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1. Measurement of neutron and proton analyzing powers on $C$, $CH$, $CH_2$ and $Cu$ targets in the momentum region 3-4.2 GeV/c

Author

Basilev, S. N., Bushuev, Yu. P., Gavrishchuk, O. P., Glagolev, V. V., Kirillov, D. A., Kostayeva, N. V., Kovalenko, A. D., Legostaeva, K. S., Livanov, A. N., Philippov, I. A., Piskunov, N. M., Povtoreiko, A. A., Rukoyatkin, P. A., Shindin, R. A., Shipunov, A. V., Shutov, A. V., Sitnik, I. M., Slepnev, V. M., Slepnev, I. V., Terletskiy, A. V., Hamilton, K., Montgomery, R., Annand, J. R. M., Marchand, D., Wang, Y., Tomasi-Gustafsson, E., Perdrisat, C. F., Punjabi, V., Martinska, G., Urban, J., and Mušinsky, J.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

The analyzing powers for proton elastic scattering ($\vec p A\to pX$) and neutron charge exchange ($\vec n A\to p X$) reactions on nuclei have been measured on $ C$, $CH$, $CH_2$ and $Cu$ targets at incident neutron momenta 3.0 - 4.2 GeV/c by detecting one charged particle in forward direction. The polarized neutron measurements are the first of their kind. The experiment was performed using the Nuclotron accelerator in JINR Dubna, where polarized neutrons and protons were obtained from breakup of a polarized deuteron beam which has a maximum momentum of 13 GeV/c. The polarimeter ALPOM2 was used to obtain the analyzing power dependence on the transverse momentum of the final-state nucleon. These data have been used to estimate the figure of merit of a proposed experiment at Jefferson Laboratory to measure the recoiling neutron polarization in the quasi-elastic $^2H(\vec e,e'\vec n)$ reaction, which yields information on the charge and magnetic elastic form factors of the neutron., Comment: 14 pages and 19 figures

Published
2019
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2. Polarization Transfer Observables in Elastic Electron Proton Scattering at $Q^2 = $2.5, 5.2, 6.8, and 8.5 GeV$^2$

Author

Puckett, A. J. R., Brash, E. J., Jones, M. K., Luo, W., Meziane, M., Pentchev, L., Perdrisat, C. F., Punjabi, V., Wesselmann, F. R., Afanasev, A., Ahmidouch, A., Albayrak, I., Aniol, K. A., Arrington, J., Asaturyan, A., Baghdasaryan, H., Benmokhtar, F., Bertozzi, W., Bimbot, L., Bosted, P., Boeglin, W., Butuceanu, C., Carter, P., Chernenko, S., Christy, E., Commisso, M., Cornejo, J. C., Covrig, S., Danagoulian, S., Daniel, A., Davidenko, A., Day, D., Dhamija, S., Dutta, D., Ent, R., Frullani, S., Fenker, H., Frlez, E., Garibaldi, F., Gaskell, D., Gilad, S., Gilman, R., Goncharenko, Y., Hafidi, K., Hamilton, D., Higinbotham, D. W., Hinton, W., Horn, T., Hu, B., Huang, J., Huber, G. M., Jensen, E., Keppel, C., Khandaker, M., King, P., Kirillov, D., Kohl, M., Kravtsov, V., Kumbartzki, G., Li, Y., Mamyan, V., Margaziotis, D. J., Marsh, A., Matulenko, Y., Maxwell, J., Mbianda, G., Meekins, D., Melnik, Y., Miller, J., Mkrtchyan, A., Mkrtchyan, H., Moffit, B., Moreno, O., Mulholland, J., Narayan, A., Nedev, S., Nuruzzaman, Piasetzky, E., Pierce, W., Piskunov, N. M., Prok, Y., Ransome, R. D., Razin, D. S., Reimer, P., Reinhold, J., Rondon, O., Shabestari, M., Shahinyan, A., Shestermanov, K., Sirca, S., Sitnik, I., Smykov, L., Smith, G., Solovyev, L., Solvignon, P., Subedi, R., Tomasi-Gustafsson, E., Vasiliev, A., Veilleux, M., Wojtsekhowski, B. B., Wood, S., Ye, Z., Zanevsky, Y., Zhang, X., Zhang, Y., Zheng, X., and Zhu, L.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

The GEp-III and GEp-2$\gamma$ experiments were carried out in Jefferson Lab's (JLab's) Hall C from 2007-2008, to extend the knowledge of $G_E^p/G_M^p$ to the highest practically achievable $Q^2$ and to search for effects beyond the Born approximation in polarization transfer observables of elastic $\vec{e}p$ scattering. This article reports an expanded description of the common experimental apparatus and data analysis procedure, and the results of a final reanalysis of the data from both experiments, including the previously unpublished results of the full-acceptance data of the GEp-2$\gamma$ experiment. The Hall C High Momentum Spectrometer detected and measured the polarization of protons recoiling elastically from collisions of JLab's polarized electron beam with a liquid hydrogen target. A large-acceptance electromagnetic calorimeter detected the elastically scattered electrons in coincidence to suppress inelastic backgrounds. The final GEp-III data are largely unchanged relative to the originally published results. The statistical uncertainties of the final GEp-2$\gamma$ data are significantly reduced at $\epsilon = 0.632$ and $0.783$ relative to the original publication. The decrease with $Q^2$ of $G_E^p/G_M^p$ continues to $Q^2 = 8.5$ GeV$^2$, but at a slowing rate relative to the approximately linear decrease observed in earlier Hall A measurements. At $Q^2 = 2.5$ GeV$^2$, the proton form factor ratio $G_E^p/G_M^p$ shows no statistically significant $\epsilon$-dependence, as expected in the Born approximation. The ratio $P_\ell/P_\ell^{Born}$ of the longitudinal polarization transfer component to its Born value shows an enhancement of roughly 1.4\% at $\epsilon = 0.783$ relative to $\epsilon = 0.149$, with $\approx 1.9\sigma$ significance based on the total uncertainty, implying a similar effect in the transverse component $P_t$ that cancels in the ratio $R$., Comment: 44 pages, 28 figures. Archival publication for the GEp-III and GEp-2gamma experiments that ran in Jefferson Lab's experimental Hall C from October, 2007 to June, 2008. v2: final manuscript as accepted by PRC. v3: Replaced figures 13 and 19 with corrected versions from published Erratum. Also made minor corrections to the text and to Table XI reflecting the corrections in the published Erratum

Published
2017
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3. Technical Supplement to 'Polarization Transfer Observables in Elastic Electron-Proton Scattering at Q$^2$ = 2.5, 5.2, 6.8, and 8.5 GeV$^2$'

Author

Puckett, A. J. R., Brash, E. J., Jones, M. K., Luo, W., Meziane, M., Pentchev, L., Perdrisat, C. F., Punjabi, V., Wesselmann, F. R., Ahmidouch, A., Albayrak, I., Aniol, K. A., Arrington, J., Asaturyan, A., Baghdasaryan, H., Benmokhtar, F., Bertozzi, W., Bimbot, L., Bosted, P., Boeglin, W., Butuceanu, C., Carter, P., Chernenko, S., Christy, E., Commisso, M., Cornejo, J. C., Covrig, S., Danagoulian, S., Daniel, A., Davidenko, A., Day, D., Dhamija, S., Dutta, D., Ent, R., Frullani, S., Fenker, H., Frlez, E., Garibaldi, F., Gaskell, D., Gilad, S., Gilman, R., Goncharenko, Y., Hafidi, K., Hamilton, D., Higinbotham, D. W., Hinton, W., Horn, T., Hu, B., Huang, J., Huber, G. M., Jensen, E., Keppel, C., Khandaker, M., King, P., Kirillov, D., Kohl, M., Kravtsov, V., Kumbartzki, G., Li, Y., Mamyan, V., Margaziotis, D. J., Marsh, A., Matulenko, Y., Maxwell, J., Mbianda, G., Meekins, D., Melnik, Y., Miller, J., Mkrtchyan, A., Mkrtchyan, H., Moffit, B., Moreno, O., Mulholland, J., Narayan, A., Nedev, S., Nurruzzaman, Piasetzky, E., Pierce, W., Piskunov, N. M., Prok, Y., Ransome, R. D., Razin, D. S., Reimer, P., Reinhold, J., Rondon, O., Shabestari, M., Shahinyan, A., Shestermanov, K., Sirca, S., Sitnik, I., Smykov, L., Smith, G., Solovyev, L., Solvignon, P., Subedi, R., Tomasi-Gustafsson, E., Vasiliev, A., Veilleux, M., Wojtsekhowski, B. B., Wood, S., Ye, Z., Zanevsky, Y., Zhang, X., Zhang, Y., Zheng, X., and Zhu, L.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

The GEp-III and GEp-2$\gamma$ experiments, carried out in Jefferson Lab's Hall C from 2007-2008, consisted of measurements of polarization transfer in elastic electron-proton scattering at momentum transfers of $Q^2 = 2.5, 5.2, 6.8,$ and $8.54$ GeV$^2$. These measurements were carried out to improve knowledge of the proton electromagnetic form factor ratio $R = \mu_p G_E^p/G_M^p$ at large values of $Q^2$ and to search for effects beyond the Born approximation in polarization transfer observables at $Q^2 = 2.5$ GeV$^2$. The final results of both experiments were reported in a recent archival publication. A full reanalysis of the data from both experiments was carried out in order to reduce the systematic and, for the GEp-2$\gamma$ experiment, statistical uncertainties. This technical note provides additional details of the final analysis omitted from the main publication, including the final evaluation of the systematic uncertainties., Comment: 33 pages, 33 figures. v3 = Final manuscript as accepted for publication in Nuclear Instruments and Methods Section A (in press)

Published
2017
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4. Technical supplement to “Polarization transfer observables in elastic electron-proton scattering at Q 2 = 2 . 5 , 5 . 2 , 6 . 8 and 8 . 5 GeV 2 ”

Author

Puckett, AJR, Brash, EJ, Jones, MK, Luo, W, Meziane, M, Pentchev, L, Perdrisat, CF, Punjabi, V, Wesselmann, FR, Afanasev, A, Ahmidouch, A, Albayrak, I, Aniol, KA, Arrington, J, Asaturyan, A, Baghdasaryan, H, Benmokhtar, F, Bertozzi, W, Bimbot, L, Bosted, P, Boeglin, W, Butuceanu, C, Carter, P, Chernenko, S, Christy, ME, Cornejo, JC, Covrig, S, Danagoulian, S, Daniel, A, Davidenko, A, Day, D, Dhamija, S, Dutta, D, Ent, R, Frullani, S, Fenker, H, Frlez, E, Garibaldi, F, Gaskell, D, Gilad, S, Gilman, R, Goncharenko, Y, Hafidi, K, Hamilton, D, Higinbotham, DW, Hinton, W, Horn, T, Hu, B, Huang, J, Huber, GM, Jensen, E, Keppel, C, Khandaker, M, King, P, Kirillov, D, Kohl, M, Kravtsov, V, Kumbartzki, G, Li, Y, Mamyan, V, Margaziotis, DJ, Marsh, A, Matulenko, Y, Maxwell, J, Mbianda, G, Meekins, D, Melnik, Y, Miller, J, Mkrtchyan, A, Mkrtchyan, H, Moffit, B, Moreno, O, Mulholland, J, Narayan, A, Nedev, S, Nuruzzaman, Piasetzky, E, Pierce, W, Piskunov, NM, Prok, Y, Ransome, RD, Razin, DS, Reimer, P, Reinhold, J, Rondon, O, Shabestari, M, Shahinyan, A, Shestermanov, K, Širca, S, Sitnik, I, Smykov, L, Smith, G, Solovyev, L, Solvignon, P, Subedi, R, Tomasi-Gustafsson, E, Vasiliev, A, Veilleux, M, Wojtsekhowski, BB, and Wood, S

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, Proton form factors, Magnetic spectrometer, Electromagnetic calorimeter, Proton polarimeter, Polarization transfer method, Spin transport, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences, Nuclear & Particles Physics, Nuclear and plasma physics
Abstract

The GEp-III and GEp-2γ experiments, carried out in Jefferson Lab's Hall C from 2007–2008, consisted of measurements of polarization transfer in elastic electron–proton scattering at momentum transfers of Q2=2.5,5.2,6.8, and 8.54 GeV 2. These measurements were carried out to improve knowledge of the proton electromagnetic form factor ratio R=μpGEp∕GMp at large values of Q2 and to search for effects beyond the Born approximation in polarization transfer observables at Q2=2.5GeV2. The final results of both experiments were reported in a recent archival publication. A full reanalysis of the data from both experiments was carried out in order to reduce the systematic and, for the GEp-2γ experiment, statistical uncertainties. This technical note provides additional details of the final analysis omitted from the main publication, including the final evaluation of the systematic uncertainties.

Published
2018

5. Technical supplement to “Polarization transfer observables in elastic electron-proton scattering at Q2=2.5,5.2,6.8 and 8.5GeV2”

Author

Puckett, AJR, Brash, EJ, Jones, MK, Luo, W, Meziane, M, Pentchev, L, Perdrisat, CF, Punjabi, V, Wesselmann, FR, Afanasev, A, Ahmidouch, A, Albayrak, I, Aniol, KA, Arrington, J, Asaturyan, A, Baghdasaryan, H, Benmokhtar, F, Bertozzi, W, Bimbot, L, Bosted, P, Boeglin, W, Butuceanu, C, Carter, P, Chernenko, S, Christy, ME, Cornejo, JC, Covrig, S, Danagoulian, S, Daniel, A, Davidenko, A, Day, D, Dhamija, S, Dutta, D, Ent, R, Frullani, S, Fenker, H, Frlez, E, Garibaldi, F, Gaskell, D, Gilad, S, Gilman, R, Goncharenko, Y, Hafidi, K, Hamilton, D, Higinbotham, DW, Hinton, W, Horn, T, Hu, B, Huang, J, Huber, GM, Jensen, E, Keppel, C, Khandaker, M, King, P, Kirillov, D, Kohl, M, Kravtsov, V, Kumbartzki, G, Li, Y, Mamyan, V, Margaziotis, DJ, Marsh, A, Matulenko, Y, Maxwell, J, Mbianda, G, Meekins, D, Melnik, Y, Miller, J, Mkrtchyan, A, Mkrtchyan, H, Moffit, B, Moreno, O, Mulholland, J, Narayan, A, Nedev, S, Nuruzzaman, Piasetzky, E, Pierce, W, Piskunov, NM, Prok, Y, Ransome, RD, Razin, DS, Reimer, P, Reinhold, J, Rondon, O, Shabestari, M, Shahinyan, A, Shestermanov, K, Širca, S, Sitnik, I, Smykov, L, Smith, G, Solovyev, L, Solvignon, P, Subedi, R, Tomasi-Gustafsson, E, Vasiliev, A, Veilleux, M, Wojtsekhowski, BB, and Wood, S

Subjects
Proton form factors, Magnetic spectrometer, Electromagnetic calorimeter, Proton polarimeter, Polarization transfer method, Spin transport, Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences
Abstract

The GEp-III and GEp-2γ experiments, carried out in Jefferson Lab's Hall C from 2007–2008, consisted of measurements of polarization transfer in elastic electron–proton scattering at momentum transfers of Q2=2.5,5.2,6.8, and 8.54 GeV 2. These measurements were carried out to improve knowledge of the proton electromagnetic form factor ratio R=μpGEp∕GMp at large values of Q2 and to search for effects beyond the Born approximation in polarization transfer observables at Q2=2.5GeV2. The final results of both experiments were reported in a recent archival publication. A full reanalysis of the data from both experiments was carried out in order to reduce the systematic and, for the GEp-2γ experiment, statistical uncertainties. This technical note provides additional details of the final analysis omitted from the main publication, including the final evaluation of the systematic uncertainties.

Published
2018

6. Erratum: Polarization transfer observables in elastic electron-proton scattering at Q2=2.5, 5.2, 6.8, and 8.5 GeV2 (Physical Review C (2017) 96 (055203) DOI: 10.1103/PhysRevC.96.055203)

Author

Puckett, AJR, Brash, EJ, Jones, MK, Luo, W, Meziane, M, Pentchev, L, Perdrisat, CF, Punjabi, V, Wesselmann, FR, Afanasev, A, Ahmidouch, A, Albayrak, I, Aniol, KA, Arrington, J, Asaturyan, A, Baghdasaryan, H, Benmokhtar, F, Bertozzi, W, Bimbot, L, Bosted, P, Boeglin, W, Butuceanu, C, Carter, P, Chernenko, S, Christy, ME, Commisso, M, Cornejo, JC, Covrig, S, Danagoulian, S, Daniel, A, Davidenko, A, Day, D, Dhamija, S, Dutta, D, Ent, R, Frullani, S, Fenker, H, Frlez, E, Garibaldi, F, Gaskell, D, Gilad, S, Gilman, R, Goncharenko, Y, Hafidi, K, Hamilton, D, Higinbotham, DW, Hinton, W, Horn, T, Hu, B, Huang, J, Huber, GM, Jensen, E, Keppel, C, Khandaker, M, King, P, Kirillov, D, Kohl, M, Kravtsov, V, Kumbartzki, G, Li, Y, Mamyan, V, Margaziotis, DJ, Marsh, A, Matulenko, Y, Maxwell, J, Mbianda, G, Meekins, D, Melnik, Y, Miller, J, Mkrtchyan, A, Mkrtchyan, H, Moffit, B, Moreno, O, Mulholland, J, Narayan, A, Nedev, S, Nuruzzaman, Piasetzky, E, Pierce, W, Piskunov, NM, Prok, Y, Ransome, RD, Razin, DS, Reimer, P, Reinhold, J, Rondon, O, Shabestari, M, Shahinyan, A, Shestermanov, K, Širca, S, Sitnik, I, Smykov, L, Smith, G, Solovyev, L, Solvignon, P, Subedi, R, Tomasi-Gustafsson, E, Vasiliev, A, Veilleux, M, and Wojtsekhowski, BB

Abstract

Subsequent to the release of our original paper, we discovered in the context of preparing our technical supplement [1] for journal publication that a typographical error had existed in the text file that the analysis program used to construct the beam polarization "database" for both the original analysis, published in Ref. [2], and our final analysis. The electron-beam polarization P e and the analyzing power A y cancel exactly in the ratio R , which is proportional to the ratio P t / P l of the transferred polarization components. On the other hand, the extraction of the relative e dependence of P l / P Born l relies on knowledge of the beam polarization. As such, data taking was interrupted roughly every two days during the GEp - 2 ? experiment to perform invasive measurements of the beam polarization using the Hall C Moller polarimeter [3]. The run range affected by the typographical error was entirely contained within the data collected at Q 2 = 2.5 GeV 2 with a beam energy of E e = 3.680 GeV during January 2008. The data from this configuration were combined with the data collected at E e = 3.548 GeV due to the nearly complete overlap of these two settings in terms of Q 2 and e acceptance. It is worth remarking that this typographical error went unnoticed for so long because it only affected a small fraction of the data (less than half of the combined data for ? e ? = 0.790 ) and the difference between the actually assigned beam polarization and the polarization that should have been assigned was comparable in magnitude to the point-to-point systematic uncertainty of the measurement itself. As such, its effect did not show up in various diagnostic plots and statistical tests, such as the time stability of the extracted P l / P Born l ratio. The data for both E e = 3.548 and E e = 3.680 GeV were reprocessed using the corrected beam polarizations to determine the effect of the typographical error on the combined physics results at ? e ? = 0.790 . Because the value of P e cancels in the ratio R , changes in the assumed beam polarization can only affect the results for R via statistical fluctuations due to changes in the relative weighting of different run ranges in the unbinned maximum-likelihood estimators for R . These effects are negligible on the scale of both the statistical and the systematic uncertainties of the data. More noticeable changes are expected in the ratio P l / P Born l since the extracted value of P l is inversely proportional to the assumed value of P e . Table I shows the effect of the corrected beam polarization database on the polarization transfer observables for the combined data for the ? e ? = 0.790 setting, the only measurement affected by the typographical error. The analyzing power did not need to be recalibrated since it was determined using the ? e ? = 0.153 data, which were not affected by the typographical error. As expected, the change in the ratio R is negligible. The value of P Born l , which is computed event by event from the global fit described in the Appendix of the original paper and does not depend on P e , is also unchanged. The magnitudes of P t , P l , and P l / P Born l are reduced by a common multiplicative factor, reflecting the fact that the beam polarization had been underestimated for the run range affected by the typographical error. The most important result of the corrected analysis is that the ratio P l / P Born l has decreased by 0.0024 from 1.0167 to 1.0143, a change comparable in magnitude to the statistical uncertainty but small compared to the total and point-to-point systematic uncertainties. The P l / P Born l result for the original publication [2] would be reduced by the same multiplicative factor as the final result. The physics conclusions of both publications are not materially changed by this correction. (Table Presented). (Figure Presented).

Published
2018

7. Erratum: Polarization transfer observables in elastic electron-proton scattering at Q2=2.5, 5.2, 6.8, and 8.5GeV2 [Phys. Rev. C 96, 055203 (2017)]

Author

Puckett, AJR, Brash, EJ, Jones, MK, Luo, W, Meziane, M, Pentchev, L, Perdrisat, CF, Punjabi, V, Wesselmann, FR, Afanasev, A, Ahmidouch, A, Albayrak, I, Aniol, KA, Arrington, J, Asaturyan, A, Baghdasaryan, H, Benmokhtar, F, Bertozzi, W, Bimbot, L, Bosted, P, Boeglin, W, Butuceanu, C, Carter, P, Chernenko, S, Christy, ME, Commisso, M, Cornejo, JC, Covrig, S, Danagoulian, S, Daniel, A, Davidenko, A, Day, D, Dhamija, S, Dutta, D, Ent, R, Frullani, S, Fenker, H, Frlez, E, Garibaldi, F, Gaskell, D, Gilad, S, Gilman, R, Goncharenko, Y, Hafidi, K, Hamilton, D, Higinbotham, DW, Hinton, W, Horn, T, Hu, B, Huang, J, Huber, GM, Jensen, E, Keppel, C, Khandaker, M, King, P, Kirillov, D, Kohl, M, Kravtsov, V, Kumbartzki, G, Li, Y, Mamyan, V, Margaziotis, DJ, Marsh, A, Matulenko, Y, Maxwell, J, Mbianda, G, Meekins, D, Melnik, Y, Miller, J, Mkrtchyan, A, Mkrtchyan, H, Moffit, B, Moreno, O, Mulholland, J, Narayan, A, Nedev, S, Nuruzzaman, Piasetzky, E, Pierce, W, Piskunov, NM, Prok, Y, Ransome, RD, Razin, DS, Reimer, P, Reinhold, J, Rondon, O, Shabestari, M, Shahinyan, A, Shestermanov, K, Širca, S, Sitnik, I, Smykov, L, Smith, G, Solovyev, L, Solvignon, P, Subedi, R, Tomasi-Gustafsson, E, Vasiliev, A, Veilleux, M, and Wojtsekhowski, BB

Subjects
Physical Sciences, Classical Physics, Nuclear and plasma physics
Abstract

Subsequent to the release of our original paper, we discovered in the context of preparing our technical supplement [1] for journal publication that a typographical error had existed in the text file that the analysis program used to construct the beam polarization "database" for both the original analysis, published in Ref. [2], and our final analysis. The electron-beam polarization P e and the analyzing power A y cancel exactly in the ratio R , which is proportional to the ratio P t / P l of the transferred polarization components. On the other hand, the extraction of the relative e dependence of P l / P Born l relies on knowledge of the beam polarization. As such, data taking was interrupted roughly every two days during the GEp - 2 ? experiment to perform invasive measurements of the beam polarization using the Hall C Moller polarimeter [3]. The run range affected by the typographical error was entirely contained within the data collected at Q 2 = 2.5 GeV 2 with a beam energy of E e = 3.680 GeV during January 2008. The data from this configuration were combined with the data collected at E e = 3.548 GeV due to the nearly complete overlap of these two settings in terms of Q 2 and e acceptance. It is worth remarking that this typographical error went unnoticed for so long because it only affected a small fraction of the data (less than half of the combined data for ? e ? = 0.790 ) and the difference between the actually assigned beam polarization and the polarization that should have been assigned was comparable in magnitude to the point-to-point systematic uncertainty of the measurement itself. As such, its effect did not show up in various diagnostic plots and statistical tests, such as the time stability of the extracted P l / P Born l ratio. The data for both E e = 3.548 and E e = 3.680 GeV were reprocessed using the corrected beam polarizations to determine the effect of the typographical error on the combined physics results at ? e ? = 0.790 . Because the value of P e cancels in the ratio R , changes in the assumed beam polarization can only affect the results for R via statistical fluctuations due to changes in the relative weighting of different run ranges in the unbinned maximum-likelihood estimators for R . These effects are negligible on the scale of both the statistical and the systematic uncertainties of the data. More noticeable changes are expected in the ratio P l / P Born l since the extracted value of P l is inversely proportional to the assumed value of P e . Table I shows the effect of the corrected beam polarization database on the polarization transfer observables for the combined data for the ? e ? = 0.790 setting, the only measurement affected by the typographical error. The analyzing power did not need to be recalibrated since it was determined using the ? e ? = 0.153 data, which were not affected by the typographical error. As expected, the change in the ratio R is negligible. The value of P Born l , which is computed event by event from the global fit described in the Appendix of the original paper and does not depend on P e , is also unchanged. The magnitudes of P t , P l , and P l / P Born l are reduced by a common multiplicative factor, reflecting the fact that the beam polarization had been underestimated for the run range affected by the typographical error. The most important result of the corrected analysis is that the ratio P l / P Born l has decreased by 0.0024 from 1.0167 to 1.0143, a change comparable in magnitude to the statistical uncertainty but small compared to the total and point-to-point systematic uncertainties. The P l / P Born l result for the original publication [2] would be reduced by the same multiplicative factor as the final result. The physics conclusions of both publications are not materially changed by this correction. (Table Presented). (Figure Presented).

Published
2018

8. Polarization transfer observables in elastic electron-proton scattering at Q2=2.5, 5.2, 6.8, and 8.5 GeV2 POLARIZATION TRANSFER OBSERVABLES in ELASTIC ... A. J. R. PUCKETT et al.

Author

Puckett, AJR, Brash, EJ, Jones, MK, Luo, W, Meziane, M, Pentchev, L, Perdrisat, CF, Punjabi, V, Wesselmann, FR, Afanasev, A, Ahmidouch, A, Albayrak, I, Aniol, KA, Arrington, J, Asaturyan, A, Baghdasaryan, H, Benmokhtar, F, Bertozzi, W, Bimbot, L, Bosted, P, Boeglin, W, Butuceanu, C, Carter, P, Chernenko, S, Christy, ME, Commisso, M, Cornejo, JC, Covrig, S, Danagoulian, S, Daniel, A, Davidenko, A, Day, D, Dhamija, S, Dutta, D, Ent, R, Frullani, S, Fenker, H, Frlez, E, Garibaldi, F, Gaskell, D, Gilad, S, Gilman, R, Goncharenko, Y, Hafidi, K, Hamilton, D, Higinbotham, DW, Hinton, W, Horn, T, Hu, B, Huang, J, Huber, GM, Jensen, E, Keppel, C, Khandaker, M, King, P, Kirillov, D, Kohl, M, Kravtsov, V, Kumbartzki, G, Li, Y, Mamyan, V, Margaziotis, DJ, Marsh, A, Matulenko, Y, Maxwell, J, Mbianda, G, Meekins, D, Melnik, Y, Miller, J, Mkrtchyan, A, Mkrtchyan, H, Moffit, B, Moreno, O, Mulholland, J, Narayan, A, Nedev, S, Nuruzzaman, Piasetzky, E, Pierce, W, Piskunov, NM, Prok, Y, Ransome, RD, Razin, DS, Reimer, P, Reinhold, J, Rondon, O, Shabestari, M, Shahinyan, A, Shestermanov, K, Širca, S, Sitnik, I, Smykov, L, Smith, G, Solovyev, L, Solvignon, P, Subedi, R, Tomasi-Gustafsson, E, Vasiliev, A, Veilleux, M, and Wojtsekhowski, BB

Abstract

Background: Interest in the behavior of nucleon electromagnetic form factors at large momentum transfers has steadily increased since the discovery, using polarization observables, of the rapid decrease of the ratio GEp/GMp of the proton's electric and magnetic form factors for momentum transfers Q21 GeV2, in strong disagreement with previous extractions of this ratio using the traditional Rosenbluth separation technique. Purpose: The GEp-III and GEp-2γ experiments were carried out in Jefferson Laboratory's (JLab's) Hall C from 2007 to 2008, to extend the knowledge of GEp/GMp to the highest practically achievable Q2 given the maximum beam energy of 6 GeV and to search for effects beyond the Born approximation in polarization transfer observables of elastic ∫ - p scattering. This article provides an expanded description of the common experimental apparatus and data analysis procedures, and reports the results of a final reanalysis of the data from both experiments, including the previously unpublished results of the full-acceptance dataset of the GEp-2γ experiment. Methods: Polarization transfer observables in elastic ∫ - p→∫ - scattering were measured at central Q2 values of 2.5, 5.2, 6.8, and 8.54 GeV2. At Q2=2.5GeV2, data were obtained for central values of the virtual photon polarization parameter ϵ of 0.149, 0.632, and 0.783. The Hall C High Momentum Spectrometer detected and measured the polarization of protons recoiling elastically from collisions of JLab's polarized electron beam with a liquid hydrogen target. A large-acceptance electromagnetic calorimeter detected the elastically scattered electrons in coincidence to suppress inelastic backgrounds. Results: The final GEp-III data are largely unchanged relative to the originally published results. The statistical uncertainties of the final GEp-2γ data are significantly reduced at ϵ=0.632 and 0.783 relative to the original publication. Conclusions: The final GEp-III results show that the decrease with Q2 of GEp/GMp continues to Q2=8.5GeV2, but at a slowing rate relative to the approximately linear decrease observed in earlier Hall A measurements. At Q2=8.5GeV2, GEp/GMp remains positive but is consistent with zero. At Q2=2.5GeV2, GEp/GMp derived from the polarization component ratio R-Pt/P shows no statistically significant ϵ dependence, as expected in the Born approximation. On the other hand, the ratio P""/P""Born of the longitudinal polarization transfer component to its Born value shows an enhancement of roughly 1.7% at ϵ=0.783 relative to ϵ=0.149, with ≈2.2σ significance based on the total uncertainty, implying a similar effect in the transverse component Pt that cancels in the ratio R.

Published
2017

9. Polarization components in $\pi^{0}$ photoproduction at photon energies up to 5.6 GeV

Author

Luo, W., Brash, E. J., Gilman, R., Jones, M. K., Meziane, M., Pentchev, L., Perdrisat, C. F., Puckett, A. J. R., Punjabi, V., Wesselmann, F. R., Ahmidouch, A., Albayrak, I., Aniol, K. A., Arrington, J., Asaturyan, A., Ates, O., Baghdasaryan, H., Benmokhtar, F., Bertozzi, W., Bimbot, L., Bosted, P., Boeglin, W., Butuceanu, C., Carter, P., Chernenko, S., Christy, M. E., Commisso, M., Cornejo, J. C., Covrig, S., Danagoulian, S., Daniel, A., Davidenko, A., Day, D., Dhamija, S., Dutta, D., Ent, R., Frullani, S., Fenker, H., Frlez, E., Garibaldi, F., Gaskell, D., Gilad, S., Goncharenko, Y., Hafidi, K., Hamilton, D., Higinbotham, D. W., Hinton, W., Horn, T., Hu, B., Huang, J., Huber, G. M., Jensen, E., Kang, H., Keppel, C., Khandaker, M., King, P., Kirillov, D., Kohl, M., Kravtsov, V., Kumbartzki, G., Li, Y., Mamyan, V., Margaziotis, D. J., Markowitz, P., Marsh, A., Matulenko, Y., Maxwell, J., Mbianda, G., Meekins, D., Melnik, Y., Miller, J., Mkrtchyan, A., Mkrtchyan, H., Moffit, B., Moreno, O., Mulholland, J., Narayan, A., Nuruzzaman, Nedev, S., Piasetzky, E., Pierce, W., Piskunov, N. M., Prok, Y., Ransome, R. D., Razin, D. S., Reimer, P. E., Reinhold, J., Rondon, O., Shabestari, M., Shahinyan, A., Shestermanov, K., Sirca, S., Sitnik, I., Smykov, L., Smith, G., Solovyev, L., Solvignon, P., Strakovsky, I. I., Subedi, R., Suleiman, R., Tomasi-Gustafsson, E., Vasiliev, A., Veilleux, M., Wood, S., Ye, Z., Zanevsky, Y., Zhang, X., Zhang, Y., Zheng, X., and Zhu, L.

Subjects
Nuclear Experiment
Abstract

We present new data for the polarization observables of the final state proton in the $^{1}H(\vec{\gamma},\vec{p})\pi^{0}$ reaction. These data can be used to test predictions based on hadron helicity conservation (HHC) and perturbative QCD (pQCD). These data have both small statistical and systematic uncertainties, and were obtained with beam energies between 1.8 and 5.6 GeV and for $\pi^{0}$ scattering angles larger than 75$^{\circ}$ in center-of-mass (c.m.) frame. The data extend the polarization measurements data base for neutral pion photoproduction up to $E_{\gamma}=5.6 GeV$. The results show non-zero induced polarization above the resonance region. The polarization transfer components vary rapidly with the photon energy and $\pi^{0}$ scattering angle in c.m. frame. This indicates that HHC does not hold and that the pQCD limit is still not reached in the energy regime of this experiment., Comment: 6 pages and 2 figures

Published
2011
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10. Upper limits for a narrow resonance in the reaction p + p -> K^+ + (Lambda p)

Author

Budzanowski, A., Chatterjee, A., Clement, H., Hawranek, P., Hinterberger, F., Jahn, R., Joosten, R., Kilian, K., Kirillov, Da., Kirillov, Di., Kliczewski, S., Kolev, D., Kravcikova, M., Lesiak, M., Machner, H., Magiera, A., Martinska, G., Piskunov, N., Protic, D., Ritman, J., von Rossen, P., Roy, J., Sibirtsev, A., Sitnik, I., Siudak, R., Tsenov, R., Ulbrich, K., Urban, J., and Wagner, G. J.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

The reaction pp -> K^+ + (Lambda p) has been measured at T_p = 1.953 GeV and \Theta = 0 deg with a high missing mass resolution in order to study the Lambda p final state interaction. Narrow S = -1 resonances predicted by bag model calculations are not visible in the missing mass spectrum. Small structures observed in a previous experiment are not confirmed. Upper limits for the production cross section of a narrow resonance are deduced for missing masses between 2058 and 2105 MeV/c^2., Comment: 8 pages, 5 figures

Published
2011
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11. Final Analysis of Proton Form Factor Ratio Data at $\mathbf{Q^2 = 4.0}$, 4.8 and 5.6 GeV$\mathbf{^2}$

Author

Puckett, A. J. R., Brash, E. J., Gayou, O., Jones, M. K., Pentchev, L., Perdrisat, C. F., Punjabi, V., Aniol, K. A., Averett, T., Benmokhtar, F., Bertozzi, W., Bimbot, L., Calarco, J. R., Cavata, C., Chai, Z., Chang, C. -C., Chang, T., Chen, J. P., Chudakov, E., De Leo, R., Dieterich, S., Endres, R., Epstein, M. B., Escoffier, S., Fonvieille, K. G. Fissum. H., Frullani, S., Gao, J., Garibaldi, F., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Hansen, J. -O., Higinbotham, D., Huber, G. M., Iodice, M., de Jager, C. W., Jiang, X., Khandaker, M., Kozlov, S., Kramer, K. M., Kumbartzki, G., LeRose, J. J., Lhuillier, D., Lindgren, R. A., Liyanage, N., Lolos, G. J., Margaziotis, D. J., Marie, F., Markowitz, P., McCormick, K., Michaels, R., Milbrath, B. D., Nanda, S. K., Neyret, D., Piskunov, N. M., Ransome, R. D., Raue, B. A., Roché, R., Rvachev, M., Saha, A., Salgado, C., Sirca, S., Sitnik, I., Strauch, S., Todor, L., Tomasi-Gustafsson, E., Urciuoli, G. M., Voskanyan, H., Wijesooriya, K., Wojtsekhowski, B. B., Zheng, X., and Zhu, L.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

Precise measurements of the proton electromagnetic form factor ratio $R = \mu_p G_E^p/G_M^p$ using the polarization transfer method at Jefferson Lab have revolutionized the understanding of nucleon structure by revealing the strong decrease of $R$ with momentum transfer $Q^2$ for $Q^2 \gtrsim 1$ GeV$^2$, in strong disagreement with previous extractions of $R$ from cross section measurements. In particular, the polarization transfer results have exposed the limits of applicability of the one-photon-exchange approximation and highlighted the role of quark orbital angular momentum in the nucleon structure. The GEp-II experiment in Jefferson Lab's Hall A measured $R$ at four $Q^2$ values in the range 3.5 GeV$^2 \le Q^2 \le 5.6$ GeV$^2$. A possible discrepancy between the originally published GEp-II results and more recent measurements at higher $Q^2$ motivated a new analysis of the GEp-II data. This article presents the final results of the GEp-II experiment, including details of the new analysis, an expanded description of the apparatus and an overview of theoretical progress since the original publication. The key result of the final analysis is a systematic increase in the results for $R$, improving the consistency of the polarization transfer data in the high-$Q^2$ region. This increase is the result of an improved selection of elastic events which largely removes the systematic effect of the inelastic contamination, underestimated by the original analysis., Comment: 30 pages, 17 figures, 4 tables. Final version to appear in Phys. Rev. C

Published
2011
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12. Search for effects beyond the Born approximation in polarization transfer observables in $\vec{e}p$ elastic scattering

Author

Meziane, M., Brash, E. J., Gilman, R., Jones, M. K., Luo, W., Pentchev, L., Perdrisat, C. F., Puckett, A. J. R., Punjabi, V., Wesselmann, F. R., Ahmidouch, A., Albayrak, I., Aniol, K. A., Arrington, J., Asaturyan, A., Ates, O., Baghdasaryan, H., Benmokhtar, F., Bertozzi, W., Bimbot, L., Bosted, P., Boeglin, W., Butuceanu, C., Carter, P., Chernenko, S., Christy, E., Commisso, M., Cornejo, J. C., Covrig, S., Danagoulian, S., Daniel, A., Davidenko, A., Day, D., Dhamija, S., Dutta, D., Ent, R., Frullani, S., Fenker, H., Frlez, E., Garibaldi, F., Gaskell, D., Gilad, S., Goncharenko, Y., Hafidi, K., Hamilton, D., Higinbotham, D. W., Hinton, W., Horn, T., Hu, B., Huang, J., Huber, G. M., Jensen, E., Kang, H., Keppel, C., Khandaker, M., King, P., Kirillov, D., Kohl, M., Kravtsov, V., Kumbartzki, G., Li, Y., Mamyan, V., Margaziotis, D. J., Markowitz, P., Marsh, A., Matulenko, Y., Maxwell, J., Mbianda, G., Meekins, D., Melnik, Y., Miller, J., Mkrtchyan, A., Mkrtchyan, H., Moffit, B., Moreno, O., Mulholland, J., Narayan, A., Nuruzzaman, Nedev, S., Piasetzky, E., Pierce, W., Piskunov, N. M., Prok, Y., Ransome, R. D., Razin, D. S., Reimer, P. E., Reinhold, J., Rondon, O., Shabestari, M., Shahinyan, A., Shestermanov, K., Sirca, S., Sitnik, I., Smykov, L., Smith, G., Solovyev, L., Solvignon, P., Subedi, R., Suleiman, R., Tomasi-Gustafsson, E., Vasiliev, A., Vanderhaeghen, M., Veilleux, M., Wojtsekhowski, B. B., Wood, S., Ye, Z., Zanevsky, Y., Zhang, X., Zhang, Y., Zheng, X., and Zhu, L.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton electric to magnetic form factor ratio, $G_{E}/G_{M}$, obtained separately from cross section and polarization transfer measurements. One possible explanation for this difference is a two-photon-exchange (TPEX) contribution. In an effort to search for effects beyond the one-photon-exchange or Born approximation, we report measurements of polarization transfer observables in the elastic $H(\vec{e},e'\vec{p})$ reaction for three different beam energies at a fixed squared momentum transfer $Q^2 = 2.5$ GeV$^2$, spanning a wide range of the virtual photon polarization parameter, $\epsilon$. From these measured polarization observables, we have obtained separately the ratio $R$, which equals $\mu_p G_{E}/G_{M}$ in the Born approximation, and the longitudinal polarization transfer component $P_\ell$, with statistical and systematic uncertainties of $\Delta R \approx \pm 0.01 \mbox{(stat)} \pm 0.013 \mbox{(syst)}$ and $\Delta P_\ell/P^{Born}_{\ell} \approx \pm 0.006 \mbox{(stat)}\pm 0.01 \mbox{(syst)}$. The ratio $R$ is found to be independent of $\epsilon$ at the 1.5% level, while the $\epsilon$ dependence of $P_\ell$ shows an enhancement of $(2.3 \pm 0.6) %$ relative to the Born approximation at large $\epsilon$.

Published
2010
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13. Study of the $\bm{p+^6}$Li$\bm{\to\eta+^7}$Be reaction 11.3 MeV above threshold

Author

Budzanowski, A., Chatterjee, A., Hawranek, P., Jahn, R., Jha, V., Kilian, K., Kliczewski, S., Kirillov, Da., Kirillov, Di., Kolev, D., Kravcikova, M., Lesiak, M., Lieb, J., Machner, H., Magiera, A., Maier, R., Martinska, G., Piskunov, N., Protić, D., Ritman, J., von Rossen, P., Roy, B. J., Sitnik, I., Siudak, R., Tsenov, R., Urban, J., and Vankova, G.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The cross section for the reaction $p+^6\text{Li}\to\eta+^7\text{Be}$ was measured at an excess energy of 11.28 MeV above threshold by detecting the recoiling $^7$Be nuclei. A dedicated set of focal plane detectors was built for the magnetic spectrograph Big Karl and was used for identification and four momentum measurement of the $^7$Be. A differential cross section of $\frac{d\sigma}{d\Omega}=(0.69\pm{0.20}\text{(stat.)}\pm 0.20\text{(syst.)})\text{nb/sr}$ for the ground state plus the 1/2$^-$ was measured. The result is compared to model calculations., Comment: accepted by Phys. Rev. C as rapid communication

Published
2010
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14. Cross section of the $pp\to K^+\Sigma^+n$ reaction close to threshold

Author

Budzanowski, A., Chatterjee, A., Clement, H., Dorochkevitch, E., Hawranek, P., Hinterberger, F., Jahn, R., Joosten, R., Kilian, K., Kliczewski, S., Kirillov, Da., Kirillov, Di., Kolev, D., Kravcikova, M., Lesiak, M., Magiera, A., Machner, H., Martinska, G., Piskunov, N., Protic, D., Ritman, J., von Rossen, P., Sibirtsev, A., Sitnik, I., Siudak, R., Tsenov, R., Ulbrich, K., Urban, J., and Wagner, G. J.

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

We have measured inclusive data on $K^+$-meson production in $pp$ collisions at COSY J\"ulich close to the hyperon production threshold and determined the hyperon-nucleon invariant mass spectra. The spectra were decomposed into three parts: $\Lambda p$, $\Sigma^0p$ and $\Sigma^+n$. The cross section for the $\Sigma^+n$ channel was found to be much smaller than a previous measurement in that excess energy region. The data together with previous results at higher energies are compatible with a phase space dependence., Comment: accepted by Phys. lett. B some typos corrected

Published
2010
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15. Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio to Q^2 = 8.5 GeV^2

Author

Puckett, A. J. R., Brash, E. J., Jones, M. K., Luo, W., Meziane, M., Pentchev, L., Perdrisat, C. F., Punjabi, V., Wesselmann, F. R., Ahmidouch, A., Albayrak, I., Aniol, K. A., Arrington, J., Asaturyan, A., Baghdasaryan, H., Benmokhtar, F., Bertozzi, W., Bimbot, L., Bosted, P., Boeglin, W., Butuceanu, C., Carter, P., Chernenko, S., Christy, E., Commisso, M., Cornejo, J. C., Covrig, S., Danagoulian, S., Daniel, A., Davidenko, A., Day, D., Dhamija, S., Dutta, D., Ent, R., Frullani, S., Fenker, H., Frlez, E., Garibaldi, F., Gaskell, D., Gilad, S., Gilman, R., Goncharenko, Y., Hafidi, K., Hamilton, D., Higinbotham, D. W., Hinton, W., Horn, T., Hu, B., Huang, J., Huber, G. M., Jensen, E., Keppel, C., Khandaker, M., King, P., Kirillov, D., Kohl, M., Kravtsov, V., Kumbartzki, G., Li, Y., Mamyan, V., Margaziotis, D. J., Marsh, A., Matulenko, Y., Maxwell, J., Mbianda, G., Meekins, D., Melnik, Y., Miller, J., Mkrtchyan, A., Mkrtchyan, H., Moffit, B., Moreno, O., Mulholland, J., Narayan, A., Nedev, S., Nuruzzaman, Piasetzky, E., Pierce, W., Piskunov, N. M., Prok, Y., Ransome, R. D., Razin, D. S., Reimer, P., Reinhold, J., Rondon, O., Shabestari, M., Shahinyan, A., Shestermanov, K., Sirca, S., Sitnik, I., Smykov, L., Smith, G., Solovyev, L., Solvignon, P., Subedi, R., Tomasi-Gustafsson, E., Vasiliev, A., Veilleux, M., Wojtsekhowski, B. B., Wood, S., Ye, Z., Zanevsky, Y., Zhang, X., Zhang, Y., Zheng, X., and Zhu, L.

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

Among the most fundamental observables of nucleon structure, electromagnetic form factors are a crucial benchmark for modern calculations describing the strong interaction dynamics of the nucleon's quark constituents; indeed, recent proton data have attracted intense theoretical interest. In this letter, we report new measurements of the proton electromagnetic form factor ratio using the recoil polarization method, at momentum transfers Q2=5.2, 6.7, and 8.5 GeV2. By extending the range of Q2 for which GEp is accurately determined by more than 50%, these measurements will provide significant constraints on models of nucleon structure in the non-perturbative regime.

Published
2010
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16. High resolution study of the Lambda p final state interaction in the reaction p + p -> K+ + (Lambda p)

Author

Budzanowski, A., Chatterjee, A., Clement, H., Dorochkevitch, E., Hawranek, P., Hinterberger, F., Jahn, R., Joosten, R., Kilian, K., Kliczewski, S., Kirillov, Da., Kirillov, Di., Kolev, D., Kravcikova, M., Lesiak, M., Machner, H., Magiera, A., Martinska, G., Piskunov, N., Ritman, J., von Rossen, P., Roy, B. J., Sibirtsev, A., Sitnik, I., Siudak, R., Tsenov, R., Ulbrich, K., Urban, J., and Wagner, G. J.

Subjects
Nuclear Experiment
Abstract

The reaction pp -> K+ + (Lambda p) was measured at Tp=1.953 GeV and Theta = 0 deg with a high missing mass resolution in order to study the Lambda p final state interaction. The large final state enhancement near the Lambda p threshold can be described using the standard Jost-function approach. The singlet and triplet scattering lengths and effective ranges are deduced by fitting simultaneously the Lambda p invariant mass spectrum and the total cross section data of the free Lambda p scattering., Comment: submitted to Physics Letters B, 10 pages, 3 figures

Published
2010
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17. Cross sections of the $pp\to K^+\Sigma^+n$ reaction close to threshold

Author

The HIRES Collaboration, Budzanowski, A., Chatterjee, A., Clement, H., Dorochkevitch, E., Hawranek, P., Hinterberger, F., Jahn, R., Joosten, R., Kilian, K., Kliczewski, S., Kirilov, Da., Kirillov, Di., Kolev, D., Kravcikova, M., Lesiak, M., Machner, H., Magiera, A., Martinska, G., Piskunov, N., Ritman, J., von Rossen, P., Roy, B. J., Sibirtsev, A., Sitnik, I., Siudak, R., Tsenov, R., Ulbrich, K., Urban, J., and Wagner, G. J.

Subjects
Nuclear Experiment
Abstract

The paper is obsolete

Published
2009

18. Precision measurements of the pp\to \pi^+pn and pp\to \pi^+d reactions: importance of long-range and tensor force effects

Author

Budzanowski, A., Chatterjee, A., Hawranek, P., Jahn, R., Jha, V., Kilian, K., Kirillov, Da., Kirillov, Di., Kliczewski, S., Kolev, D., Kravcikova, M., Lesiak, M., Lieb, J., Machner, H., Magiera, A., Maier, R., Martinska, G., Nedev, S., Niskanen, J. A., Piskunov, N., Protic, D., Ritman, 6 J., von Rossen, P., Roy, B. J., Sitnik, I., Siudak, R., Stein, H. J., Tsenov, R., Urban, J., Vankova, 2 G., and Wilkin, C.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Inclusive measurements of pion production in proton--proton collisions in the forward direction were undertaken at 400 and 600 MeV at COSY using the Big Karl spectrograph. The high resolution in the $\pi^+$ momentum ensured that there was an unambiguous separation of the $pp\to {\pi}^+d/\pi^+pn$ channels. Using these and earlier data, the ratio of the production cross sections could be followed through the $\Delta$ region and compared with the predictions of final state interaction theory. Deviations are strongly influenced by long-range terms in the production operator and the tensor force in the final $pn$ system. These have been investigated in a realistic $pp\to\pi^+d/\pi^+pn$ calculation that includes $S \rightleftharpoons D$ channel coupling between the final nucleons. A semi-quantitative understanding of the observed effects is achieved., Comment: 10 pages, 3 figures

Published
2009
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19. A large acceptance scintillator detector with wavelength shifting fibre read-out for search of eta-nucleus bound states

Author

Kilian, K., Kliczewski, S., Kirillov, Da., Kirillov, Di., Kolev, D., Kravcikova, M., Kutsarova, T., Lesiak, M., Lieb, J., Machner, H., Magiera, A., Maier, R., Martinska, G., Nedev, S., Piskunov, N., Prasuhn, D., Prottic, D., Ritman, J., von Rossen, P., Roy, B. J., Shukla, P., Sitnik, I., Siudak, R., Tsenov, R., Ulicny, M., Urban, J., and Vankova, G.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

A large acceptance scintillator detector with wavelength shifting optical fibre readout has been designed and built to detect the decay particles of $\eta$-nucleus bound system (the so-called $\eta$-mesic nuclei), namely, protons and pions. The detector, named as ENSTAR detector, consists of 122 pieces of plastic scintillator of various shapes and sizes, which are arranged in a cylindrical geometry to provide particle identification, energy loss and coarse position information for these particles. A solid angle coverage of $\sim$95% of total 4$\pi$ is obtained in the present design of the detector. Monte Carlo phase space calculations performed to simulate the formation and decay of $\eta$-mesic nuclei suggest that its decay particles, the protons and pions are emitted with an opening angle of 150$^\circ \pm 20^\circ$, and with energies in the range of 25 to 300 MeV and 225 to 450 MeV respectively. The detailed GEANT simulations show that $\sim$ 80 % of the decay particles (protons and pions) can be detected within ENSTAR. Several test measurements using alpha source, cosmic-ray muons etc. have been carried out to study the response of ENSTAR scintillator pieces. The in-beam tests of fully assembled detector with proton beam of momentum 870 MeV/c from the Cooler synchrotron COSY have been performed. The test results show that the scintillator fiber design chosen for the detector has performed satisfactorily well. The present article describes the detector design, simulation studies, construction details and test results., Comment: accepted by Nucl. Instr. Methods in Phys. Research A

Published
2007
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20. Measurement of the Vector and Tensor Polarisation of Proton and Deuteron Beams

Author

The GEM Collaboration, Lesiak, M., Abdel-Bary, M., Budzanowski, A., Chatterjee, A., Ernst, J., Gebel, R., Hawranek, P., Jahn, R., Jha, V., Kilian, K., Kliczewski, S., Kirillov, Da., Kirillov, Di., Kolev, D., Kravcikova, M., Kutsarova, T., Lieb, J., Machner, H., Magiera, A., Maier, R., Martinska, G., Nedev, S., Piskunov, N., Prasuhn, D., Protic, D., von Rossen, P., Roy, B. J., Sitnik, I., Siudak, R., Tsenov, R., Ulicny, M., Urban, J., Vankova, G., and Wilkin, C.

Subjects
High Energy Physics - Experiment
Abstract

Measurement of the d + d -> 4He + eta reaction using vector and tensor polarised beam has been performed at COSY using Big Karl magnetic spectrograph. The beam polarisation necessary for obtaining the vector and tensor analysing power for this reaction was measured. The method and the results of the tensor polarisation measurement of the deuteron beam are presented., Comment: 5 pages, 4 figures Talk presented at the XI Workshop on High Energy Spin Physics, Dubna, Russia, 27 Sep - 1 Oct 2005

Published
2005

21. A precision determination of the mass of the $\eta$ meson

Author

The GEM collaboration, Abdel-Bary, M., Budzanowski, A., Chatterjee, A., Ernst, J., Hawranek, P., Jahn, R., Jha, V., Kilian, K., Kliczewski, S., Kirillov, D., Kolev, D., Kravcikova, M., Kutsarova, T., Lesiak, M., Lieb, J., Machner, H., Magiera, A., Maier, R., Martinska, G., Nedev, S., Piskunov, N., Prasuhn, D., Protić, D., von Rossen, P., Roy, B. J., Sitnik, I., Siudak, R., Smiechowicz, M., Stein, H. J., Tsenov, R., Ulicny, M., Urban, J., and Vankova, G.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

Several processes of meson production in proton-deuteron collisions have been measured simultaneously using a calibrated magnetic spectrograph. Among these processes, the $\eta$ meson is seen clearly as a sharp missing--mass peak on a slowly varying background in the $p+d\to ^3\textrm{He} +X$ reaction. Knowing the kinematics of the other reactions with well determined masses, it is possible to deduce a precise mass for the $\eta$ meson. The final result, $m(\eta)=547.311\pm 0.028 \textrm{(stat)} \pm 0.032 \textrm{(syst) MeV/c}^2$, is significantly lower than that found by the recent NA48 measurement, though it is consistent with values obtained in earlier counter experiments., Comment: 10 pages, 6 figures, Fig. 3 changed

Published
2005
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22. Studies of the Three-Nucleon System Dynamics in the Deuteron-Proton Breakup Reaction

Author

Ciepał I., Kłos B., Stephan E., Kistryn St., Biegun A., Bodek K., Deltuva A., Epelbaum E., Eslami-Kalantari M., Fonseca A. C., Golak J., Jha V., Kalantar-Nayestanaki N., Kamada H., Khatri G., Kirillov Da., Kirillov Di., Kliczewski St., Kozela A., Kravcikova M., Machner H., Magiera A., Martinska G., Messchendorp J., Nogga A., Parol W., Ramazani-Moghaddam-Arani A., Roy B. J., Sakai H., Sekiguchi K., Sitnik I., Siudak R., Skibiński R., Sworst R., Urban J., Witała H., and Zejma J.

Subjects
Physics, QC1-999
Abstract

One of the most important goals of modern nuclear physics is to contruct nuclear force model which properly describes the experimental data. To develop and test predictions of current models the breakup 1H( d→ $$\overrightarrow d$ , pp)n reaction was investigated experimentally at 100 and 130 MeV deuteron beam energies. Rich set of data for cross section, vector and tensor analyzing powers was obtained with the use of the SALAD and BINA detectors at KVI and Germanium Wall setup at FZ-Jülich. Results are compared with various theoretical approaches which describe the three-nucleon (3N) system dynamics. For correct description of the cross section data both, three-nucleon force (3NF) and Coulomb force, have to be included into calculations and influence of those ingredients is seizable at specific parts of the phase space. In case of the vector analyzing powers very low sensitivity to any effects beyond nucleon-nucleon interaction was found. At 130 MeV, the Axy data are not correctly described when 3NF models are included into calculations.

Published
2014
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23. Results of Measurements of the Analyzing Powers for Polarized Neutrons on C, CH 2 and Cu Targets for Momenta Between 3 and 4.2 GeV/c

Author

Sitnik, I M, primary, Basilev, S N, additional, Bushuev, Yu P, additional, Gavrishchuk, O P, additional, Glagolev, V V, additional, Kirillov, D A, additional, Kostayeva, N V, additional, Kovalenko, A D, additional, Legostaeva, K S, additional, Livanov, A N, additional, Philippov, I A, additional, Piskunov, N M, additional, Povtoreiko, A A, additional, Rukoyatkin, P A, additional, Shindin, R A, additional, Shipunov, A V, additional, Shutov, A V, additional, Slepnev, V M, additional, Slepnev, I V, additional, Terletskiy, A V, additional, Hamilton, K, additional, Montgomery, R, additional, Annand, J R M, additional, Marchand, D, additional, Wang, Y, additional, Tomasi-Gustafsson, E, additional, Perdrisat, C F, additional, Punjabi, V, additional, Martinska, G, additional, Urban, J, additional, and Musinsky, J, additional

Published
2020
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24. Studies of the Three-Nucleon System Dynamics in the Deuteron-Proton Breakup Reaction

Author

Nogga A., Messchendorp J., Martinska G., Magiera A., Machner H., Kravcikova M., Kozela A., Kliczewski St., Kirillov Di., Kirillov Da., Khatri G., Kamada H., Jha V., Kalantar-Nayestanaki N., Golak J., Fonseca A. C., Eslami-Kalantari M., Epelbaum E., Deltuva A., Bodek K., Biegun A., Stephan E., Kistryn St., Kłos Barbara, Ciepał Izabela, Parol W., Ramazani-Moghaddam-Arani A., Roy B. J., Sakai H., Sekiguchi K., Sitnik I., Siudak R., Skibiński R., Sworst R., Urban J., Witała H., Wrońska A., and Zejma J.

Subjects
Physics, QC1-999
Abstract

Precise and large sets of cross sections for the 1H(d, pp)n and 2H(p, pp)n breakup reactions were measured at 130 deuteron and 190 MeV proton beam energies with the use of detectors which covered almost the full phase space. The results are compared with various theoretical approaches which model the 3N system dynamics. The calculations are based on different 2N potentials which can be combined with models of the three-nucleon force (3NF). The differential cross sections appear to be a very sensitive tool for testing the interaction models and allow to search for various ingredients of the dynamics, not only the 3NF but also the Coulomb interaction and relativistic effects which are relatively new achievements of the theory.

Published
2012
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25. Technical Supplement to 'Polarization Transfer Observables in Elastic Electron-Proton Scattering at Q$^2$ = 2.5, 5.2, 6.8, and 8.5 GeV$^2$'

Author

Puckett, A.J.R., Brash, E.J., Jones, M.K., Luo, W., Meziane, M., Pentchev, L., Perdrisat, C.F., Punjabi, V., Wesselmann, F.R., Ahmidouch, A., Albayrak, I., Aniol, K.A., Arrington, J., Asaturyan, A., Baghdasaryan, H., Benmokhtar, F., Bertozzi, W., Bimbot, L., Bosted, P., Boeglin, W., Butuceanu, C., Carter, P., Chernenko, S., Christy, E., Commisso, M., Cornejo, J.C., Covrig, S., Danagoulian, S., Daniel, A., Davidenko, A., Day, D., Dhamija, S., Dutta, D., Ent, R., Frullani, S., Fenker, H., Frlez, E., Garibaldi, F., Gaskell, D., Gilad, S., Gilman, R., Goncharenko, Y., Hafidi, K., Hamilton, D., Higinbotham, D.W., Hinton, W., Horn, T., Hu, B., Huang, J., Huber, G.M., Jensen, E., Keppel, C., Khandaker, M., King, P., Kirillov, D., Kohl, M., Kravtsov, V., Kumbartzki, G., Li, Y., Mamyan, V., Margaziotis, D.J., Marsh, A., Matulenko, Y., Maxwell, J., Mbianda, G., Meekins, D., Melnik, Y., Miller, J., Mkrtchyan, A., Mkrtchyan, H., Moffit, B., Moreno, O., Mulholland, J., Narayan, A., Nedev, S., Nurruzzaman, N., Piasetzky, E., Pierce, W., Piskunov, N.M., Prok, Y., Ransome, R.D., Razin, D.S., Reimer, P., Reinhold, J., Rondon, O., Shabestari, M., Shahinyan, A., Shestermanov, K., Sirca, S., Sitnik, I., Smykov, L., Smith, G., Solovyev, L., Solvignon, P., Subedi, R., Tomasi-Gustafsson, E., Vasiliev, A., Veilleux, M., Wojtsekhowski, B.B., Wood, S., Ye, Z., Zanevsky, Y., Zhang, X., Zhang, Y., Zheng, X., Zhu, L., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de l'Accélérateur Linéaire (LAL), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, GEp-III, GEp-2Gamma, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
carbon: target, Proton form factors, elastic scattering, FOS: Physical sciences, Proton polarimeter, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], spin, High Energy Physics - Experiment, electron p: scattering, High Energy Physics - Experiment (hep-ex), Electromagnetic calorimeter, Spin transport, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], angular distribution, Nuclear Experiment (nucl-ex), Nuclear Experiment, hydrogen: target, polarization, track data analysis, p: trajectory, hodoscope, p: momentum, alignment, Magnetic spectrometer, showers, Polarization transfer method, optics, time projection chamber, aluminum: target, kinematics, dispersion, correction, Jefferson Lab, experimental results
Abstract

The GEp-III and GEp-2$\gamma$ experiments, carried out in Jefferson Lab's Hall C from 2007-2008, consisted of measurements of polarization transfer in elastic electron-proton scattering at momentum transfers of $Q^2 = 2.5, 5.2, 6.8,$ and $8.54$ GeV$^2$. These measurements were carried out to improve knowledge of the proton electromagnetic form factor ratio $R = \mu_p G_E^p/G_M^p$ at large values of $Q^2$ and to search for effects beyond the Born approximation in polarization transfer observables at $Q^2 = 2.5$ GeV$^2$. The final results of both experiments were reported in a recent archival publication. A full reanalysis of the data from both experiments was carried out in order to reduce the systematic and, for the GEp-2$\gamma$ experiment, statistical uncertainties. This technical note provides additional details of the final analysis omitted from the main publication, including the final evaluation of the systematic uncertainties., Comment: 33 pages, 33 figures. v3 = Final manuscript as accepted for publication in Nuclear Instruments and Methods Section A (in press)

Published
2018
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26. Polarization transfer observables in elastic electron-proton scattering at Q2=2.5, 5.2, 6.8, and 8.5 GeV2

Author

Puckett, A. J. R., Brash, E. J., Jones, M. K., Luo, W., Meziane, M., Pentchev, L., Perdrisat, C. F., Punjabi, V., Wesselmann, F. R., Afanasev, A., Ahmidouch, A., Albayrak, I., Aniol, K. A., Arrington, J., Asaturyan, A., Baghdasaryan, H., Benmokhtar, F., Bertozzi, W., Bimbot, L., Bosted, P., Boeglin, W., Butuceanu, C., Carter, P., Chernenko, S., Christy, M. E., Commisso, M., Cornejo, J. C., Covrig, S., Danagoulian, S., Daniel, A., Davidenko, A., Day, D., Dhamija, S., Dutta, D., Ent, R., Frullani, S., Fenker, H., Frlez, E., Garibaldi, F., Gaskell, D., Gilad, S., Gilman, R., Goncharenko, Y., Hafidi, K., Hamilton, D., Higinbotham, D. W., Hinton, W., Horn, T., Hu, B., Huang, J., Huber, G. M., Jensen, E., Keppel, C., Khandaker, M., King, P., Kirillov, D., Kohl, M., Kravtsov, V., Kumbartzki, G., Li, Y., Mamyan, V., Margaziotis, D. J., Marsh, A., Matulenko, Y., Maxwell, J., Mbianda, G., Meekins, D., Melnik, Y., Miller, J., Mkrtchyan, A., Mkrtchyan, H., Moffit, B., Moreno, O., Mulholland, J., Narayan, A., Nedev, S., Nuruzzaman, Piasetzky, E., Pierce, W., Piskunov, N. M., Prok, Y., Ransome, R. D., Razin, D. S., Reimer, P., Reinhold, J., Rondon, O., Shabestari, M., Shahinyan, A., Shestermanov, K., Širca, S., Sitnik, I., Smykov, L., Smith, G., Solovyev, L., Solvignon, P., Subedi, R., Tomasi-Gustafsson, E., Vasiliev, A., Veilleux, M., Wojtsekhowski, B. B., Wood, S., Ye, Z., Zanevsky, Y., Zhang, X., Zhang, Y., Zheng, X., and Zhu, L.

Abstract

Purpose: The GEp-III and GEp-2γ experiments were carried out in Jefferson Laboratory’s (JLab’s) Hall C from\ud 2007 to 2008, to extend the knowledge of Gp\ud E/Gp\ud M to the highest practically achievable Q2 given the maximum\ud beam energy of 6 GeV and to search for effects beyond the Born approximation in polarization transfer observables\ud of elastic ep scattering. This article provides an expanded description of the common experimental apparatus and\ud data analysis procedures, and reports the results of a final reanalysis of the data from both experiments, including\ud the previously unpublished results of the full-acceptance dataset of the GEp-2γ experiment.\ud Methods: Polarization transfer observables in elastic ep → ep scattering were measured at central Q2 values\ud of 2.5, 5.2, 6.8, and 8.54 GeV2\ud . At Q2 = 2.5 GeV2\ud , data were obtained for central values of the virtual photon\ud polarization parameter of 0.149, 0.632, and 0.783. The Hall C High Momentum Spectrometer detected and\ud measured the polarization of protons recoiling elastically from collisions of JLab’s polarized electron beam\ud with a liquid hydrogen target. A large-acceptance electromagnetic calorimeter detected the elastically scattered\ud electrons in coincidence to suppress inelastic backgrounds.\ud Results: The final GEp-III data are largely unchanged relative to the originally published results. The statistical\ud uncertainties of the final GEp-2γ data are significantly reduced at = 0.632 and 0.783 relative to the original\ud publication.\ud Conclusions: The final GEp-III results show that the decrease with Q2 of Gp\ud E/Gp\ud M continues to Q2 = 8.5 GeV2, but at a slowing rate relative to the approximately linear decrease observed in earlier Hall A measurements. At\ud Q2 = 8.5 GeV2\ud , Gp\ud E/Gp\ud M remains positive but is consistent with zero. At Q2 = 2.5 GeV2\ud , Gp\ud E/Gp\ud M derived from\ud the polarization component ratio R ∝ Pt/P shows no statistically significant dependence, as expected in the\ud Born approximation. On the other hand, the ratio Pl/P Born\ud l of the longitudinal polarization transfer component\ud to its Born value shows an enhancement of roughly 1.7% at = 0.783 relative to = 0.149, with ≈ 2.2σ\ud significance based on the total uncertainty, implying a similar effect in the transverse component Pt that cancels\ud in the ratio R.

Published
2017

27. Polarization transfer observables in elastic electron-proton scattering at Q2=2.5, 5.2, 6.8, and 8.5 GeV2

Author

Puckett, AJR, Brash, EJ, Jones, MK, Luo, W, Meziane, M, Pentchev, L, Perdrisat, CF, Punjabi, V, Wesselmann, FR, Afanasev, A, Ahmidouch, A, Albayrak, I, Aniol, KA, Arrington, J, Asaturyan, A, Baghdasaryan, H, Benmokhtar, F, Bertozzi, W, Bimbot, L, Bosted, P, Boeglin, W, Butuceanu, C, Carter, P, Chernenko, S, Christy, ME, Commisso, M, Cornejo, JC, Covrig, S, Danagoulian, S, Daniel, A, Davidenko, A, Day, D, Dhamija, S, Dutta, D, Ent, R, Frullani, S, Fenker, H, Frlez, E, Garibaldi, F, Gaskell, D, Gilad, S, Gilman, R, Goncharenko, Y, Hafidi, K, Hamilton, D, Higinbotham, DW, Hinton, W, Horn, T, Hu, B, Huang, J, Huber, GM, Jensen, E, Keppel, C, Khandaker, M, King, P, Kirillov, D, Kohl, M, Kravtsov, V, Kumbartzki, G, Li, Y, Mamyan, V, Margaziotis, DJ, Marsh, A, Matulenko, Y, Maxwell, J, Mbianda, G, Meekins, D, Melnik, Y, Miller, J, Mkrtchyan, A, Mkrtchyan, H, Moffit, B, Moreno, O, Mulholland, J, Narayan, A, Nedev, S, Nuruzzaman, Piasetzky, E, Pierce, W, Piskunov, NM, Prok, Y, Ransome, RD, Razin, DS, Reimer, P, Reinhold, J, Rondon, O, Shabestari, M, Shahinyan, A, Shestermanov, K, Širca, S, Sitnik, I, Smykov, L, Smith, G, Solovyev, L, Solvignon, P, Subedi, R, Tomasi-Gustafsson, E, Vasiliev, A, Veilleux, M, and Wojtsekhowski, BB

Subjects
Particle and Plasma Physics, Molecular, Nuclear, Atomic, Nuclear & Particles Physics
Abstract

Background: Interest in the behavior of nucleon electromagnetic form factors at large momentum transfers has steadily increased since the discovery, using polarization observables, of the rapid decrease of the ratio GEp/GMp of the proton's electric and magnetic form factors for momentum transfers Q21 GeV2, in strong disagreement with previous extractions of this ratio using the traditional Rosenbluth separation technique. Purpose: The GEp-III and GEp-2γ experiments were carried out in Jefferson Laboratory's (JLab's) Hall C from 2007 to 2008, to extend the knowledge of GEp/GMp to the highest practically achievable Q2 given the maximum beam energy of 6 GeV and to search for effects beyond the Born approximation in polarization transfer observables of elastic ∫ - p scattering. This article provides an expanded description of the common experimental apparatus and data analysis procedures, and reports the results of a final reanalysis of the data from both experiments, including the previously unpublished results of the full-acceptance dataset of the GEp-2γ experiment. Methods: Polarization transfer observables in elastic ∫ - p→∫ - scattering were measured at central Q2 values of 2.5, 5.2, 6.8, and 8.54 GeV2. At Q2=2.5GeV2, data were obtained for central values of the virtual photon polarization parameter ϵ of 0.149, 0.632, and 0.783. The Hall C High Momentum Spectrometer detected and measured the polarization of protons recoiling elastically from collisions of JLab's polarized electron beam with a liquid hydrogen target. A large-acceptance electromagnetic calorimeter detected the elastically scattered electrons in coincidence to suppress inelastic backgrounds. Results: The final GEp-III data are largely unchanged relative to the originally published results. The statistical uncertainties of the final GEp-2γ data are significantly reduced at ϵ=0.632 and 0.783 relative to the original publication. Conclusions: The final GEp-III results show that the decrease with Q2 of GEp/GMp continues to Q2=8.5GeV2, but at a slowing rate relative to the approximately linear decrease observed in earlier Hall A measurements. At Q2=8.5GeV2, GEp/GMp remains positive but is consistent with zero. At Q2=2.5GeV2, GEp/GMp derived from the polarization component ratio R-Pt/P shows no statistically significant ϵ dependence, as expected in the Born approximation. On the other hand, the ratio P""/P""Born of the longitudinal polarization transfer component to its Born value shows an enhancement of roughly 1.7% at ϵ=0.783 relative to ϵ=0.149, with ≈2.2σ significance based on the total uncertainty, implying a similar effect in the transverse component Pt that cancels in the ratio R.

Published
2017

28. Polarization Transfer Observables in Elastic Electron Proton Scattering at $Q^2 = $2.5, 5.2, 6.8, and 8.5 GeV$^2$

Author

Puckett, A.J.R., Brash, E.J., Jones, M.K., Luo, W., Meziane, M., Pentchev, L., Perdrisat, C.F., Punjabi, V., Wesselmann, F.R., Afanasev, A., Ahmidouch, A., Albayrak, I., Aniol, K.A., Arrington, J., Asaturyan, A., Baghdasaryan, H., Benmokhtar, F., Bertozzi, W., Bimbot, L., Bosted, P., Boeglin, W., Butuceanu, C., Carter, P., Chernenko, S., Christy, E., Commisso, M., Cornejo, J.C., Covrig, S., Danagoulian, S., Daniel, A., Davidenko, A., Day, D., Dhamija, S., Dutta, D., Ent, R., Frullani, S., Fenker, H., Frlez, E., Garibaldi, F., Gaskell, D., Gilad, S., Gilman, R., Goncharenko, Y., Hafidi, K., Hamilton, D., Higinbotham, D.W., Hinton, W., Horn, T., Hu, B., Huang, J., Huber, G.M., Jensen, E., Keppel, C., Khandaker, M., King, P., Kirillov, D., Kohl, M., Kravtsov, V., Kumbartzki, G., Li, Y., Mamyan, V., Margaziotis, D.J., Marsh, A., Matulenko, Y., Maxwell, J., Mbianda, G., Meekins, D., Melnik, Y., Miller, J., Mkrtchyan, A., Mkrtchyan, H., Moffit, B., Moreno, O., Mulholland, J., Narayan, A., Nedev, S., Nuruzzaman, N., Piasetzky, E., Pierce, W., Piskunov, N.M., Prok, Y., Ransome, R.D., Razin, D.S., Reimer, P., Reinhold, J., Rondon, O., Shabestari, M., Shahinyan, A., Shestermanov, K., Širca, S., Sitnik, I., Smykov, L., Smith, G., Solovyev, L., Solvignon, P., Subedi, R., Tomasi-Gustafsson, E., Vasiliev, A., Veilleux, M., Wojtsekhowski, B.B., Wood, S., Ye, Z., Zanevsky, Y., Zhang, X., Zhang, Y., Zheng, X., Zhu, L., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Born approximation, generalized parton distribution, electron: trajectory, FOS: Physical sciences, Newport News CEBAF Linac, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], spin, bremsstrahlung, electron p: elastic scattering, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), hydrogen: liquid: target, quark: constituent, p: form factor: ratio, quantum chromodynamics, radiative correction, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], p: polarization, p: recoil, angular distribution, Nuclear Experiment (nucl-ex), electron: beam, Nuclear Experiment, background: suppression, lattice field theory, helicity, vector meson, time projection chamber, Dyson-Schwinger equation, calorimeter: electromagnetic, experimental equipment, analyzing power, asymmetry, Jefferson Lab, experimental results
Abstract

The GEp-III and GEp-2$\gamma$ experiments were carried out in Jefferson Lab's (JLab's) Hall C from 2007-2008, to extend the knowledge of $G_E^p/G_M^p$ to the highest practically achievable $Q^2$ and to search for effects beyond the Born approximation in polarization transfer observables of elastic $\vec{e}p$ scattering. This article reports an expanded description of the common experimental apparatus and data analysis procedure, and the results of a final reanalysis of the data from both experiments, including the previously unpublished results of the full-acceptance data of the GEp-2$\gamma$ experiment. The Hall C High Momentum Spectrometer detected and measured the polarization of protons recoiling elastically from collisions of JLab's polarized electron beam with a liquid hydrogen target. A large-acceptance electromagnetic calorimeter detected the elastically scattered electrons in coincidence to suppress inelastic backgrounds. The final GEp-III data are largely unchanged relative to the originally published results. The statistical uncertainties of the final GEp-2$\gamma$ data are significantly reduced at $\epsilon = 0.632$ and $0.783$ relative to the original publication. The decrease with $Q^2$ of $G_E^p/G_M^p$ continues to $Q^2 = 8.5$ GeV$^2$, but at a slowing rate relative to the approximately linear decrease observed in earlier Hall A measurements. At $Q^2 = 2.5$ GeV$^2$, the proton form factor ratio $G_E^p/G_M^p$ shows no statistically significant $\epsilon$-dependence, as expected in the Born approximation. The ratio $P_\ell/P_\ell^{Born}$ of the longitudinal polarization transfer component to its Born value shows an enhancement of roughly 1.4\% at $\epsilon = 0.783$ relative to $\epsilon = 0.149$, with $\approx 1.9\sigma$ significance based on the total uncertainty, implying a similar effect in the transverse component $P_t$ that cancels in the ratio $R$., Comment: 44 pages, 28 figures. Archival publication for the GEp-III and GEp-2gamma experiments that ran in Jefferson Lab's experimental Hall C from October, 2007 to June, 2008. v2: final manuscript as accepted by PRC. v3: Replaced figures 13 and 19 with corrected versions from published Erratum. Also made minor corrections to the text and to Table XI reflecting the corrections in the published Erratum

Published
2017
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29. Detailed comparison of the pp→π+pn and pp→π+d reactions at 951 MeV

Author

Abdel-Bary, M., Budzanowski, A., Chatterjee, A., Ernst, J., Hawranek, P., Hinterberger, F., Jha, V., Kilian, K., Kliczewski, S., Kirillov, D., Kolev, D., Kravcikova, M., Kutsarova, T., Lesiak, M., Lieb, J., Machner, H., Magiera, A., Maier, R., Martinska, G., Nedev, S., Niskanen, J., Piskunov, N., Prasuhn, D., Protić, D., von Rossen, P., Roy, B.J., Sitnik, I., Siudak, R., Smiechowicz, M., Tsenov, R., Ulicny, M., Urban, J., Vankova, G., and Wilkin, C.

Subjects
Nuclear and High Energy Physics
Published
2005
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30. Use of the calorimeter to improve analyzing power of the reactions, investigating secondary proton polarization

Author

Basilev, S N, primary, Bushuev, Yu P, additional, Glagolev, V V, additional, Kirillov, D A, additional, Kostyaeva, N V, additional, Kovalenko, A D, additional, Livanov, A N, additional, Marchand, D, additional, Martinska, G, additional, Musinsky, J, additional, Perdrisat, C F, additional, Piskunov, N M, additional, Rukoyatkin, P A, additional, Punjabi, V, additional, Shindin, R A, additional, Sitnik, I M, additional, Slepnev, V. M, additional, Slepnev, I V, additional, Tomasi-Gustafsson, E, additional, Urban, J, additional, and Wang, V, additional

Published
2016
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31. Studies of the Three-Nucleon System Dynamics in the Deuteron-Proton Breakup Reaction

Author

Ciepał, Izabela, Kłos, Barbara, Kistryn, St., Stephan, Elżbieta, Biegun, A., Bodek, K., Deltuva, A., Epelbaum, E., Eslami-Kalantari, M., Fonseca, A. C., Golak, J., Jha, V., Kalantar-Nayestanaki, N., Kamada, H., Khatri, G., Kirillov, Da., Kirillov, Di., Kliczewski, St., Kozela, A., Kravcikova, M., Machner, H., Magiera, A., Martinska, G., Messchendorp, J., Nogga, A., Parol, W., Ramazani-Moghaddam-Arani, A., Roy, B. J., Sakai, H., Sekiguchi, K., Sitnik, I., Siudak, R., Skibiński, R., Sworst, R., Urban, J., Witała, H., Wrońska, A., and Zejma, J.

Subjects
similarity renormalization, bodies, Physics, QC1-999, nuclei, Nuclear Theory, Nuclear Experiment
Abstract

Precise and large sets of cross sections for the 1H(d,pp) n and 2H(p,pp) n breakup reactions were measured at 130 deuteron and 190 MeV proton beam energies with the use of detectors which covered almost the full phase space. The results are compared with various theoretical approaches which model the 3N system dynamics. The calculations are based on different 2N potentials which can be combined with models of the three-nucleon force (3NF). The differential cross sections appear to be a very sensitive tool for testing the interaction models and allow to search for various ingredients of the dynamics, not only the 3NF but also the Coulomb interaction and relativistic effects which are relatively new achievements of the theory.

Published
2012

32. Final analysis of proton form factor ratio data at Q(2)=4.0, 4.8, and 5.6 GeV2

Author

Puckett, A. J. R., Brash, E. J., Gayou, O., Jones, M. K., Pentchev, L., Perdrisat, C. F., Punjabi, V., Aniol, K. A., Averett, T., Benmokhtar, F., Bertozzi, W., Bimbot, L., Calarco, J. R., Cavata, C., Chai, Z., Chang, C. -C., Chang, T., Chen, J. P., Chudakov, E., De Leo, R., Dieterich, S., Endres, R., Epstein, M. B., Escoffier, S., Fissum, Kevin, Fonvieille, H., Frullani, S., Gao, J., Garibaldi, F., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Hansen, J. -O., Higinbotham, D., Huber, G. M., Iodice, M., de Jager, C. W., Jiang, X., Khandaker, M., Kozlov, S., Kramer, K. M., Kumbartzki, G., LeRose, J. J., Lhuillier, D., Lindgren, R. A., Liyanage, N., Lolos, G. J., Margaziotis, D. J., Marie, F., Markowitz, P., McCormick, K., Michaels, R., Milbrath, B. D., Nanda, S. K., Neyret, D., Piskunov, N. M., Ransome, R. D., Raue, B. A., Roche, R., Rvachev, M., Salgado, C., Sirca, S., Sitnik, I., Strauch, S., Todor, L., Tomasi-Gustafsson, E., Urciuoli, G. M., Voskanyan, H., Wijesooriya, K., Wojtsekhowski, B. B., Zheng, X., and Zhu, L.

Subjects
Subatomic Physics
Abstract

Precise measurements of the proton electromagnetic form factor ratio R = mu(p)G(E)(p)/G(M)(p) using the polarization transfer method at Jefferson Lab have revolutionized the understanding of nucleon structure by revealing the strong decrease of R with momentum transfer Q(2) for Q(2) greater than or similar to 1 GeV2, in strong disagreement with previous extractions of R from cross-section measurements. In particular, the polarization transfer results have exposed the limits of applicability of the one-photon-exchange approximation and highlighted the role of quark orbital angular momentum in the nucleon structure. The GEp-II experiment in Jefferson Lab's Hall A measured R at four Q(2) values in the range 3.5 GeV2

Published
2012

33. Search for effects beyond the Born approximation in polarization transfer observables in $\vec{e}p$ elastic scattering

Author

Meziane, M., Brash, E. J., Gilman, R., Jones, M. K., Luo, W., Pentchev, L., Perdrisat, C. F., Puckett, A. J. R., Punjabi, V., Wesselmann, F. R., Ahmidouch, A., Albayrak, I., Aniol, K. A., Arrington, J., Asaturyan, A., Ates, O., Baghdasaryan, H., Benmokhtar, F., Bertozzi, W., Bimbot, L., Bosted, P., Boeglin, W., Butuceanu, C., Carter, P., Chernenko, S., Christy, E., Commisso, M., Cornejo, J. C., Covrig, S., Danagoulian, S., Daniel, A., Davidenko, A., Day, D., Dhamija, S., Dutta, D., Ent, R., Frullani, S., Fenker, H., Frlez, E., Garibaldi, F., Gaskell, D., Gilad, S., Goncharenko, Y., Hafidi, K., Hamilton, D., Higinbotham, D. W., Hinton, W., Horn, T., Hu, B., Huang, J., Huber, G. M., Jensen, E., Kang, H., Keppel, C., Khandaker, M., King, P., Kirillov, D., Kohl, M., Kravtsov, V., Kumbartzki, G., Li, Y., Mamyan, V., Margaziotis, D. J., Markowitz, P., Marsh, A., Matulenko, Y., Maxwell, J., Mbianda, G., Meekins, D., Melnik, Y., Miller, J., Mkrtchyan, A., Mkrtchyan, H., Moffit, B., Moreno, O., Mulholland, J., Narayan, A., Nuruzzaman, Nedev, S., Piasetzky, E., Pierce, W., Piskunov, N. M., Prok, Y., Ransome, R. D., Razin, D. S., Reimer, P. E., Reinhold, J., Rondon, O., Shabestari, M., Shahinyan, A., Shestermanov, K., Sirca, S., Sitnik, I., Smykov, L., Smith, G., Solovyev, L., Solvignon, P., Subedi, R., Suleiman, R., Tomasi-Gustafsson, E., Vasiliev, A., Vanderhaeghen, M., Veilleux, M., Wojtsekhowski, B. B., Wood, S., Ye, Z., Zanevsky, Y., Zhang, X., Zhang, Y., Zheng, X., Zhu, L., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, HALL A, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Nuclear Theory (nucl-th), Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton electric to magnetic form factor ratio, $G_{E}/G_{M}$, obtained separately from cross section and polarization transfer measurements. One possible explanation for this difference is a two-photon-exchange (TPEX) contribution. In an effort to search for effects beyond the one-photon-exchange or Born approximation, we report measurements of polarization transfer observables in the elastic $H(\vec{e},e'\vec{p})$ reaction for three different beam energies at a fixed squared momentum transfer $Q^2 = 2.5$ GeV$^2$, spanning a wide range of the virtual photon polarization parameter, $\epsilon$. From these measured polarization observables, we have obtained separately the ratio $R$, which equals $\mu_p G_{E}/G_{M}$ in the Born approximation, and the longitudinal polarization transfer component $P_\ell$, with statistical and systematic uncertainties of $\Delta R \approx \pm 0.01 \mbox{(stat)} \pm 0.013 \mbox{(syst)}$ and $\Delta P_\ell/P^{Born}_{\ell} \approx \pm 0.006 \mbox{(stat)}\pm 0.01 \mbox{(syst)}$. The ratio $R$ is found to be independent of $\epsilon$ at the 1.5% level, while the $\epsilon$ dependence of $P_\ell$ shows an enhancement of $(2.3 \pm 0.6) %$ relative to the Born approximation at large $\epsilon$.

Published
2011
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35. Cross sections of the pp→K⁺ε⁺n reaction close to threshold

Author

Budzanowski, A., Chatterjee, A., Clement, H., Dorochkevitch, E., Hawranek, P., Hinterberger, F., Jahn, R., Joosten, R., Kilian, K., Kliczewski, S., Kirillov, Da, Kirillov, Di, Kolev, D., Kravcikova, M., Lesiak, M., Machner, H., Magiera, A., Martinska, G., Piskunov, N., Protić, D., Ritman, J., von Rossen, P., Roy, B.J., Sibirtsev, A., Sitnik, I., Siudak, R., Tsenov, R., Ulbrich, K., Urban, J., and Wagner, G.J.

Subjects
Physik (inkl. Astronomie)
Published
2010

36. Experimental study of the p + ⁶Li → η + ⁷be reaction 11.3 MeV above threshold

Author

Budzanowski, A., Chatterjee, A., Hawranek, P., Jahn, R., Jha, V., Kilian, K., Kliczewski, S., Kirillov, Da., Kirillov, Di., Kolev, D., Kravcikova, M., Lesiak, M., Lieb, J., Machner, H., Magiera, A., Maier, R., Martinska, G., Piskunov, N., Protić, D., Ritman, J., von Rossen, P., Roy, B.J., Sitnik, I., Siudak, R., Tsenov, R., Urban, J., and Vankova, G.

Subjects
Physik (inkl. Astronomie)
Published
2010

37. Experimental study of the $p+^{6}Li\rightarrow \eta +^{7}Be$ reaction 11.3 MeV above threshold

Author

Budzanowski, A., Chatterjee, A., Hawranek, P., Jahn, R., Jha, V., Kilian, K., Kliczewski, S., Kirillov, Da., Kirillov, Di., Kolev, D., Kravcikova, M., Lesiak, M., Lieb, J., Machner, H., Magiera, Andrzej, Maier, R., Martinska, G., Piskunov, N., Protić, D., Ritman, J., von Rossen, P., Roy, B. J., Sitnik, I., Siudak, R., Tsenov, R., Urban, J., and Vankova, G.

Published
2010

38. High resolution study of the $\lambda p$ final state interaction in the reaction $p+p\rightarrow K^{+}+(\lambda p)$

Author

Budzanowski, A., Chatterjee, A., Clement, H., Dorochkevitch, E., Hawranek, P., Hinterberger, F., Jahn, R., Joosten, R., Kilian, K., Kliczewski, S., Kirillov, Da., Kirillov, Di., Kolev, D., Kravcikova, M., Lesiak, M., Machner, H., Magiera, Andrzej, Martinska, G., Piskunov, N., Ritman, J., von Rossen, P., Roy, B. J., Sibirtsev, A., Sitnik, I., Siudak, R., Tsenov, R., Ulbrich, K., Urban, J., and Wagner, G. J.

Subjects
nucleon-induced reactions, hyperon-nucleon interactions, forces in hadronic systems and effective interactions, nuclear reaction models and methods
Published
2010

39. Cross sections of the $pp\rightarrow K^{+}\Sigma ^{+}n$ reaction close to threshold

Author

Budzanowski, A., Chatterjee, A., Clement, H., Dorochkevitch, E., Hawranek, P., Hinterberger, F., Jahn, R., Joosten, R., Kilian, K., Kliczewski, S., Kirillov, Da., Kirillov, Di., Kolev, D., Kravcikova, M., Lesiak, M., Machner, H., Magiera, Andrzej, Martinska, G., Piskunov, N., Protić, D., Ritman, J., von Rossen, P., Roy, B. J., Sibirtsev, A., Sitnik, I., Siudak, R., Tsenov, R., Ulbrich, K., Urban, J., and Wagner, G. J.

Subjects
hyperon–nucleon interaction, meson production
Published
2010

40. Experimental study of the p + $^{6}$ Li → η + $^{7}$ Be reaction 11.3 MeV above threshold

Author

Budzanowski, A., Chatterjee, A., Kravcikova, M., Lesiak, M., Lieb, J., Machner, H., Magiera, A., Maier, R., Martinska, G., Piskunov, N., Protić, D., Ritman, J., Hawranek, P., von Rossen, P., Roy, B. J., Sitnik, I., Siudak, R., Tsenov, R., Urban, J., Vankova, G., Jahn, R., Jha, V., Kilian, K., Kliczewski, S., Kirillov, Da., Kirillov, Di., and Kolev, D.

Subjects
High Energy Physics::Experiment, ddc:530, Nuclear Experiment
Abstract

The cross section for the reaction p+6Li→η+7Be was measured at an excess energy of 11.28 MeV above threshold by detecting the recoiling Be7 nuclei. A dedicated set of focal plane detectors was built for the magnetic spectrograph Big Karl and was used for identification and four-momentum measurement of Be7. A differential cross section of dσdΩ=[0.69±0.20(stat.)±0.20(syst.)] nb/sr for the ground state plus 1/2− was measured. The result is compared to model calculations.

Published
2010
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41. Precision measurements of the $pp\rightarrow \pi ^{+}pn$ and $pp\rightarrow \pi ^{+}d$ reactions : importance of long-range and tensor force effects

Author

Budzanowski, A., Chatterjee, A., Hawranek, P., Hinterberger, F., Jahn, R., Jha, V., Kilian, K., Kirillov, Da., Kirillov, Di., Kliczewski, S., Kolev, D., Kravcikova, M., Lesiak, M., Lieb, J., Machner, H., Magiera, Andrzej, Maier, R., Martinska, G., Nedev, S., Niskanen, J. A., Piskunov, N., Protić, D., Ritman, J., von Rossen, P., Roy, B. J., Sitnik, I., Siudak, R., Stein, H. J., Tsenov, R., Urban, J., Vankova, G., and Wilkin, C.

Published
2009

42. Coulomb Force Effects in Deuteron--Proton Breakup Reaction

Author

Ciepał, I., primary, Kłos, B., additional, Kozela, A., additional, Stephan, E., additional, Kistryn, St., additional, Biegun, A., additional, Bodek, K., additional, Deltuva, A., additional, Eslami-Kalantari, M., additional, Jha, V., additional, Kalantar-Nayestanaki, N., additional, Khatri, G., additional, Kirillov, Da., additional, Kirillov, Di., additional, Kliczewski, St., additional, Kravcikova, M., additional, Kulessa, P., additional, Machner, H., additional, Magiera, A., additional, Martinska, G., additional, Messchendorp, J., additional, Parol, W., additional, Ramazani-Moghaddam-Arani, A., additional, Roy, B.J., additional, Sakai, H., additional, Sekiguchi, K., additional, Sitnik, I., additional, Siudak, R., additional, Skwira-Chalot, I., additional, Sworst, R., additional, Urban, J., additional, and Zejma, J., additional

Published
2015
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43. $\pi ^{0}-\eta$ meson mixing in $pd^{3}H\pi^{+}/^{3}He\pi^{0}$ reactions

Author

Abdel-Bary, M., Hawranek, P., Ilieva, J., Kilian, K., Kirilov, D., Kistryn, Stanisław, Kliczewski, S., Klimala, W., Kolev, D., Kravčiková, M., Kutsarova, T., Lieb, J., Machner, H., Magiera, Andrzej, Martinská, G., Pentchev, L., Piskunov, N., von Rossen, P., Roy, B. J., Sitnik, I., Siudak, R., Smyrski, Jerzy, Tsenov, R., Uličný, M., Urbán, J., and Wrońska, Aleksandra

Published
2003

44. Pi0-eta mixing in pd -> 3H pi+/ 3He pi0 reactions

Author

Abdel-Samad, S., Hawranek, P., Lieb, J., Machner, H., Magiera, A., Martinska, G., Pentchev, L., Piskunov, N., von Rossen, P., Roy, B. J., Sitnik, I., Siudak, R., Ilieva, J., Smyrski, J., Tsenov, R., Ulicny, M., Urban, J., Wronska, A., Kilian, K., Kirilov, D., Kliczewski, S., Klimala, W., Kolev, D., Kravcikova, M., and Kutsarova, T.

Subjects
experimental results [magnetic spectrometer], tritium, Nuclear Theory, +helium+pi0%22">p deuteron --> helium pi0, momentum dependence, Juelich COSY PS, symmetry breaking [isospin], ratio [differential cross section], +tritium+pi%2B%22">p deuteron --> tritium pi+, hadroproduction [pi], nuclear reaction [p deuteron], 1.56-1.70 GeV-cms, (eta pi0) [interference], High Energy Physics::Experiment, ddc:530, Nuclear Experiment, production [light nucleus], nuclide [helium]
Abstract

Beam momentum dependence of the experimental cross sections for pd-->(3)Hpi(+)/(3)Hepi(0) reactions have been studied at large proton-pion relative angle. The measurements were performed for five beam momenta in the region of the eta meson production threshold. Observed behavior of the measured cross sections ratio reveals manifestations of the isospin symmetry breaking effects. A simple model allows one to interpret the isospin symmetry breaking in terms of pi(0)-eta meson mixing. Based on that model analysis of the experimental results leads to the mixing angle value of 0.006+/-0.005 rad.

Published
2003
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46. Analyzing powers for the inclusive reaction of deuterons on carbon at energies between 0.175 and 1.6 GeV

Author

Ladygin, V P, Tomasi-Gustafsson, E, Ball, J, Bimbot, L, Bisson, Y, Boivin, M, Boyard, J L, Cheung, N E, Courtat, P, Gacougnolle, R, Hennino, T, Jones, M K, Künne, R A, Perdrisat, C F, Piskunov, N M, Punjabi, V, Sitnik, I M, Skowron, R, Strokovsky, E A, Zupranski, P, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Blanchet, Marie-Christine

Subjects
[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Particle Physics - Experiment
Published
1998

48. Systematic Studies of the Three-nucleon System Dynamics in the Deutron–Proton Breakup Reaction

Author

Kłos, B., primary, Ciepał, I., additional, Kistryn, St., additional, Stephan, E., additional, Biegun, A., additional, Bodek, K., additional, Deltuva, A., additional, Epelbaum, E., additional, Eslami-Kalantari, M., additional, Fonseca, A.C., additional, Golak, J., additional, Jamróz, B., additional, Jha, V., additional, Kalantar-Nayestanaki, N., additional, Kamada, H., additional, Khatri, G., additional, Kirillov, Da., additional, Kirillov, Di., additional, Kliczewski, St., additional, Kozela, A., additional, Kravcikova, M., additional, Machner, H., additional, Magiera, A., additional, Martinska, G., additional, Messchendorp, J., additional, Nogga, A., additional, Parol, W., additional, Ramazani-Moghaddam-Arani, A., additional, Roy, B.J., additional, Sakai, H., additional, Sekiguchi, K., additional, Sitnik, I., additional, Siudak, R., additional, Skibiński, R., additional, Sworst, R., additional, Urban, J., additional, Witała, H., additional, Wrońska, A., additional, and Zejma, J., additional

Published
2013
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