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1. 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

2. 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

3. 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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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, 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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5. 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

6. 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

7. 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

8. A precision measurement of the $p$($e,e^\prime p\,$)$\pi^0$ reaction at threshold

Author

Chirapatpimol, K., Shabestari, M. H., Lindgren, R. A., Smith, L. C., Annand, J. R. M., Higinbotham, D. W., Moffit, B., Nelyubin, V., Norum, B. E., Allada, K., Aniol, K., Ardashev, K., Armstrong, D. S., Arndt, R. A., Benmokhtar, F., Bernstein, A. M., Bertozzi, W., Briscoe, W. J., Bimbot, L., Camsonne, A., Chen, J. -P., Choi, S., Chudakov, E., Cisbani, E., Cusanno, F., Dalton, M. M., Dutta, C., Egiyan, K., Fernandez-Ramirez, C., Feuerbach, R., Fissum, K. G., Frullani, S., Garibaldi, F., Gayou, O., Gilman, R., Gilad, S., Goity, J., Gomez, J., Hahn, B., Hamilton, D., Hansen, J. -O., Huang, J., Igarashi, R., Ireland, D., de Jager, C. W., Jin, X., Jiang, X., Jinasundera, T., Kellie, J., Keppel, C. E., Kolb, N., LeRose, J., Liyanage, N., Livingston, K., McNulty, D., Mercado, L., Michaels, R., Mihovilovic, M., Qian, S., Qian, X., Mailyan, S., Mamyan, V., Marrone, S., Monaghan, P., Nanda, S., Perdrisat, C. F., Piasetzky, E., Protopopescu, D., Punjabi, V., Qiang, Y., Rachek, I. A., Rakhman, A., Ron, G., Rosner, G., Saha, A., Sawatzky, B., Shahinyan, A., Sirca, S., Sparveris, N., Subedi, R. R., Suleiman, R., Strakovsky, I., Sulkosky, V., Moinelo, J., Voskanyan, H., Wang, K., Wang, Y., Watson, J., Watts, D., Wojtsekhowski, B., Workman, R. L., Yao, H., Zhan, X., and Zhang, Y.

Subjects
Nuclear Experiment
Abstract

New results are reported from a measurement of $\pi^0$ electroproduction near threshold using the $p(e,e^{\prime} p)\pi^0$ reaction. The experiment was designed to determine precisely the energy dependence of $s-$ and $p-$wave electromagnetic multipoles as a stringent test of the predictions of Chiral Perturbation Theory (ChPT). The data were taken with an electron beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time, complete coverage of the $\phi^*_{\pi}$ and $\theta^*_{\pi}$ angles in the $p \pi^0$ center-of-mass was obtained for invariant energies above threshold from 0.5 MeV up to 15 MeV. The 4-momentum transfer $Q^2$ coverage ranges from 0.05 to 0.155 (GeV/c)$^2$ in fine steps. A simple phenomenological analysis of our data shows strong disagreement with $p-$wave predictions from ChPT for $Q^2>0.07$ (GeV/c)$^2$, while the $s-$wave predictions are in reasonable agreement., Comment: 5 pages, 6 figures

Published
2015
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9. First Measurement of the Neutral Current Excitation of the Delta Resonance on a Proton Target

Author

G0 Collaboration, Androic, D., Armstrong, D. S., Arvieux, J., Bailey, S. L., Beck, D. H., Beise, E. J., Benesch, J., Benmokhtar, F., Bimbot, L., Birchall, J., Bosted, P., Breuer, H., Capuano, C. L., Chao, Y. -C., Coppens, A., Davis, C. A., Ellis, C., Flores, G., Franklin, G., Furget, C., Gaskell, D., Grames, J., Gericke, M. T. W., Guillard, G., Hansknecht, J., Horn, T., Jones, M. K., King, P. M., Korsch, W., Kox, S., Lee, L., Liu, J., Lung, A., Mammei, J., Martin, J. W., McKeown, R. D., Micherdzinska, A., Mihovilovic, M., Mkrtchyan, H., Muether, M., Page, S. A., Papavassiliou, V., Pate, S. F., Phillips, S. K., Pillot, P., Pitt, M. L., Poelker, M., Quinn, B., Ramsay, W. D., Real, J. -S., Roche, J., Roos, P., Schaub, J., Seva, T., Simicevic, N., Smith, G. R., Spayde, D. T., Stutzman, M., Suleiman, R., Tadevosyan, V., van Oers, W. T. H., Versteegen, M., Voutier, E., Vulcan, W., Wells, S. P., Williamson, S. E., and Wood, S. A.

Subjects
Nuclear Experiment
Abstract

The parity-violating asymmetry arising from inelastic electron-nucleon scattering at backward angle (~95 degrees) near the Delta(1232) resonance has been measured using a hydrogen target. From this asymmetry, we extracted the axial transition form factor G^A_{N\Delta}, a function of the axial Adler form factors C^A_i. Though G^A_{N\Delta} has been previously studied using charged current reactions, this is the first measurement of the weak neutral current excitation of the Delta using a proton target. For Q^2 = 0.34 (GeV/c)^2 and W = 1.18 GeV, the asymmetry was measured to be -33.4 \pm (5.3)_{stat} \pm (5.1)_{sys} ppm. The value of G^A_{N\Delta} determined from the hydrogen asymmetry was -0.05 \pm (0.35)_{stat} \pm (0.34)_{sys} \pm (0.06)_{theory}. These findings agree within errors with theoretical predictions for both the total asymmetry and the form factor. In addition to the hydrogen measurement, the asymmetry was measured at the same kinematics using a deuterium target. The asymmetry for deuterium was determined to be -43.6 \pm (14.6)_{stat} \pm (6.2)_{sys} ppm., Comment: 8 pages, 3 figures, submitted to Physics Letters B

Published
2012

10. Virtual Compton Scattering and the Generalized Polarizabilities of the Proton at Q^2=0.92 and 1.76 GeV^2

Author

Fonvieille, H., Laveissiere, G., Degrande, N., Jaminion, S., Jutier, C., Todor, L., Di Salvo, R., Van Hoorebeke, L., Alexa, L. C., Anderson, B. D., Aniol, K. A., Arundell, K., Audit, G., Auerbach, L., Baker, F. T., Baylac, M., Berthot, J., Bertin, P. Y., Bertozzi, W., Bimbot, L., Boeglin, W. U., Brash, E. J., Breton, V., Breuer, H., Burtin, E., Calarco, J. R., Cardman, L. S., Cavata, C., Chang, C. -C., Chen, J. -P., Chudakov, E., Cisbani, E., Dale, D. S., deJager, C. W., De Leo, R., Deur, A., d'Hose, N., Dodge, G. E., Domingo, J. J., Elouadrhiri, L., Epstein, M. B., Ewell, L. A., Finn, J. M., Fissum, K. G., Fournier, G., Frois, B., Frullani, S., Furget, C., Gao, H., Gao, J., Garibaldi, F., Gasparian, A., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Grenier, P., Guichon, P. A. M., Hansen, J. O., Holmes, R., Holtrop, M., Howell, C., Huber, G. M., Hyde, C. E., Incerti, S., Iodice, M., Jardillier, J., Jones, M. K., Kahl, W., Kato, S., Katramatou, A. T., Kelly, J. J., Kerhoas, S., Ketikyan, A., Khayat, M., Kino, K., Kox, S., Kramer, L. H., Kumar, K. S., Kumbartzki, G., Kuss, M., Leone, A., LeRose, J. J., Liang, M., Lindgren, R. A., Liyanage, N., Lolos, G. J., Lourie, R. W., Madey, R., Maeda, K., Malov, S., Manley, D. M., Marchand, C., Marchand, D., Margaziotis, D. J., Markowitz, P., Marroncle, J., Martino, J., McCormick, K., McIntyre, J., Mehrabyan, S., Merchez, F., Meziani, Z. E., Michaels, R., Miller, G. W., Mougey, J. Y., Nanda, S. K., Neyret, D., Offermann, E. A. J. M., Papandreou, Z., Pasquini, B., Perdrisat, C. F., Perrino, R., Petratos, G. G., Platchkov, S., Pomatsalyuk, R., Prout, D. L., Punjabi, V. A., Pussieux, T., Quemener, G., Ransome, R. D., Ravel, O., Real, J. S., Renard, F., Roblin, Y., Rowntree, D., Rutledge, G., Rutt, P. M., Saha, A., Saito, T., Sarty, A. J., Serdarevic, A., Smith, T., Smirnov, G., Soldi, K., Sorokin, P., Souder, P. A., Suleiman, R., Templon, J. A., Terasawa, T., Tieulent, R., Tomasi-Gustaffson, E., Tsubota, H., Ueno, H., Ulmer, P. E., Urciuoli, G. M., Vanderhaeghen, M., Van der Meer, R. L. J., Van De Vyver, R., Vernin, P., Vlahovic, B., Voskanyan, H., Voutier, E., Watson, J. W., Weinstein, L. B., Wijesooriya, K., Wilson, R., Wojtsekhowski, B. B., Zainea, D. G., Zhang, W. -M., Zhao, J., and Zhou, Z. -L.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

Virtual Compton Scattering (VCS) on the proton has been studied at Jefferson Lab using the exclusive photon electroproduction reaction (e p --> e p gamma). This paper gives a detailed account of the analysis which has led to the determination of the structure functions P_LL-P_TT/epsilon and P_LT, and the electric and magnetic generalized polarizabilities (GPs) alpha_E(Q^2) and beta_M(Q^2) at values of the four-momentum transfer squared Q^2= 0.92 and 1.76 GeV^2. These data, together with the results of VCS experiments at lower momenta, help building a coherent picture of the electric and magnetic GPs of the proton over the full measured Q^2-range, and point to their non-trivial behavior., Comment: version 2: modified according to PRC Editor's and Referee's recommendations. Archival paper for the E93-050 experiment at JLab Hall A. 28 pages, 23 figures, 5 cross-section tables. To be submitted to Phys.Rev.C

Published
2012
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11. Measurement of the parity-violating asymmetry in inclusive electroproduction of $\pi^-$ near the $\Delta^0$ resonance

Author

G0 Collaboration, Androić, D., Armstrong, D. S., Arvieux, J., Bailey, S. L., Beck, D. H., Beise, E. J., Benesch, J., Benmokhtar, F., Bimbot, L., Birchall, J., Bosted, P., Breuer, H., Capuano, C. L., Chao, Y. -C., Coppens, A., Davis, C. A., Ellis, C., Flores, G., Franklin, G., Furget, C., Gaskell, D., Gericke, M. T. W., Grames, J., Guillard, G., Hansknecht, J., Horn, T., Jones, M. K., King, P. M., Korsch, W., Kox, S., Lee, L., Liu, J., Lung, A., Mammei, J., Martin, J. W., McKeown, R. D., Micherdzinska, A., Mihovilovic, M., Mkrtchyan, H., Muether, M., Page, S. A., Papavassiliou, V., Pate, S. F., Phillips, S. K., Pillot, P., Pitt, M. L., Poelker, M., Quinn, B., Ramsay, W. D., Real, J. -S., Roche, J., Roos, P., Schaub, J., Seva, T., Simicevic, N., Smith, G. R., Spayde, D. T., Stutzman, M., Suleiman, R., Tadevosyan, V., van Oers, W. T. H., Versteegen, M., Voutier, E., Vulcan, W., Wells, S. P., Williamson, S. E., and Wood, S. A.

Subjects
Nuclear Experiment
Abstract

The parity-violating (PV) asymmetry of inclusive $\pi^-$ production in electron scattering from a liquid deuterium target was measured at backward angles. The measurement was conducted as a part of the G0 experiment, at a beam energy of 360 MeV. The physics process dominating pion production for these kinematics is quasi-free photoproduction off the neutron via the $\Delta^0$ resonance. In the context of heavy-baryon chiral perturbation theory (HB$\chi$PT), this asymmetry is related to a low energy constant $d_\Delta^-$ that characterizes the parity-violating $\gamma$N$\Delta$ coupling. Zhu et al. calculated $d_\Delta^-$ in a model benchmarked by the large asymmetries seen in hyperon weak radiative decays, and predicted potentially large asymmetries for this process, ranging from $A_\gamma^-=-5.2$ to $+5.2$ ppm. The measurement performed in this work leads to $A_\gamma^-=-0.36\pm 1.06\pm 0.37\pm 0.03$ ppm (where sources of statistical, systematic and theoretical uncertainties are included), which would disfavor enchancements considered by Zhu et al. proportional to $V_{ud}/V_{us}$. The measurement is part of a program of inelastic scattering measurements that were conducted by the G0 experiment, seeking to determine the $N-\Delta$ axial transition form-factors using PV electron scattering., Comment: 5 pages, 3 figures

Published
2011
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12. 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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13. Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasi-elastic Electron-Deuteron Scattering

Author

The G0 Collaboration, Androić, D., Armstrong, D. S., Arvieux, J., Bailey, S. L., Beck, D. H., Beise, E. J., Benesch, J., Benmokhtar, F., Bimbot, L., Birchall, J., Bosted, P., Breuer, H., Capuano, C. L., Chao, Y. -C., Coppens, A., Davis, C. A., Ellis, C., Flores, G., Franklin, G., Furget, C., Gaskell, D., Gericke, M. T. W., Grames, J., Guillard, G., Hansknecht, J., Horn, T., Jones, M. K., King, P. M., Korsch, W., Kox, S., Lee, L., Liu, J., Lung, A., Mammei, J., Martin, J. W., McKeown, R. D., Micherdzinska, A., Mihovilovic, M., Mkrtchyan, H., Muether, M., Page, S. A., Papavassiliou, V., Pate, S. F., Phillips, 10 S. K., Pillot, P., Pitt, M. L., Poelker, M., Quinn, B., Ramsay, W. D., Real, J. -S., Roche, J., Roos, P., Schaub, J., Seva, T., Simicevic, N., Smith, G. R., Spayde, D. T., Stutzman, M., Suleiman, R., Tadevosyan, V., van Oers, W. T. H., Versteegen, M., Voutier, E., Vulcan, W., Wells, S. P., Williamson, S. E., Wood, S. A., Pasquini, B., and Vanderhaeghen, M.

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

We have measured the beam-normal single-spin asymmetries in elastic scattering of transversely polarized electrons from the proton, and performed the first measurement in quasi-elastic scattering on the deuteron, at backward angles (lab scattering angle of 108 degrees) for Q2 = 0.22 GeV^2/c^2 and 0.63 GeV^2/c^2 at beam energies of 362 MeV and 687 MeV, respectively. The asymmetry arises due to the imaginary part of the interference of the two-photon exchange amplitude with that of single photon exchange. Results for the proton are consistent with a model calculation which includes inelastic intermediate hadronic (piN) states. An estimate of the beam-normal single-spin asymmetry for the scattering from the neutron is made using a quasi-static deuterium approximation, and is also in agreement with theory.

Published
2011
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14. The G0 Experiment: Apparatus for Parity-Violating Electron Scattering Measurements at Forward and Backward Angles

Author

G0 Collaboration, Androic, D., Armstrong, D. S., Arvieux, J., Asaturyan, R., Averett, T. D., Bailey, S. L., Batigne, G., Beck, D. H., Beise, E. J., Benesch, J., Benmokhtar, F., Bimbot, L., Birchall, J., Biselli, A., Bosted, P., Breuer, H., Brindza, P., Capuano, C. L., Carlini, R. D., Carr, R., Chant, N., Chao, Y. -C., Clark, R., Coppens, A., Covrig, S. D., Cowley, A., Dale, D., Davis, C. A., Ellis, C., Falk, W. R., Fenker, H., Finn, J. M., Forest, T., Franklin, G., Frascaria, R., Furget, C., Gaskell, D., Gericke, M. T. W., Grames, J., Griffioen, K. A., Grimm, K., Guillard, G., Guillon, B., Guler, H., Gustafsson, K., Hannelius, L., Hansknecht, J., Hasty, R. D., Allen, A. M. Hawthorne, Horn, T., Ito, T. M., Johnston, K., Jones, M., Kammel, P., Kazimi, R., King, P. M., Kolarkar, A., Korkmaz, E., Korsch, W., Kox, S., Kuhn, J., Lachniet, J., Laszewski, R., Lee, L., Lenoble, J., Liatard, E., Liu, J., Lung, A., MacLachlan, G. A., Mammei, J., Marchand, D., Martin, J. W., Mack, D. J., McFarlane, K. W., McKee, D. W., McKeown, R. D., Merchez, F., Mihovilovic, M., Micherdzinska, A., Mkrtchyan, H., Moffit, B., Morlet, M., Muether, M., Musson, J., Nakahara, K., Neveling, R., Niccolai, S., Nilsson, D., Ong, S., Page, S. A., Papavassiliou, V., Pate, S. F., Phillips, S. K., Pillot, P., Pitt, M. L., Poelker, M., Porcelli, T. A., Quemener, G., Quinn, B. P., Ramsay, W. D., Rauf, A. W., Real, J. -S., Ries, T., Roos, J. Roche P., Rutledge, G. A., Schaub, J., Secrest, J., Seva, T., Simicevic, N., Smith, G. R., Spayde, D. T., Stepanyan, S., Stutzman, M., Suleiman, R., Tadevosyan, V., Tieulent, R., van de Wiele, J., van Oers, W. T. H., Versteegen, M., Voutier, E., Vulcan, W. F., Wells, S. P., Warren, G., Williamson, S. E., Woo, R. J., Wood, S. A., Yan, C., Yun, J., and Zeps, V.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

In the G0 experiment, performed at Jefferson Lab, the parity-violating elastic scattering of electrons from protons and quasi-elastic scattering from deuterons is measured in order to determine the neutral weak currents of the nucleon. Asymmetries as small as 1 part per million in the scattering of a polarized electron beam are determined using a dedicated apparatus. It consists of specialized beam-monitoring and control systems, a cryogenic hydrogen (or deuterium) target, and a superconducting, toroidal magnetic spectrometer equipped with plastic scintillation and aerogel Cerenkov detectors, as well as fast readout electronics for the measurement of individual events. The overall design and performance of this experimental system is discussed., Comment: Submitted to Nuclear Instruments and Methods

Published
2011
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15. 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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16. 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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17. 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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18. G$^0$ Electronics and Data Acquisition (Forward-Angle Measurements)

Author

Marchand, D., Arvieux, J., Bimbot, L., Biselli, A., Bouvier, J., Breuer, H., Clark, R., Cuzon, J. -C., Engrand, M., Foglio, R., Furget, C., Grave, X., Guillon, B., Guler, H., King, P. M., Kox, S., Kuhn, J., Ky, Y., Lachniet, J., Lenoble, J., Liatard, E., Liu, J., Munoz, E., Pouxe, J., Quéméner, G., Quinn, B., Réal, J. -S., Rossetto, O., and Sellem, R.

Subjects
Nuclear Experiment
Abstract

The G$^0$ parity-violation experiment at Jefferson Lab (Newport News, VA) is designed to determine the contribution of strange/anti-strange quark pairs to the intrinsic properties of the proton. In the forward-angle part of the experiment, the asymmetry in the cross section was measured for $\vec{e}p$ elastic scattering by counting the recoil protons corresponding to the two beam-helicity states. Due to the high accuracy required on the asymmetry, the G$^0$ experiment was based on a custom experimental setup with its own associated electronics and data acquisition (DAQ) system. Highly specialized time-encoding electronics provided time-of-flight spectra for each detector for each helicity state. More conventional electronics was used for monitoring (mainly FastBus). The time-encoding electronics and the DAQ system have been designed to handle events at a mean rate of 2 MHz per detector with low deadtime and to minimize helicity-correlated systematic errors. In this paper, we outline the general architecture and the main features of the electronics and the DAQ system dedicated to G$^0$ forward-angle measurements., Comment: 35 pages. 17 figures. This article is to be submitted to NIM section A. It has been written with Latex using \documentclass{elsart}. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment In Press (2007)

Published
2007
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19. Phenomenological insight into JLab proton polarization data puzzle by deuteron impulse approximation

Author

Adamuscin, C., Bimbot, L., Dubnicka, S., Dubnickova, A. Z., and Tomasi-Gustafsson, E.

Subjects
High Energy Physics - Phenomenology
Abstract

The non-relativistic impulse approximation of deuteron electromagnetic form factors is used to investigate the space-like region behavior of the proton electric form factor in regard of the two contradictory experimental results extracted either from Rosenbluth separation method or from recoil proton JLab polarization data., Comment: Revtex, 6 pages, 7 figures

Published
2007
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20. Observation of coherent $\pi^0$ electroproduction on deuterons at large momentum transfer

Author

Tomasi-Gustafsson, E., Bimbot, L., Danagoulian, S., Gustafsson, K., Mack, D., Mrktchyan, H., and Rekalo, M. P.

Subjects
Nuclear Experiment
Abstract

The first experimental results for coherent $\pi^0$-electroproduction on the deuteron, $e+d\to e+d +\pi^0$, at large momentum transfer, are reported. The experiment was performed at Jefferson Laboratory at an incident electron energy of 4.05 GeV. A large pion production yield has been observed in a kinematical region for 1.1$

Published
2003
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21. Charged-particle multiplicity measurement in proton–proton collisions at TeV with ALICE at LHC

Author

The ALICE Collaboration, Aamodt, K, Abel, N, Abeysekara, U, Abrahantes Quintana, A, Abramyan, A, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agocs, AG, Aguilar Salazar, S, Ahammed, Z, Ahmad, A, Ahmad, N, Ahn, SU, Akimoto, R, Akindinov, A, Aleksandrov, D, Alessandro, B, Alfaro Molina, R, Alici, A, Almaráz Aviña, E, Alme, J, Alt, T, Altini, V, Altinpinar, S, Andrei, C, Andronic, A, Anelli, G, Angelov, V, Anson, C, Antičić, T, Antinori, F, Antinori, S, Antipin, K, Antończyk, D, Antonioli, P, Anzo, A, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arceo, R, Arend, A, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Asryan, A, Augustinus, A, Averbeck, R, Awes, TC, Äystö, J, Azmi, MD, Bablok, S, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baldit, A, Bán, J, Barbera, R, Barnaföldi, GG, Barnby, L, Barret, V, Bartke, J, Barile, F, Basile, M, Basmanov, V, Bastid, N, Bathen, B, Batigne, G, Batyunya, B, Baumann, C, Bearden, IG, Becker, B, Belikov, I, Bellwied, R, Belmont-Moreno, E, Belogianni, A, Benhabib, L, Beole, S, Berceanu, I, Bercuci, A, Berdermann, E, Berdnikov, Y, Betev, L, Bhasin, A, Bhati, AK, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, Bielčíková, J, Bilandzic, A, Bimbot, L, Biolcati, E, and Blanc, A

Subjects
Particle and High Energy Physics, Physical Sciences, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract

The pseudorapidity density and multiplicity distribution of charged particles produced in proton-proton collisions at the LHC, at a centre-of-mass energy √s= 7 TeV, were measured in the central pseudorapidity region {pipe}η{pipe} < 1. Comparisons are made with previous measurements at √s = 0.9 TeV and 2.36 TeV. At √s = 7 TeV, for events with at least one charged particle in {pipe}η{pipe} < 1, we obtain dNch/dη = 6.01 ± 0.01(stat.)+0.20-0.12(syst.). This corresponds to an increase of 57.6% ± 0.4%(stat.)+3.6-1.8%(syst.) relative to collisions at 0.9 TeV, significantly higher than calculations from commonly used models. The multiplicity distribution at 7 TeV is described fairly well by the negative binomial distribution. © 2010 CERN for the benefit of the ALICE collaboration.

Published
2010

22. Charged-particle multiplicity measurement in proton–proton collisions at and 2.36 TeV with ALICE at LHC

Author

The ALICE Collaboration, Aamodt, K, Abel, N, Abeysekara, U, Abrahantes Quintana, A, Abramyan, A, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agocs, AG, Aguilar Salazar, S, Ahammed, Z, Ahmad, A, Ahmad, N, Ahn, SU, Akimoto, R, Akindinov, A, Aleksandrov, D, Alessandro, B, Alfaro Molina, R, Alici, A, Almaráz Aviña, E, Alme, J, Alt, T, Altini, V, Altinpinar, S, Andrei, C, Andronic, A, Anelli, G, Angelov, V, Anson, C, Antičić, T, Antinori, F, Antinori, S, Antipin, K, Antończyk, D, Antonioli, P, Anzo, A, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arceo, R, Arend, A, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Asryan, A, Augustinus, A, Averbeck, R, Awes, TC, Äystö, J, Azmi, MD, Bablok, S, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baldit, A, Bán, J, Barbera, R, Barnaföldi, GG, Barnby, L, Barret, V, Bartke, J, Barile, F, Basile, M, Basmanov, V, Bastid, N, Bathen, B, Batigne, G, Batyunya, B, Baumann, C, Bearden, IG, Becker, B, Belikov, I, Bellwied, R, Belmont-Moreno, E, Belogianni, A, Benhabib, L, Beole, S, Berceanu, I, Bercuci, A, Berdermann, E, Berdnikov, Y, Betev, L, Bhasin, A, Bhati, AK, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, Bielčíková, J, Bilandzic, A, Bimbot, L, Biolcati, E, and Blanc, A

Subjects
Particle and High Energy Physics, Physical Sciences, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract

Charged-particle production was studied in proton-proton collisions collected at the LHC with the ALICE detector at centre-of-mass energies 0.9 TeV and 2.36 TeV in the pseudorapidity range {pipe}η{pipe}

Published
2010

23. First proton–proton collisions at the LHC as observed with the ALICE detector: measurement of the charged-particle pseudorapidity density at GeV

Author

The ALICE Collaboration, Aamodt, K, Abel, N, Abeysekara, U, Abrahantes Quintana, A, Acero, A, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agocs, AG, Aguilar Salazar, S, Ahammed, Z, Ahmad, A, Ahmad, N, Ahn, SU, Akimoto, R, Akindinov, A, Aleksandrov, D, Alessandro, B, Alfaro Molina, R, Alici, A, Almaráz Aviña, E, Alme, J, Alt, T, Altini, V, Altinpinar, S, Andrei, C, Andronic, A, Anelli, G, Angelov, V, Anson, C, Antičić, T, Antinori, F, Antinori, S, Antipin, K, Antończyk, D, Antonioli, P, Anzo, A, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arceo, R, Arend, A, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Asryan, A, Augustinus, A, Averbeck, R, Awes, TC, Äystö, J, Azmi, MD, Bablok, S, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baldit, A, Bán, J, Barbera, R, Barnaföldi, GG, Barnby, L, Barret, V, Bartke, J, Barile, F, Basile, M, Basmanov, V, Bastid, N, Bathen, B, Batigne, G, Batyunya, B, Baumann, C, Bearden, IG, Becker, B, Belikov, I, Bellwied, R, Belmont-Moreno, E, Belogianni, A, Benhabib, L, Beole, S, Berceanu, I, Bercuci, A, Berdermann, E, Berdnikov, Y, Betev, L, Bhasin, A, Bhati, AK, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, Bielčíková, J, Bilandzic, A, Bimbot, L, Biolcati, E, and Blanc, A

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract

On 23rd November 2009, during the early commissioning of the CERN Large Hadron Collider (LHC), two counter-rotating proton bunches were circulated for the first time concurrently in the machine, at the LHC injection energy of 450 GeV per beam. Although the proton intensity was very low, with only one pilot bunch per beam, and no systematic attempt was made to optimize the collision optics, all LHC experiments reported a number of collision candidates. In the ALICE experiment, the collision region was centred very well in both the longitudinal and transverse directions and 284 events were recorded in coincidence with the two passing proton bunches. The events were immediately reconstructed and analyzed both online and offline. We have used these events to measure the pseudorapidity density of charged primary particles in the central region. In the range |η|

Published
2010

24. First proton-proton collisions at the LHC as observed with the ALICE detector: Measurement of the charged-particle pseudorapidity density at √s = 900 GeV

Author

Aamodt, K, Abel, N, Abeysekara, U, Abrahantes Quintana, A, Acero, A, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agocs, AG, Aguilar Salazar, S, Ahammed, Z, Ahmad, A, Ahmad, N, Ahn, SU, Akimoto, R, Akindinov, A, Aleksandrov, D, Alessandro, B, Alfaro Molina, R, Alici, A, Almaráz Aviña, E, Alme, J, Alt, T, Altini, V, Altinpinar, S, Andrei, C, Andronic, A, Anelli, G, Angelov, V, Anson, C, Antičić, T, Antinori, F, Antinori, S, Antipin, K, Antończyk, D, Antonioli, P, Anzo, A, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arceo, R, Arend, A, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Asryan, A, Augustinus, A, Averbeck, R, Awes, TC, Äystö, J, Azmi, MD, Bablok, S, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baldit, A, Bán, J, Barbera, R, Barnaföldi, GG, Barnby, L, Barret, V, Bartke, J, Barile, F, Basile, M, Basmanov, V, Bastid, N, Bathen, B, Batigne, G, Batyunya, B, Baumann, C, Bearden, IG, Becker, B, Belikov, I, Bellwied, R, Belmont-Moreno, E, Belogianni, A, Benhabib, L, Beole, S, Berceanu, I, Bercuci, A, Berdermann, E, Berdnikov, Y, Betev, L, Bhasin, A, Bhati, AK, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, Bielčíková, J, Bilandzic, A, Bimbot, L, Biolcati, E, Blanc, A, and Blanco, F

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

On 23rd November 2009, during the early commissioning of the CERN Large Hadron Collider (LHC), two counter-rotating proton bunches were circulated for the first time concurrently in the machine, at the LHC injection energy of 450 GeV per beam. Although the proton intensity was very low, with only one pilot bunch per beam, and no systematic attempt was made to optimize the collision optics, all LHC experiments reported a number of collision candidates. In the ALICE experiment, the collision region was centred very well in both the longitudinal and transverse directions and 284 events were recorded in coincidence with the two passing proton bunches. The events were immediately reconstructed and analyzed both online and offline. We have used these events to measure the pseudorapidity density of charged primary particles in the central region. In the range |η|

Published
2010

25. Charged-particle multiplicity measurement in proton-proton collisions at √s = 7 TeV with ALICE at LHC

Author

Aamodt, K, Abel, N, Abeysekara, U, Abrahantes Quintana, A, Abramyan, A, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agocs, AG, Aguilar Salazar, S, Ahammed, Z, Ahmad, A, Ahmad, N, Ahn, SU, Akimoto, R, Akindinov, A, Aleksandrov, D, Alessandro, B, Alfaro Molina, R, Alici, A, Almaráz Aviña, E, Alme, J, Alt, T, Altini, V, Altinpinar, S, Andrei, C, Andronic, A, Anelli, G, Angelov, V, Anson, C, Antičić, T, Antinori, F, Antinori, S, Antipin, K, Antończyk, D, Antonioli, P, Anzo, A, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arceo, R, Arend, A, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Asryan, A, Augustinus, A, Averbeck, R, Awes, TC, Äystö, J, Azmi, MD, Bablok, S, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baldit, A, Bán, J, Barbera, R, Barnaföldi, GG, Barnby, L, Barret, V, Bartke, J, Barile, F, Basile, M, Basmanov, V, Bastid, N, Bathen, B, Batigne, G, Batyunya, B, Baumann, C, Bearden, IG, Becker, B, Belikov, I, Bellwied, R, Belmont-Moreno, E, Belogianni, A, Benhabib, L, Beole, S, Berceanu, I, Bercuci, A, Berdermann, E, Berdnikov, Y, Betev, L, Bhasin, A, Bhati, AK, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, Bielčíková, J, Bilandzic, A, Bimbot, L, Biolcati, E, Blanc, A, and Blanco, F

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

The pseudorapidity density and multiplicity distribution of charged particles produced in proton-proton collisions at the LHC, at a centre-of-mass energy √s= 7 TeV, were measured in the central pseudorapidity region {pipe}η{pipe} < 1. Comparisons are made with previous measurements at √s = 0.9 TeV and 2.36 TeV. At √s = 7 TeV, for events with at least one charged particle in {pipe}η{pipe} < 1, we obtain dNch/dη = 6.01 ± 0.01(stat.)+0.20-0.12(syst.). This corresponds to an increase of 57.6% ± 0.4%(stat.)+3.6-1.8%(syst.) relative to collisions at 0.9 TeV, significantly higher than calculations from commonly used models. The multiplicity distribution at 7 TeV is described fairly well by the negative binomial distribution. © 2010 CERN for the benefit of the ALICE collaboration.

Published
2010

26. Charged-particle multiplicity measurement in proton-proton collisions at √s 0.9 and 2.36 TeV with ALICE at LHC

Author

Aamodt, K, Abel, N, Abeysekara, U, Abrahantes Quintana, A, Abramyan, A, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agocs, AG, Aguilar Salazar, S, Ahammed, Z, Ahmad, A, Ahmad, N, Ahn, SU, Akimoto, R, Akindinov, A, Aleksandrov, D, Alessandro, B, Alfaro Molina, R, Alici, A, Almaráz Aviña, E, Alme, J, Alt, T, Altini, V, Altinpinar, S, Andrei, C, Andronic, A, Anelli, G, Angelov, V, Anson, C, Antičić, T, Antinori, F, Antinori, S, Antipin, K, Antończyk, D, Antonioli, P, Anzo, A, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arceo, R, Arend, A, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Asryan, A, Augustinus, A, Averbeck, R, Awes, TC, Äystö, J, Azmi, MD, Bablok, S, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baldit, A, Bán, J, Barbera, R, Barnaföldi, GG, Barnby, L, Barret, V, Bartke, J, Barile, F, Basile, M, Basmanov, V, Bastid, N, Bathen, B, Batigne, G, Batyunya, B, Baumann, C, Bearden, IG, Becker, B, Belikov, I, Bellwied, R, Belmont-Moreno, E, Belogianni, A, Benhabib, L, Beole, S, Berceanu, I, Bercuci, A, Berdermann, E, Berdnikov, Y, Betev, L, Bhasin, A, Bhati, AK, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, Bielčíková, J, Bilandzic, A, Bimbot, L, Biolcati, E, Blanc, A, and Blanco, F

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

Charged-particle production was studied in proton-proton collisions collected at the LHC with the ALICE detector at centre-of-mass energies 0.9 TeV and 2.36 TeV in the pseudorapidity range {pipe}η{pipe}

Published
2010

27. The G0 experiment: Apparatus for parity-violating electron scattering measurements at forward and backward angles

Author

Androić, D., Armstrong, D.S., Arvieux, J., Asaturyan, R., Averett, T.D., Bailey, S.L., Batigne, G., Beck, D.H., Beise, E.J., Benesch, J., Benmokhtar, F., Bimbot, L., Birchall, J., Biselli, A., Bosted, P., Breuer, H., Brindza, P., Capuano, C.L., Carlini, R.D., Carr, R., Chant, N., Chao, Y.-C., Clark, R., Coppens, A., Covrig, S.D., Cowley, A., Dale, D., Davis, C.A., Ellis, C., Falk, W.R., Fenker, H., Finn, J.M., Forest, T., Franklin, G., Frascaria, R., Furget, C., Gaskell, D., Gericke, M.T.W., Grames, J., Griffioen, K.A., Grimm, K., Guillard, G., Guillon, B., Guler, H., Gustafsson, K., Hannelius, L., Hansknecht, J., Hasty, R.D., Hawthorne Allen, A.M., Horn, T., Ito, T.M., Johnston, K., Jones, M., Kammel, P., Kazimi, R., King, P.M., Kolarkar, A., Korkmaz, E., Korsch, W., Kox, S., Kuhn, J., Lachniet, J., Laszewski, R., Lee, L., Lenoble, J., Liatard, E., Liu, J., Lung, A., MacLachlan, G.A., Mammei, J., Marchand, D., Martin, J.W., Mack, D.J., McFarlane, K.W., McKee, D.W., McKeown, R.D., Merchez, F., Mihovilovic, M., Micherdzinska, A., Mkrtchyan, H., Moffit, B., Morlet, M., Muether, M., Musson, J., Nakahara, K., Neveling, R., Niccolai, S., Nilsson, D., Ong, S., Page, S.A., Papavassiliou, V., Pate, S.F., Phillips, S.K., Pillot, P., Pitt, M.L., Poelker, M., Porcelli, T.A., Quéméner, G., Quinn, B.P., Ramsay, W.D., Rauf, A.W., Real, J.-S., Ries, T., Roche, J., Roos, P., Rutledge, G.A., Schaub, J., Secrest, J., Seva, T., Simicevic, N., Smith, G.R., Spayde, D.T., Stepanyan, S., Stutzman, M., Suleiman, R., Tadevosyan, V., Tieulent, R., van de Wiele, J., van Oers, W.T.H., Versteegen, M., Voutier, E., Vulcan, W.F., Wells, S.P., Warren, G., Williamson, S.E., Woo, R.J., Wood, S.A., Yan, C., Yun, J., and Zeps, V.

Published
2011
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28. Production of pions, kaons and protons in pp collisions at $\sqrt{s}= 900~\mathrm{GeV}$ with ALICE at the LHC

Author

Aamodt, K., Abel, N., Abeysekara, U., Abrahantes Quintana, A., Abramyan, A., Adamová, D., Aggarwal, M. M., Aglieri Rinella, G., Agocs, A. G., Aguilar Salazar, S., Ahammed, Z., Ahmad, A., Ahmad, N., Ahn, S. U., Akimoto, R., Akindinov, A., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Alici, A., Almaráz Aviña, E., Alme, J., Alt, T., Altini, V., Altinpinar, S., Andrei, C., Andronic, A., Anelli, G., Angelov, V., Anson, C., Antičić, T., Antinori, F., Antinori, S., Antipin, K., Antończyk, D., Antonioli, P., Anzo, A., Aphecetche, L., Appelshäuser, H., Arcelli, S., Arceo, R., Arend, A., Armesto, N., Arnaldi, R., Aronsson, T., Arsene, I. C., Asryan, A., Augustinus, A., Averbeck, R., Awes, T. C., Äystö, J., Azmi, M. D., Bablok, S., Bach, M., Badalà, A., Baek, Y. W., Bagnasco, S., Bailhache, R., Bala, R., Baldisseri, A., Baldit, A., Bán, J., Barbera, R., Barnaföldi, G. G., Barnby, L. S., Barret, V., Bartke, J., Barile, F., Basile, M., Basmanov, V., Bastid, N., Bathen, B., Batigne, G., Batyunya, B., Baumann, C., Bearden, I. G., Becker, B., Belikov, I., Bellwied, R., Belmont-Moreno, E., Belogianni, A., Benhabib, L., Beole, S., Berceanu, I., Bercuci, A., Berdermann, E., Berdnikov, Y., Betev, L., Bhasin, A., Bhati, A. K., Bianchi, L., Bianchi, N., Bianchin, C., Bielčík, J., Bielčíková, J., Bilandzic, A., Bimbot, L., Biolcati, E., Blanc, A., Blanco, F., Blanco, F., Blau, D., Blume, C., Boccioli, M., Bock, N., Bogdanov, A., Bøggild, H., Bogolyubsky, M., Bohm, J., Boldizsár, L., Bombara, M., Bombonati, C., Bondila, M., Borel, H., Borisov, A., Bortolin, C., Bose, S., Bosisio, L., Bossú, F., Botje, M., Böttger, S., Bourdaud, G., Boyer, B., Braun, M., Braun-Munzinger, P., Bravina, L., Bregant, M., Breitner, T., Bruckner, G., Brun, R., Bruna, E., Bruno, G. E., Budnikov, D., Buesching, H., Buncic, P., Busch, O., Buthelezi, Z., Caffarri, D., Cai, X., Caines, H., Calvo, E., Camacho, E., Camerini, P., Campbell, M., Canoa Roman, V., Capitani, G. P., Romeo, G. Cara, Carena, F., Carena, W., Carminati, F., Casanova Díaz, A., Caselle, M., Castillo Castellanos, J., Castillo Hernandez, J. F., Catanescu, V., Cattaruzza, E., Cavicchioli, C., Cerello, P., Chambert, V., Chang, B., Chapeland, S., Charpy, A., Charvet, J. L., Chattopadhyay, S., Chattopadhyay, S., Cherney, M., Cheshkov, C., Cheynis, B., Chiavassa, E., Chibante Barroso, V., Chinellato, D. D., Chochula, P., Choi, K., Chojnacki, M., Christakoglou, P., Christensen, C. H., Christiansen, P., Chujo, T., Chuman, F., Cicalo, C., Cifarelli, L., Cindolo, F., Cleymans, J., Cobanoglu, O., Coffin, J.-P., Coli, S., Colla, A., Conesa Balbastre, G., Conesa del Valle, Z., Conner, E. S., Constantin, P., Contin, G., Contreras, J. G., Corrales Morales, Y., Cormier, T. M., Cortese, P., Cortés Maldonado, I., Cosentino, M. R., Costa, F., Cotallo, M. E., Crescio, E., Crochet, P., Cuautle, E., Cunqueiro, L., Cussonneau, J., Dainese, A., Dalsgaard, H. H., Danu, A., Das, I., Dash, A., Dash, S., de Barros, G. O. V., De Caro, A., de Cataldo, G., de Cuveland, J., De Falco, A., De Gaspari, M., de Groot, J., De Gruttola, D., De Marco, N., De Pasquale, S., De Remigis, R., de Rooij, R., de Vaux, G., Delagrange, H., Delgado, Y., Dellacasa, G., Deloff, A., Demanov, V., Dénes, E., Deppman, A., D’Erasmo, G., Derkach, D., Devaux, A., Di Bari, D., Di Giglio, C., Di Liberto, S., Di Mauro, A., Di Nezza, P., Dialinas, M., Díaz, L., Díaz, R., Dietel, T., Divià, R., Djuvsland, Ø., Dobretsov, V., Dobrin, A., Dobrowolski, T., Dönigus, B., Domínguez, I., Don, D. M. M., Dordic, O., Dubey, A. K., Dubuisson, J., Ducroux, L., Dupieux, P., Dutta Majumdar, A. K., Dutta Majumdar, M. R., Elia, D., Emschermann, D., Engel, H., Enokizono, A., Espagnon, B., Estienne, M., Esumi, S., Evans, D., Evrard, S., Eyyubova, G., Fabjan, C. W., Fabris, D., Faivre, J., Falchieri, D., Fantoni, A., Fasel, M., Fateev, O., Fearick, R., Fedunov, A., Fehlker, D., Fekete, V., Felea, D., Fenton-Olsen, B., Feofilov, G., Téllez, A. Fernández, Ferreiro, E. G., Ferretti, A., Ferretti, R., Figueredo, M. A. S., Filchagin, S., Fini, R., Fionda, F. M., Fiore, E. M., Floris, M., Fodor, Z., Foertsch, S., Foka, P., Fokin, S., Formenti, F., Fragiacomo, E., Fragkiadakis, M., Frankenfeld, U., Frolov, A., Fuchs, U., Furano, F., Furget, C., Fusco Girard, M., Gaardhøje, J. J., Gadrat, S., Gagliardi, M., Gago, A., Gallio, M., Ganoti, P., Ganti, M. S., Garabatos, C., García Trapaga, C., Gebelein, J., Gemme, R., Germain, M., Gheata, A., Gheata, M., Ghidini, B., Ghosh, P., Giraudo, G., Giubellino, P., Gladysz-Dziadus, E., Glasow, R., Glässel, P., Glenn, A., Jiménez, R. Gómez, González Santos, H., González-Trueba, L. H., González-Zamora, P., Gorbunov, S., Gorbunov, Y., Gotovac, S., Gottschlag, H., Grabski, V., Grajcarek, R., Grelli, A., Grigoras, A., Grigoras, C., Grigoriev, V., Grigoryan, A., Grigoryan, S., Grinyov, B., Grion, N., Gros, P., Grosse-Oetringhaus, J. F., Grossiord, J.-Y., Grosso, R., Guber, F., Guernane, R., Guerra, C., Guerzoni, B., Gulbrandsen, K., Gulkanyan, H., Gunji, T., Gupta, A., Gupta, R., Gustafsson, H.-A., Gutbrod, H., Haaland, Ø., Hadjidakis, C., Haiduc, M., Hamagaki, H., Hamar, G., Hamblen, J., Han, B. H., Harris, J. W., Hartig, M., Harutyunyan, A., Hasch, D., Hasegan, D., Hatzifotiadou, D., Hayrapetyan, A., Heide, M., Heinz, M., Helstrup, H., Herghelegiu, A., Hernández, C., Herrera Corral, G., Herrmann, N., Hetland, K. F., Hicks, B., Hiei, A., Hille, P. T., Hippolyte, B., Horaguchi, T., Hori, Y., Hristov, P., Hřivnáčová, I., Hu, S., Huang, M., Huber, S., Humanic, T. J., Hutter, D., Hwang, D. S., Ichou, R., Ilkaev, R., Ilkiv, I., Inaba, M., Innocenti, P. G., Ippolitov, M., Irfan, M., Ivan, C., Ivanov, A., Ivanov, M., Ivanov, V., Iwasaki, T., Jachołkowski, A., Jacobs, P., Jančurová, L., Jangal, S., Janik, R., Jena, C., Jena, S., Jirden, L., Jones, G. T., Jones, P. G., Jovanović, P., Jung, H., Jung, W., Jusko, A., Kaidalov, A. B., Kalcher, S., Kaliňák, P., Kalisky, M., Kalliokoski, T., Kalweit, A., Kamal, A., Kamermans, R., Kanaki, K., Kang, E., Kang, J. H., Kapitan, J., Kaplin, V., Kapusta, S., Karavichev, O., Karavicheva, T., Karpechev, E., Kazantsev, A., Kebschull, U., Keidel, R., Khan, M. M., Khan, S. A., Khanzadeev, A., Kharlov, Y., Kikola, D., Kileng, B., Kim, D. J., Kim, D. S., Kim, D. W., Kim, H. N., Kim, J., Kim, J. H., Kim, J. S., Kim, M., Kim, M., Kim, S. H., Kim, S., Kim, Y., Kirsch, S., Kisel, I., Kiselev, S., Kisiel, A., Klay, J. L., Klein, J., Klein-Bösing, C., Kliemant, M., Klovning, A., Kluge, A., Knichel, M. L., Kniege, S., Koch, K., Kolevatov, R., Kolojvari, A., Kondratiev, V., Kondratyeva, N., Konevskih, A., Kornaś, E., Kour, R., Kowalski, M., Kox, S., Kozlov, K., Kral, J., Králik, I., Kramer, F., Kraus, I., Kravčáková, A., Krawutschke, T., Krivda, M., Krumbhorn, D., Krus, M., Kryshen, E., Krzewicki, M., Kucheriaev, Y., Kuhn, C., Kuijer, P. G., Kumar, L., Kumar, N., Kupczak, R., Kurashvili, P., Kurepin, A., Kurepin, A. N., Kuryakin, A., Kushpil, S., Kushpil, V., Kutouski, M., Kvaerno, H., Kweon, M. J., Kwon, Y., La Rocca, P., Lackner, F., de Guevara, P. Ladrón, Lafage, V., Lal, C., Lara, C., Larsen, D. T., Laurenti, G., Lazzeroni, C., Le Bornec, Y., Le Bris, N., Lee, H., Lee, K. S., Lee, S. C., Lefèvre, F., Lenhardt, M., Leistam, L., Lehnert, J., Lenti, V., León, H., Monzón, I. León, Vargas, H. León, Lévai, P., Li, X., Li, Y., Lietava, R., Lindal, S., Lindenstruth, V., Lippmann, C., Lisa, M. A., Liu, L., Loginov, V., Lohn, S., Lopez, X., López Noriega, M., López-Ramírez, R., López Torres, E., Løvhøiden, G., Lozea Feijo Soares, A., Lu, S., Lunardon, M., Luparello, G., Luquin, L., Lutz, J.-R., Ma, K., Ma, R., Madagodahettige-Don, D. M., Maevskaya, A., Mager, M., Mahapatra, D. P., Maire, A., Makhlyueva, I., Mal’Kevich, D., Malaev, M., Malagalage, K. J., Maldonado Cervantes, I., Malek, M., Malkiewicz, T., Malzacher, P., Mamonov, A., Manceau, L., Mangotra, L., Manko, V., Manso, F., Manzari, V., Mao, Y., Mareš, J., Margagliotti, G. V., Margotti, A., Marín, A., Martashvili, I., Martinengo, P., Martínez Hernández, M. I., Martínez Davalos, A., Martínez García, G., Maruyama, Y., Marzari Chiesa, A., Masciocchi, S., Masera, M., Masetti, M., Masoni, A., Massacrier, L., Mastromarco, M., Mastroserio, A., Matthews, Z. L., Matyja, A., Mayani, D., Mazza, G., Mazzoni, M. A., Meddi, F., Menchaca-Rocha, A., Mendez Lorenzo, P., Meoni, M., Mercado Pérez, J., Mereu, P., Miake, Y., Michalon, A., Miftakhov, N., Milano, L., Milosevic, J., Minafra, F., Mischke, A., Miśkowiec, D., Mitu, C., Mizoguchi, K., Mlynarz, J., Mohanty, B., Molnar, L., Mondal, M. M., Montaño Zetina, L., Monteno, M., Montes, E., Morando, M., Moretto, S., Morsch, A., Moukhanova, T., Muccifora, V., Mudnic, E., Muhuri, S., Müller, H., Munhoz, M. G., Munoz, J., Musa, L., Musso, A., Nandi, B. K., Nania, R., Nappi, E., Navach, F., Navin, S., Nayak, T. K., Nazarenko, S., Nazarov, G., Nedosekin, A., Nendaz, F., Newby, J., Nianine, A., Nicassio, M., Nielsen, B. S., Nikolaev, S., Nikolic, V., Nikulin, S., Nikulin, V., Nilsen, B. S., Nilsson, M. S., Noferini, F., Nomokonov, P., Nooren, G., Novitzky, N., Nyatha, A., Nygaard, C., Nyiri, A., Nystrand, J., Ochirov, A., Odyniec, G., Oeschler, H., Oinonen, M., Okada, K., Okada, Y., Oldenburg, M., Oleniacz, J., Oppedisano, C., Orsini, F., Ortiz Velasquez, A., Ortona, G., Oskarsson, A., Osmic, F., Österman, L., Ostrowski, P., Otterlund, I., Otwinowski, J., Øvrebekk, G., Oyama, K., Ozawa, K., Pachmayer, Y., Pachr, M., Padilla, F., Pagano, P., Paić, G., Painke, F., Pajares, C., Pal, S., Pal, S. K., Palaha, A., Palmeri, A., Panse, R., Papikyan, V., Pappalardo, G. S., Park, W. J., Pastirčák, B., Pastore, C., Paticchio, V., Pavlinov, A., Pawlak, T., Peitzmann, T., Pepato, A., Pereira, H., Peressounko, D., Pérez, C., Perini, D., Perrino, D., Peryt, W., Peschek, J., Pesci, A., Peskov, V., Pestov, Y., Peters, A. J., Petráček, V., Petridis, A., Petris, M., Petrov, P., Petrovici, M., Petta, C., Peyré, J., Piano, S., Piccotti, A., Pikna, M., Pillot, P., Pinazza, O., Pinsky, L., Pitz, N., Piuz, F., Platt, R., Płoskoń, M., Pluta, J., Pocheptsov, T., Pochybova, S., Podesta Lerma, P. L. M., Poggio, F., Poghosyan, M. G., Polák, K., Polichtchouk, B., Polozov, P., Polyakov, V., Pommeresch, B., Pop, A., Posa, F., Pospíšil, V., Potukuchi, B., Pouthas, J., Prasad, S. K., Preghenella, R., Prino, F., Pruneau, C. A., Pshenichnov, I., Puddu, G., Pujahari, P., Pulvirenti, A., Punin, A., Punin, V., Putiš, M., Putschke, J., Quercigh, E., Rachevski, A., Rademakers, A., Radomski, S., Räihä, T. S., Rak, J., Rakotozafindrabe, A., Ramello, L., Ramírez Reyes, A., Rammler, M., Raniwala, R., Raniwala, S., Räsänen, S. S., Rashevskaya, I., Rath, S., Read, K. F., Real, J. S., Redlich, K., Renfordt, R., Reolon, A. R., Reshetin, A., Rettig, F., Revol, J.-P., Reygers, K., Ricaud, H., Riccati, L., Ricci, R. A., Richter, M., Riedler, P., Riegler, W., Riggi, F., Rivetti, A., Cahuantzi, M. Rodriguez, Røed, K., Röhrich, D., López, S. Román, Romita, R., Ronchetti, F., Rosinský, P., Rosnet, P., Rossegger, S., Rossi, A., Roukoutakis, F., Rousseau, S., Roy, C., Roy, P., Rubio-Montero, A. J., Rui, R., Rusanov, I., Russo, G., Ryabinkin, E., Rybicki, A., Sadovsky, S., Šafařík, K., Sahoo, R., Saini, J., Saiz, P., Sakata, D., Salgado, C. A., Salgueiro Domingues da Silva, R., Salur, S., Samanta, T., Sambyal, S., Samsonov, V., Šándor, L., Sandoval, A., Sano, M., Sano, S., Santo, R., Santoro, R., Sarkamo, J., Saturnini, P., Scapparone, E., Scarlassara, F., Scharenberg, R. P., Schiaua, C., Schicker, R., Schindler, H., Schmidt, C., Schmidt, H. R., Schossmaier, K., Schreiner, S., Schuchmann, S., Schukraft, J., Schutz, Y., Schwarz, K., Schweda, K., Scioli, G., Scomparin, E., Scott, P. A., Segato, G., Semenov, D., Senyukov, S., Seo, J., Serci, S., Serkin, L., Serradilla, E., Sevcenco, A., Sgura, I., Shabratova, G., Shahoyan, R., Sharkov, G., Sharma, N., Sharma, S., Shigaki, K., Shimomura, M., Shtejer, K., Sibiriak, Y., Siciliano, M., Sicking, E., Siddi, E., Siemiarczuk, T., Silenzi, A., Silvermyr, D., Simili, E., Simonetti, G., Singaraju, R., Singh, R., Singhal, V., Sinha, B. C., Sinha, T., Sitar, B., Sitta, M., Skaali, T. B., Skjerdal, K., Smakal, R., Smirnov, N., Snellings, R., Snow, H., Søgaard, C., Soloviev, A., Soltveit, H. K., Soltz, R., Sommer, W., Son, C. W., Son, H., Song, M., Soos, C., Soramel, F., Soyk, D., Spyropoulou-Stassinaki, M., Srivastava, B. K., Stachel, J., Staley, F., Stan, E., Stefanek, G., Stefanini, G., Steinbeck, T., Stenlund, E., Steyn, G., Stocco, D., Stock, R., Stolpovsky, P., Strmen, P., Suaide, A. A. P., Subieta Vásquez, M. A., Sugitate, T., Suire, C., Šumbera, M., Susa, T., Swoboda, D., Symons, J., Szanto de Toledo, A., Szarka, I., Szostak, A., Szuba, M., Tadel, M., Tagridis, C., Takahara, A., Takahashi, J., Tanabe, R., Tapia Takaki, J. D., Taureg, H., Tauro, A., Tavlet, M., Tejeda Muñoz, G., Telesca, A., Terrevoli, C., Thäder, J., Tieulent, R., Tlusty, D., Toia, A., Tolyhy, T., Torcato de Matos, C., Torii, H., Torralba, G., Toscano, L., Tosello, F., Tournaire, A., Traczyk, T., Tribedy, P., Tröger, G., Truesdale, D., Trzaska, W. H., Tsiledakis, G., Tsilis, E., Tsuji, T., Tumkin, A., Turrisi, R., Turvey, A., Tveter, T. S., Tydesjö, H., Tywoniuk, K., Ulery, J., Ullaland, K., Uras, A., Urbán, J., Urciuoli, G. M., Usai, G. L., Vacchi, A., Vala, M., Palomo, L. Valencia, Vallero, S., van der Kolk, N., Vyvre, P. Vande, van Leeuwen, M., Vannucci, L., Vargas, A., Varma, R., Vasiliev, A., Vassiliev, I., Vasileiou, M., Vechernin, V., Venaruzzo, M., Vercellin, E., Vergara, S., Vernet, R., Verweij, M., Vetlitskiy, I., Vickovic, L., Viesti, G., Vikhlyantsev, O., Vilakazi, Z., Villalobos Baillie, O., Vinogradov, A., Vinogradov, L., Vinogradov, Y., Virgili, T., Viyogi, Y. P., Vodopianov, A., Voloshin, K., Voloshin, S., Volpe, G., von Haller, B., Vranic, D., Vrláková, J., Vulpescu, B., Wagner, B., Wagner, V., Wallet, L., Wan, R., Wang, D., Wang, Y., Wang, Y., Watanabe, K., Wen, Q., Wessels, J., Westerhoff, U., Wiechula, J., Wikne, J., Wilk, A., Wilk, G., Williams, M. C. S., Willis, N., Windelband, B., Xu, C., Yang, C., Yang, H., Yasnopolskiy, S., Yermia, F., Yi, J., Yin, Z., Yokoyama, H., Yoo, I.-K., Yuan, X., Yurevich, V., Yushmanov, I., Zabrodin, E., Zagreev, B., Zalite, A., Zampolli, C., Zanevsky, Y., Zaporozhets, S., Zarochentsev, A., Závada, P., Zbroszczyk, H., Zelnicek, P., Zenin, A., Zepeda, A., Zgura, I., Zhalov, M., Zhang, X., Zhou, D., Zhou, S., Zhu, J., Zichichi, A., Zinchenko, A., Zinovjev, G., Zoccarato, Y., Zycháček, V., Zynovyev, M., and The ALICE Collaboration

Published
2011
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29. [formula omitted] electronics and data acquisition (forward-angle measurements)

Author

Marchand, D., Arvieux, J., Batigne, G., Bimbot, L., Biselli, A., Bouvier, J., Breuer, H., Clark, R., Cuzon, J.-C., Engrand, M., Foglio, R., Furget, C., Grave, X., Guillon, B., Guler, H., King, P.M., Kox, S., Kuhn, J., Ky, Y., Lachniet, J., Lenoble, J., Liatard, E., Liu, J., Munoz, E., Pouxe, J., Quéméner, G., Quinn, B., Réal, J.-S., Rossetto, O., and Sellem, R.

Published
2008
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30. Charged-particle multiplicity measurement in proton–proton collisions at $\sqrt{s}=7$ TeV with ALICE at LHC

Author

Aamodt, K., Abel, N., Abeysekara, U., Abrahantes Quintana, A., Abramyan, A., Adamová, D., Aggarwal, M. M., Aglieri Rinella, G., Agocs, A. G., Aguilar Salazar, S., Ahammed, Z., Ahmad, A., Ahmad, N., Ahn, S. U., Akimoto, R., Akindinov, A., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Alici, A., Almaráz Aviña, E., Alme, J., Alt, T., Altini, V., Altinpinar, S., Andrei, C., Andronic, A., Anelli, G., Angelov, V., Anson, C., Antičić, T., Antinori, F., Antinori, S., Antipin, K., Antończyk, D., Antonioli, P., Anzo, A., Aphecetche, L., Appelshäuser, H., Arcelli, S., Arceo, R., Arend, A., Armesto, N., Arnaldi, R., Aronsson, T., Arsene, I. C., Asryan, A., Augustinus, A., Averbeck, R., Awes, T. C., Äystö, J., Azmi, M. D., Bablok, S., Bach, M., Badalà, A., Baek, Y. W., Bagnasco, S., Bailhache, R., Bala, R., Baldisseri, A., Baldit, A., Bán, J., Barbera, R., Barnaföldi, G. G., Barnby, L., Barret, V., Bartke, J., Barile, F., Basile, M., Basmanov, V., Bastid, N., Bathen, B., Batigne, G., Batyunya, B., Baumann, C., Bearden, I. G., Becker, B., Belikov, I., Bellwied, R., Belmont-Moreno, E., Belogianni, A., Benhabib, L., Beole, S., Berceanu, I., Bercuci, A., Berdermann, E., Berdnikov, Y., Betev, L., Bhasin, A., Bhati, A. K., Bianchi, L., Bianchi, N., Bianchin, C., Bielčík, J., Bielčíková, J., Bilandzic, A., Bimbot, L., Biolcati, E., Blanc, A., Blanco, F., Blanco, F., Blau, D., Blume, C., Boccioli, M., Bock, N., Bogdanov, A., Bøggild, H., Bogolyubsky, M., Bohm, J., Boldizsár, L., Bombara, M., Bombonati, C., Bondila, M., Borel, H., Borisov, A., Bortolin, C., Bose, S., Bosisio, L., Bossú, F., Botje, M., Böttger, S., Bourdaud, G., Boyer, B., Braun, M., Braun-Munzinger, P., Bravina, L., Bregant, M., Breitner, T., Bruckner, G., Brun, R., Bruna, E., Bruno, G. E., Budnikov, D., Buesching, H., Buncic, P., Busch, O., Buthelezi, Z., Caffarri, D., Cai, X., Caines, H., Camacho, E., Camerini, P., Campbell, M., Canoa Roman, V., Capitani, G. P., Cara Romeo, G., Carena, F., Carena, W., Carminati, F., Casanova Díaz, A., Caselle, M., Castillo Castellanos, J., Castillo Hernandez, J. F., Catanescu, V., Cattaruzza, E., Cavicchioli, C., Cerello, P., Chambert, V., Chang, B., Chapeland, S., Charpy, A., Charvet, J. L., Chattopadhyay, S., Chattopadhyay, S., Cherney, M., Cheshkov, C., Cheynis, B., Chiavassa, E., Chibante Barroso, V., Chinellato, D. D., Chochula, P., Choi, K., Chojnacki, M., Christakoglou, P., Christensen, C. H., Christiansen, P., Chujo, T., Chuman, F., Cicalo, C., Cifarelli, L., Cindolo, F., Cleymans, J., Cobanoglu, O., Coffin, J.-P., Coli, S., Colla, A., Conesa Balbastre, G., Conesa del Valle, Z., Conner, E. S., Constantin, P., Contin, G., Contreras, J. G., Corrales Morales, Y., Cormier, T. M., Cortese, P., Cortés Maldonado, I., Cosentino, M. 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W., Fabris, D., Faivre, J., Falchieri, D., Fantoni, A., Fasel, M., Fateev, O., Fearick, R., Fedunov, A., Fehlker, D., Fekete, V., Felea, D., Fenton-Olsen, B., Feofilov, G., Fernández Téllez, A., Ferreiro, E. G., Ferretti, A., Ferretti, R., Figueredo, M. A. S., Filchagin, S., Fini, R., Fionda, F. M., Fiore, E. M., Floris, M., Fodor, Z., Foertsch, S., Foka, P., Fokin, S., Formenti, F., Fragiacomo, E., Fragkiadakis, M., Frankenfeld, U., Frolov, A., Fuchs, U., Furano, F., Furget, C., Fusco Girard, M., Gaardhøje, J. J., Gadrat, S., Gagliardi, M., Gago, A., Gallio, M., Ganoti, P., Ganti, M. S., Garabatos, C., García Trapaga, C., Gebelein, J., Gemme, R., Germain, M., Gheata, A., Gheata, M., Ghidini, B., Ghosh, P., Giraudo, G., Giubellino, P., Gladysz-Dziadus, E., Glasow, R., Glässel, P., Glenn, A., Gómez Jiménez, R., González Santos, H., González-Trueba, L. H., González-Zamora, P., Gorbunov, S., Gorbunov, Y., Gotovac, S., Gottschlag, H., Grabski, V., Grajcarek, R., Grelli, A., Grigoras, A., Grigoras, C., Grigoriev, V., Grigoryan, A., Grigoryan, S., Grinyov, B., Grion, N., Gros, P., Grosse-Oetringhaus, J. F., Grossiord, J.-Y., Grosso, R., Guber, F., Guernane, R., Guerzoni, B., Gulbrandsen, K., Gulkanyan, H., Gunji, T., Gupta, A., Gupta, R., Gustafsson, H.-A., Gutbrod, H., Haaland, Ø., Hadjidakis, C., Haiduc, M., Hamagaki, H., Hamar, G., Hamblen, J., Han, B. H., Harris, J. W., Hartig, M., Harutyunyan, A., Hasch, D., Hasegan, D., Hatzifotiadou, D., Hayrapetyan, A., Heide, M., Heinz, M., Helstrup, H., Herghelegiu, A., Hernández, C., Herrera Corral, G., Herrmann, N., Hetland, K. F., Hicks, B., Hiei, A., Hille, P. T., Hippolyte, B., Horaguchi, T., Hori, Y., Hristov, P., Hřivnáčová, I., Hu, S., Huang, M., Huber, S., Humanic, T. J., Hutter, D., Hwang, D. S., Ichou, R., Ilkaev, R., Ilkiv, I., Inaba, M., Innocenti, P. 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L., Kniege, S., Koch, K., Kolevatov, R., Kolojvari, A., Kondratiev, V., Kondratyeva, N., Konevskih, A., Kornaś, E., Kour, R., Kowalski, M., Kox, S., Kozlov, K., Kral, J., Králik, I., Kramer, F., Kraus, I., Kravčáková, A., Krawutschke, T., Krivda, M., Krumbhorn, D., Krus, M., Kryshen, E., Krzewicki, M., Kucheriaev, Y., Kuhn, C., Kuijer, P. G., Kumar, L., Kumar, N., Kupczak, R., Kurashvili, P., Kurepin, A., Kurepin, A. N., Kuryakin, A., Kushpil, S., Kushpil, V., Kutouski, M., Kvaerno, H., Kweon, M. J., Kwon, Y., La Rocca, P., Lackner, F., Ladrón de Guevara, P., Lafage, V., Lal, C., Lara, C., Larsen, D. T., Laurenti, G., Lazzeroni, C., Le Bornec, Y., Le Bris, N., Lee, H., Lee, K. S., Lee, S. C., Lefèvre, F., Lenhardt, M., Leistam, L., Lehnert, J., Lenti, V., León, H., León Monzón, I., León Vargas, H., Lévai, P., Li, X., Li, Y., Lietava, R., Lindal, S., Lindenstruth, V., Lippmann, C., Lisa, M. A., Liu, L., Loginov, V., Lohn, S., Lopez, X., López Noriega, M., López-Ramírez, R., López Torres, E., Løvhøiden, G., Lozea Feijo Soares, A., Lu, S., Lunardon, M., Luparello, G., Luquin, L., Lutz, J.-R., Ma, K., Ma, R., Madagodahettige-Don, D. M., Maevskaya, A., Mager, M., Mahapatra, D. P., Maire, A., Makhlyueva, I., Mal’Kevich, D., Malaev, M., Malagalage, K. J., Maldonado Cervantes, I., Malek, M., Malkiewicz, T., Malzacher, P., Mamonov, A., Manceau, L., Mangotra, L., Manko, V., Manso, F., Manzari, V., Mao, Y., Mareš, J., Margagliotti, G. V., Margotti, A., Marín, A., Martashvili, I., Martinengo, P., Martínez Hernández, M. I., Martínez Davalos, A., Martínez García, G., Maruyama, Y., Marzari Chiesa, A., Masciocchi, S., Masera, M., Masetti, M., Masoni, A., Massacrier, L., Mastromarco, M., Mastroserio, A., Matthews, Z. L., Matyja, A., Mayani, D., Mazza, G., Mazzoni, M. A., Meddi, F., Menchaca-Rocha, A., Mendez Lorenzo, P., Meoni, M., Mercado Pérez, J., Mereu, P., Miake, Y., Michalon, A., Miftakhov, N., Milosevic, J., Minafra, F., Mischke, A., Miśkowiec, D., Mitu, C., Mizoguchi, K., Mlynarz, J., Mohanty, B., Molnar, L., Mondal, M. M., Montaño Zetina, L., Monteno, M., Montes, E., Morando, M., Moretto, S., Morsch, A., Moukhanova, T., Muccifora, V., Mudnic, E., Muhuri, S., Müller, H., Munhoz, M. G., Munoz, J., Musa, L., Musso, A., Nandi, B. K., Nania, R., Nappi, E., Navach, F., Navin, S., Nayak, T. K., Nazarenko, S., Nazarov, G., Nedosekin, A., Nendaz, F., Newby, J., Nianine, A., Nicassio, M., Nielsen, B. S., Nikolaev, S., Nikolic, V., Nikulin, S., Nikulin, V., Nilsen, B. S., Nilsson, M. 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A., Richter, M., Riedler, P., Riegler, W., Riggi, F., Rivetti, A., Rodriguez Cahuantzi, M., Røed, K., Röhrich, D., Román López, S., Romita, R., Ronchetti, F., Rosinský, P., Rosnet, P., Rossegger, S., Rossi, A., Roukoutakis, F., Rousseau, S., Roy, C., Roy, P., Rubio-Montero, A. J., Rui, R., Rusanov, I., Russo, G., Ryabinkin, E., Rybicki, A., Sadovsky, S., Šafařík, K., Sahoo, R., Saini, J., Saiz, P., Sakata, D., Salgado, C. A., Salgueiro Domingues da Silva, R., Salur, S., Samanta, T., Sambyal, S., Samsonov, V., Šándor, L., Sandoval, A., Sano, M., Sano, S., Santo, R., Santoro, R., Sarkamo, J., Saturnini, P., Scapparone, E., Scarlassara, F., Scharenberg, R. P., Schiaua, C., Schicker, R., Schindler, H., Schmidt, C., Schmidt, H. R., Schossmaier, K., Schreiner, S., Schuchmann, S., Schukraft, J., Schutz, Y., Schwarz, K., Schweda, K., Scioli, G., Scomparin, E., Segato, G., Semenov, D., Senyukov, S., Seo, J., Serci, S., Serkin, L., Serradilla, E., Sevcenco, A., Sgura, I., Shabratova, G., Shahoyan, R., Sharkov, G., Sharma, N., Sharma, S., Shigaki, K., Shimomura, M., Shtejer, K., Sibiriak, Y., Siciliano, M., Sicking, E., Siddi, E., Siemiarczuk, T., Silenzi, A., Silvermyr, D., Simili, E., Simonetti, G., Singaraju, R., Singh, R., Singhal, V., Sinha, B. C., Sinha, T., Sitar, B., Sitta, M., Skaali, T. B., Skjerdal, K., Smakal, R., Smirnov, N., Snellings, R., Snow, H., Søgaard, C., Soloviev, A., Soltveit, H. K., Soltz, R., Sommer, W., Son, C. W., Son, H., Song, M., Soos, C., Soramel, F., Soyk, D., Spyropoulou-Stassinaki, M., Srivastava, B. K., Stachel, J., Staley, F., Stan, E., Stefanek, G., Stefanini, G., Steinbeck, T., Stenlund, E., Steyn, G., Stocco, D., Stock, R., Stolpovsky, P., Strmen, P., Suaide, A. A. P., Subieta Vásquez, M. A., Sugitate, T., Suire, C., Šumbera, M., Susa, T., Swoboda, D., Symons, J., Szanto de Toledo, A., Szarka, I., Szostak, A., Szuba, M., Tadel, M., Tagridis, C., Takahara, A., Takahashi, J., Tanabe, R., Tapia Takaki, D. J., Taureg, H., Tauro, A., Tavlet, M., Tejeda Muñoz, G., Telesca, A., Terrevoli, C., Thäder, J., Tieulent, R., Tlusty, D., Toia, A., Tolyhy, T., Torcato de Matos, C., Torii, H., Torralba, G., Toscano, L., Tosello, F., Tournaire, A., Traczyk, T., Tribedy, P., Tröger, G., Truesdale, D., Trzaska, W. H., Tsiledakis, G., Tsilis, E., Tsuji, T., Tumkin, A., Turrisi, R., Turvey, A., Tveter, T. S., Tydesjö, H., Tywoniuk, K., Ulery, J., Ullaland, K., Uras, A., Urbán, J., Urciuoli, G. M., Usai, G. L., Vacchi, A., Vala, M., Valencia Palomo, L., Vallero, S., van der Kolk, N., Vande Vyvre, P., van Leeuwen, M., Vannucci, L., Vargas, A., Varma, R., Vasiliev, A., Vassiliev, I., Vasileiou, M., Vechernin, V., Venaruzzo, M., Vercellin, E., Vergara, S., Vernet, R., Verweij, M., Vetlitskiy, I., Vickovic, L., Viesti, G., Vikhlyantsev, O., Vilakazi, Z., Villalobos Baillie, O., Vinogradov, A., Vinogradov, L., Vinogradov, Y., Virgili, T., Viyogi, Y. P., Vodopianov, A., Voloshin, K., Voloshin, S., Volpe, G., von Haller, B., Vranic, D., Vrláková, J., Vulpescu, B., Wagner, B., Wagner, V., Wallet, L., Wan, R., Wang, D., Wang, Y., Watanabe, K., Wen, Q., Wessels, J., Westerhoff, U., Wiechula, J., Wikne, J., Wilk, A., Wilk, G., Williams, M. C. S., Willis, N., Windelband, B., Xu, C., Yang, C., Yang, H., Yasnopolskiy, S., Yermia, F., Yi, J., Yin, Z., Yokoyama, H., Yoo, I.-K., Yuan, X., Yurevich, V., Yushmanov, I., Zabrodin, E., Zagreev, B., Zalite, A., Zampolli, C., Zanevsky, Yu., Zaporozhets, S., Zarochentsev, A., Závada, P., Zbroszczyk, H., Zelnicek, P., Zenin, A., Zepeda, A., Zgura, I., Zhalov, M., Zhang, X., Zhou, D., Zhou, S., Zhu, J., Zichichi, A., Zinchenko, A., Zinovjev, G., Zoccarato, Y., Zycháček, V., Zynovyev, M., and The ALICE Collaboration

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2010
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31. Charged-particle multiplicity measurement in proton–proton collisions at $\sqrt{s}=0.9$ and 2.36 TeV with ALICE at LHC

Author

Aamodt, K., Abel, N., Abeysekara, U., Abrahantes Quintana, A., Abramyan, A., Adamová, D., Aggarwal, M. M., Aglieri Rinella, G., Agocs, A. G., Aguilar Salazar, S., Ahammed, Z., Ahmad, A., Ahmad, N., Ahn, S. U., Akimoto, R., Akindinov, A., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Alici, A., Almaráz Aviña, E., Alme, J., Alt, T., Altini, V., Altinpinar, S., Andrei, C., Andronic, A., Anelli, G., Angelov, V., Anson, C., Antičić, T., Antinori, F., Antinori, S., Antipin, K., Antończyk, D., Antonioli, P., Anzo, A., Aphecetche, L., Appelshäuser, H., Arcelli, S., Arceo, R., Arend, A., Armesto, N., Arnaldi, R., Aronsson, T., Arsene, I. C., Asryan, A., Augustinus, A., Averbeck, R., Awes, T. C., Äystö, J., Azmi, M. D., Bablok, S., Bach, M., Badalà, A., Baek, Y. W., Bagnasco, S., Bailhache, R., Bala, R., Baldisseri, A., Baldit, A., Bán, J., Barbera, R., Barnaföldi, G. G., Barnby, L., Barret, V., Bartke, J., Barile, F., Basile, M., Basmanov, V., Bastid, N., Bathen, B., Batigne, G., Batyunya, B., Baumann, C., Bearden, I. G., Becker, B., Belikov, I., Bellwied, R., Belmont-Moreno, E., Belogianni, A., Benhabib, L., Beole, S., Berceanu, I., Bercuci, A., Berdermann, E., Berdnikov, Y., Betev, L., Bhasin, A., Bhati, A. K., Bianchi, L., Bianchi, N., Bianchin, C., Bielčík, J., Bielčíková, J., Bilandzic, A., Bimbot, L., Biolcati, E., Blanc, A., Blanco, F., Blanco, F., Blau, D., Blume, C., Boccioli, M., Bock, N., Bogdanov, A., Bøggild, H., Bogolyubsky, M., Bohm, J., Boldizsár, L., Bombara, M., Bombonati, C., Bondila, M., Borel, H., Borshchov, V., Borisov, A., Bortolin, C., Bose, S., Bosisio, L., Bossú, F., Botje, M., Böttger, S., Bourdaud, G., Boyer, B., Braun, M., Braun-Munzinger, P., Bravina, L., Bregant, M., Breitner, T., Bruckner, G., Brun, R., Bruna, E., Bruno, G. E., Budnikov, D., Buesching, H., Buncic, P., Busch, O., Buthelezi, Z., Caffarri, D., Cai, X., Caines, H., Camacho, E., Camerini, P., Campbell, M., Canoa Roman, V., Capitani, G. P., Cara Romeo, G., Carena, F., Carena, W., Carminati, F., Casanova Díaz, A., Caselle, M., Castillo Castellanos, J., Castillo Hernandez, J. F., Catanescu, V., Cattaruzza, E., Cavicchioli, C., Cerello, P., Chambert, V., Chang, B., Chapeland, S., Charpy, A., Charvet, J. L., Chattopadhyay, S., Chattopadhyay, S., Cherney, M., Cheshkov, C., Cheynis, B., Chiavassa, E., Chibante Barroso, V., Chinellato, D. D., Chochula, P., Choi, K., Chojnacki, M., Christakoglou, P., Christensen, C. H., Christiansen, P., Chujo, T., Chuman, F., Cicalo, C., Cifarelli, L., Cindolo, F., Cleymans, J., Cobanoglu, O., Coffin, J.-P., Coli, S., Colla, A., Conesa Balbastre, G., Conesa del Valle, Z., Conner, E. S., Constantin, P., Contin, G., Contreras, J. G., Corrales Morales, Y., Cormier, T. M., Cortese, P., Cortés Maldonado, I., Cosentino, M. R., Costa, F., Cotallo, M. E., Crescio, E., Crochet, P., Cuautle, E., Cunqueiro, L., Cussonneau, J., Dainese, A., Dalsgaard, H. H., Danu, A., Das, I., Das, S., Dash, A., Dash, S., de Barros, G. O. V., De Caro, A., de Cataldo, G., de Cuveland, J., De Falco, A., De Gaspari, M., de Groot, J., De Gruttola, D., De Marco, N., De Pasquale, S., De Remigis, R., de Rooij, R., de Vaux, G., Delagrange, H., Dellacasa, G., Deloff, A., Demanov, V., Dénes, E., Deppman, A., D’Erasmo, G., Derkach, D., Devaux, A., Di Bari, D., Di Giglio, C., Di Liberto, S., Di Mauro, A., Di Nezza, P., Dialinas, M., Díaz, L., Díaz, R., Dietel, T., Divià, R., Djuvsland, Ø., Dobretsov, V., Dobrin, A., Dobrowolski, T., Dönigus, B., Domínguez, I., Don, D. M. M., Dordic, O., Dubey, A. K., Dubuisson, J., Ducroux, L., Dupieux, P., Dutta Majumdar, A. K., Dutta Majumdar, M. R., Elia, D., Emschermann, D., Enokizono, A., Espagnon, B., Estienne, M., Esumi, S., Evans, D., Evrard, S., Eyyubova, G., Fabjan, C. W., Fabris, D., Faivre, J., Falchieri, D., Fantoni, A., Fasel, M., Fateev, O., Fearick, R., Fedunov, A., Fehlker, D., Fekete, V., Felea, D., Fenton-Olsen, B., Feofilov, G., Fernández Téllez, A., Ferreiro, E. G., Ferretti, A., Ferretti, R., Figueredo, M. A. S., Filchagin, S., Fini, R., Fionda, F. M., Fiore, E. M., Floris, M., Fodor, Z., Foertsch, S., Foka, P., Fokin, S., Formenti, F., Fragiacomo, E., Fragkiadakis, M., Frankenfeld, U., Frolov, A., Fuchs, U., Furano, F., Furget, C., Fusco Girard, M., Gaardhøje, J. J., Gadrat, S., Gagliardi, M., Gago, A., Gallio, M., Ganoti, P., Ganti, M. S., Garabatos, C., García Trapaga, C., Gebelein, J., Gemme, R., Germain, M., Gheata, A., Gheata, M., Ghidini, B., Ghosh, P., Giraudo, G., Giubellino, P., Gladysz-Dziadus, E., Glasow, R., Glässel, P., Glenn, A., Gómez Jiménez, R., González Santos, H., González-Trueba, L. H., González-Zamora, P., Gorbunov, S., Gorbunov, Y., Gotovac, S., Gottschlag, H., Grabski, V., Grajcarek, R., Grelli, A., Grigoras, A., Grigoras, C., Grigoriev, V., Grigoryan, A., Grigoryan, S., Grinyov, B., Grion, N., Gros, P., Grosse-Oetringhaus, J. F., Grossiord, J.-Y., Grosso, R., Guber, F., Guernane, R., Guerzoni, B., Gulbrandsen, K., Gulkanyan, H., Gunji, T., Gupta, A., Gupta, R., Gustafsson, H.-A., Gutbrod, H., Haaland, Ø., Hadjidakis, C., Haiduc, M., Hamagaki, H., Hamar, G., Hamblen, J., Han, B. H., Harris, J. W., Hartig, M., Harutyunyan, A., Hasch, D., Hasegan, D., Hatzifotiadou, D., Hayrapetyan, A., Heide, M., Heinz, M., Helstrup, H., Herghelegiu, A., Hernández, C., Herrera Corral, G., Herrmann, N., Hetland, K. F., Hicks, B., Hiei, A., Hille, P. T., Hippolyte, B., Horaguchi, T., Hori, Y., Hristov, P., Hřivnáčová, I., Hu, S., Huang, M., Huber, S., Humanic, T. J., Hutter, D., Hwang, D. S., Ichou, R., Ilkaev, R., Ilkiv, I., Inaba, M., Innocenti, P. G., Ippolitov, M., Irfan, M., Ivan, C., Ivanov, A., Ivanov, M., Ivanov, V., Iwasaki, T., Jachołkowski, A., Jacobs, P., Jančurová, L., Jangal, S., Janik, R., Jena, C., Jena, S., Jirden, L., Jones, G. T., Jones, P. G., Jovanović, P., Jung, H., Jung, W., Jusko, A., Kaidalov, A. B., Kalcher, S., Kaliňák, P., Kalisky, M., Kalliokoski, T., Kalweit, A., Kamal, A., Kamermans, R., Kanaki, K., Kang, E., Kang, J. H., Kapitan, J., Kaplin, V., Kapusta, S., Karavichev, O., Karavicheva, T., Karpechev, E., Kazantsev, A., Kebschull, U., Keidel, R., Khan, M. M., Khan, S. A., Khanzadeev, A., Kharlov, Y., Kikola, D., Kileng, B., Kim, D. J., Kim, D. S., Kim, D. W., Kim, H. N., Kim, J., Kim, J. H., Kim, J. S., Kim, M., Kim, M., Kim, S. H., Kim, S., Kim, Y., Kirsch, S., Kisel, I., Kiselev, S., Kisiel, A., Klay, J. L., Klein, J., Klein-Bösing, C., Kliemant, M., Klovning, A., Kluge, A., Kniege, S., Koch, K., Kolevatov, R., Kolojvari, A., Kondratiev, V., Kondratyeva, N., Konevskih, A., Kornaś, E., Kour, R., Kowalski, M., Kox, S., Kozlov, K., Kral, J., Králik, I., Kramer, F., Kraus, I., Kravčáková, A., Krawutschke, T., Krivda, M., Krumbhorn, D., Krus, M., Kryshen, E., Krzewicki, M., Kucheriaev, Y., Kuhn, C., Kuijer, P. G., Kumar, L., Kumar, N., Kupczak, R., Kurashvili, P., Kurepin, A., Kurepin, A. N., Kuryakin, A., Kushpil, S., Kushpil, V., Kutouski, M., Kvaerno, H., Kweon, M. J., Kwon, Y., La Rocca, P., Lackner, F., Ladrón de Guevara, P., Lafage, V., Lal, C., Lara, C., Larsen, D. T., Laurenti, G., Lazzeroni, C., Le Bornec, Y., Le Bris, N., Lee, H., Lee, K. S., Lee, S. C., Lefèvre, F., Lenhardt, M., Leistam, L., Lehnert, J., Lenti, V., León, H., León Monzón, I., León Vargas, H., Lévai, P., Li, X., Li, Y., Lietava, R., Lindal, S., Lindenstruth, V., Lippmann, C., Lisa, M. A., Listratenko, O., Liu, L., Loginov, V., Lohn, S., Lopez, X., López Noriega, M., López-Ramírez, R., López Torres, E., Løvhøiden, G., Lozea Feijo Soares, A., Lu, S., Lunardon, M., Luparello, G., Luquin, L., Lutz, J.-R., Ma, K., Ma, R., Madagodahettige-Don, D. M., Maevskaya, A., Mager, M., Mahapatra, D. P., Maire, A., Makhlyueva, I., Mal’Kevich, D., Malaev, M., Malagalage, K. J., Maldonado Cervantes, I., Malek, M., Malkiewicz, T., Malzacher, P., Mamonov, A., Manceau, L., Mangotra, L., Manko, V., Manso, F., Manzari, V., Mao, Y., Mareš, J., Margagliotti, G. V., Margotti, A., Marín, A., Martashvili, I., Martinengo, P., Martínez Hernández, M. I., Martínez Davalos, A., Martínez García, G., Maruyama, Y., Marzari Chiesa, A., Masciocchi, S., Masera, M., Masetti, M., Masoni, A., Massacrier, L., Mastromarco, M., Mastroserio, A., Matthews, Z. L., Matyja, A., Mayani, D., Mazza, G., Mazzoni, M. A., Meddi, F., Menchaca-Rocha, A., Mendez Lorenzo, P., Meoni, M., Mercado Pérez, J., Mereu, P., Miake, Y., Michalon, A., Miftakhov, N., Milosevic, J., Minafra, F., Mischke, A., Miśkowiec, D., Mitu, C., Mizoguchi, K., Mlynarz, J., Mohanty, B., Molnar, L., Mondal, M. M., Montaño Zetina, L., Monteno, M., Montes, E., Morando, M., Moretto, S., Morsch, A., Moukhanova, T., Muccifora, V., Mudnic, E., Muhuri, S., Müller, H., Munhoz, M. G., Munoz, J., Musa, L., Musso, A., Nandi, B. K., Nania, R., Nappi, E., Navach, F., Navin, S., Nayak, T. K., Nazarenko, S., Nazarov, G., Nedosekin, A., Nendaz, F., Newby, J., Nianine, A., Nicassio, M., Nielsen, B. S., Nikolaev, S., Nikolic, V., Nikulin, S., Nikulin, V., Nilsen, B. S., Nilsson, M. 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A., Richter, M., Riedler, P., Riegler, W., Riggi, F., Rivetti, A., Rodriguez Cahuantzi, M., Røed, K., Röhrich, D., Román López, S., Romita, R., Ronchetti, F., Rosinský, P., Rosnet, P., Rossegger, S., Rossi, A., Roukoutakis, F., Rousseau, S., Roy, C., Roy, P., Rubio-Montero, A. J., Rui, R., Rusanov, I., Russo, G., Ryabinkin, E., Rybicki, A., Sadovsky, S., Šafařík, K., Sahoo, R., Saini, J., Saiz, P., Sakata, D., Salgado, C. A., Salgueiro Domingues da Silva, R., Salur, S., Samanta, T., Sambyal, S., Samsonov, V., Šándor, L., Sandoval, A., Sano, M., Sano, S., Santo, R., Santoro, R., Sarkamo, J., Saturnini, P., Scapparone, E., Scarlassara, F., Scharenberg, R. P., Schiaua, C., Schicker, R., Schindler, H., Schmidt, C., Schmidt, H. R., Schossmaier, K., Schreiner, S., Schuchmann, S., Schukraft, J., Schutz, Y., Schwarz, K., Schweda, K., Scioli, G., Scomparin, E., Segato, G., Semenov, D., Senyukov, S., Seo, J., Serci, S., Serkin, L., Serradilla, E., Sevcenco, A., Sgura, I., Shabratova, G., Shahoyan, R., Sharkov, G., Sharma, N., Sharma, S., Shigaki, K., Shimomura, M., Shtejer, K., Sibiriak, Y., Siciliano, M., Sicking, E., Siddi, E., Siemiarczuk, T., Silenzi, A., Silvermyr, D., Simili, E., Simonetti, G., Singaraju, R., Singh, R., Singhal, V., Sinha, B. C., Sinha, T., Sitar, B., Sitta, M., Skaali, T. B., Skjerdal, K., Smakal, R., Smirnov, N., Snellings, R., Snow, H., Søgaard, C., Soloviev, A., Soltveit, H. K., Soltz, R., Sommer, W., Son, C. W., Son, H., Song, M., Soos, C., Soramel, F., Soyk, D., Spyropoulou-Stassinaki, M., Srivastava, B. K., Stachel, J., Staley, F., Stan, E., Stefanek, G., Stefanini, G., Steinbeck, T., Stenlund, E., Steyn, G., Stocco, D., Stock, R., Stolpovsky, P., Strmen, P., Suaide, A. A. P., Subieta Vásquez, M. A., Sugitate, T., Suire, C., Šumbera, M., Susa, T., Swoboda, D., Symons, J., Szanto de Toledo, A., Szarka, I., Szostak, A., Szuba, M., Tadel, M., Tagridis, C., Takahara, A., Takahashi, J., Tanabe, R., Tapia Takaki, D. J., Taureg, H., Tauro, A., Tavlet, M., Tejeda Muñoz, G., Telesca, A., Terrevoli, C., Thäder, J., Tieulent, R., Tlusty, D., Toia, A., Tolyhy, T., Torcato de Matos, C., Torii, H., Torralba, G., Toscano, L., Tosello, F., Tournaire, A., Traczyk, T., Tribedy, P., Tröger, G., Truesdale, D., Trzaska, W. H., Tsiledakis, G., Tsilis, E., Tsuji, T., Tumkin, A., Turrisi, R., Turvey, A., Tveter, T. S., Tydesjö, H., Tywoniuk, K., Ulery, J., Ullaland, K., Uras, A., Urbán, J., Urciuoli, G. M., Usai, G. L., Vacchi, A., Vala, M., Valencia Palomo, L., Vallero, S., van der Kolk, N., Vande Vyvre, P., van Leeuwen, M., Vannucci, L., Vargas, A., Varma, R., Vasiliev, A., Vassiliev, I., Vasileiou, M., Vechernin, V., Venaruzzo, M., Vercellin, E., Vergara, S., Vernet, R., Verweij, M., Vetlitskiy, I., Vickovic, L., Viesti, G., Vikhlyantsev, O., Vilakazi, Z., Villalobos Baillie, O., Vinogradov, A., Vinogradov, L., Vinogradov, Y., Virgili, T., Viyogi, Y. P., Vodopianov, A., Voloshin, K., Voloshin, S., Volpe, G., von Haller, B., Vranic, D., Vrláková, J., Vulpescu, B., Wagner, B., Wagner, V., Wallet, L., Wan, R., Wang, D., Wang, Y., Watanabe, K., Wen, Q., Wessels, J., Westerhoff, U., Wiechula, J., Wikne, J., Wilk, A., Wilk, G., Williams, M. C. S., Willis, N., Windelband, B., Xu, C., Yang, C., Yang, H., Yasnopolskiy, S., Yermia, F., Yi, J., Yin, Z., Yokoyama, H., Yoo, I.-K., Yuan, X., Yurevich, V., Yushmanov, I., Zabrodin, E., Zagreev, B., Zalite, A., Zampolli, C., Zanevsky, Yu., Zaporozhets, S., Zarochentsev, A., Závada, P., Zbroszczyk, H., Zelnicek, P., Zenin, A., Zepeda, A., Zgura, I., Zhalov, M., Zhang, X., Zhou, D., Zhou, S., Zhu, J., Zichichi, A., Zinchenko, A., Zinovjev, G., Zoccarato, Y., Zycháček, V., Zynovyev, M., and The ALICE Collaboration

Published
2010
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32. First proton–proton collisions at the LHC as observed with the ALICE detector: measurement of the charged-particle pseudorapidity density at $\sqrt{s}=900$  GeV

Author

Aamodt, K., Abel, N., Abeysekara, U., Abrahantes Quintana, A., Acero, A., Adamová, D., Aggarwal, M. M., Aglieri Rinella, G., Agocs, A. G., Aguilar Salazar, S., Ahammed, Z., Ahmad, A., Ahmad, N., Ahn, S. U., Akimoto, R., Akindinov, A., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Alici, A., Almaráz Aviña, E., Alme, J., Alt, T., Altini, V., Altinpinar, S., Andrei, C., Andronic, A., Anelli, G., Angelov, V., Anson, C., Antičić, T., Antinori, F., Antinori, S., Antipin, K., Antończyk, D., Antonioli, P., Anzo, A., Aphecetche, L., Appelshäuser, H., Arcelli, S., Arceo, R., Arend, A., Armesto, N., Arnaldi, R., Aronsson, T., Arsene, I. C., Asryan, A., Augustinus, A., Averbeck, R., Awes, T. C., Äystö, J., Azmi, M. D., Bablok, S., Bach, M., Badalà, A., Baek, Y. W., Bagnasco, S., Bailhache, R., Bala, R., Baldisseri, A., Baldit, A., Bán, J., Barbera, R., Barnaföldi, G. G., Barnby, L., Barret, V., Bartke, J., Barile, F., Basile, M., Basmanov, V., Bastid, N., Bathen, B., Batigne, G., Batyunya, B., Baumann, C., Bearden, I. G., Becker, B., Belikov, I., Bellwied, R., Belmont-Moreno, E., Belogianni, A., Benhabib, L., Beole, S., Berceanu, I., Bercuci, A., Berdermann, E., Berdnikov, Y., Betev, L., Bhasin, A., Bhati, A. K., Bianchi, L., Bianchi, N., Bianchin, C., Bielčík, J., Bielčíková, J., Bilandzic, A., Bimbot, L., Biolcati, E., Blanc, A., Blanco, F., Blanco, F., Blau, D., Blume, C., Boccioli, M., Bock, N., Bøgdanov, A., Bøggild, H., Bogolyubsky, M., Bohm, J., Boldizsár, L., Bombara, M., Bombonati, C., Bondila, M., Borel, H., Borshchov, V., Bortolin, C., Bose, S., Bosisio, L., Bossú, F., Botje, M., Böttger, S., Bourdaud, G., Boyer, B., Braun, M., Braun-Munzinger, P., Bravina, L., Bregant, M., Breitner, T., Bruckner, G., Brun, R., Bruna, E., Bruno, G. E., Budnikov, D., Buesching, H., Bugaev, K., Buncic, P., Busch, O., Buthelezi, Z., Caffarri, D., Cai, X., Caines, H., Camacho, E., Camerini, P., Campbell, M., Canoa Roman, V., Capitani, G. P., Cara Romeo, G., Carena, F., Carena, W., Carminati, F., Casanova Díaz, A., Caselle, M., Castillo Castellanos, J., Castillo Hernandez, J. F., Catanescu, V., Cattaruzza, E., Cavicchioli, C., Cerello, P., Chambert, V., Chang, B., Chapeland, S., Charpy, A., Charvet, J. L., Chattopadhyay, S., Chattopadhyay, S., Cherney, M., Cheshkov, C., Cheynis, B., Chiavassa, E., Chibante Barroso, V., Chinellato, D. D., Chochula, P., Choi, K., Chojnacki, M., Christakoglou, P., Christensen, C. H., Christiansen, P., Chujo, T., Chuman, F., Cicalo, C., Cifarelli, L., Cindolo, F., Cleymans, J., Cobanoglu, O., Coffin, J.-P., Coli, S., Colla, A., Conesa Balbastre, G., Conesa del Valle, Z., Conner, E. S., Constantin, P., Contin, G., Contreras, J. G., Corrales Morales, Y., Cormier, T. M., Cortese, P., Cortés Maldonado, I., Cosentino, M. R., Costa, F., Cotallo, M. E., Crescio, E., Crochet, P., Cuautle, E., Cunqueiro, L., Cussonneau, J., Dainese, A., Dalsgaard, H. H., Danu, A., Das, I., Das, S., Dash, A., Dash, S., de Barros, G. O. V., De Caro, A., de Cataldo, G., de Cuveland, J., De Falco, A., de Gaspari, M., de Groot, J., De Gruttola, D., de Haas, A. P., De Marco, N., de Rooij, R., De Pasquale, S., de Vaux, G., Delagrange, H., Dellacasa, G., Deloff, A., Demanov, V., Dénes, E., Deppman, A., D’Erasmo, G., Derkach, D., Devaux, A., Di Bari, D., Di Giglio, C., Di Liberto, S., Di Mauro, A., Di Nezza, P., Dialinas, M., Díaz, L., Díaz, R., Dietel, T., Ding, H., Divià, R., Djuvsland, Ø., do Amaral Valdiviesso, G., Dobretsov, V., Dobrin, A., Dobrowolski, T., Dönigus, B., Domínguez, I., Don, D. M. M., Dordic, O., Dubey, A. K., Dubuisson, J., Ducroux, L., Dupieux, P., Dutta Majumdar, A. K., Dutta Majumdar, M. R., Elia, D., Emschermann, D., Enokizono, A., Espagnon, B., Estienne, M., Evans, D., Evrard, S., Eyyubova, G., Fabjan, C. W., Fabris, D., Faivre, J., Falchieri, D., Fantoni, A., Fasel, M., Fearick, R., Fedunov, A., Fehlker, D., Fekete, V., Felea, D., Fenton-Olsen, B., Feofilov, G., Fernández Téllez, A., Ferreiro, E. G., Ferretti, A., Ferretti, R., Figueredo, M. A. S., Filchagin, S., Fini, R., Fionda, F. M., Fiore, E. M., Floris, M., Fodor, Z., Foertsch, S., Foka, P., Fokin, S., Formenti, F., Fragiacomo, E., Fragkiadakis, M., Frankenfeld, U., Frolov, A., Fuchs, U., Furano, F., Furget, C., Fusco Girard, M., Gaardhøje, J. J., Gadrat, S., Gagliardi, M., Gago, A., Gallio, M., Ganoti, P., Ganti, M. S., Garabatos, C., Garc, C., Gebelein, J., Gemme, R., Germain, M., Gheata, A., Gheata, M., Ghidini, B., Ghosh, P., Giraudo, G., Giubellino, P., Gladysz-Dziadus, E., Glasow, R., Glässel, P., Glenn, A., Gomez, R., González Santos, H., González-Trueba, L. H., González-Zamora, P., Gorbunov, S., Gorbunov, Y., Gotovac, S., Gottschlag, H., Grabski, V., Grajcarek, R., Grelli, A., Grigoras, A., Grigoras, C., Grigoriev, V., Grigoryan, A., Grinyov, B., Grion, N., Gros, P., Grosse-Oetringhaus, J. F., Grossiord, J.-Y., Grosso, R., Guarnaccia, C., Guber, F., Guernane, R., Guerzoni, B., Gulbrandsen, K., Gulkanyan, H., Gunji, T., Gupta, A., Gupta, R., Gustafsson, H.-A., Gutbrod, H., Haaland, Ø., Hadjidakis, C., Haiduc, M., Hamagaki, H., Hamar, G., Hamblen, J., Han, B. H., Harris, J. W., Hartig, M., Harutyunyan, A., Hasch, D., Hasegan, D., Hatzifotiadou, D., Hayrapetyan, A., Heide, M., Heinz, M., Helstrup, H., Herghelegiu, A., Hernández, C., Herrera Corral, G., Herrmann, N., Hetland, K. F., Hicks, B., Hiei, A., Hille, P. T., Hippolyte, B., Horaguchi, T., Hori, Y., Hristov, P., Hřivnáčová, I., Hu, S., Huber, S., Humanic, T. J., Hutter, D., Hwang, D. S., Ichou, R., Ilkaev, R., Ilkiv, I., Innocenti, P. 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A., Listratenko, O., Liu, L., Loginov, V., Lohn, S., Lopez, X., López Noriega, M., López-Ramírez, R., López Torres, E., Løvhøiden, G., Lozea Feijo Soares, A., Lu, S., Lunardon, M., Luparello, G., Luquin, L., Lutz, J.-R., Luvisetto, M., Ma, K., Ma, R., Madagodahettige-Don, D. M., Maevskaya, A., Mager, M., Mahajan, A., Mahapatra, D. P., Maire, A., Makhlyueva, I., Mal’Kevich, D., Malaev, M., Maldonado Cervantes, I., Malek, M., Malkiewicz, T., Malzacher, P., Mamonov, A., Manceau, L., Mangotra, L., Manko, V., Manso, F., Manzari, V., Mao, Y., Mareš, J., Margagliotti, G. V., Margotti, A., Marín, A., Martashvili, I., Martinengo, P., Martínez, M. I., Martínez Davalos, A., Martínez García, G., Maruyama, Y., Marzari Chiesa, A., Masciocchi, S., Masera, M., Masetti, M., Masoni, A., Massacrier, L., Mastromarco, M., Mastroserio, A., Matthews, Z. L., Mattos Tavares, B., Matyja, A., Mayani, D., Mazza, G., Mazzoni, M. A., Meddi, F., Menchaca-Rocha, A., Mendez Lorenzo, P., Meoni, M., Mercado Pérez, J., Mereu, P., Miake, Y., Michalon, A., Miftakhov, N., Milosevic, J., Minafra, F., Mischke, A., Miśkowiec, D., Mitu, C., Mizoguchi, K., Mlynarz, J., Mohanty, B., Molnar, L., Mondal, M. M., Montaño Zetina, L., Monteno, M., Montes, E., Morando, M., Moretto, S., Morsch, A., Moukhanova, T., Muccifora, V., Mudnic, E., Muhuri, S., Müller, H., Munhoz, M. G., Munoz, J., Musa, L., Musso, A., Nandi, B. K., Nania, R., Nappi, E., Navach, F., Navin, S., Nayak, T. K., Nazarenko, S., Nazarov, G., Nedosekin, A., Nendaz, F., Newby, J., Nianine, A., Nicassio, M., Nielsen, B. S., Nikolaev, S., Nikolic, V., Nikulin, S., Nikulin, V., Nilsen, B. S., Nilsson, M. S., Noferini, F., Nomokonov, P., Nooren, G., Novitzky, N., Nyatha, A., Nygaard, C., Nyiri, A., Nystrand, J., Ochirov, A., Odyniec, G., Oeschler, H., Oinonen, M., Okada, K., Okada, Y., Oldenburg, M., Oleniacz, J., Oppedisano, C., Orsini, F., Ortíz Velázquez, A., Ortona, G., Oskamp, C., Oskarsson, A., Osmic, F., Österman, L., Ostrowski, P., Otterlund, I., Otwinowski, J., Øvrebekk, G., Oyama, K., Ozawa, K., Pachmayer, Y., Pachr, M., Padilla, F., Pagano, P., Paić, G., Painke, F., Pajares, C., Pal, S., Pal, S. K., Palaha, A., Palmeri, A., Panse, R., Pappalardo, G. S., Park, W. J., Pastirčák, B., Pastore, C., Paticchio, V., Pavlinov, A., Pawlak, T., Peitzmann, T., Pepato, A., Pereira, H., Peressounko, D., Pérez, C., Perini, D., Perrino, D., Peryt, W., Peschek, J., Pesci, A., Peskov, V., Pestov, Y., Peters, A. 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A., Richter, M., Riedler, P., Riegler, W., Riggi, F., Rivetti, A., Rodriguez Cahuantzi, M., Røed, K., Röhrich, D., Román López, S., Romita, R., Ronchetti, F., Rosinský, P., Rosnet, P., Rossegger, S., Rossi, A., Roukoutakis, F., Rousseau, S., Roy, C., Roy, P., Rubio-Montero, A. J., Rui, R., Rusanov, I., Russo, G., Ryabinkin, E., Rybicki, A., Sadovsky, S., Šafařík, K., Sahoo, R., Saini, J., Saiz, P., Sakata, D., Salgado, C. A., Salgueiro Dominques da Silva, R., Salur, S., Samanta, T., Sambyal, S., Samsonov, V., Šándor, L., Sandoval, A., Sano, M., Sano, S., Santo, R., Santoro, R., Sarkamo, J., Saturnini, P., Scapparone, E., Scarlassara, F., Scharenberg, R. P., Schiaua, C., Schicker, R., Schindler, H., Schmidt, C., Schmidt, H. R., Schreiner, S., Schuchmann, S., Schukraft, J., Schutz, Y., Schwarz, K., Schweda, K., Scioli, G., Scomparin, E., Segato, G., Semenov, D., Senyukov, S., Seo, J., Serci, S., Serkin, L., Serradilla, E., Sevcenco, A., Sgura, I., Shabratova, G., Shahoyan, R., Sharkov, G., Sharma, N., Sharma, S., Shigaki, K., Shimomura, M., Shtejer, K., Sibiriak, Y., Siciliano, M., Sicking, E., Siddi, E., Siemiarczuk, T., Silenzi, A., Silvermyr, D., Simili, E., Simonetti, G., Singaraju, R., Singh, R., Singhal, V., Sinha, B. C., Sinha, T., Sitar, B., Sitta, M., Skaali, T. B., Skjerdal, K., Smakal, R., Smirnov, N., Snellings, R., Snow, H., Søgaard, C., Sokolov, O., Soloviev, A., Soltveit, H. K., Soltz, R., Sommer, W., Son, C. W., Son, H. S., Song, M., Soos, C., Soramel, F., Soyk, D., Spyropoulou-Stassinaki, M., Srivastava, B. K., Stachel, J., Staley, F., Stan, I., Stefanek, G., Stefanini, G., Steinbeck, T., Stenlund, E., Steyn, G., Stocco, D., Stock, R., Stolpovsky, P., Strmen, P., Suaide, A. A. P., Subieta Vásquez, M. A., Sugitate, T., Suire, C., Šumbera, M., Susa, T., Swoboda, D., Symons, T. J. M., Szanto de Toledo, A., Szarka, I., Szostak, A., Szuba, M., Tadel, M., Tagridis, C., Takahara, A., Takahashi, J., Tanabe, R., Tapia Takaki, J. D., Taureg, H., Tauro, A., Tavlet, M., Tejeda Muñoz, G., Telesca, A., Terrevoli, C., Thäder, J., Tieulent, R., Tlusty, D., Toia, A., Tolyhy, T., Torcato de Matos, C., Torii, H., Torralba, G., Toscano, L., Tosello, F., Tournaire, A., Traczyk, T., Tribedy, P., Tröger, G., Truesdale, D., Trzaska, W. H., Tsiledakis, G., Tsilis, E., Tsuji, T., Tumkin, A., Turrisi, R., Turvey, A., Tveter, T. S., Tydesjö, H., Tywoniuk, K., Ulery, J., Ullaland, K., Uras, A., Urbán, J., Urciuoli, G. M., Usai, G. L., Vacchi, A., Vala, M., Valencia Palomo, L., Vallero, S., van den Brink, A., van der Kolk, N., Vande Vyvre, P., van Leeuwen, M., Vannucci, L., Vargas, A., Varma, R., Vasiliev, A., Vassiliev, I., Vassiliou, M., Vechernin, V., Venaruzzo, M., Vercellin, E., Vergara, S., Vernet, R., Verweij, M., Vetlitskiy, I., Vickovic, L., Viesti, G., Vikhlyantsev, O., Vilakazi, Z., Villalobos Baillie, O., Vinogradov, A., Vinogradov, L., Vinogradov, Y., Virgili, T., Viyogi, Y. P., Vodopianov, A., Voloshin, K., Voloshin, S., Volpe, G., von Haller, B., Vranic, D., Vrláková, J., Vulpescu, B., Wagner, B., Wagner, V., Wallet, L., Wan, R., Wang, D., Wang, Y., Wang, Y., Watanabe, K., Wen, Q., Wessels, J., Wiechula, J., Wikne, J., Wilk, A., Wilk, G., Williams, M. C. S., Willis, N., Windelband, B., Xu, C., Yang, C., Yang, H., Yasnopolsky, A., Yermia, F., Yi, J., Yin, Z., Yokoyama, H., Yoo, I.-K., Yuan, X., Yushmanov, I., Zabrodin, E., Zagreev, B., Zalite, A., Zampolli, C., Zanevsky, Yu., Zaporozhets, S., Zarochentsev, A., Závada, P., Zbroszczyk, H., Zelnicek, P., Zenin, A., Zepeda, A., Zgura, I., Zhalov, M., Zhang, X., Zhou, D., Zhou, S., Zhou, S., Zhu, J., Zichichi, A., Zinchenko, A., Zinovjev, G., Zinovjev, M., Zoccarato, Y., Zycháček, V., and The ALICE Collaboration

Published
2010
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33. Phenomenology of the deuteron electromagnetic form factors

Author

Abbott, D., Ahmidouch, A., Anklin, H., Arvieux, J., Ball, J., Beedoe, S., Beise, E.J., Bimbot, L., Boeglin, W., Breuer, H., Carlini, R., Chant, N.S., Danagoulian, S., Dow, K., Ducret, J.-E., Dunne, J., Ewell, L., Eyraud, L., Furget, C., Garçcon, M., Gilman, R., Glashausser, C., Gueye, P., Gustafsson, K., Hafidi, K., Honegger, A., Jourdan, J., Kox, S., Kumbartzki, G., Lu, L., Lung, A., Markowitz, P., McIntyre, J., Meekins, D., Merchez, F., Mitchell, J., Mohring, R., Mtingwa, S., Mrktchyan, H., Pitz, D., Qin, L., Ransome, R., Réal, J.-S., Roos, P.G., Rutt, P., Sawafta, R., Stepanyan, S., Tieulent, R., Tomasi-Gustafsson, E., Turchinetz, W., Vansyoc, K., Volmer, J., Voutier, E., Williamson, C., Wood, S.A., Yan, C., Zhao, J., and Zhao, W.

Published
2000
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35. Technical supplement to “Polarization transfer observables in elastic electron-proton scattering at [formula omitted] and [formula omitted]”

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., 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.

Published
2018
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37. Basic instrumentation for Hall A at Jefferson Lab

Author

Alcorn, J., Anderson, B.D., Aniol, K.A., Annand, J.R.M., Auerbach, L., Arrington, J., Averett, T., Baker, F.T., Baylac, M., Beise, E.J., Berthot, J., Bertin, P.Y., Bertozzi, W., Bimbot, L., Black, T., Boeglin, W.U., Boykin, D.V., Brash, E.J., Breton, V., Breuer, H., Brindza, P., Brown, D., Burtin, E., Calarco, J.R., Cardman, L.S., Carr, R., Cates, G.D., Cavata, C., Chai, Z., Chang, C.C., Chant, N.S., Chen, J.-P., Choi, S., Chudakov, E., Churchwell, S., Coman, M., Cisbani, E., Colilli, S., Colombel, N., Crateri, R., Dale, D.S., Degrande, N., de Jager, C.W., De Leo, R., Deur, A., Dezern, G., Diederich, B., Dieterich, S., di Salvo, R., Djawotho, P., Domingo, J., Ducret, J.-E., Dutta, D., Egiyan, K., Epstein, M.B., Escoffier, S., Esp, S., Ewell, L.A., Finn, J.M., Fissum, K.G., Folts, E., Fonvieille, H., Frois, B., Frullani, S., Gao, H., Gao, J., Garibaldi, F., Gasparian, A., Gavalya, A., Gayou, O., Gilad, S., Gilman, R., Giuliani, F., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Gorringe, T., Gricia, M., Griffioen, K., Hamilton, D., Hansen, J.-O., Hersman, F.W., Higinbotham, D.W., Holmes, R., Holmgren, H., Holtrop, M., d'Hose, N., Hovhannisyan, E., Howell, C., Huber, G.M., Hughes, E., Hyde-Wright, C.E., Ibrahim, H., Incerti, S., Iodice, M., Iommi, R., Ireland, D., Jaminion, S., Jardillier, J., Jensen, S., Jiang, X., Jones, C.E., Jones, M.K., Joo, K., Jutier, C., Kahl, W., Kato, S., Katramatou, A.T., Kelly, J.J., Kerhoas, S., Ketikyan, A., Khandaker, M., Khayat, M., Kino, K., Kominis, I., Korsch, W., Kox, S., Kramer, K., Kumar, K.S., Kumbartzki, G., Kuss, M., Lagamba, L., Laveissière, G., Leone, A., LeRose, J.J., Marie, F., Levchuk, L., Leuschner, M., Lhuillier, D., Liang, M., Livingston, K., Lindgren, R.A., Liyanage, N., Lolos, G.J., Lourie, R.W., Lucentini, M., Madey, R., Maeda, K., Malov, S., Manley, D.M., Margaziotis, D.J., Markowitz, P., Marroncle, J., Martine, J., Mayilyan, S., McCarthy, J.S., McCormick, K., Mclntyre, J., McKeown, R.D., Meekins, D., van der Meer, R.L.J., Meziani, Z.-E., Michaels, R., Milbrath, B., Miller, J.A., Miller, W., Mitchell, J., Mougey, J., Nanda, S., Nathan, A., Neyret, D., Offermann, E.A.J.M., Papandreou, Z., Perdrisat, C.F., Perrino, R., Petratos, G.G., Petrosyan, A., Pierangeli, L., Platchkov, S., Pomatsalyuk, R., Pripstein, D., Prout, D.L., Punjabi, V.A., Pussieux, T., Quéméner, G., Ransomez, R.D., Ravel, O., Reitz, B., Roblin, Y., Roche, R., Roedelbronn, M., Rondon-Aramayo, O.A., Roos, P.G., Rosner, G., Rowntree, D., Rutledge, G.A., Rutt, P.M., Rvachev, M., Sabatavenere, F., Saha, A., Saito, T., Santavenere, F., Sarty, A.J., Schneider, W.J., Segal, J.P., Serdarevic-Offermann, A., Shahinyan, A., Slifer, K., Smith, T.P., Soldi, A., Sorokin, P., Souder, P., Spiegel, S.L., Stevens, M.A., Strauch, S., Suleiman, R., Templon, J.A., Terasawa, T., Todor, L., Tsubota, H., Ueno, H., Ulmer, P.E., Urciuoli, G.M., Van Hoorebeke, L., Van de Vyver, R., van Verst, S., Vernin, P., Vlahovic, B., Voskanyan, H., Voutier, E., Walter, R., Watson, J.W., Watts, D.P., Weinstein, L.B., Wijesooriya, K., Wojtsekhowski, B., Xiang, H., Xiong, F., Xu, W., Zainea, D.G., Zeps, V., Zhao, J., Zheng, X., Zhou, Z.-L., Zhu, L., and Zolnierczuk, P.A.

Published
2004
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38. 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

39. Recent results from the G0 experiment

Author

Roos P., Roche J., Ramsay W.D., Quinn B., Poelker M., Pitt M.L., Pillot P., Phillips S.K., Pate S.F., Papavassiliou V., Page S.A., van Oers W.T.H., Muether M., Mkrtchyan H., Mihovilovic M., Micherdzinska A., McKeown R.D., Martin J.W., Mammei J., Lung A., Liu J., Lee L., Kox S., Korsch W., King P.M., Jones M., Horn T., Hansknecht J., Guillard G., Grames J., Gericke M.T.W., Gaskell D., Furget C., Franklin G., Flores G., Davis C.A., Ellis C., Coppens A., Chao Y.-C., Capuano C.L., Breuer H., Bosted P., Birchall J., Benmokhtar F., Bimbot L., Benesch J., Beise E.J., Beck D.H., Bailey S.L., Arvieux J., Armstrong D.S., Androić D., Real J.S., Schaub J., Seva T., Simicevic N., Smith G.R., Spayde D.T., Stutzman M., Suleiman R., Tadevosyan V., Versteegen M., Voutier E., Vulcan W., Wells S.P., Williamson S.E., and Wood S.A.

Subjects
Physics, QC1-999
Abstract

We have measured parity violating asymmetries in elastic electron-proton and quasi-elastic electrondeuteron scattering at backward electron angle. These measurements have been done at two momentum transfers : Q2 = 0.22 and 0.63 (GeV/c)2 . Together with our previous forward angle measurement [1], we can extract strange quark contributions to the electromagnetic form factors of the nucleon, as well as nucleon axial form factor coming from the neutral weak interaction. The results indicate a strange quark magnetic contribution close to zero at these Q2 , and a possible non zero strange quark electric contribution for the high Q2 . The first Q2 behavior measurement of the nucleon axial form factor in elastic electron scattering shows a good agreement with radiative corrections calculated at Q2 = 0 and with a dipole form using the axial mass determined in neutrino scattering.

Published
2010
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41. 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

42. 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

43. 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

44. Tensor polarization in elastic electron-deuteron scattering to the highest possible momentum transfers

Author

Garçon, M., Abbott, D., Ahmidouch, A., Anklin, H., Arvieux, J., Ball, J., Beedoe, S., Beise, E.J., Bimbot, L., Boeglin, W., Breuer, H., Carlini, R., Chant, N.S., Danagoulian, S., Dow, K., Ducret, J.-E., Dunne, J., Ewell, L., Eyraud, L., Furget, C., Gilman, R., Glashausser, C., Gueye, P., Gustafsson, K., Hafidi, K., Honegger, A., Jourdan, J., Kox, S., Kumbartzki, G., Lu, L., Lung, A., Mack, D., Markowitz, P., McIntyre, J., Meekins, D., Merchez, F., Mitchell, J., Mohring, R., Mtingwa, S., Mrktchyan, H., Pitz, D., Qin, L., Ransome, R., Réal, J.-S., Roos, P.G., Rutt, P., Schmidt, W., Sawafta, R., Stepanyan, S., Stephenson, E.J., Tieulent, R., Tomasi-Gustafsson, E., Turchinetz, W., Vansyoc, K., Volmer, J., Voutier, E., Vulcan, W., Williamson, C., Wood, S.A., Yan, C., Zhao, J., and Zhao, W.

Published
1999
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46. A vector and tensor polarimeter for high-energy deuterons

Author

Tomasi-Gustafsson, E., Yonnet, J., Ladygin, V.P., Ball, J., Bimbot, L., Bisson, Y., Boivin, M., Borzunov, Yu., Boyard, J.L., Cheung, N.E., Courtat, Ph., Gacougnolle, R., Skowron, R., Golovanov, L., Hennino, T., Jones, M.K., Kunne, R., Perdrisat, C.F., Piskunov, N.M., Punjabi, V., Sitnik, I.M., Strokovsky, E.A., and Tsvinev, A.P.

Published
1999
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48. Precision Measurement of the p(e,e ' p)pi(0) Reaction at Threshold

Author

Chirapatpimol, K., Shabestari, M. H., Lindgren, R. A., Smith, L. C., Annand, J. R. M., Higinbotham, D. W., Moffit, B., Nelyubin, V., Norum, B. E., Allada, K., Aniol, K., Ardashev, K., Armstrong, D. S., Arndt, R. A., Benmokhtar, F., Bernstein, A. M., Bertozzi, W., Briscoe, W. J., Bimbot, L., Camsonne, A., Chen, J. -P., Choi, S., Chudakov, E., Cisbani, E., Cusanno, F., Dalton, M. M., Dutta, C., Egiyan, K., Fernandez-Ramirez, C., Feuerbach, R., Fissum, K. G., Frullani, S., Garibaldi, F., Gayou, O., Gilman, R., Gilad, S., Goity, J., Gomez, J., Hahn, B., Hamilton, D., Hansen, J. -O., Huang, J., Igarashi, R., Ireland, D., de Jager, C. W., Jin, X., Jiang, X., Jinasundera, T., Kellie, J., and Watts, Daniel

Subjects
FORM-FACTORS, NEUTRAL-PION ELECTROPRODUCTION, PHOTOPRODUCTION, NEAR-THRESHOLD, Nuclear Experiment, PROTON, CHIRAL PERTURBATION-THEORY
Abstract

New results are reported from a measurement of pi(0) electroproduction near threshold using the p(e , e'p)pi(0) reaction. The experiment was designed to determine precisely the energy dependence of s- and p-wave electromagnetic multipoles as a stringent test of the predictions of chiral perturbation theory (ChPT). The data were taken with an electron beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time, complete coverage of the. phi*(pi) and. theta*(pi) angles in the p pi(0) center of mass was obtained for invariant energies above threshold from 0.5 up to 15 MeV. The 4-momentum transfer Q(2) coverage ranges from 0.05 to 0.155 (GeV/c)(2) in fine steps. A simple phenomenological analysis of our data shows strong disagreement with p-wave predictions from ChPT for Q(2) > 0.07 (GeV/c)(2), while the s-wave predictions are in reasonable agreement.

Published
2015

49. Precision Measurement of the p(e,e′p)π0 Reaction at Threshold

Author

Chirapatpimol, K., Shabestari, M.H., Lindgren, R.A., Smith, L.C., Annand, J.R.M., Higinbotham, D.W., Moffit, B., Nelyubin, V., Norum, B.E., Allada, K., Aniol, K., Ardashev, K., Armstrong, D.S., Arndt, R.A., Benmokhtar, F., Bernstein, A.M., Bertozzi, W., Briscoe, W.J., Bimbot, L., Camsonne, A., Chen, J.-P., Choi, S., Chudakov, E., Cisbani, E., Cusanno, F., Dalton, M.M., Dutta, C., Egiyan, K., Fernàndez-Ramìrez, C., Feuerbach, R., Fissum, K.G., Frullani, S., Garibaldi, F., Gayou, O., Gilman, R., Gilad, S., Goity, J., Gomez, J., Hahn, B., Hamilton, D., Hansen, J.-O., Huang, J., Igarashi, R., Ireland, D., De Jager, C.W., Jin, X., Jiang, X., Jinasundera, T., Kellie, J., Keppel, C.E., Kolb, N., LeRose, J., Liyanage, N., Livingston, K., McNulty, D., Mercado, L., Michaels, R., Mihovilovič, M., Qian, S., Qian, X., Mailyan, S., Mamyan, V., Marrone, S., Monaghan, P., Nanda, S., Perdrisat, C.F., Piasetzky, E., Protopopescu, D., Punjabi, V., Qiang, Y., Rachek, I.A., Rakhman, A., Riordan, S., Ron, G., Rosner, G., Saha, A., Sawatzky, B., Shahinyan, A., Širca, S., Sparveris, N., Subedi, R.R., Suleiman, R., Strakovsky, I., Sulkosky, V., Moinelo, J., Voskanyan, H., Wang, K., Wang, Y., Watson, J., Watts, D., Wojtsekhowski, B., Workman, R.L., Yao, H., Zhan, X., Zhang, Y., 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 Hall A Collaboration

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; New results are reported from a measurement of π0 electroproduction near threshold using the p(e,e′p)π0 reaction. The experiment was designed to determine precisely the energy dependence of s- and p-wave electromagnetic multipoles as a stringent test of the predictions of chiral perturbation theory (ChPT). The data were taken with an electron beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time, complete coverage of the ϕ∗π and θ∗π angles in the pπ0 center of mass was obtained for invariant energies above threshold from 0.5 up to 15 MeV. The 4-momentum transfer Q2 coverage ranges from 0.05 to 0.155 (GeV/c)2 in fine steps. A simple phenomenological analysis of our data shows strong disagreement with p-wave predictions from ChPT for Q2>0.07 (GeV/c)2, while the s-wave predictions are in reasonable agreement.

Published
2015

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