blackston, M. A., Bolozdynya, A., Brown, A., Burenkov, A., Cabrera-Palmer, B., Cervantes, M., Collar, J. I., Cooper, R. J., Cooper, R. L., Cuesta, C., Daughhetee, J., Dean, D. J., Coello, M. del Valle, Detwiler, J., D'Onofrio, M., Eberhardt, A., Efremenko, Y., Elliott, S. R., Etenko, A., Fabris, L., Febbraro, M., Fields, N., Fox, W., Fu, Z., Galindo-Uribarri, A., Green, M. P., Hai, M., Heath, M. R., Hedges, S., Hornback, D., Hossbach, T. W., Iverson, E. B., Kaemingk, M., Kaufman, L. J., Klein, S. R., Khromov, A., Ki, S., Konovalov, A., Kovalenko, A., Kremer, M., Kumpan, A., Leadbetter, C., Li, L., Lu, W., Mann, K., Markoff, D. M., Melikyan, Y., Miller, K., Moreno, H., Mueller, P. E., Naumov, P., Newby, J., Orrell, J. L., Overman, C. T., Parno, D. S., Penttila, S., Perumpilly, G., Radford, D. C., Rapp, R., Ray, H., Raybern, J., Reyna, D., Rich, G. C., Rimal, D., Rudik, D., Salvat, D. J., Scholberg, K., Scholz, B., Sinev, G., Snow, W. M., Sosnovtsev, V., Shakirov, A., Suchyta, S., Suh, B., Tayloe, R., Thornton, R. T., Tolstukhin, I., Vanderwerp, J., Varner, R. L., Virtue, C. J., Wan, Z., Yoo, J., Yu, C. -H., Zawada, A., Zderic, A., and Zettlemoyer, J.
Subjects: Nuclear Experiment, High Energy Physics - Experiment
Abstract: This release includes data and information necessary to perform independent analyses of the COHERENT result presented in Akimov et al., arXiv:1708.01294 [nucl-ex]. Data is shared in a binned, text-based format, including both "signal" and "background" regions, so that counts and associated uncertainties can be quantitatively calculated for the purpose of separate analyses. This document describes the included information and its format, offering some guidance on use of the data. Accompanying code examples show basic interaction with the data using Python.
Published: 2018
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13. Antineutrino Charged-Current reactions on Hydrocarbon with Low Momentum Transfer

Author: Gran, R., Betancourt, M., Elkins, M., Rodrigues, P. A., Akbar, F., Aliaga, L., Andrade, D. A., Bashyal, A., Bellantoni, L., Bercellie, A., Bodek, A., Bravar, A., Budd, H., Vera, G. F. R. Caceres, Cai, T., Carneiro, M. F., Coplowe, D., da Motta, H., Dytman, S. A., Diaz, G. A., Felix, J., Fields, L., Fine, R., Gallagher, H., Ghosh, A., Haider, H., Han, J. Y., Harris, D. A., Henry, S., Jena, D., Kleykamp, J., Kordosky, M., Le, T., Leistico, J. R., Lovlein, A., Lu, X. -G., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., McFarland, K. S., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfin, J. G., Mousseau, J., Naples, D., Nelson, J. K., Nguyen, C., Norrick, A., Nuruzzaman, Olivier, A., Paolone, V., Patrick, C. E., Perdue, G. N., Ramirez, M. A., Ransome, R. D., Ray, H., Ren, L., Rimal, D., Ruterbories, D., Schellman, H., Salinas, C. J. Solano, Su, H., Sultana, M., Falero, S. Sanchez, Valencia, E., Wolcott, J., Wospakrik, M., and Yaeggy, B.
Subjects: High Energy Physics - Experiment
Abstract: We report on multinucleon effects in low momentum transfer ($< 0.8$ GeV/c) anti-neutrino interactions on plastic (CH) scintillator. These data are from the 2010-2011 antineutrino phase of the MINERvA experiment at Fermilab. The hadronic energy spectrum of this inclusive sample is well described when a screening effect at low energy transfer and a two-nucleon knockout process are added to a relativistic Fermi gas model of quasielastic, $\Delta$ resonance, and higher resonance processes. In this analysis, model elements introduced to describe previously published neutrino results have quantitatively similar benefits for this antineutrino sample. We present the results as a double-differential cross section to accelerate investigation of alternate models for antineutrino scattering off nuclei., Comment: 7 pages, 4 figures. Updated to synchronize with reviewers and proofs recommendations and add supplemental cross section data file
Published: 2018
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14. COHERENT 2018 at the Spallation Neutron Source

Author: Akimov, D., Albert, J. B., An, P., Awe, C., Barbeau, P. S., Becker, B., Belov, V., Blackston, M. A., Bolozdynya, A., Brown, A., Burenkov, A., Cabrera-Palmer, B., Cervantes, M., Collar, J. I., Cooper, R. J., Cooper, R. L., Daughhetee, J., Dean, D. J., Coello, M. del Valle, Detwiler, J. A., D'Onofrio, M., Efremenko, Y., Elliott, S. R., Erkela, E., Etenko, A., Fabris, L., Febbraro, M., Fields, N., Fox, W., Galindo-Uribarri, A., Green, M. P., Heath, M. R., Hedges, S., Iverson, E. B., Kaemingk, M., Kaufman, L. J., Klein, S. R., Khromov, A., Ki, S., Konovalov, A., Kovalenko, A., Kumpan, A., Li, L., Lu, W., Mann, K., Melikyan, Y., Markoff, D. M., Moreno, H., Mueller, P. E., Naumov, P., Newby, J., Parno, D. S., Penttila, S., Perumpilly, G., Radford, D., Rapp, R., Ray, H., Raybern, J., Reyna, D., Rich, G. C., Rimal, D., Rudik, D., Salvat, D. J., Scholberg, K., Scholz, B., Sinev, G., Snow, W. M., Sosnovtsev, V., Shakirov, A., Suh, B., Tayloe, R., Thornton, R. T., Tolstukhin, I., Vanderwerp, J., Varner, R. L., Virtue, C. J., Yoo, J., Yu, C. -H., and Zettlemoyer, J.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract: The primary goal of the COHERENT collaboration is to measure and study coherent elastic neutrino-nucleus scattering (CEvNS) using the high-power, few-tens-of-MeV, pulsed source of neutrinos provided by the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). The COHERENT collaboration reported the first detection of CEvNS [Akimov:2017ade] using a CsI[Na] detector. At present the collaboration is deploying four detector technologies: a CsI[Na] scintillating crystal, p-type point-contact germanium detectors, single-phase liquid argon, and NaI[Tl] crystals. All detectors are located in the neutron-quiet basement of the SNS target building at distances 20-30 m from the SNS neutrino source. The simultaneous measurement in all four COHERENT detector subsystems will test the $N^2$ dependence of the cross section and search for new physics. In addition, COHERENT is measuring neutrino-induced neutrons from charged- and neutral-current neutrino interactions on nuclei in shielding materials, which represent a non-negligible background for CEvNS as well as being of intrinsic interest. The Collaboration is planning as well to look for charged-current interactions of relevance to supernova and weak-interaction physics. This document describes concisely the COHERENT physics motivations, sensitivity, and next plans for measurements at the SNS to be accomplished on a few-year timescale., Comment: 22 pages, 14 figures
Published: 2018

15. Tuning the genie pion production model with MINERvA data

Author: Stowell, P, Pickering, L, Wilkinson, C, Wret, C, Akbar, F, Andrade, DA, Ascencio, MV, Bellantoni, L, Bercellie, A, Betancourt, M, Bodek, A, Bravar, A, Budd, H, Caceres, G, Cai, T, Carneiro, MF, Chaves, J, da Motta, H, Dytman, SA, Díaz, GA, Felix, J, Fields, L, Filkins, A, Fine, R, Fiza, N, Galindo, R, Gallagher, H, Ghosh, A, Gran, R, Harris, DA, Henry, S, Jena, S, Jena, D, Kleykamp, J, Kordosky, M, Last, D, Le, T, Lu, X-G, Maher, E, Manly, S, Mann, WA, Marshall, CM, McFarland, KS, Messerly, B, Miller, J, Morfín, JG, Mousseau, J, Naples, D, Nelson, JK, Nguyen, C, Norrick, A, Nuruzzaman, Paolone, V, Perdue, GN, Ramírez, MA, Ransome, RD, Ray, H, Rimal, D, Rodrigues, PA, Ruterbories, D, Schellman, H, Salinas, CJ Solano, Su, H, Sultana, M, Syrotenko, VS, Valencia, E, Wolcott, J, Wospakrik, M, Yaeggy, B, Zazueta, L, and Zhang, D
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, Bioengineering, hep-ex, hep-ph
Abstract: Faced with unresolved tensions between neutrino interaction measurements atfew-GeV neutrino energies, current experiments are forced to accept largesystematic uncertainties to cover discrepancies between their data and modelpredictions. In this paper, the widely used pion production model in GENIE iscompared to four MINERvA charged current pion production measurements usingNUISANCE. Tunings, ie, adjustments of model parameters, to help match GENIE toMINERvA and older bubble chamber data are presented here. We find thatscattering off nuclear targets as measured in MINERvA is not in good agreementwith scattering off nucleon (hydrogen or deuterium) targets in the bubblechamber data. An additional ad hoc correction for the low-$Q^2$ region, wherecollective effects are expected to be large, is also presented. While thesetunings and corrections improve the agreement of GENIE with the data, themodeling is imperfect. The development of these tunings within the NUISANCEframeworkallows for straightforward extensions to other neutrino eventgenerators and models, and allows omitting and including new data sets as theybecome available.
Published: 2019

16. Measurement of Total and Differential Cross Sections of Neutrino and Antineutrino Coherent $\pi^\pm$ Production on Carbon

Author: MINERvA Collaboration, Mislivec, A., Higuera, A., Aliaga, L., Bellantoni, L., Bercellie, A., Betancourt, M., Bodek, A., Bravar, A., Budd, H., Caceres, G. F. R. V., Cai, T., Caicedo, D. A. Martinez, Carneiro, M. F., Chavarria, E., da Motta, H., Dytman, S. A., Diaz, G. A., Felix, J., Fields, L., Fine, R., Gago, A. M., Galindo, R., Gallagher, H., Ghosh, A., Gran, R., Harris, D. A., Hurtado, K., Jena, D., Kleykamp, J., Kordosky, M., Le, T., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., McFarland, K. S., Messerly, B., Miller, J., Morfin, J. G., Mousseau, J., Naples, D., Nelson, J. K., Nguyen, C., Norrick, A., Nuruzzaman, Paolone, V., Perdue, G. N., Ramirez, M. A., Ransome, R. D., Ray, H., Ren, L., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Salinas, C. J. Solano, Sultana, M., Falero, S. Sanchez, Tagg, N., Valencia, E., Wospakrik, M., Yaeggy, B., and Zavala, G.
Subjects: High Energy Physics - Experiment
Abstract: Neutrino induced coherent charged pion production on nuclei, $\overline{\nu}_\mu A\to\mu^\pm\pi^\mp A$, is a rare inelastic interaction in which the four-momentum squared transfered to the nucleus is nearly zero, leaving it intact. We identify such events in the scintillator of MINERvA by reconstructing |t| from the final state pion and muon momenta and by removing events with evidence of energetic nuclear recoil or production of other final state particles. We measure the total neutrino and antineutrino cross sections as a function of neutrino energy between 2 and 20 GeV and measure flux integrated differential cross sections as a function of $Q^2$, $E_\pi$ and $\theta_\pi$. The $Q^2$ dependence and equality of the neutrino and anti-neutrino cross-sections at finite $Q^2$ provide a confirmation of Adler's PCAC hypothesis.
Published: 2017
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17. Measurement of $\nu_{\mu}$ charged-current single $\pi^{0}$ production on hydrocarbon in the few-GeV region using MINERvA

Author: Altinok, O., Le, T., Aliaga, L., Bellantoni, L., Bercellie, A., Betancourt, M., Bodek, A., Bravar, A., Budd, H., Vera, G. F. R. Caceres, Cai, T., Carneiro, M. F., da Motta, H., Dytman, S. A., Díaz, G. A., Felix, J., Fields, L., Fine, R., Gago, A. M., Galindo, R., Gallagher, H., Ghosh, A., Gran, R., Han, J. Y., Harris, D. A., Kleykamp, J., Kordosky, M., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., Caicedo, D. A. Martinez, McFarland, K. S., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfín, J. G., Naples, D., Nelson, J. K., Norrick, A., Nuruzzaman, Paolone, V., Patrick, C. E., Perdue, G. N., Ramirez, M. A., Ransome, R. D., Ray, H., Ren, L., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Sobczyk, J. T., Salinas, C. J. Solano, Sultana, M., Falero, S. Sánchez, Valencia, E., Wolcott, J., and Yaeggy, B.
Subjects: High Energy Physics - Experiment
Abstract: The semi-exclusive channel $\nu_{\mu}+\textrm{CH}\rightarrow\mu^{-}\pi^{0}+\textrm{nucleon(s)}$ is analyzed using MINERvA exposed to the low-energy NuMI $\nu_{\mu}$ beam with spectral peak at $E_{\nu} \simeq 3$ GeV. Differential cross sections for muon momentum and production angle, $\pi^{0}$ kinetic energy and production angle, and for squared four-momentum transfer are reported, and the cross section $\sigma(E_{\nu})$ is obtained over the range 1.5 GeV $\leq E_{\nu} <$ 20 GeV. Results are compared to GENIE and NuWro predictions and to published MINERvA cross sections for $\nu_{\mu}\textrm{-CC}(\pi^{+})$ and $\bar{\nu}_{\mu}\textrm{-CC}(\pi^{0})$. Disagreements between data and simulation are observed at very low and relatively high values for muon angle and for $Q^2$ that may reflect shortfalls in modeling of interactions on carbon. For $\pi^{0}$ kinematic distributions however, the data are consistent with the simulation and provide support for generator treatments of pion intranuclear scattering. Using signal-event subsamples that have reconstructed protons as well as $\pi^{0}$ mesons, the $p\pi^{0}$ invariant mass distribution is obtained, and the decay polar and azimuthal angle distributions in the rest frame of the $p\pi^{0}$ system are measured in the region of $\Delta(1232)^+$ production, $W < 1.4$ GeV., Comment: 19 pages, 22 figures
Published: 2017
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18. Observation of Coherent Elastic Neutrino-Nucleus Scattering

Author: Akimov, D., Albert, J. B., An, P., Awe, C., Barbeau, P. S., Becker, B., Belov, V., Brown, A., Bolozdynya, A., Cabrera-Palmer, B., Cervantes, M., Collar, J. I., Cooper, R. J., Cooper, R. L., Cuesta, C., Dean, D. J., Detwiler, J. A., Eberhardt, A., Efremenko, Y., Elliott, S. R., Erkela, E. M., Fabris, L., Febbraro, M., Fields, N. E., Fox, W., Fu, Z., Galindo-Uribarri, A., Green, M. P., Hai, M., Heath, M. R., Hedges, S., Hornback, D., Hossbach, T. W., Iverson, E. B., Kaufman, L. J., Ki, S., Klein, S. R., Khromov, A., Konovalov, A., Kremer, M., Kumpan, A., Leadbetter, C., Li, L., Lu, W., Mann, K., Markoff, D. M., Miller, K., Moreno, H., Mueller, P. E., Newby, J., Orrell, J. L., Overman, C. T., Parno, D. S., Penttila, S., Perumpilly, G., Ray, H., Raybern, J., Reyna, D., Rich, G. C., Rimal, D., Rudik, D., Scholberg, K., Scholz, B. J., Sinev, G., Snow, W. M., Sosnovtsev, V., Shakirov, A., Suchyta, S., Suh, B., Tayloe, R., Thornton, R. T., Tolstukhin, I., Vanderwerp, J., Varner, R. L., Virtue, C. J., Wan, Z., Yoo, J., Yu, C. -H., Zawada, A., Zettlemoyer, J., and Zderic, A. M.
Subjects: Nuclear Experiment, High Energy Physics - Experiment, High Energy Physics - Phenomenology, Nuclear Theory
Abstract: The coherent elastic scattering of neutrinos off nuclei has eluded detection for four decades, even though its predicted cross-section is the largest by far of all low-energy neutrino couplings. This mode of interaction provides new opportunities to study neutrino properties, and leads to a miniaturization of detector size, with potential technological applications. We observe this process at a 6.7-sigma confidence level, using a low-background, 14.6-kg CsI[Na] scintillator exposed to the neutrino emissions from the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. Characteristic signatures in energy and time, predicted by the Standard Model for this process, are observed in high signal-to-background conditions. Improved constraints on non-standard neutrino interactions with quarks are derived from this initial dataset.
Published: 2017
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19. Direct Measurement of Nuclear Dependence of Charged Current Quasielastic-like Neutrino Interactions using MINERvA

Author: Betancourt, M., Ghosh, A., Walton, T., Altinok, O., Bellantoni, L., Bercellie, A., Bodek, A., Bravar, A., Cai, T., Caicedo, D. A. Martinez, Carneiro, M. F., Dytman, S. A., Dıaz, G. A., Felix, J., Fields, L., Fine, R., Galindo, R., Gallagher, H., Golan, T., Gran, R., Harris, D. A., Higuera, A., Hurtado, K., Kiveni, M., Kleykamp, J., Le, T., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., McFarland, K. S., McGivern, C. L., McGowan, A. M., Messerly, B., Miller, J., Morfın, J. G., Mousseau, J., Naples, D., Nelson, J. K., Norrick, A., Nuruzzaman, Patrick, C. E., Perdue, G. N., Ramırez, M. A., Ren, L., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Sobczyk, J. T., Salinas, C. J. Solano, Falero, S. Sanchez, Valencia, E., Wolcott, J., Wospakrik, M., and Yaeggy, B.
Subjects: High Energy Physics - Experiment
Abstract: Charged-current $\nu_{\mu}$ interactions on carbon, iron, and lead with a final state hadronic system of one or more protons with zero mesons are used to investigate the influence of the nuclear environment on quasielastic-like interactions. The transfered four-momentum squared to the target nucleus, $Q^2$, is reconstructed based on the kinematics of the leading proton, and differential cross sections versus $Q^2$ and the cross-section ratios of iron, lead and carbon to scintillator are measured for the first time in a single experiment. The measurements show a dependence on atomic number. While the quasielastic-like scattering on carbon is compatible with predictions, the trends exhibited by scattering on iron and lead favor a prediction with intranuclear rescattering of hadrons accounted for by a conventional particle cascade treatment. These measurements help discriminate between different models of both initial state nucleons and final state interactions used in the neutrino oscillation experiments.
Published: 2017
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20. Measurement of the antineutrino to neutrino charged-current interaction cross section ratio in MINERvA

Author: Minerva Collaboration, Ren, L., Aliaga, L., Altinok, O., Bellantoni, L., Bercellie, A., Betancourt, M., Bodek, A., Bravar, A., Budd, H., Cai, T., Carneiro, M. F., da Motta, H., Dytman, S. A., Diaz, G. A., Eberly, B., Endress, E., Felix, J., Fields, L., Fine, R., Gago, A. M., Galindo, R., Gallagher, H., Ghosh, A., Golan, T., Gran, R., Han, J. Y., Harris, D. A., Hurtado, K., Kiveni, M., Kleykamp, J., Kordosky, M., Le, T., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., Caicedo, D. A. Martinez, McFarland, K. S., McGivern, C. L., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfin, J. G., Mousseau, J., Naples, D., Nelson, J. K., Norrick, A., Nuruzzaman, Paolone, V., Park, J., Patrick, C. E., Perdue, G. N., Ramirez, M. A., Ransome, R. D., Ray, H., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Salinas, C. J. Solano, Sultana, M., Falero, S. Sanchez, Valencia, E., Walton, T., Wolcott, J., Wospakrik, M., and Yaeggy, B.
Subjects: High Energy Physics - Experiment
Abstract: We present measurements of the neutrino and antineutrino total charged-current cross sections on carbon and their ratio using the MINERvA scintillator-tracker. The measurements span the energy range 2-22 GeV and were performed using forward and reversed horn focusing modes of the Fermilab low-energy NuMI beam to obtain large neutrino and antineutrino samples. The flux is obtained using a sub-sample of charged-current events at low hadronic energy transfer along with precise higher energy external neutrino cross section data overlapping with our energy range between 12-22 GeV. We also report on the antineutrino-neutrino cross section ratio, Rcc, which does not rely on external normalization information. Our ratio measurement, obtained within the same experiment using the same technique, benefits from the cancellation of common sample systematic uncertainties and reaches a precision of 5% at low energy. Our results for the antineutrino-nucleus scattering cross section and for Rcc are the most precise to date in the energy range $E_{\nu} <$ 6GeV.
Published: 2017
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21. Measurement of Final-State Correlations in Neutrino Muon-Proton Mesonless Production on Hydrocarbon at ⟨Eν⟩=3 GeV

Author: Lu, X-G, Betancourt, M, Walton, T, Akbar, F, Aliaga, L, Altinok, O, Andrade, DA, Ascencio, M, Bellantoni, L, Bercellie, A, Bodek, A, Bravar, A, Budd, H, Cai, T, Carneiro, MF, Chaves, J, Coplowe, D, da Motta, H, Dytman, SA, Díaz, GA, Felix, J, Fields, L, Fine, R, Gago, AM, Galindo, R, Gallagher, H, Ghosh, A, Gran, R, Harris, DA, Henry, S, Jena, S, Jena, D, Kleykamp, J, Kordosky, M, Le, T, Maher, E, Manly, S, Mann, WA, Marshall, CM, McFarland, KS, McGowan, AM, Messerly, B, Miller, J, Mislivec, A, Morfín, JG, Mousseau, J, Naples, D, Nelson, JK, Nguyen, C, Norrick, A, Nuruzzaman, Olivier, A, Paolone, V, Patrick, CE, Perdue, GN, Ramírez, MA, Ransome, RD, Ren, L, Rimal, D, Rodrigues, PA, Ruterbories, D, Schellman, H, Sobczyk, JT, Salinas, CJ Solano, Su, H, Sultana, M, Valencia, E, Wark, D, Weber, A, Wolcott, J, Wospakrik, M, and Yaeggy, B
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, MINERvA Collaboration, hep-ex, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract: Final-state kinematic imbalances are measured in mesonless production of ν_{μ}+A→μ^{-}+p+X in the MINERvA tracker. Initial- and final-state nuclear effects are probed using the direction of the μ^{-}-p transverse momentum imbalance and the initial-state momentum of the struck neutron. Differential cross sections are compared to predictions based on current approaches to medium modeling. These models underpredict the cross section at intermediate intranuclear momentum transfers that generally exceed the Fermi momenta. As neutrino interaction models need to correctly incorporate the effect of the nucleus in order to predict neutrino energy resolution in oscillation experiments, this result points to a region of phase space where additional cross section strength is needed in current models, and demonstrates a new technique that would be suitable for use in fine-grained liquid argon detectors where the effect of the nucleus may be even larger.
Published: 2018

22. Measurement of total and differential cross sections of neutrino and antineutrino coherent π± production on carbon

Author: Mislivec, A, Higuera, A, Aliaga, L, Bellantoni, L, Bercellie, A, Betancourt, M, Bodek, A, Bravar, A, Budd, H, Caceres V., GFR, Cai, T, Martinez Caicedo, DA, Carneiro, MF, Chavarria, E, da Motta, H, Dytman, SA, Díaz, GA, Felix, J, Fields, L, Fine, R, Gago, AM, Galindo, R, Gallagher, H, Ghosh, A, Gran, R, Harris, DA, Hurtado, K, Jena, D, Kleykamp, J, Kordosky, M, Le, T, Maher, E, Manly, S, Mann, WA, Marshall, CM, McFarland, KS, Messerly, B, Miller, J, Morfín, JG, Mousseau, J, Naples, D, Nelson, JK, Nguyen, C, Norrick, A, Nuruzzaman, Paolone, V, Perdue, GN, Ramírez, MA, Ransome, RD, Ray, H, Ren, L, Rimal, D, Rodrigues, PA, Ruterbories, D, Schellman, H, Solano Salinas, CJ, Sultana, M, Sánchez Falero, S, Tagg, N, Valencia, E, Wospakrik, M, Yaeggy, B, and Zavala, G
Subjects: hep-ex
Abstract: Neutrino induced coherent charged pion production on nuclei,$\overline{\nu}_\mu A\to\mu^\pm\pi^\mp A$, is a rare inelastic interaction inwhich the four-momentum squared transfered to the nucleus is nearly zero,leaving it intact. We identify such events in the scintillator of MINERvA byreconstructing |t| from the final state pion and muon momenta and by removingevents with evidence of energetic nuclear recoil or production of other finalstate particles. We measure the total neutrino and antineutrino cross sectionsas a function of neutrino energy between 2 and 20 GeV and measure fluxintegrated differential cross sections as a function of $Q^2$, $E_\pi$ and$\theta_\pi$. The $Q^2$ dependence and equality of the neutrino andanti-neutrino cross-sections at finite $Q^2$ provide a confirmation of Adler'sPCAC hypothesis.
Published: 2018

23. Measurement of neutral-current $K^+$ production by neutrinos using MINERvA

Author: Marshall, C. M., Aliaga, L., Altinok, O., Bellantoni, L., Bercellie, A., Betancourt, M., Bodek, A., Bravar, A., Cai, T., Carneiro, M. F., da Motta, H., Dytman, S. A., Dìaz, G. A., Dunkman, M., Eberly, B., Endress, E., Felix, J., Fields, L., Fine, R., Gago, A. M., Galindo, R., Gallagher, H., Ghosh, A., Golan, T., Gran, R., Harris, D. A., Higuera, A., Hurtado, K., Kleykamp, J., Kordosky, M., Le, T., Maher, E., Manly, S., Mann, W. A., Caicedo, D. A. Martinez, McFarland, K. S., McGivern, C. L., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfìn, J. G., Mousseau, J., Naples, D., Nelson, J. K., Norrick, A., Nuruzzaman, Paolone, V., Patrick, C. E., Perdue, G. N., Ramìrez, M. A., Ransome, R. D., Ray, H., Ren, L., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schmitz, D. W., Salinas, C. J. Solano, Sultana, M., Falero, S. Sànchez, Valencia, E., Walton, T., Wolcott, J., Wospakrik, M., Yaeggy, B., and Zhang, D.
Subjects: High Energy Physics - Experiment
Abstract: Neutral-current production of $K^{+}$ by atmospheric neutrinos is a background in searches for the proton decay $p \rightarrow K^{+} \bar{\nu}$. Reactions such as $\nu p \rightarrow \nu K^{+} \Lambda$ are indistinguishable from proton decays when the decay products of the $\Lambda$ are below detection threshold. Events with $K^{+}$ are identified in MINERvA by reconstructing the timing signature of a $K^{+}$ decay at rest. A sample of 201 neutrino-induced neutral-current $K^{+}$ events is used to measure differential cross sections with respect to the $K^{+}$ kinetic energy, and the non-$K^{+}$ hadronic visible energy. An excess of events at low hadronic visible energy is observed relative to the prediction of the NEUT event generator. Good agreement is observed with the cross section prediction of the GENIE generator. A search for photons from $\pi^{0}$ decay, which would veto a neutral-current $K^{+}$ event in a proton decay search, is performed, and a 2$\sigma$ deficit of detached photons is observed relative to the GENIE prediction.
Published: 2016
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24. Measurements of the Inclusive Neutrino and Antineutrino Charged Current Cross Sections in MINERvA Using the Low-$\nu$ Flux Method

Author: MINERvA Collaboration, DeVan, J., Ren, L., Aliaga, L., Altinok, O., Bellantoni, L., Bercellie, A., Betancourt, M., Bodek, A., Budd, H., Cai, T., Carneiro, M. F., da Motta, H., Devan, J., Dytman, S. A., Díaz, G. A., Eberly, B., Endress, E., Felix, J., Fields, L., Fine, R., Gago, A. M., Galindo, R., Gallagher, H., Ghosh, A., Gran, R., Harris, D. A., Higuera, A., Hurtado, K., Kleykamp, J., Kordosky, M., Le, T., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., Caicedo, D. A. Martinez, McFarland, K. S., McGivern, C. L., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfín, J. G., Mousseau, J., Naples, D., Nelson, J. K., Norrick, A., Nuruzzaman, Paolone, V., Park, J., Patrick, C. E., Perdue, G. N., Ramirez, M. A., Ransome, R. D., Ray, H., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Salinas, C. J. Solano, Sultana, M., Falero, S. Sánchez, Tice, B. G., Valencia, E., Wolcott, J., Wospakrik, M., and Zhang, D.
Subjects: High Energy Physics - Experiment
Abstract: The total cross sections are important ingredients for the current and future neutrino oscillation experiments. We present measurements of the total charged-current neutrino and antineutrino cross sections on scintillator (CH) in the NuMI low-energy beamline using an {\em in situ} prediction of the shape of the flux as a function of neutrino energy from 2--50 GeV. This flux prediction takes advantage of the fact that neutrino and antineutrino interactions with low nuclear recoil energy ($\nu$) have a nearly constant cross section as a function of incident neutrino energy. This measurement is the lowest energy application of the low-$\nu$ flux technique, the first time it has been used in the NuMI antineutrino beam configuration, and demonstrates that the technique is applicable to future neutrino beams operating at multi-GeV energies. The cross section measurements presented are the most precise measurements to date below 5 GeV., Comment: 8 pages, 6 figures, and 12 supplemental tables of fluxes, cross sections, breakdowns of their uncertainties, and their covariance matrices
Published: 2016
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25. Neutrino Flux Predictions for the NuMI Beam

Author: MINERvA Collaboration, Aliaga, L., Kordosky, M., Golan, T., Altinok, O., Bellantoni, L., Bercellie, A., Betancourt, M., Bravar, A., Budd, H., Carneiro, M. F., Diaz, G. A., Endress, E., Felix, J., Fields, L., Fine, R., Gago, A. M., Galindo, R., Gallagher, H., Gran, R., Harris, D. A., Higuera, A., Hurtado, K., Kiveni, M., Kleykamp, J., Le, T., Maher, E., Mann, W. A., Marshall, C. M., Caicedo, D. A. Martinez, McFarland, K. S., McGivern, C. L., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfin, J. G., Mousseau, J., Naples, D., Nelson, J. K., Norrick, A., Nuruzzaman, Paolone, V., Park, J., Patrick, C. E., Perdue, G. N., Ransome, R. D., Ray, H., Ren, L., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Salinas, C. J. Solano, Falero, S. Sanchez, Tice, B. G., Valencia, E., Walton, T., Wolcott, J., Wospakrik, M., and Zhang, D.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: Knowledge of the neutrino flux produced by the Neutrinos at the Main Injector (NuMI) beamline is essential to the neutrino oscillation and neutrino interaction measurements of the MINERvA, MINOS+, NOvA and MicroBooNE experiments at Fermi National Accelerator Laboratory. We have produced a flux prediction which uses all available and relevant hadron production data, incorporating measurements of particle production off of thin targets as well as measurements of particle yields from a spare NuMI target exposed to a 120 GeV proton beam. The result is the most precise flux prediction achieved for a neutrino beam in the one to tens of GeV energy region. We have also compared the prediction to in situ measurements of the neutrino flux and find good agreement., Comment: v2 includes supplemental material consisting of the flux prediction and uncertainties in ascii and root format, a program to read the ascii datafiles, and a short guide with additional details. v3 fixes a couple of typographical errors on the units for some quantities in the beam focusing section
Published: 2016
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26. First evidence of coherent $K^{+}$ meson production in neutrino-nucleus scattering

Author: Wang, Z., Marshall, C. M., Aliaga, L., Altinok, O., Bellantoni, L., Bercellie, A., Betancourt, M., Bodek, A., Bravar, A., Budd, H., Cai, T., Carneiro, M. F., da Motta, H., Dytman, S. A., Dìaz, G. A., Eberly, B., Endress, E., Felix, J., Fields, L., Fine, R., Galindo, R., Gallagher, H., Ghosh, A., Golan, T., Gran, R., Harris, D. A., Higuera, A., Hurtado, K., Kiveni, M., Kleykamp, J., Kordosky, M., Le, T., Maher, E., Manly, S., Mann, W. A., Caicedo, D. A. Martinez, McFarland, K. S., McGivern, C. L., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfìn, J. G., Mousseau, J., Naples, D., Nelson, J. K., Norrick, A., Nuruzzaman, Paolone, V., Park, J., Patrick, C. E., Perdue, G. N., Rakotondravohitra, L., Ramirez, M. A., Ransome, R. D., Ray, H., Ren, L., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Schmitz, D. W., Simon, C., Salinas, C. J. Solano, Tice, B. G., Valencia, E., Walton, T., Wolcott, J., Wospakrik, M., Zavala, G., and Zhang, D.
Subjects: High Energy Physics - Experiment
Abstract: Neutrino-induced charged-current coherent kaon production, $\nu_{\mu}A\rightarrow\mu^{-}K^{+}A$, is a rare, inelastic electroweak process that brings a $K^+$ on shell and leaves the target nucleus intact in its ground state. This process is significantly lower in rate than neutrino-induced charged-current coherent pion production, because of Cabibbo suppression and a kinematic suppression due to the larger kaon mass. We search for such events in the scintillator tracker of MINERvA by observing the final state $K^+$, $\mu^-$ and no other detector activity, and by using the kinematics of the final state particles to reconstruct the small momentum transfer to the nucleus, which is a model-independent characteristic of coherent scattering. We find the first experimental evidence for the process at $3\sigma$ significance., Comment: added ancillary file with information about the six kaon candidates
Published: 2016
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27. Cross sections for neutrino and antineutrino induced pion production on hydrocarbon in the few-GeV region using MINERvA

Author: McGivern, C. L., Le, T., Eberly, B., Aliaga, L., Altinok, O., Bellantoni, L., Bercellie, A., Betancourt, M., Bodek, A., Bravar, A., Budd, H., Cai, T., Carneiro, M. F., Christy, M. E., da Motta, H., Dytman, S. A., Diaz, G. A., Endress, E., Felix, J., Fields, L., Fine, R., Galindo, R., Gallagher, H., Golan, T., Gran, R., Harris, D. A., Higuera, A., Hurtado, K., Kiveni, M., Kleykamp, J., Kordosky, M., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., Caicedo, D. A. Martinez, McFarland, K. S., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfin, J. G., Mousseau, J., Naples, D., Nelson, J. K., Norrick, A., Nuruzzaman, Paolone, V., Park, J., Patrick, C. E., Perdue, G. N., Rakotondravohitra, L., Ramirez, M. A., Ransome, R. D., Ray, H., Ren, L., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Schmitz, D. W., Simon, C., Salinas, C. J. Solano, Falero, S. Sanchez, Tice, B. G., Valencia, E., Walton, T., Wolcott, J., Wospakrik, M., and Zhang, D.
Subjects: High Energy Physics - Experiment
Abstract: Separate samples of charged-current pion production events representing two semi-inclusive channels $\nu_\mu$-CC($\pi^{+}$) and $\bar{\nu}_{\mu}$-CC($\pi^{0}$) have been obtained using neutrino and antineutrino exposures of the MINERvA detector. Distributions in kinematic variables based upon $\mu^{\pm}$-track reconstructions are analyzed and compared for the two samples. The differential cross sections for muon production angle, muon momentum, and four-momentum transfer $Q^2$, are reported, and cross sections versus neutrino energy are obtained. Comparisons with predictions of current neutrino event generators are used to clarify the role of the $\Delta(1232)$ and higher-mass baryon resonances in CC pion production and to show the importance of pion final-state interactions. For the $\nu_\mu$-CC($\pi^{+}$) ($\bar{\nu}_{\mu}$-CC($\pi^{0}$)) sample, the absolute data rate is observed to lie below (above) the predictions of some of the event generators by amounts that are typically 1-to-2 $\sigma$. However the generators are able to reproduce the shapes of the differential cross sections for all kinematic variables of either data set., Comment: 17 pages, 16 figures; supplementary materials in Supplement file (TeX and pdf)
Published: 2016
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28. Measurement of $K^{+}$ production in charged-current $\nu_{\mu}$ interactions

Author: Marshall, C. M., Aliaga, L., Altinok, O., Bellantoni, L., Bercellie, A., Betancourt, M., Bodek, A., Bravar, A., Budd, H., Cai, T., Carneiro, M. F., Chvojka, J., da Motta, H., Devan, J., Dytman, S. A., Díaz, G. A., Eberly, B., Endress, E., Felix, J., Fields, L., Filkins, A., Fine, R., Gago, A. M., Galindo, R., Gallagher, H., Ghosh, A., Golan, T., Gran, R., Griswold, S., Harris, D. A., Higuera, A., Hurtado, K., Kiveni, M., Kleykamp, J., Kordosky, M., Le, T., Maher, E., Majoros, I., Manly, S., Mann, W. A., Caicedo, D. A. Martinez, McFarland, K. S., McGivern, C. L., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfín, J. G., Mousseau, J., Naples, D., Nelson, J. K., Norrick, A., Nuruzzaman, Osta, J., Paolone, V., Park, J., Patrick, C. E., Perdue, G. N., Rakotondravohitra, L., Ramirez, M. A., Ransome, R. D., Ray, H., Ren, L., Rimal, D., Rodrigues, P. A., Rosenberg, M., Ruterbories, D., Schellman, H., Schmitz, D. W., Shadler, L. A., Simon, C., Salinas, C. J. Solano, Falero, S. Sánchez, Tice, B. G., Valencia, E., Walton, T., Wang, Z., Watkins, P., Wiley, K., Wolcott, J., Wospakrik, M., and Zhang, D.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: Production of K^{+} mesons in charged-current \nu_{\mu} interactions on plastic scintillator (CH) is measured using MINERvA exposed to the low-energy NuMI beam at Fermilab. Timing information is used to isolate a sample of 885 charged-current events containing a stopping K^{+} which decays at rest. The differential cross section in K^{+} kinetic energy, d\sigma/dT_{K}, is observed to be relatively flat between 0 and 500 MeV. Its shape is in good agreement with the prediction by the \textsc{genie} neutrino event generator when final-state interactions are included, however the data rate is lower than the prediction by 15\%., Comment: added ancillary files with cross-section, statistical uncertainty covariance matrix and systematic uncertainty covariance matrix decomposed into flux and non-flux components
Published: 2016
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29. Evidence for neutral-current diffractive neutral pion production from hydrogen in neutrino interactions on hydrocarbon

Author: MINERvA Collaboration, Wolcott, J., Aliaga, L., Altinok, O., Bercellie, A., Betancourt, M., Bodek, A., Bravar, A., Budd, H., Cai, T., Carneiro, M. F., Chvojka, J., da Motta, H., Devan, J., Dytman, S. A., Díaz, G. A., Eberly, B., Endress, E., Felix, J., Fields, L., Fine, R., Galindo, R., Gallagher, H., Golan, T., Gran, R., Harris, D. A., Higuera, A., Hurtado, K., Kiveni, M., Kleykamp, J., Kordosky, M., Le, T., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., Caicedo, D. A. Martinez, McFarland, K. S., McGivern, C. L., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfín, J. G., Mousseau, J., Naples, D., Nelson, J. K., Norrick, A., Nuruzzaman, Osta, J., Paolone, V., Park, J., Patrick, C. E., Perdue, G. N., Rakotondravohitra, L., Ramirez, M. A., Ray, H., Ren, L., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Schmitz, D. W., Salinas, C. J. Solano, Falero, S. Sánchez, Tagg, N., Tice, B. G., Valencia, E., Walton, T., Wospakrik, M., and Zhang, D.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: The MINERvA experiment observes an excess of events containing electromagnetic showers relative to the expectation from Monte Carlo simulations in neutral-current neutrino interactions with mean beam energy of 4.5 GeV on a hydrocarbon target. The excess is characterized and found to be consistent with neutral-current neutral pion production with a broad energy distribution peaking at 7 GeV and a total cross section of 0.26 +- 0.02 (stat) +- 0.08 (sys) x 10^{-39} cm^{2}. The angular distribution, electromagnetic shower energy, and spatial distribution of the energy depositions of the excess are consistent with expectations from neutrino neutral-current diffractive neutral pion production from hydrogen in the hydrocarbon target. These data comprise the first direct experimental observation and constraint for a reaction that poses an important background process in neutrino oscillation experiments searching for muon neutrino to electron neutrino oscillations., Comment: 15 pages, 7 figures; accepted by Phys. Rev. Lett
Published: 2016
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30. Measurement of two-photon exchange effect by comparing elastic $e^\pm p$ cross sections

Author: Rimal, D., Adikaram, D., Raue, B. A., Weinstein, L. B., Arrington, J., Brooks, W. K., Ungaro, M., Adhikari, K. P., Akbar, Z., Pereira, S. Anefalos, Badui, R. A., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Bennett, R. P., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Bültmann, S., Carman, D. S., Celentano, A., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., Deur, A., Djalali, C., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Fleming, J. A., Forest, T. A., Fradi, A., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guo, L., Hafidi, K., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jiang, H., Joosten, S., Keller, D., Khetarpal, P., Khachatryan, G., Khandaker, M., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I . J . D., Markov, N., McKinnon, B., Mestayer, M. D., Mirazita, M., Mokeev, V., Movsisyan, A, Munevar, E., Camacho, C. Munoz, Nadel-Turonski, P., Ni, A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Puckett, A. J. R., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatié, F., Salgado, C., Schumacher, R. A., Seder, E., Sharabian, Y. G., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stankovic, Ivana, Stepanyan, S., Strauch, S., Sytnik, V., Taiuti, M., Torayev, B., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z. W., and Zonta, I.
Subjects: Nuclear Experiment
Abstract: [Background] The electromagnetic form factors of the proton measured by unpolarized and polarized electron scattering experiments show a significant disagreement that grows with the squared four momentum transfer ($Q^{2}$). Calculations have shown that the two measurements can be largely reconciled by accounting for the contributions of two-photon exchange (TPE). TPE effects are not typically included in the standard set of radiative corrections since theoretical calculations of the TPE effects are highly model dependent, and, until recently, no direct evidence of significant TPE effects has been observed. [Purpose] We measured the ratio of positron-proton to electron-proton elastic-scattering cross sections in order to determine the TPE contribution to elastic electron-proton scattering and thereby resolve the proton electric form factor discrepancy. [Methods] We produced a mixed simultaneous electron-positron beam in Jefferson Lab's Hall B by passing the 5.6 GeV primary electron beam through a radiator to produce a bremsstrahlung photon beam and then passing the photon beam through a convertor to produce electron/positron pairs. The mixed electron-positron (lepton) beam with useful energies from approximately 0.85 to 3.5 GeV then struck a 30-cm long liquid hydrogen (LH$_2$) target located within the CEBAF Large Acceptance Spectrometer (CLAS). By detecting both the scattered leptons and the recoiling protons we identified and reconstructed elastic scattering events and determined the incident lepton energy. A detailed description of the experiment is presented., Comment: 21 pages, 22 figures
Published: 2016
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31. Measurement of Partonic Nuclear Effects in Deep-Inelastic Neutrino Scattering using MINERvA

Author: MINERvA Collaboration, Mousseau, J., Wospakrik, M., Aliaga, L., Altinok, O., Bellantoni, L., Bercellie, A., Betancourt, M., Bodek, A., Bravar, A., Budd, H., Cai, T., Carneiro, M. F., Christy, M. E., Chvojka, J., da Motta, H., Devan, J., Dytman, S. A., Díaz, G. A., Eberly, B., Felix, J., Fields, L., Fine, R., Gago, A. M., Galindo, R., Gallagher, H., Ghosh, A., Golan, T., Gran, R., Harris, D. A., Higuera, A., Hurtado, K., Kiveni, M., Kleykamp, J., Kordosky, M., Le, T., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., Caicedo, D. A. Martinez, McFarland, K. S., McGivern, C. L., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfín, J. G., Naples, D., Nelson, J. K., Norrick, A., Nuruzzaman, Osta, J., Paolone, V., Park, J., Patrick, C. E., Perdue, G. N., Rakotondravohitra, L., Ramirez, M. A., Ransome, R. D., Ray, H., Ren, L., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Schmitz, D. W., Salinas, C. J. Solano, Tagg, N., Tice, B. G., Valencia, E., Walton, T., Wolcott, J., Zavala, G., and Zhang, D.
Subjects: High Energy Physics - Experiment
Abstract: The MINERvA collaboration reports a novel study of neutrino-nucleus charged-current deep inelastic scattering (DIS) using the same neutrino beam incident on targets of polystyrene, graphite, iron, and lead. Results are presented as ratios of C, Fe, and Pb to CH. The ratios of total DIS cross sections as a function of neutrino energy and flux-integrated differential cross sections as a function of the Bjorken scaling variable x are presented in the neutrino-energy range of 5 - 50 GeV. Good agreement is found between the data and predicted ratios, based on charged-lepton nucleus scattering, at medium x and low neutrino energies. However, the data rate appears depleted in the vicinity of the nuclear shadowing region, x < 0.1. This apparent deficit, reflected in the DIS cross-section ratio at high neutrino energy , is consistent with previous MINERvA observations and with the predicted onset of nuclear shadowing with the the axial-vector current in neutrino scattering.
Published: 2016
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32. Measurement of Neutrino Flux from Neutrino-Electron Elastic Scattering

Author: MINERvA Collaboration, Park, J., Aliaga, L., Altinok, O., Bellantoni, L., Bercellie, A., Betancourt, M., Bodek, A., Bravar, A., Budd, H., Cai, T., Carneiro, M. F., Christy, M. E., Chvojka, J., da Motta, H., Dytman, S. A., Diaz, G. A., Eberly, B., Felix, J., Fields, L., Fine, R., Gago, A. M., Galindo, R., Ghosh, A., Golan, T., Gran, R., Harris, D. A., Higuera, A., Kleykamp, J., Kordosky, M., Le, T., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., Caicedo, D. A. Martinez, McFarland, K. S., McGivern, C. L., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfin, J. G., Mousseau, J., Naples, D., Nelson, J. K., Norrick, A., Nuruzzaman, Osta, J., Paolone, V., Patrick, C. E., Perdue, G. N., Rakotondravohitra, L., Ramirez, M. A., Ray, H., Ren, L., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Salinas, C. J. Solano, Tagg, N., Tice, B. G., Valencia, E., Walton, T., Wolcott, J., Wospakrik, M., Zavala, G., and Zhang, D.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: Muon-neutrino elastic scattering on electrons is an observable neutrino process whose cross section is precisely known. Consequently a measurement of this process in an accelerator-based $\nu_\mu$ beam can improve the knowledge of the absolute neutrino flux impinging upon the detector; typically this knowledge is limited to $\sim$ 10% due to uncertainties in hadron production and focusing. We have isolated a sample of 135 $\pm$ 17 neutrino-electron elastic scattering candidates in the segmented scintillator detector of MINERvA, after subtracting backgrounds and correcting for efficiency. We show how this sample can be used to reduce the total uncertainty on the NuMI $\nu_\mu$ flux from 9% to 6%. Our measurement provides a flux constraint that is useful to other experiments using the NuMI beam, and this technique is applicable to future neutrino beams operating at multi-GeV energies., Comment: 11 pages, 11 figures
Published: 2015
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33. Observation of coherent elastic neutrino-nucleus scattering

Author: Akimov, D, Albert, JB, An, P, Awe, C, Barbeau, PS, Becker, B, Belov, V, Brown, A, Bolozdynya, A, Cabrera-Palmer, B, Cervantes, M, Collar, JI, Cooper, RJ, Cooper, RL, Cuesta, C, Dean, DJ, Detwiler, JA, Eberhardt, A, Efremenko, Y, Elliott, SR, Erkela, EM, Fabris, L, Febbraro, M, Fields, NE, Fox, W, Fu, Z, Galindo-Uribarri, A, Green, MP, Hai, M, Heath, MR, Hedges, S, Hornback, D, Hossbach, TW, Iverson, EB, Kaufman, LJ, Ki, S, Klein, SR, Khromov, A, Konovalov, A, Kremer, M, Kumpan, A, Leadbetter, C, Li, L, Lu, W, Mann, K, Markoff, DM, Miller, K, Moreno, H, Mueller, PE, Newby, J, Orrell, JL, Overman, CT, Parno, DS, Penttila, S, Perumpilly, G, Ray, H, Raybern, J, Reyna, D, Rich, GC, Rimal, D, Rudik, D, Scholberg, K, Scholz, BJ, Sinev, G, Snow, WM, Sosnovtsev, V, Shakirov, A, Suchyta, S, Suh, B, Tayloe, R, Thornton, RT, Tolstukhin, I, Vanderwerp, J, Varner, RL, Virtue, CJ, Wan, Z, Yoo, J, Yu, C-H, Zawada, A, Zettlemoyer, J, Zderic, AM, and Collaboration, COHERENT
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, COHERENT Collaboration, nucl-ex, hep-ex, hep-ph, nucl-th, General Science & Technology
Abstract: The coherent elastic scattering of neutrinos off nuclei has eluded detection for four decades, even though its predicted cross section is by far the largest of all low-energy neutrino couplings. This mode of interaction offers new opportunities to study neutrino properties and leads to a miniaturization of detector size, with potential technological applications. We observed this process at a 6.7σ confidence level, using a low-background, 14.6-kilogram CsI[Na] scintillator exposed to the neutrino emissions from the Spallation Neutron Source at Oak Ridge National Laboratory. Characteristic signatures in energy and time, predicted by the standard model for this process, were observed in high signal-to-background conditions. Improved constraints on nonstandard neutrino interactions with quarks are derived from this initial data set.
Published: 2017

34. Measurement of two-photon exchange effect by comparing elastic e±p cross sections

Author: Rimal, D, Adikaram, D, Raue, BA, Weinstein, LB, Arrington, J, Brooks, WK, Ungaro, M, Adhikari, KP, Afanasev, AV, Akbar, Z, Pereira, S Anefalos, Badui, RA, Ball, J, Baltzell, NA, Battaglieri, M, Batourine, V, Bedlinskiy, I, Biselli, AS, Boiarinov, S, Briscoe, WJ, Bültmann, S, Burkert, VD, Carman, DS, Celentano, A, Chetry, T, Ciullo, G, Clark, L, Colaneri, L, Cole, PL, Compton, N, Contalbrigo, M, Cortes, O, Crede, V, D'Angelo, A, Dashyan, N, De Vita, R, Deur, A, Djalali, C, Dupre, R, Egiyan, H, Alaoui, A El, Fassi, L El, Eugenio, P, Fanchini, E, Fedotov, G, Fersch, R, Filippi, A, Fleming, JA, Forest, TA, Fradi, A, Gevorgyan, N, Ghandilyan, Y, Gilfoyle, GP, Giovanetti, KL, Girod, FX, Gleason, C, Gohn, W, Golovatch, E, Gothe, RW, Griffioen, KA, Guo, L, Hafidi, K, Hanretty, C, Harrison, N, Hattawy, M, Heddle, D, Hicks, K, Holtrop, M, Hughes, SM, Ilieva, Y, Ireland, DG, Ishkhanov, BS, Isupov, EL, Jenkins, D, Jiang, H, Joosten, S, Keller, D, Khachatryan, G, Khandaker, M, Kim, W, Klein, A, Klein, FJ, Kubarovsky, V, Kuhn, SE, Kuleshov, SV, Lanza, L, Lenisa, P, Livingston, K, Lu, HY, MacGregor, IJD, Markov, N, McKinnon, B, Mestayer, MD, Mirazita, M, Mokeev, V, Movsisyan, A, Munevar, E, Camacho, C Munoz, Nadel-Turonski, P, and Ni, A
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, nucl-ex, Nuclear and plasma physics
Abstract: Background: The electromagnetic form factors of the proton measured by unpolarized and polarized electron scattering experiments show a significant disagreement that grows with the squared four-momentum transfer (Q2). Calculations have shown that the two measurements can be largely reconciled by accounting for the contributions of two-photon exchange (TPE). TPE effects are not typically included in the standard set of radiative corrections since theoretical calculations of the TPE effects are highly model dependent, and, until recently, no direct evidence of significant TPE effects has been observed. Purpose: We measured the ratio of positron-proton to electron-proton elastic-scattering cross sections in order to determine the TPE contribution to elastic electron-proton scattering and thereby resolve the proton electric form factor discrepancy. Methods: We produced a mixed simultaneous electron-positron beam in Jefferson Lab's Hall B by passing the 5.6-GeV primary electron beam through a radiator to produce a bremsstrahlung photon beam and then passing the photon beam through a convertor to produce electron-positron pairs. The mixed electron-positron (lepton) beam with useful energies from approximately 0.85 to 3.5 GeV then struck a 30-cm-long liquid hydrogen (LH2) target located within the CEBAF Large Acceptance Spectrometer (CLAS). By detecting both the scattered leptons and the recoiling protons, we identified and reconstructed elastic scattering events and determined the incident lepton energy. A detailed description of the experiment is presented. Results: We present previously unpublished results for the quantity R2γ, the TPE correction to the elastic-scattering cross section, at Q2≈0.85 and 1.45 GeV2 over a large range of virtual photon polarization ?. Conclusions: Our results, along with recently published results from VEPP-3, demonstrate a nonzero contribution from TPE effects and are in excellent agreement with the calculations that include TPE effects and largely reconcile the form-factor discrepancy up to Q2≈2GeV2. These data are consistent with an increase in R2γ with decreasing ? at Q2≈0.85 and 1.45 GeV2. There are indications of a slight increase in R2γ with Q2.
Published: 2017

35. Identification of nuclear effects in neutrino-carbon interactions at low three-momentum transfer

Author: Rodrigues, P. A., Demgen, J., Miltenberger, E., Aliaga, L., Altinok, O., Bellantoni, L., Bercellie, A., Betancourt, M., Bodek, A., Bravar, A., Budd, H., Kai, T., Carneiro, M. F., Chvojka, J., Devan, J., Dytman, S. A., Diaz, G. A., Eberly, B., Elkins, M., Felix, J., Fields, L., Fine, R., Gago, A. M., Galindo, R., Gallagher, H., Ghosh, A., Golan, T., Gran, R., Harris, D. A., Higuera, A., Hurtado, K., Kiveni, M., Kleykamp, J., Kordosky, M., Le, T., Leistico, J. R., Lovlein, A., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., Caicedo, D. A. Martinez, McFarland, K. S., McGivern, C. L., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfin, J., Mousseau, J., Muhlbeier, T., Naples, D., Nelson, J. K., Norrick, A., Nuruzzaman, Osta, J., Paolone, V., Patrick, C. E., Perdue, G. N., Ramirez, M. A., Ransome, R. D., Ray, H., Ren, L., Rimal, D., Ruterbories, D., Schellman, H., Schmitz, D. W., Salinas, C. J. Solano, Tagg, N., Tice, B. G., Valencia, E., Walton, T., Wolcott, J., Wospakrik, M., Zavala, G., and Zhang, D.
Subjects: High Energy Physics - Experiment
Abstract: Two different nuclear-medium effects are isolated using a low three-momentum transfer subsample of neutrino-carbon scattering data from the MINERvA neutrino experiment. The observed hadronic energy in charged-current $\nu_\mu$ interactions is combined with muon kinematics to permit separation of the quasielastic and $\Delta$(1232) resonance processes. First, we observe a small cross section at very low energy transfer that matches the expected screening effect of long-range nucleon correlations. Second, additions to the event rate in the kinematic region between the quasielastic and $\Delta$ resonance processes are needed to describe the data. The data in this kinematic region also has an enhanced population of multi-proton final states. Contributions predicted for scattering from a nucleon pair have both properties; the model tested in this analysis is a significant improvement but does not fully describe the data. We present the results as a double-differential cross section to enable further investigation of nuclear models. Improved description of the effects of the nuclear environment are required by current and future neutrino oscillation experiments., Comment: 7 pages, 3 figures, supplemental material. v2 includes updates from the review process. v3 includes ancillary files. v4 fixes incorrect exponent in Fig. 2 and supplemental files, synchronized with the erratum in the journal version
Published: 2015
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36. The COHERENT Experiment at the Spallation Neutron Source

Author: COHERENT Collaboration, Akimov, D., An, P., Awe, C., Barbeau, P. S., Barton, P., Becker, B., Belov, V., Bolozdynya, A., Burenkov, A., Cabrera-Palmer, B., Collar, J. I., Cooper, R. J., Cooper, R. L., Cuesta, C., Dean, D., Detwiler, J., Dolgolenko, A. G., Efremenko, Y., Elliott, S. R., Etenko, A., Fields, N., Fox, W., Galindo-Uribarri, A., Green, M., Heath, M., Hedges, S., Hornback, D., Iverson, E. B., Kaufman, L., Klein, S. R., Khromov, A., Konovalov, A., Kovalenko, A., Kumpan, A., Leadbetter, C., Li, L., Lu, W., Melikyan, Y., Markoff, D., Miller, K., Middlebrook, M., Mueller, P., Naumov, P., Newby, J., Parno, D., Penttila, S., Perumpilly, G., Radford, D., Ray, H., Raybern, J., Reyna, D., Rich, G. C., Rimal, D., Rudik, D., Scholberg, K., Scholz, B., Snow, W. M., Sosnovtsev, A., Shakirov, A., Suchyta, S., Suh, B., Tayloe, R., Thornton, R. T., Tolstukhin, A., Vetter, K., and Yu, C. H.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract: The COHERENT collaboration's primary objective is to measure coherent elastic neutrino-nucleus scattering (CEvNS) using the unique, high-quality source of tens-of-MeV neutrinos provided by the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). In spite of its large cross section, the CEvNS process has never been observed, due to tiny energies of the resulting nuclear recoils which are out of reach for standard neutrino detectors. The measurement of CEvNS has now become feasible, thanks to the development of ultra-sensitive technology for rare decay and weakly-interacting massive particle (dark matter) searches. The CEvNS cross section is cleanly predicted in the standard model; hence its measurement provides a standard model test. It is relevant for supernova physics and supernova-neutrino detection, and enables validation of dark-matter detector background and detector-response models. In the long term, precision measurement of CEvNS will address questions of nuclear structure. COHERENT will deploy multiple detector technologies in a phased approach: a 14-kg CsI[Na] scintillating crystal, 15 kg of p-type point-contact germanium detectors, and 100 kg of liquid xenon in a two-phase time projection chamber. Following an extensive background measurement campaign, a location in the SNS basement has proven to be neutron-quiet and suitable for deployment of the COHERENT detector suite. The simultaneous deployment of the three COHERENT detector subsystems will test the $N^2$ dependence of the cross section and ensure an unambiguous discovery of CEvNS. This document describes concisely the COHERENT physics motivations, sensitivity and plans for measurements at the SNS to be accomplished on a four-year timescale., Comment: 19 pages, 12 figures: corrections to author list
Published: 2015

37. Measurement of electron neutrino quasielastic and quasielastic-like scattering on hydrocarbon at $\langle E_{\nu} \rangle $ = 3.6 GeV

Author: MINERvA Collaboration, Wolcott, J., Altinok, O., Bellantoni, L., Bercellie, A., Betancourt, M., Bodek, A., Bravar, A., Budd, H., Carneiro, M. F., Chvojka, J., da Motta, H., Devan, J., Dytman, S. A., Diaz, G. A., Eberly, B., Felix, J., Fields, L., Fine, R., Galindo, R., Gallagher, H., Ghosh, A., Golan, T., Gran, R., Harris, D. A., Higuera, A., Kiveni, M., Kleykamp, J., Kordosky, M., Le, T., Maher, E., Manly, S., Mann, W. A., Marshall, C. M., Caicedo, D. A. Martinez, McFarland, K. S., McGivern, C. L., McGowan, A. M., Messerly, B., Miller, J., Mislivec, A., Morfin, J. G., Mousseau, J., Muhlbeier, T., Naples, D., Nelson, J. K., Norrick, A., Osta, J., Paolone, V., Park, J., Patrick, C. E., Perdue, G. N., Rakotondravohitra, L., Ransome, R. D., Ray, H., Ren, L., Rimal, D., Rodrigues, P. A., Ruterbories, D., Schellman, H., Schmitz, D. W., Salinas, C. J. Solano, Tagg, N., Tice, B. G., Valencia, E., Walton, T., Wospakrik, M., Zavala, G., Zhang, D., and Ziemer, B. P.
Subjects: High Energy Physics - Experiment
Abstract: The first direct measurement of electron-neutrino quasielastic and quasielastic-like scattering on hydrocarbon in the few-GeV region of incident neutrino energy has been carried out using the MINERvA detector in the NuMI beam at Fermilab. The flux-integrated differential cross sections in electron production angle, electron energy and $Q^{2}$ are presented. The ratio of the quasielastic, flux-integrated differential cross section in $Q^{2}$ for $\nu_{e}$ with that of similarly-selected $\nu_{\mu}$-induced events from the same exposure is used to probe assumptions that underpin conventional treatments of charged-current $\nu_{e}$ interactions used by long-baseline neutrino oscillation experiments. The data are found to be consistent with lepton universality and are well-described by the predictions of the neutrino event generator GENIE., Comment: includes ancillary files with flux, measured cross sections, and covariance matrices (v9 includes tables of nu_e + antinu_e / nu_mu ratio and associated covariances)
Published: 2015
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38. Momentum sharing in imbalanced Fermi systems

Author: Hen, O., Sargsian, M., Weinstein, L. B., Piasetzky, E., Hakobyan, H., Higinbotham, D. W., Braverman, M., Brooks, W. K., Gilad, S., Adhikari, K. P., Arrington, J., Asryan, G., Avakian, H., Ball, J., Baltzell, N. A., Battaglieri, M., Beck, A., Beck, S. May-Tal, Bedlinskiy, I., Bertozzi, W., Biselli, A., Burkert, V. D., Cao, T., Carman, D. S., Celentano, A., Chandavar, S., Colaneri, L., Cole, P. L., Crede, V., DAngelo, A., De Vita, R., Deur, A., Djalali, C., Doughty, D., Dugger, M., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Fedotov, G., Fegan, S., Forest, T., Garillon, B., Garcon, M., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Goetz, J. T., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hanretty, C., Hattawy, M., Hicks, K., Holtrop, M., Hyde, C. E., Ilieva, Y., Ireland, D. G., Ishkanov, B. I., Isupov, E. L., Jiang, H., Jo, H. S., Joo, K., Keller, D., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Koirala, S., Korover, I., Kuhn, S. E., Kubarovsky, V., Lenisa, P., Levine, W. I., Livingston, K., Lowry, M., Lu, H. Y., MacGregor, I. J. D., Markov, N., Mayer, M., McKinnon, B., Mineeva, T., Mokeev, V., Movsisyan, A., Camacho, C. Munoz, Mustapha, B., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Pappalardo, L. L., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Puckett, A. J. R., Rimal, D., Ripani, M., Ritchie, B. G., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatie, F., Schott, D., Schumacher, R. A., Sharabian, Y. G., Smith, G. D., Shneor, R., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Stoler, P., Strauch, S., Sytnik, V., Taiuti, M., Tkachenko, S., Ungaro, M., Vlassov, A. V., Voutier, E., Watts, D., Walford, N. K., Wei, X., Wood, M. H., Wood, S. A., Zachariou, N., Zana, L., Zhao, Z. W., Zheng, X., and Zonta, I.
Subjects: Nuclear Experiment, Condensed Matter - Quantum Gases, Nuclear Theory
Abstract: The atomic nucleus is composed of two different kinds of fermions, protons and neutrons. If the protons and neutrons did not interact, the Pauli exclusion principle would force the majority fermions (usually neutrons) to have a higher average momentum. Our high-energy electron scattering measurements using 12C, 27Al, 56Fe and 208Pb targets show that, even in heavy neutron-rich nuclei, short-range interactions between the fermions form correlated high-momentum neutron-proton pairs. Thus, in neutron-rich nuclei, protons have a greater probability than neutrons to have momentum greater than the Fermi momentum. This finding has implications ranging from nuclear few body systems to neutron stars and may also be observable experimentally in two-spin state, ultra-cold atomic gas systems., Comment: Published in Science. 10 pages, 3 figures
Published: 2014
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39. Towards a resolution of the proton form factor problem: new electron and positron scattering data

Author: Adikaram, D., Rimal, D., Weinstein, L. B., Raue, B., Khetarpal, P., Bennett, R. P., Arrington, J., Brooks, W. K., Adhikari, K. P., Afanasev, A. V., Amaryan, M. J., Anderson, M. D., Ball, J., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Bono, J., Boiarinov, S., Briscoe, W. J., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Colaneri, L., Cole, P. L., Contalbrigo, M., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dodge, G. E., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Fleming, J. A., Fradi, A., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Harrison, N., Hattawy, M., Hicks, K., Holtrop, M., Hughes, S. M., Hyde, C. E., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Jenkins, D., Jiang, H., Joo, K., Joosten, S., Khandaker, M., Kim, W., Klein, A., Klein, F. J., Koirala, S., Kubarovsky, V., Kuhn, S. E., Lu, H. Y., MacGregor, I . J . D., Markov, N., Mayer, M., McKinnon, B., Mestayer, M. D., Meyer, C. A., Mirazita, M., Mokeev, V., Montgomery, R. A., Moody, C. I., Moutarde, H., Movsisyan, A, Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Park, K., Pasyuk, E., Pisano, S., Pogorelko, O., Procureur, S., Prok, Y., Protopopescu, D., Puckett, A. J. R., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Schott, D., Schumacher, R. A., Sharabian, Y. G., Simonyan, A., Skorodumina, I., Smith, E. S., Smith, G. D., Sober, D. I., Sparveris, N., Stepanyan, S., Strauch, S., Sytnik, V., Taiuti, M., Tian, Ye, Trivedi, A., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z. W., Zonta, I., and Collaboration, The CLAS
Subjects: Nuclear Experiment
Abstract: There is a significant discrepancy between the values of the proton electric form factor, $G_E^p$, extracted using unpolarized and polarized electron scattering. Calculations predict that small two-photon exchange (TPE) contributions can significantly affect the extraction of $G_E^p$ from the unpolarized electron-proton cross sections. We determined the TPE contribution by measuring the ratio of positron-proton to electron-proton elastic scattering cross sections using a simultaneous, tertiary electron-positron beam incident on a liquid hydrogen target and detecting the scattered particles in the Jefferson Lab CLAS detector. This novel technique allowed us to cover a wide range in virtual photon polarization ($\varepsilon$) and momentum transfer ($Q^2$) simultaneously, as well as to cancel luminosity-related systematic errors. The cross section ratio increases with decreasing $\varepsilon$ at $Q^2 = 1.45 \text{ GeV}^2$. This measurement is consistent with the size of the form factor discrepancy at $Q^2\approx 1.75$ GeV$^2$ and with hadronic calculations including nucleon and $\Delta$ intermediate states, which have been shown to resolve the discrepancy up to $2-3$ GeV$^2$., Comment: 6 pages, 4 figures, submitted to PRL
Published: 2014
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40. Induced polarization of {\Lambda}(1116) in kaon electroproduction

Author: Gabrielyan, M., Raue, B. A., Carman, D. S., Park, K., Adhikari, K. P., Adikaram, D., Amaryan, M. J., Pereira, S. Anefalos, Avakian, H., Ball, J., Baltzell, N. A., Battaglieri, M., Baturin, V., Bedlinskiy, I., Biselli, A. S., Bono, J., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Cao, T., Celentano, A., Chandavar, S., Charles, G., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., DAngelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., Fassi, L. El, Eugenio, P., Fedotov, G., Fegan, S., Fleming, J. A., Forest, T. A., Garillon, B., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hattawy, M., Hicks, K., Ho, D., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Jenkins, D., Jiang, H., Jo, H. S., Joo, K., Keller, D., Khandaker, M., Kim, W., Klein, F. J., Koirala, S., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Lenisa, P., Levine, W. I., Livingston, K., MacGregor, I. J. D., Mayer, M., McKinnon, B., Meyer, C. A., Mestayer, M. D., Mirazita, M., Mokeev, V., Moody, C. I., Moutarde, H., Movsisyan, A, Munevar, E., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Peng, P., Phelps, W., Phillips, J. J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Protopopescu, D., Rimal, D., Ripani, M., Rizzo, A., Sabatie, F., Salgado, C., Schott, D., Schumacher, R. A., Simonyan, A., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Strakovsky, I. I., Strauch, S., Sytnik, V., Tang, W., Ungaro, M., Vlassov, A. V., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Zachariou, N., Zana, L., and Zhang, J.
Subjects: Nuclear Experiment
Abstract: We have measured the induced polarization of the ${\Lambda}(1116)$ in the reaction $ep\rightarrow e'K^+{\Lambda}$, detecting the scattered $e'$ and $K^+$ in the final state along with the proton from the decay $\Lambda\rightarrow p\pi^-$.The present study used the CEBAF Large Acceptance Spectrometer (CLAS), which allowed for a large kinematic acceptance in invariant energy $W$ ($1.6\leq W \leq 2.7$ GeV) and covered the full range of the kaon production angle at an average momentum transfer $Q^2=1.90$ GeV$^2$.In this experiment a 5.50 GeV electron beam was incident upon an unpolarized liquid-hydrogen target. We have mapped out the $W$ and kaon production angle dependencies of the induced polarization and found striking differences from photoproduction data over most of the kinematic range studied. However, we also found that the induced polarization is essentially $Q^2$ independent in our kinematic domain, suggesting that somewhere below the $Q^2$ covered here there must be a strong $Q^2$ dependence. Along with previously published photo- and electroproduction cross sections and polarization observables, these data are needed for the development of models, such as effective field theories, and as input to coupled-channel analyses that can provide evidence of previously unobserved $s$-channel resonances., Comment: 13 figures
Published: 2014
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41. Precision measurements of $g_1$ of the proton and the deuteron with 6 GeV electrons

Author: Prok, Y., Bosted, P., Kvaltine, N., Adhikari, K. P., Adikaram, D., Aghasyan, M., Amaryan, M. J., Anderson, M. D., Pereira, S. Anefalos, Avakian, H., Baghdasaryan, H., Ball, J., Baltzell, N. A., Battaglieri, M., Biselli, A. S., Bono, J., Briscoe, W. J., Brock, J., Brooks, W. K., Bültmann, S., Burkert, V. D., Carlin, C., Carman, D. S., Celentano, A., Chandavar, S., Colaneri, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crabb, D., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dodge, G. E., Doughty, D., Dupre, R., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Fedotov, G., Fegan, S., Fersch, R., Fleming, J. A., Forest, T. A., Garcon, M., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Giovanetti, K. L., Goetz, J. T., Gohn, W., Gothe, R. W., Griffioen, K. A., Guegan, B., Guler, N., Haffidi, K., Hanretty, C., Harrison, N., Hattawy, M., Hicks, K., Ho, D., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jawalkar, S., Jiang, X., Jo, H. S., Joo, K., Kalantarians, N., Keith, C., Keller, D., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Koirala, S., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I . J. D., Markov, N., Mayee, M., McKinnon, B., Meekins, D., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R. A., Moutarde, H., Movsisyan, A, Munevar, E., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Park, K., Peng, P., Phillips, J. J., Pierce, J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Protopopescu, D., Puckett, A. J. R., Raue, B. A., Rimal, D., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatié, F., Saini, M. S., Salgado, C., Schott, D., Schumacher, R. A., Seder, E., Sharabian, Y. G., Simonyan, A., Smith, C., Smith, G., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Strakovsky, I. I., Strauch, S., Sytnik, V., Taiuti, M., Tang, W., Tkachenko, S., Ungaro, M., Vernarsky, B ., Vlassov, A. V., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D . P., Weinstein, L. B., Zachariou, N., Zana, L., Zhang, J., Zhao, B., Zhao, Z. W., and Zonta, I.
Subjects: Nuclear Experiment
Abstract: The inclusive polarized structure functions of the proton and deuteron, g1p and g1d, were measured with high statistical precision using polarized 6 GeV electrons incident on a polarized ammonia target in Hall B at Jefferson Laboratory. Electrons scattered at lab angles between 18 and 45 degrees were detected using the CEBAF Large Acceptance Spectrometer (CLAS). For the usual DIS kinematics, Q^2>1 GeV^2 and the final-state invariant mass W>2 GeV, the ratio of polarized to unpolarized structure functions g1/F1 is found to be nearly independent of Q^2 at fixed x. Significant resonant structure is apparent at values of W up to 2.3 GeV. In the framework of perturbative QCD, the high-W results can be used to better constrain the polarization of quarks and gluons in the nucleon, as well as high-twist contributions.
Published: 2014
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42. Measurement of the structure function of the nearly free neutron using spectator tagging in inelastic $^2$H(e, e'p)X scattering with CLAS

Author: Tkachenko, S., Baillie, N., Kuhn, S. E., Zhang, J., Arrington, J., Bosted, P., Bültmann, S., Christy, M. E., Dutta, D., Ent, R., Fenker, H., Griffioen, K. A., Ispiryan, M., Kalantarians, N., Keppel, C. E., Melnitchouk, W., Tvaskis, V., Adhikari, K. P., Aghasyan, M., Amaryan, M. J., Pereira, S. Anefalos, Avakian, H., Ball, J., Baltzell, N. A., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dodge, G. E., Doughty, D., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Eugenio, P., Fedotov, G., Fleming, J. A., Garillon, B., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Golovatch, E., Gothe, R. W., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Hicks, K., Ho, D., Holtrop, M., Hyde, C . E., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Jo, H. S., Keller, D., Khandaker, M., Kim, A., Kim, W., King, P. M., Klein, A., Klein, F. J., Koirala, S., Kubarovsky, V., Kuleshov, S. V., Lenisa, P., Lewis, S., Livingston, K., Lu, H., MacCormick, M., MacGregor, I. J. D., Markov, N., Mayer, M., McKinnon, B., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R. A., Moutarde, H., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Pappalardo, L. L., Paremuzyan, R., Park, K., Pasyuk, E., Phillips, J. J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Protopopescu, D., Puckett, A. J . R., Rimal, D., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatié, F., Schott, D., Schumacher, R. A., Seder, E., Senderovich, I., Sharabian, Y. G., Simonyan, A., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S., Stepanyan, S. S., Strauch, S., Tang, W., Ungaro, M., Vlassov, A. V., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D., Wei, X., Weinstein, L. B., Wood, M. H., Zana, L., and Zonta, I.
Subjects: Nuclear Experiment
Abstract: Much less is known about neutron structure than that of the proton due to the absence of free neutron targets. Neutron information is usually extracted from data on nuclear targets such as deuterium, requiring corrections for nuclear binding and nucleon off-shell effects. These corrections are model dependent and have significant uncertainties, especially for large values of the Bjorken scaling variable x. The Barely Off-shell Nucleon Structure (BONuS) experiment at Jefferson Lab measured the inelastic electron deuteron scattering cross section, tagging spectator protons in coincidence with the scattered electrons. This method reduces nuclear binding uncertainties significantly and has allowed for the first time a (nearly) model independent extraction of the neutron structure function. A novel compact radial time projection chamber was built to detect protons with momentum between 70 and 150 MeV/c. For the extraction of the free neutron structure function $F_{2n}$, spectator protons at backward angle and with momenta below 100 MeV/c were selected, ensuring that the scattering took place on a nearly free neutron. The scattered electrons were detected with Jefferson Lab's CLAS spectrometer. The extracted neutron structure function $F_{2n}$ and its ratio to the deuteron structure function $F_{2d}$ are presented in both the resonance and deep inelastic regions. The dependence of the cross section on the spectator proton momentum and angle is investigated, and tests of the spectator mechanism for different kinematics are performed. Our data set can be used to study neutron resonance excitations, test quark hadron duality in the neutron, develop more precise parametrizations of structure functions, as well as investigate binding effects (including possible mechanisms for the nuclear EMC effect) and provide a first glimpse of the asymptotic behavior of d/u as x goes to 1., Comment: 28 pages, 22 figures; published in Phys. Rev. C. Revised to include three authors inadvertently left off the original version: D. Dutta, R. Ent, and M. Ispiryan
Published: 2014
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43. Suicidal ideation among Nepali widows: an exploratory study of risk factors and comorbid psychosocial problems

Author: Garrison-Desany, H. M., Lasater, M. E., Luitel, N. P., Rimal, D., Pun, D., Shrestha, S., Tol, W., and Surkan, P. J.
Published: 2020
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44. Hard Two-body Photodisintegration of 3He

Author: Pomerantz, I., Ilieva, Y., Gilman, R., Higinbotham, D. W., Piasetzky, E., Strauch, S., Adhikari, K. P., Aghasyan, M., Allada, K., Amaryan, M. J., Pereira, S. Anefalos, Anghinolfi, M., Baghdasaryan, H., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Beck, A., Beck, S., Bedlinskiy, I., Berman, B. L., Biselli, A. S., Boeglin, W., Bono, J., Bookwalter, C., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Bubis, N., Burkert, V., Camsonne, A., Canan, M., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Chirapatpimol, K., Cisbani, E., Cole, P. L., Contalbrigo, M., Crede, V., Cusanno, F., D'Angelo, A., Daniel, A., Dashyan, N., de Jager, C. W., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dodge, G. E., Doughty, D., Dupre, R., Dutta, C., Egiyan, H., Alaoui, A. El, Fassi, L. El, Eugenio, P., Fedotov, G., Fegan, S., Fleming, J. A., Fradi, A., Garibaldi, F., Geagla, O., Gevorgyan, N., Giovanetti, K. L., Girod, F. X., Glister, J., Goetz, J. T., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guegan, B., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Harrison, N., Heddle, D., Hicks, K., Ho, D., Holtrop, M., Hyde, C. E., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jiang, X., Jo, H. S., Joo, K., Katramatou, A. T., Keller, D., Khandaker, M., Khetarpal, P., Khrosinkova, E., Kim, A., Kim, W., Klein, F. J., Koirala, S., Kubarovsky, A., Kubarovsky, V., Kuleshov, S. V., Kvaltine, N. D., Lee, B., LeRose, J. J., Lewis, S., Lindgren, R., Livingston, K., Lu, H. Y., MacGregor, I. J. D., Mao, Y., Martinez, D., Mayer, M., McCullough, E., McKinnon, B., Meekins, D., Meyer, C. A., Michaels, R., Mineeva, T., Mirazita, M., Moffit, B., Mokeev, V., Montgomery, R. A., Moutarde, H., Munevar, E., Camacho, C. Munoz, Nadel-Turonski, P., Nasseripour, R., Nepali, C. S., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Park, K., Park, S., Petratos, G. G., Phelps, E., Pisano, S., Pogorelko, O., Pozdniakov, S., Procureur, S., Protopopescu, D., Puckett, A. J. R., Qian, X., Qiang, Y., Ricco, G., Rimal, D., Ripani, M., Ritchie, B. G., Rodriguez, I., Ron, G., Rosner, G., Rossi, P., Sabatie, F., Saha, A., Saini, M. S., Sarty, A. J., Sawatzky, B., Saylor, N. A., Schott, D., Schulte, E., Schumacher, R. A., Seder, E., Seraydaryan, H., Shneor, R., Smith, G. D., Sokhan, D., Sparveris, N., Stepanyan, S. S., Stepanyan, S., Stoler, P., Subedi, R., Sulkosky, V., Taiuti, M., Tang, W., Taylor, C. E., Tkachenko, S., Ungaro, M., Vernarsky, B., Vineyard, M. F., Voskanyan, H., Voutier, E., Walford, N. K., Wang, Y., Watts, D. P., Weinstein, L. B., Weygand, D. P., Wojtsekhowski, B., Wood, M. H., Yan, X., Yao, H., Zachariou, N., Zhan, X., Zhang, J., Zhao, Z. W., Zheng, X., and Zonta, I.
Subjects: Nuclear Experiment
Abstract: We have measured cross sections for the gamma+3He->p+d reaction at photon energies of 0.4 - 1.4 GeV and a center-of-mass angle of 90 deg. We observe dimensional scaling above 0.7 GeV at this center-of-mass angle. This is the first observation of dimensional scaling in the photodisintegration of a nucleus heavier than the deuteron.
Published: 2013
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45. Transverse Polarization of $\Sigma^{+}(1189)$ in Photoproduction on a Hydrogen Target in CLAS

Author: Nepali, C. S., Amaryan, M., Adhikari, K. P., Aghasyan, M., Pereira, S. Anefalos, Baghdasaryan, H., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Bono, J., Boiarinov, S., Briscoe, W. J., Bültmann, S., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Cole, P. L., Collins, P., Contalbrigo, M., Crede, V., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., Alaoui, A. El, Fassi, L. El, Fedotov, G., Fegan, S., Fersch, R., Fleming, J. A., Gabrielyan, M. Y., Gevorgyan, N., Giovanetti, K. L., Girod, F. X., Glazier, D. I., Goetz, J. T., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guler, N., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Heddle, D., Hicks, K., Ho, D., Holtrop, M., Hyde, C. E., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, A., Klein, F. J., Koirala, S., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Kvaltine, N. D., Lu, H. Y., MacGregor, I . J . D., Markov, N., Mayer, M., McKinnon, B., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R. A., Munevar, E., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Phelps, E., Phillips, J. J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Protopopescu, D., Puckett, A. J. R., Raue, B. A., Rimal, D., Ripani, M., Ritchie, B. G., Rosner, G., Rossi, P., Sabatié, F., Saini, M. S., Salgado, C., Schott, D., Schumacher, R. A., Seder, E., Seraydaryan, H., Sharabian, Y. G., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tang, W., Taylor, C. E., Tian, Ye, Tkachenko, S., Torayev, B., Vernarsky, B., Vlassov, A. V., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Weinstein, L. B., Weygand, D. P., Zachariou, N., Zana, L., Zhang, J., Zhao, Z. W., and Zonta, I.
Subjects: Nuclear Experiment
Abstract: Experimental results on the $\Sigma^+(1189)$ hyperon transverse polarization in photoproduction on a hydrogen target using the CLAS detector at Jefferson laboratory are presented. The $\Sigma^+(1189)$ was reconstructed in the exclusive reaction $\gamma+p\rightarrow K^{0}_{S} + \Sigma^+(1189)$ via the $\Sigma^{+} \to p \pi^{0}$ decay mode. The $K^{0}_S$ was reconstructed in the invariant mass of two oppositely charged pions with the $\pi^0$ identified in the missing mass of the detected $p\pi^+\pi^-$ final state. Experimental data were collected in the photon energy range $E_{\gamma}$ = 1.0-3.5 GeV ($\sqrt{s}$ range 1.66-2.73 GeV). We observe a large negative polarization of up to 95%. As the mechanism of transverse polarization of hyperons produced in unpolarized photoproduction experiments is still not well understood, these results will help to distinguish between different theoretical models on hyperon production and provide valuable information for the searches of missing baryon resonances., Comment: pages 11
Published: 2013
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46. Near Threshold Neutral Pion Electroproduction at High Momentum Transfers and Generalized Form Factors

Author: Khetarpal, P., Stoler, P., Aznauryan, I. G., Kubarovsky, V., Adhikari, K. P., Adikaram, D., Aghasyan, M., Amaryan, M. J., Anderson, M. D., Pereira, S. Anefalos, Anghinolfi, M., Avakian, H., Baghdasaryan, H., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Bono, J., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Charles, G., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dugger, M., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Eugenio, P., Fedotov, G., Fegan, S., Fersch, R., Fleming, J. A., Fradi, A., Gabrielyan, M. Y., Garçon, M., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guegan, B., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hicks, K., Ho, D., Holtrop, M., Hyde, C. E., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Joo, K., Keller, D., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Koirala, S., Kubarovsky, A., Kuleshov, S. V., Kvaltine, N. D., Lewis, S., Livingston, K., Lu, H. Y., MacGregor, I. J. D., Mao, Y., Martinez, D., Mayer, M., McKinnon, B., Meyer, C. A., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R. A., Moutarde, H., Munevar, E., Camacho, C. Munoz, Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Phelps, E., Phillips, J. J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Protopopescu, D., Puckett, A. J. R., Raue, B. A., Ricco, G., Rimal, D., Ripani, M., Rosner, G., Rossi, P., Sabatié, F., Saini, M. S., Salgado, C., Saylor, N. A., Schott, D., Schumacher, R. A., Seder, E., Seraydaryan, H., Sharabian, Y. G., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tang, W., Taylor, C. E., Tkachenko, S., Ungaro, M., Vernarsky, B., Voskanyan, H., Voutier, E., Walford, N. K., Weinstein, L. B., Weygand, D. P., Wood, M. H., Zachariou, N., Zhang, J., Zhao, Z. W., and Zonta, I.
Subjects: Nuclear Experiment
Abstract: We report the measurement of near threshold neutral pion electroproduction cross sections and the extraction of the associated structure functions on the proton in the kinematic range $Q^2$ from 2 to 4.5 GeV$^2$ and $W$ from 1.08 to 1.16 GeV. These measurements allow us to access the dominant pion-nucleon s-wave multipoles $E_{0+}$ and $S_{0+}$ in the near-threshold region. In the light-cone sum-rule framework (LCSR), these multipoles are related to the generalized form factors $G_1^{\pi^0 p}(Q^2)$ and $G_2^{\pi^0 p}(Q^2)$. The data are compared to these generalized form factors and the results for $G_1^{\pi^0 p}(Q^2)$ are found to be in good agreement with the LCSR predictions, but the level of agreement with $G_2^{\pi^0 p}(Q^2)$ is poor., Comment: 17 pages, 18 figures, Journal article (Physical Review C)
Published: 2012
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47. Measurement of Exclusive $\pi^0$ Electroproduction Structure Functions and their Relationship to Transversity GPDs

Author: CLAS Collaboration, Bedlinskiy, I., Kubarovsky, V., Niccolai, S., Stoler, P., Adhikari, K. P., Aghasyan, M., Amaryan, M. J., Anghinolfi, M., Avakian, H., Baghdasaryan, H., Ball, J., Baltzell, N. A., Battaglieri, M., Bennett, R. P., Biselli, A. S., Bookwalter, C., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Contalbrigo, M., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Fleming, J. A., Forest, T. A., Garçon, M., Gevorgyan, N., Giovanetti, K. L., Girod, F. X., Gohn, W., Gothe, R. W., Graham, L., Griffioen, K. A., Guegan, B., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, F. J., Koirala, S., Kubarovsky, A., Kuhn, S. E., Kuleshov, S. V., Kvaltine, N. D., Livingston, K., Lu, H. Y., MacGregor, I. J. D., Mao, Y., Markov, N., Martinez, D., Mayer, M., McKinnon, B., Meyer, C. A., Mineeva, T., Mirazita, M., Mokeev, V., Moutarde, H., Munevar, E., Camacho, C. Munoz, Nadel-Turonski, P., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Pereira, S. Anefalos, Phelps, E., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Puckett, A. J. R., Raue, B. A., Ricco, G., Rimal, D., Ripani, M., Rosner, G., Rossi, P., Sabatié, F., Saini, M. S., Salgado, C., Saylor, N., Schott, D., Schumacher, R. A., Seder, E., Seraydaryan, H., Sharabian, Y. G., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Strauch, S., Taiuti, M., Tang, W., Taylor, C. E., Tian, Ye, Tkachenko, S., Ungaro, M., Vineyard, M. F., Vlassov, A., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Weinstein, L. B., Weygand, D. P., Wood, M. H., Zachariou, N., Zhang, J., Zhao, Z. W., and Zonta, I.
Subjects: High Energy Physics - Experiment, High Energy Physics - Phenomenology, Nuclear Experiment
Abstract: Exclusive $\pi^0$ electroproduction at a beam energy of 5.75 GeV has been measured with the Jefferson Lab CLAS spectrometer. Differential cross sections were measured at more than 1800 kinematic values in $Q^2$, $x_B$, $t$, and $\phi_\pi$, in the $Q^2$ range from 1.0 to 4.6 GeV$^2$,\ $-t$ up to 2 GeV$^2$, and $x_B$ from 0.1 to 0.58. Structure functions $\sigma_T +\epsilon \sigma_L, \sigma_{TT}$ and $\sigma_{LT}$ were extracted as functions of $t$ for each of 17 combinations of $Q^2$ and $x_B$. The data were compared directly with two handbag-based calculations including both longitudinal and transversity GPDs. Inclusion of only longitudinal GPDs very strongly underestimates $\sigma_T +\epsilon \sigma_L$ and fails to account for $\sigma_{TT}$ and $\sigma_{LT}$, while inclusion of transversity GPDs brings the calculations into substantially better agreement with the data. There is very strong sensitivity to the relative contributions of nucleon helicity flip and helicity non-flip processes. The results confirm that exclusive $\pi^0$ electroproduction offers direct experimental access to the transversity GPDs., Comment: 6 pages, 2 figures
Published: 2012
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48. Deep exclusive $\pi^+$ electroproduction off the proton at CLAS

Author: Park, K., Guidal, M., Gothe, R. W., Laget, J. M., Garçon, M., Adhikari, K. P., Aghasyan, M., Amaryan, M. J., Anghinolfi, M., Avakian, H., Baghdasaryan, H., Ball, J., Baltzell, N. A., Battaglieri, M., Bedlinsky, I., Bennett, R. P., Biselli, A. S., Bookwalter, C., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Contalbrigo, M., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dodge, G. E., Doughty, D., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Fradi, A., Eugenio, P., Fedotov, G., Fegan, S., Fleming, J. A., Forest, T. A., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gohn, W., Golovatch, E., Graham, L., Griffioen, K. A., Guegan, B., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Heddle, D., Hicks, K., Ho, D., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Jenkins, D., Jo, H. S., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, F. J., Koirala, S., Kubarovsky, A., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Livingston, K., Lu, H. Y., MacGregor, I. J. D., Mao, Y., Markov, N., Martinez, D., Mayer, M., McKinnon, B., Meyer, C. A., Mineeva, T., Mirazita, M., Mokeev, V., Moutarde, H., Munevar, E., Camacho, C. Munoz, Nadel-Turonski, P., Nepali, C. S., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Park, S., Pasyuk, E., Pereira, S. Anefalos, Phelps, E., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Protopopescu, D., Puckett, A. J. R., Raue, B. A., Ricco, G., Rimal, D., Ripani, M., Rosner, G., Rossi, P., Sabatie, F., Saini, M. S., Salgado, C., Schott, D., Schumacher, R. A., Seder, E., Seraydaryan, H., Sharabian, Y. G., Smith, E. S., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stoler, P., Strakovsky, I. I., Strauch, S., Taiuti, M., Tang, W., Taylor, C. E., Tian, Ye, Tkachenko, S., Trivedi, A., Ungaro, M., Vernarsky, B ., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Weinstein, L. B., Weygand, D. P., Wood, M. H., Zachariou, N., Zhang, J., Zhao, Z. W., and Zonta, I.
Subjects: Nuclear Experiment
Abstract: The exclusive electroproduction of $\pi^+$ above the resonance region was studied using the $\rm{CEBAF}$ Large Acceptance Spectrometer ($\rm{CLAS}$) at Jefferson Laboratory by scattering a 6 GeV continuous electron beam off a hydrogen target. The large acceptance and good resolution of $\rm{CLAS}$, together with the high luminosity, allowed us to measure the cross section for the $\gamma^* p \to n \pi^+$ process in 140 ($Q^2$, $x_B$, $t$) bins: $0.16
Published: 2012
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49. Evidence for the Onset of Color Transparency in $\rho^0$ Electroproduction off Nuclei

Author: Fassi, L. El, Zana, L., Hafidi, K., Holtrop, M., Mustapha, B., Brooks, W. K., Hakobyan, H., Zheng, X., Adhikari, K. P., Adikaram, D., Aghasyan, M., Amaryan, M. J., Anghinolfi, M., Arrington, J., Avakian, H., Baghdasaryan, H., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Bookwalter, C., Branford, D., Briscoe, W. J., Bultmann, S., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Dey, B., Dickson, R., Djalali, C., Dodge, G. E., Doughty, D., Dupre, R., Egiyan, H., Alaoui, A. El, Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Gabrielyan, M. Y., Garcon, M., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hanretty, C., Heddle, D., Hicks, K., Holt, R. J., Hyde, C. E., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jawalkar, S. S., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Kuznetsov, V., Laget, J. M., Lu, H. Y., MacGregor, I. J. D., Mao, Y., Markov, N., Mayer, M., McAndrew, J., McKinnon, B., Meyer, C. A., Mineeva, T., Mirazita, M., Mokeev, V., Moreno, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Ni, A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Pappalardo, L., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Pereira, S. Anefalos, Phelps, E., Pisano, S., Pozdniakov, S., Price, J. W., Procureur, S., Protopopescu, D., Raue, B. A., Reimer, P. E., Ricco, G., Rimal, D., Ripani, M., Ritchie, B. G., Rosner, G., Rossi, P., Sabatie, F., Saini, M. S., Salgado, C., Schott, D., Schumacher, R. A., Seraydaryan, H., Sharabian, Y. G., Smith, E. S., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Stoler, P., Strauch, S., Taiuti, M., Tang, W., Taylor, C. E., Tedeschi, D. J., Tkachenko, S., Ungaro, M., Vernarsky, B ., Vineyard, M. F., Voskanyan, H., Voutier, E., Watts, D., Weinstein, L. B., Weygand, D. P., Wood, M. H., Zachariou, N., Zhao, B., and Zhao, Z. W.
Subjects: Nuclear Experiment
Abstract: We have measured the nuclear transparency of the incoherent diffractive $A(e,e'\rho^0)$ process in $^{12}$C and $^{56}$Fe targets relative to $^2$H using a 5 GeV electron beam. The nuclear transparency, the ratio of the produced $\rho^0$'s on a nucleus relative to deuterium, which is sensitive to $\rho A$ interaction, was studied as function of the coherence length ($l_c$), a lifetime of the hadronic fluctuation of the virtual photon, and the four-momentum transfer squared ($Q^2$). While the transparency for both $^{12}$C and $^{56}$Fe showed no $l_c$ dependence, a significant $Q^2$ dependence was measured, which is consistent with calculations that included the color transparency effects., Comment: 6 pages and 4 figures
Published: 2012
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50. Measurement of the neutron F2 structure function via spectator tagging with CLAS

Author: Baillie, N., Tkachenko, S., Zhang, J., Bosted, P., Bultmann, S., Christy, M. E., Fenker, H., Griffioen, K. A., Keppel, C. E., Kuhn, S. E., Melnitchouk, W., Tvaskis, V., Adhikari, K. P., Adikaram, D., Aghasyan, M., Amaryan, M. J., Anghinolfini, M., Arrington, J., Avakian, H., Baghdasaryan, H., Battaglieri, M., Biselli, A. S., Branford, 5 D., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Dey, B., Djalali, C., Dodge, G., Domingo, J., Doughty, D., Dupre, R., Dutta, D., Ent, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Fradi, A., Gabrielyan, M. Y., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gohn, W., Golovatch, E., Gothe, R. W., Graham, L., Guegan, B., Guidal, M., Guler, N., Guo, L., Hafidi, K., Heddle, D., Hicks, K., Holtrop, M., Hungerford, E., Hyde, C. E., Ilieva, Y., Ireland, D. G., Ispiryan, M., Isupov, E. L., Jawalkar, S. S., Jo, H. S., Kalantarians, N., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., King, P. M., Klein, A., Klein, F. J., Klimenko, A., Kubarovsky, V., Kuleshov, S. V., Kvaltine, N. D., Livingston, K., Lu, H. Y., MacGregor, I . J . D., Mao, Y., Markov, N., McKinnon, B., Mineeva, T., Morrison, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Ni, A., Niccolai, S., Niculescu, I., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Pappalardo, L., Park, K., Park, S., Pasyuk, E., Pereira, S. Anefalos, Pisano, S., Pozdniakov, S., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B. A., Ricco, G., Rimal, D., Ripani, M., Rosner, G., Rossi, P., Sabatie, F., Saini, M. S., Salgado, C., Schott, D., Schumacher, R. A., Seder, E., Sharabian, Y. G., Sober, D. I., Sokhan, D., Stepanyan, S., Stepanyan, S. S., Stoler, P., Strauch, S., Taiuti, M., Tang, W., Ungaro, M., Vineyard, M. F., Voutier, E., Watts, D. P., Weinstein, L. B., Weygand, D. P., Wood, M. H., Zana, L., and Zhao, B.
Subjects: Nuclear Experiment, High Energy Physics - Experiment
Abstract: We report on the first measurement of the F2 structure function of the neutron from semi-inclusive scattering of electrons from deuterium, with low-momentum protons detected in the backward hemisphere. Restricting the momentum of the spectator protons to < 100 MeV and their angles to < 100 degrees relative to the momentum transfer allows an interpretation of the process in terms of scattering from nearly on-shell neutrons. The F2n data collected cover the nucleon resonance and deep-inelastic regions over a wide range of Bjorken x for 0.65 < Q2 < 4.52 GeV2, with uncertainties from nuclear corrections estimated to be less than a few percent. These measurements provide the first determination of the neutron to proton structure function ratio F2n/F2p at 0.2 < x < 0.8 with little uncertainty due to nuclear effects., Comment: 6 pages, 3 pages
Published: 2011
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