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2. Diamond Detectors for the TOTEM Timing Upgrade

Author

TOTEM Collaboration, Antchev, G., Aspell, P., Atanassov, I., Avati, V., Baechler, J., Berardi, V., Berretti, M., Bossini, E., Bottigli, U., Bozzo, M., Broulím, P., Buzzo, A., Cafagna, F. S., Catanesi, M. G., Csanád, M., Csörgő, T., Deile, M., De Leonardis, F., D'Orazio, A., Doubek, M., Eggert, K., Eremin, V., Ferro, F., Fiergolski, A., Garcia, F., Georgiev, V., Giani, S., Grzanka, L., Guaragnella, C., Hammerbauer, J., Heino, J., Karev, A., Kašpar, J., Kopal, J., Kundrát, V., Lami, S., Latino, G., Lauhakangas, R., Linhart, R., Lokajíček, M. V., Losurdo, L., Vetere, M. Lo, Rodríguez, F. Lucas, Lucsányi, D., Macrí, M., Mercadante, A., Minafra, N., Minutoli, S., Naaranoja, T., Nemes, F., Niewiadomski, H., Novák, T., Oliveri, E., Oljemark, F., Oriunno, M., Österberg, K., Palazzi, P., Paločko, L., Passaro, V., Peroutka, Z., Petruzzelli, V., Politi, T., Procházka, J., Prudenzano, F., Quinto, M., Radermacher, E., Radicioni, E., Ravotti, F., Robutti, E., Royon, C., Ruggiero, G., Saarikko, H., Scribano, A., Smajek, J., Snoeys, W., Sziklai, J., Taylor, C., Turini, N., Vacek, V., Welti, J., Wyszkowski, P., and Zielinski, K.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

This paper describes the design and the performance of the timing detector developed by the TOTEM Collaboration for the Roman Pots (RPs) to measure the Time-Of-Flight (TOF) of the protons produced in central diffractive interactions at the LHC. The measurement of the TOF of the protons allows the determination of the longitudinal position of the proton interaction vertex and its association with one of the vertices reconstructed by the CMS detectors. The TOF detector is based on single crystal Chemical Vapor Deposition (scCVD) diamond plates and is designed to measure the protons TOF with about 50 ps time precision. This upgrade to the TOTEM apparatus will be used in the LHC run 2 and will tag the central diffractive events up to an interaction pileup of about 1. A dedicated fast and low noise electronics for the signal amplification has been developed. The digitization of the diamond signal is performed by sampling the waveform. After introducing the physics studies that will most profit from the addition of these new detectors, we discuss in detail the optimization and the performance of the first TOF detector installed in the LHC in November 2015., Comment: 26 pages, 18 figures, 2 tables, submitted for publication to JINST

Published
2017
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3. Measurement of Elastic pp Scattering at $\sqrt{s}$ = 8 TeV in the Coulomb-Nuclear Interference Region - Determination of the $\rho$-Parameter and the Total Cross-Section

Author

TOTEM Collaboration, Antchev, G., Aspell, P., Atanassov, I., Avati, V., Baechler, J., Berardi, V., Berretti, M., Bossini, E., Bottigli, U., Bozzo, M., Broulím, P., Burkhardt, H., Buzzo, A., Cafagna, F. S., Campanella, C. E., Catanesi, M. G., Csanád, M., Csörgő, T., Deile, M., De Leonardis, F., D'Orazio, A., Doubek, M., Eggert, K., Eremin, V., Ferro, F., Fiergolski, A., Garcia, F., Georgiev, V., Giani, S., Grzanka, L., Guaragnella, C., Hammerbauer, J., Heino, J., Karev, A., Kašpar, J., Kopal, J., Kundrát, V., Lami, S., Latino, G., Lauhakangas, R., Linhart, R., Lippmaa, E., Lippmaa, J., Lokajíček, M. V., Losurdo, L., Vetere, M. Lo, Rodríguez, F. Lucas, Macrí, M., Mercadante, A., Minafra, N., Minutoli, S., Naaranoja, T., Nemes, F., Niewiadomski, H., Oliveri, E., Oljemark, F., Orava, R., Oriunno, M., Österberg, K., Palazzi, P., Paločko, L., Passaro, V., Peroutka, Z., Petruzzelli, V., Politi, T., Procházka, J., Prudenzano, F., Quinto, M., Radermacher, E., Radicioni, E., Ravotti, F., Redaelli, S., Robutti, E., Ropelewski, L., Ruggiero, G., Saarikko, H., Salvachua, B., Scribano, A., Smajek, J., Snoeys, W., Sziklai, J., Taylor, C., Turini, N., Vacek, V., Valentino, G., Welti, J., Wenninger, J., Wyszkowski, P., and Zielinski, K.

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

The TOTEM experiment at the CERN LHC has measured elastic proton-proton scattering at the centre-of-mass energy $\sqrt{s}$ = 8 TeV and four-momentum transfers squared, |t|, from 6 x $10^{-4}$ GeV$^2$ to 0.2 GeV$^2$. Near the lower end of the |t|-interval the differential cross-section is sensitive to the interference between the hadronic and the electromagnetic scattering amplitudes. This article presents the elastic cross-section measurement and the constraints it imposes on the functional forms of the modulus and phase of the hadronic elastic amplitude. The data exclude the traditional Simplified West and Yennie interference formula that requires a constant phase and a purely exponential modulus of the hadronic amplitude. For parametrisations of the hadronic modulus with second- or third-order polynomials in the exponent, the data are compatible with hadronic phase functions giving either central or peripheral behaviour in the impact parameter picture of elastic scattering. In both cases, the $\rho$-parameter is found to be 0.12 $\pm$ 0.03. The results for the total hadronic cross-section are $\sigma_{tot}$ = (102.9 $\pm$ 2.3) mb and (103.0 $\pm$ 2.3) mb for central and peripheral phase formulations, respectively. Both are consistent with previous TOTEM measurements., Comment: 22 pages, 19 figures, 5 tables, accepted for publication in EPJ C

Published
2016
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4. Evidence for non-exponential elastic proton-proton differential cross-section at low |t| and sqrt(s) = 8 TeV by TOTEM

Author

TOTEM Collaboration, Antchev, G., Aspell, P., Atanassov, I., Avati, V., Baechler, J., Berardi, V., Berretti, M., Bossini, E., Bottigli, U., Bozzo, M., Buzzo, A., Cafagna, F. S., Campanella, C. E., Catanesi, M. G., Csanád, M., Csörgő, T., Deile, M., De Leonardis, F., D'Orazio, A., Doubek, M., Eggert, K., Eremin, V., Ferro, F., Fiergolski, A., Garcia, F., Georgiev, V., Giani, S., Grzanka, L., Guaragnella, C., Hammerbauer, J., Heino, J., Karev, A., Kašpar, J., Kopal, J., Kundrát, V., Lami, S., Latino, G., Lauhakangas, R., Lippmaa, E., Lippmaa, J., Lokajíček, M. V., Losurdo, L., Vetere, M. Lo, Rodríguez, F. Lucas, Macrí, M., Mercadante, A., Minafra, N., Minutoli, S., Naaranoja, T., Nemes, F., Niewiadomski, H., Oliveri, E., Oljemark, F., Orava, R., Oriunno, M., Österberg, K., Palazzi, P., Passaro, V., Peroutka, Z., Petruzzelli, V., Politi, T., Procházka, J., Prudenzano, F., Quinto, M., Radermacher, E., Radicioni, E., Ravotti, F., Robutti, E., Ropelewski, L., Ruggiero, G., Saarikko, H., Scribano, A., Smajek, J., Snoeys, W., Sodzawiczny, T., Sziklai, J., Taylor, C., Turini, N., Vacek, V., Welti, J., Wyszkowski, P., and Zielinski, K.

Subjects
High Energy Physics - Experiment
Abstract

The TOTEM experiment has made a precise measurement of the elastic proton-proton differential cross-section at the centre-of-mass energy sqrt(s) = 8 TeV based on a high-statistics data sample obtained with the beta* = 90 optics. Both the statistical and systematic uncertainties remain below 1%, except for the t-independent contribution from the overall normalisation. This unprecedented precision allows to exclude a purely exponential differential cross-section in the range of four-momentum transfer squared 0.027 < |t| < 0.2 GeV^2 with a significance greater than 7 sigma. Two extended parametrisations, with quadratic and cubic polynomials in the exponent, are shown to be well compatible with the data. Using them for the differential cross-section extrapolation to t = 0, and further applying the optical theorem, yields total cross-section estimates of (101.5 +- 2.1) mb and (101.9 +- 2.1) mb, respectively, in agreement with previous TOTEM measurements., Comment: Final version published in Nuclear Physics B

Published
2015
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5. Comparative Analysis of PRID Algorithms Based on Results Ambiguity Evaluation

Author

Renò, V., Cardellicchio, A., Politi, T., Guaragnella, C., D’Orazio, T., Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Fred, Ana, editor, De Marsico, Maria, editor, and Sanniti di Baja, Gabriella, editor

Published
2017
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6. On the Solution of Skew-Symmetric Shifted Linear Systems

Author

Politi, T., Pugliese, A., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Alexandrov, Vassil N., editor, van Albada, Geert Dick, editor, Sloot, Peter M. A., editor, and Dongarra, Jack, editor

Published
2006
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7. Schur Decomposition Methods for the Computation of Rational Matrix Functions

Author

Politi, T., Popolizio, M., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Alexandrov, Vassil N., editor, van Albada, Geert Dick, editor, Sloot, Peter M. A., editor, and Dongarra, Jack, editor

Published
2006
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8. A Continuous Approach for the Computation of the Hyperbolic Singular Value Decomposition

Author

Politi, T., Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Bubak, Marian, editor, van Albada, Geert Dick, editor, Sloot, Peter M. A., editor, and Dongarra, Jack, editor

Published
2004
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22. Measurement of elastic pp scattering at s=8  TeV in the Coulomb–nuclear interference region: determination of the ρ -parameter and the total cross-section

Author

Antchev, G., Aspell, P., Atanassov, I., Avati, V., Baechler, J., Berardi, V., Berretti, M., Bossini, E., Bottigli, U., Bozzo, M., Broulím, P., Burkhardt, H., Buzzo, A., Cafagna, F.S., Campanella, C.E., Catanesi, M.G., Csanád, M., Csörgő, T., Deile, M., De Leonardis, F., D’Orazio, A., Doubek, M., Eggert, K., Eremin, V., Ferro, F., Fiergolski, A., Garcia, F., Georgiev, V., Giani, S., Grzanka, L., Guaragnella, C., Hammerbauer, J., Heino, J., Karev, A., Kašpar, J., Kopal, J., Kundrát, V., Lami, S., Latino, G., Lauhakangas, R., Linhart, R., Lippmaa, E., Lippmaa, J., Lokajíček, M.V., Losurdo, L., Lo Vetere, M., Lucas Rodríguez, F., Macrí, M., Mercadante, A., Minafra, N., Minutoli, S., Naaranoja, T., Nemes, F., Niewiadomski, H., Oliveri, E., Oljemark, F., Orava, R., Oriunno, M., Österberg, K., Palazzi, P., Paločko, L., Passaro, V., Peroutka, Z., Petruzzelli, V., Politi, T., Procházka, J., Prudenzano, F., Quinto, M., Radermacher, E., Radicioni, E., Ravotti, F., Redaelli, S., Robutti, E., Ropelewski, L., Ruggiero, G., Saarikko, H., Salvachua, B., Scribano, A., Smajek, J., Snoeys, W., Sziklai, J., Taylor, C., Turini, N., Vacek, V., Valentino, G., Welti, J., Wenninger, J., Wyszkowski, P., and Zielinski, K.

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

The TOTEM experiment at the CERN LHC has measured elastic proton–proton scattering at the centre-of-mass energy s=8 TeV and four-momentum transfers squared, | t |, from 6×10-4 to 0.2 GeV 2 . Near the lower end of the t -interval the differential cross-section is sensitive to the interference between the hadronic and the electromagnetic scattering amplitudes. This article presents the elastic cross-section measurement and the constraints it imposes on the functional forms of the modulus and phase of the hadronic elastic amplitude. The data exclude the traditional Simplified West and Yennie interference formula that requires a constant phase and a purely exponential modulus of the hadronic amplitude. For parametrisations of the hadronic modulus with second- or third-order polynomials in the exponent, the data are compatible with hadronic phase functions giving either central or peripheral behaviour in the impact parameter picture of elastic scattering. In both cases, the ρ -parameter is found to be 0.12±0.03 . The results for the total hadronic cross-section are σtot=(102.9±2.3)  mb and (103.0±2.3)  mb for central and peripheral phase formulations, respectively. Both are consistent with previous TOTEM measurements.

Published
2016

23. Measurement of elastic pp scattering at s√=8 TeV in the Coulomb–nuclear interference region: determination of the ρ-parameter and the total cross-section

Author

Antchev, G., Aspell, P., Atanassov, I., Avati, V., Baechler, J., Berardi, V., Berretti, M., Bossini, E., Bottigli, U., Bozzo, M., Broulím, P., Burkhardt, H., Buzzo, A., Cafagna, F. S., Campanella, C. E., Catanesi, M. G., Csanád, M., Csörgő, T., Deile, M., De&nbsp, Leonardis, F., D’Orazio, A., Doubek, M., Eggert, K., Eremin, V., Ferro, F., Fiergolski, A., Garcia, F., Georgiev, V., Giani, S., Grzanka, L., Guaragnella, C., Hammerbauer, J., Heino, J., Karev, A., Kašpar, J., Kopal, J., Kundrát, V., Lami, S., Latino, G., Lauhakangas, R., Linhart, R., Lippmaa, E., Lippmaa, J., Lokajíček, M. V., Losurdo, L., Lo&nbsp, Vetere, M., Lucas&nbsp, Rodríguez, F., Macrí, M., Mercadante, A., Minafra, N., Minutoli, S., Naaranoja, T., Nemes, F., Niewiadomski, H., Oliveri, E., Oljemark, F., Orava, R., Oriunno, M., Österberg, K., Palazzi, P., Paločko, L., Passaro, V., Peroutka, Z., Petruzzelli, V., Politi, T., Procházka, J., Prudenzano, F., Quinto, M., Radermacher, E., Radicioni, E., Ravotti, F., Redaelli, S., Robutti, E., Ropelewski, L., Ruggiero, G., Saarikko, H., Salvachua, B., Scribano, A., Smajek, J., Snoeys, W., Sziklai, J., Taylor, C., Turini, N., Vacek, V., Valentino, G., Welti, J., Wenninger, J., Wyszkowski, P., and Zielinski, K.

Published
2016

24. Diamond detectors for the TOTEM timing upgrade

Author

Antchev, G., primary, Aspell, P., additional, Atanassov, I., additional, Avati, V., additional, Baechler, J., additional, Berardi, V., additional, Berretti, M., additional, Bossini, E., additional, Bottigli, U., additional, Bozzo, M., additional, Broulím, P., additional, Buzzo, A., additional, Cafagna, F.S., additional, Catanesi, M.G., additional, Csanád, M., additional, Csörgő, T., additional, Deile, M., additional, Leonardis, F. De, additional, D'Orazio, A., additional, Doubek, M., additional, Eggert, K., additional, Eremin, V., additional, Ferro, F., additional, Fiergolski, A., additional, Garcia, F., additional, Georgiev, V., additional, Giani, S., additional, Grzanka, L., additional, Guaragnella, C., additional, Hammerbauer, J., additional, Heino, J., additional, Karev, A., additional, Kašpar, J., additional, Kopal, J., additional, Kundrát, V., additional, Lami, S., additional, Latino, G., additional, Lauhakangas, R., additional, Linhart, R., additional, Lokajíček, M.V., additional, Losurdo, L., additional, Vetere, M. Lo, additional, Rodríguez, F. Lucas, additional, Lucsanyi, D., additional, Macrí, M., additional, Mercadante, A., additional, Minafra, N., additional, Minutoli, S., additional, Naaranoja, T., additional, Nemes, F., additional, Niewiadomski, H., additional, Novak, T., additional, Oliveri, E., additional, Oljemark, F., additional, Oriunno, M., additional, Österberg, K., additional, Palazzi, P., additional, Paločko, L., additional, Passaro, V., additional, Peroutka, Z., additional, Petruzzelli, V., additional, Politi, T., additional, Procházka, J., additional, Prudenzano, F., additional, Quinto, M., additional, Radermacher, E., additional, Radicioni, E., additional, Ravotti, F., additional, Robutti, E., additional, Royon, C., additional, Ruggiero, G., additional, Saarikko, H., additional, Scribano, A., additional, Smajek, J., additional, Snoeys, W., additional, Sziklai, J., additional, Taylor, C., additional, Turini, N., additional, Vacek, V., additional, Welti, J., additional, Wyszkowski, P., additional, and Zielinski, K., additional

Published
2017
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25. Evidence for Non-Exponential Elastic Proton-Proton Differential Cross-Section at Low |t| and $\sqrt{s}$ = 8 TeV by TOTEM

Author

TOTEM Collaboration, Antchev, G., Aspell, P., Atanassov, I., Avati, V., Baechler, J., Berardi, V., Berretti, M., Bossini, E., Bottigli, U., Bozzo, M., Buzzo, A., Cafagna, F. S., Campanella, C. E., Catanesi, M. G., Csan��d, M., Cs��rg��, T., Deile, M., De Leonardis, F., D'Orazio, A., Doubek, M., Eggert, K., Eremin, V., Ferro, F., Fiergolski, A., Garcia, F., Georgiev, V., Giani, S., Grzanka, L., Guaragnella, C., Hammerbauer, J., Heino, J., Karev, A., Ka��par, J., Kopal, J., Kundr��t, V., Lami, S., Latino, G., Lauhakangas, R., Lippmaa, E., Lippmaa, J., Lokaj����ek, M. V., Losurdo, L., Vetere, M. Lo, Rodr��guez, F. Lucas, Macr��, M., Mercadante, A., Minafra, N., Minutoli, S., Naaranoja, T., Nemes, F., Niewiadomski, H., Oliveri, E., Oljemark, F., Orava, R., Oriunno, M., ��sterberg, K., Palazzi, P., Passaro, V., Peroutka, Z., Petruzzelli, V., Politi, T., Proch��zka, J., Prudenzano, F., Quinto, M., Radermacher, E., Radicioni, E., Ravotti, F., Robutti, E., Ropelewski, L., Ruggiero, G., Saarikko, H., Scribano, A., Smajek, J., Snoeys, W., Sodzawiczny, T., Sziklai, J., Taylor, C., Turini, N., Vacek, V., Welti, J., Wyszkowski, P., and Zielinski, K.

Subjects
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, Particle Physics - Experiment, High Energy Physics - Experiment
Abstract

The TOTEM experiment has made a precise measurement of the elastic proton-proton differential cross-section at the centre-of-mass energy sqrt(s) = 8 TeV based on a high-statistics data sample obtained with the beta* = 90 optics. Both the statistical and systematic uncertainties remain below 1%, except for the t-independent contribution from the overall normalisation. This unprecedented precision allows to exclude a purely exponential differential cross-section in the range of four-momentum transfer squared 0.027 < |t| < 0.2 GeV^2 with a significance greater than 7 sigma. Two extended parametrisations, with quadratic and cubic polynomials in the exponent, are shown to be well compatible with the data. Using them for the differential cross-section extrapolation to t = 0, and further applying the optical theorem, yields total cross-section estimates of (101.5 +- 2.1) mb and (101.9 +- 2.1) mb, respectively, in agreement with previous TOTEM measurements., Final version published in Nuclear Physics B

Published
2015

26. Measurement of elastic pp scattering at √ s = 8 TeV in the coulomb- nuclear interference region – determination of the ρ-parameter and the total cross-section

Author

Antchev, G., Aspell, P., Atanassov, I., Avati, V., Baechler, J., Berardi, V., Berretti, M., Bossini, E., Bottigli, U., Bozzo, M., Broulim, P., Burkhardt, Helmut, Buzzo, A., Cafagna, F. S., Campanella, C. E., Catanesi, M. G., Csanad, M., Csorgo, T., Deile, Mario, Leonardis de, F., D’Orazio, A., Doubek, M., Eggert, K., Eremin, V., Ferro, F., Fiergolski, A., Garcia, F., Georgiev, V., Giani, S., Grzanka, I., Guaragnella, C., Hammerbauer, J., Heino, Jouni, Karev, A., Kaspar, J., Kopal, J., Kundrat, V., Lami, S., Latino, G., Lauhakangas, R., Linhart, R., Lippmaa, E., Lippmaa, J., Lokajicek, M. V., Losurdo, L., Vetere lo, M., Lucas Rodriguez, F., Marci, M., Mercadante, A., Minafra, N., Minutoli, S., Naaranoja, T., Nemes, F., Niewiadomski, H., Oliveri, E., Oljemark, F., Orava, F., Oriunno, Marco, Osterberg, K., Palazzi, P., Palocko, L., Passaro, V., Peroutka, Z., Petruzzelli, V., Politi, T., Prochazka, J., Prudenzano, F., Quinto, M., Radermacher, E., Radicioni, E., Ravotti, F., Redaelli, Stefano, Robutti, E., Ropelewski, L., Ruggiero, G., Saarikko, H., Salvachua, Belen, Scribano, A., Smajek, J., Snoeys, W., Sziklai, J., Taylor, C., Turini, N., Vacek, V., Valentino, Gianluca, Welti, J., Wenninger, Jorg, Wyszkowski, P., Zielinski, K., TOTEM Collaboration, and TOTEM Collaboration

Subjects
Proton beams -- Measurement, Multiple scattering (Physics), High Energy Physics::Experiment, Nuclear Experiment, Large Hadron Collider (France and Switzerland)
Abstract

The TOTEM experiment at the CERN LHC has measured elastic proton-proton scattering at the centre-of-mass energy √s = 8TeV and four-momentum transfers squared, |t|, from 6 × 10−4 GeV2 to 0.2 GeV2 . Near the lower end of the t-interval the differential cross-section is sensitive to the interference between the hadronic and the electromagnetic scattering amplitudes. This article presents the elastic cross-section measurement and the constraints it imposes on the functional forms of the modulus and phase of the hadronic elastic amplitude. The data exclude the traditional Simplified West and Yennie interference formula that requires a constant phase and a purely exponential modulus of the hadronic amplitude. For parametrisations of the hadronic modulus with second- or third-order polynomials in the exponent, the data are compatible with hadronic phase functions giving either central or peripheral behaviour in the impact parameter picture of elastic scattering. In both cases, the ρ-parameter is found to be 0.12 ± 0.03. The results for the total hadronic cross-section are σtot = (102.9±2.3) mb and (103.0 ± 2.3) mb for central and peripheral phase formulations, respectively. Both are consistent with previous TOTEM measurements., non peer-reviewed

Published
2015

28. Measurement of elastic pp scattering at $$\sqrt{\hbox {s}} = \hbox {8}$$ s = 8 TeV in the Coulomb–nuclear interference region: determination of the $$\mathbf {\rho }$$ ρ -parameter and the total cross-section

Author

Antchev, G., primary, Aspell, P., additional, Atanassov, I., additional, Avati, V., additional, Baechler, J., additional, Berardi, V., additional, Berretti, M., additional, Bossini, E., additional, Bottigli, U., additional, Bozzo, M., additional, Broulím, P., additional, Burkhardt, H., additional, Buzzo, A., additional, Cafagna, F. S., additional, Campanella, C. E., additional, Catanesi, M. G., additional, Csanád, M., additional, Csörgő, T., additional, Deile, M., additional, De Leonardis, F., additional, D’Orazio, A., additional, Doubek, M., additional, Eggert, K., additional, Eremin, V., additional, Ferro, F., additional, Fiergolski, A., additional, Garcia, F., additional, Georgiev, V., additional, Giani, S., additional, Grzanka, L., additional, Guaragnella, C., additional, Hammerbauer, J., additional, Heino, J., additional, Karev, A., additional, Kašpar, J., additional, Kopal, J., additional, Kundrát, V., additional, Lami, S., additional, Latino, G., additional, Lauhakangas, R., additional, Linhart, R., additional, Lippmaa, E., additional, Lippmaa, J., additional, Lokajíček, M. V., additional, Losurdo, L., additional, Lo Vetere, M., additional, Lucas Rodríguez, F., additional, Macrí, M., additional, Mercadante, A., additional, Minafra, N., additional, Minutoli, S., additional, Naaranoja, T., additional, Nemes, F., additional, Niewiadomski, H., additional, Oliveri, E., additional, Oljemark, F., additional, Orava, R., additional, Oriunno, M., additional, Österberg, K., additional, Palazzi, P., additional, Paločko, L., additional, Passaro, V., additional, Peroutka, Z., additional, Petruzzelli, V., additional, Politi, T., additional, Procházka, J., additional, Prudenzano, F., additional, Quinto, M., additional, Radermacher, E., additional, Radicioni, E., additional, Ravotti, F., additional, Redaelli, S., additional, Robutti, E., additional, Ropelewski, L., additional, Ruggiero, G., additional, Saarikko, H., additional, Salvachua, B., additional, Scribano, A., additional, Smajek, J., additional, Snoeys, W., additional, Sziklai, J., additional, Taylor, C., additional, Turini, N., additional, Vacek, V., additional, Valentino, G., additional, Welti, J., additional, Wenninger, J., additional, Wyszkowski, P., additional, and Zielinski, K., additional

Published
2016
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30. Evidence for non-exponential elastic proton proton differential cross-section at low vertical bar t vertical bar and root s=8 TeV by TOTEM

Author

University of Helsinki, Helsinki Institute of Physics, University of Helsinki, Department of Physics, Antchev, G., Aspell, P., Atanassov, I., Avati, V., Baechler, J., Berardi, V., Berretti, M., Bossini, E., Bottigli, U., Bozzo, M., Broulim, P., Buzzo, A., Cafagna, F. S., Campanella, C. E., Catanesi, M. G., Csanad, M., Csoergo, T., Deile, M., De Leonardis, F., D'Orazio, A., Doubek, M., Eggert, K., Eremin, V., Ferro, F., Fiergolski, A., Garcia, F., Georgiev, V., Giani, S., Grzanka, L., Guaragnella, C., Hammerbauer, J., Heino, J., Karev, A., Kaspar, J., Kopal, J., Kundrat, V., Lami, S., Latino, G., Lauhakangas, R., Linhart, R., Lippmaa, E., Lippmaa, J., Lokajicek, M. V., Losurdo, L., Lo Vetere, M., Lucas Rodriguez, F., Macri, M., Mercadante, A., Minafra, N., Minutoli, S., Naaranoja, T., Nemes, F., Niewiadomski, H., Oliveri, E., Oljemark, F., Orava, R., Oriunno, M., Österberg, K., Palazzi, P., Palocko, L., Passaro, V., Peroutka, Z., Petruzzelli, V., Politi, T., Prochazka, J., Prudenzano, F., Quinto, M., Radermacher, E., Radicioni, E., Ravotti, F., Robutti, E., Ropelewski, L., Ruggiero, G., Saarikko, H., Scribano, A., Smajek, J., Snoeys, W., Sodzawiczny, T., Sziklai, J., Taylor, C., Turini, N., Vacek, V., Welti, J., Wyszkowski, P., Zielinski, K., University of Helsinki, Helsinki Institute of Physics, University of Helsinki, Department of Physics, Antchev, G., Aspell, P., Atanassov, I., Avati, V., Baechler, J., Berardi, V., Berretti, M., Bossini, E., Bottigli, U., Bozzo, M., Broulim, P., Buzzo, A., Cafagna, F. S., Campanella, C. E., Catanesi, M. G., Csanad, M., Csoergo, T., Deile, M., De Leonardis, F., D'Orazio, A., Doubek, M., Eggert, K., Eremin, V., Ferro, F., Fiergolski, A., Garcia, F., Georgiev, V., Giani, S., Grzanka, L., Guaragnella, C., Hammerbauer, J., Heino, J., Karev, A., Kaspar, J., Kopal, J., Kundrat, V., Lami, S., Latino, G., Lauhakangas, R., Linhart, R., Lippmaa, E., Lippmaa, J., Lokajicek, M. V., Losurdo, L., Lo Vetere, M., Lucas Rodriguez, F., Macri, M., Mercadante, A., Minafra, N., Minutoli, S., Naaranoja, T., Nemes, F., Niewiadomski, H., Oliveri, E., Oljemark, F., Orava, R., Oriunno, M., Österberg, K., Palazzi, P., Palocko, L., Passaro, V., Peroutka, Z., Petruzzelli, V., Politi, T., Prochazka, J., Prudenzano, F., Quinto, M., Radermacher, E., Radicioni, E., Ravotti, F., Robutti, E., Ropelewski, L., Ruggiero, G., Saarikko, H., Scribano, A., Smajek, J., Snoeys, W., Sodzawiczny, T., Sziklai, J., Taylor, C., Turini, N., Vacek, V., Welti, J., Wyszkowski, P., and Zielinski, K.

Abstract

The TOTEM experiment has made a precise measurement of the elastic proton proton differential cross-section at the centre-of-mass energy root s = 8 TeV based on a high-statistics data sample obtained with the beta* = 90 m optics. Both the statistical and systematic uncertainties remain below 1%, except for the t-independent contribution from the overall normalisation. This unprecedented precision allows to exclude a purely exponential differential cross-section in the range of four-momentum transfer squared 0.027

Published
2015

31. Evidence for non-exponential elastic proton–proton differential cross-section at low |t| and s=8TeV by TOTEM

Author

Antchev, G., primary, Aspell, P., additional, Atanassov, I., additional, Avati, V., additional, Baechler, J., additional, Berardi, V., additional, Berretti, M., additional, Bossini, E., additional, Bottigli, U., additional, Bozzo, M., additional, Broulím, P., additional, Buzzo, A., additional, Cafagna, F.S., additional, Campanella, C.E., additional, Catanesi, M.G., additional, Csanád, M., additional, Csörgő, T., additional, Deile, M., additional, De Leonardis, F., additional, D'Orazio, A., additional, Doubek, M., additional, Eggert, K., additional, Eremin, V., additional, Ferro, F., additional, Fiergolski, A., additional, Garcia, F., additional, Georgiev, V., additional, Giani, S., additional, Grzanka, L., additional, Guaragnella, C., additional, Hammerbauer, J., additional, Heino, J., additional, Karev, A., additional, Kašpar, J., additional, Kopal, J., additional, Kundrát, V., additional, Lami, S., additional, Latino, G., additional, Lauhakangas, R., additional, Linhart, R., additional, Lippmaa, E., additional, Lippmaa, J., additional, Lokajíček, M.V., additional, Losurdo, L., additional, Lo Vetere, M., additional, Lucas Rodríguez, F., additional, Macrí, M., additional, Mercadante, A., additional, Minafra, N., additional, Minutoli, S., additional, Naaranoja, T., additional, Nemes, F., additional, Niewiadomski, H., additional, Oliveri, E., additional, Oljemark, F., additional, Orava, R., additional, Oriunno, M., additional, Österberg, K., additional, Palazzi, P., additional, Paločko, L., additional, Passaro, V., additional, Peroutka, Z., additional, Petruzzelli, V., additional, Politi, T., additional, Procházka, J., additional, Prudenzano, F., additional, Quinto, M., additional, Radermacher, E., additional, Radicioni, E., additional, Ravotti, F., additional, Robutti, E., additional, Ropelewski, L., additional, Ruggiero, G., additional, Saarikko, H., additional, Scribano, A., additional, Smajek, J., additional, Snoeys, W., additional, Sodzawiczny, T., additional, Sziklai, J., additional, Taylor, C., additional, Turini, N., additional, Vacek, V., additional, Welti, J., additional, Wyszkowski, P., additional, and Zielinski, K., additional

Published
2015
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42. On the Solution of Skew-Symmetric Shifted Linear Systems.

Author

Alexandrov, Vassil N., Albada, Geert Dick, Sloot, Peter M. A., Dongarra, Jack, Politi, T., and Pugliese, A.

Abstract

In this paper we consider the problem of solving a sequence of linear systems with coefficient matrix Aα=I + αA (or Aα=αI + A), where α is a real paramater and A is skew-symmetric matrix. We propose to solve this problem exploiting the structure of the Schur decomposition of the skew-symmetric matrix and computing the Singular Value Decomposition of a bidiagonal matrix of halved size. [ABSTRACT FROM AUTHOR]

Published
2006
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43. Schur Decomposition Methods for the Computation of Rational Matrix Functions.

Author

Alexandrov, Vassil N., Albada, Geert Dick, Sloot, Peter M. A., Dongarra, Jack, Politi, T., and Popolizio, M.

Abstract

In this work we consider the problem to compute the vector $\vec{y}=\Phi_{m,n}(A)\vec{x}$ where Φm,n(z) is a rational function, $\vec{x}$ is a vector and A is a matrix of order N, usually nonsymmetric. The problem arises when we need to compute the matrix function f(A), being f(z) a complex analytic function and Φm,n(z) a rational approximation of f. Hence Φm,n(A) is a approximation for f(A) cheaper to compute. We consider the problem to compute first the Schur decomposition of A then the matrix rational function exploting the partial fractions expansion. In this case it is necessary to solve a sequence of linear systems with the shifted coefficient matrix $(A-z_jI)\vec{y}=\vec{b}$. [ABSTRACT FROM AUTHOR]

Published
2006
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