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12 results on '"Takeutchi F"'

1. Search for Long-Lived States of $\pi^+\pi^-$ Atoms : Addendum to the DIRAC Proposal

Author

Adeva, B, Afanasyev, L, Anania, A, Aogaki, S, Augsten, K, Batyuk, P, Benelli, A, Brekhovskikh, V, Cechak, T, Chiba, M, Ciortea, C, Curceanu, C, Doskarova, P, Dudarev, A, Dumitriu, D, Drijard, D, Fluerasu, D, Gortchakov, O, Gritsay, K, Guaraldo, C, Gugiu, M, Hansroul, M, Hosek, R, Hons, Z, Iwashita, Y, Karpukhin, V, Kluson, J, Kobayashi, M, Kruglov, V, Kruglova, L, Kulikov, A, Kulish, E, Kuptsov, A, Lamberto, A, Lednicky, R, Martincik, J, Nemenov, L, Nikitin, M, Okada, K, Pentia, M, Plo, M, Prusa, P, Rappazzo, G, Ryazantsev, A, Romero, A, Ronzhin, V, Rykalin, V, Saborido, J, Schacher, J, Shlyapnikov, P, Smolik, J, Takeutchi, F, Trojek, T, Urban, T, Vrba, T, Vazquez, P, Yazkov, V, Yoshimura, Y, Zhabitsky, M, and Zrelov, P

Subjects
Detectors and Experimental Techniques
Abstract

The proposed experiment is a further development of the DIRAC experiment already running at CERN PS. The observation of long-lived (metastable) states of $\pi^+\pi^-$ atoms ($A_{2\pi}$) will be performed with the same setup. This observation opens a possibility to measure the energy difference between $ns$ and $np$ states and to determine the value of the combination $2a_0+a_2$ of S-wave $\pi\pi$ scattering lengths in a model-independent way. In combination with the $A_{2\pi}$ lifetime measurement providing the value $|a_0-a_2|$ DIRAC is in the position to get $a_0$ and $a_2$ separately on the basis of $A_{2\pi}$ data only.

Published
2012

2. Search for Long-Lived States of $\pi^+\pi^-$ Atoms: Addendum to the DIRAC Proposal

Author

Adeva, B, Afanasyev, L, Amsler, C, Anania, A, Aogaki, S, Augsten, K, Benelli, A, Brekhovskikh, V, Cechak, T, Chiba, M, Ciortea, C, Ciocarlan, C, Constantinescu, S, Curceanu, C, Doskarova, P, Dudarev, A, Dumitriu, D, Drijard, D, Enulescu, A, Fluerasu, D, Gortchakov, O, Gritsay, K, Guaraldo, C, Gugiu, M, Hansroul, M, Hosek, R, Hons, Z, Karpukhin, V, Kluson, J, Kobayashi, M, Kulikov, A, Kulish, E, Kuptsov, A, Kruglov, V, Kruglova, L, Kuroda, K, Lamberto, A, Lednicky, R, Martincik, J, Nemenov, L, Nikitin, M, Okada, K, Pentia, M, Plo, M, Prusa, P, Rappazzo, G, Ryazantsev, A, Romero, A, Ronzhin, V, Rykalin, V, Saborido, J, Schacher, J, Shlyapnikov, P, Smolik, J, Takeutchi, F, Tarasov, A, Trojek, T, Urban, T, Vrba, T, Vazquez, P, Yazkov, V, Yoshimura, Y, Zhabitsky, M, and Zrelov, P

Subjects
Detectors and Experimental Techniques
Abstract

The proposed experiment is a further development of the DIRAC experiment already running at CERN PS. Up to now more than 21000 $\pi^+\pi^-$ pairs originated from the $\pi^+\pi^-$ atom ($A_{2\pi}$) breakup were identified and the overall accuracy of the $A_{2\pi}$ lifetime is about 9% in accordance with the DIRAC proposal. This measurement allowed to extract the difference $|a_0-a_2|$ of $s$-wave $\pi\pi$-scattering length with accuracy of 4.3%. The observation of long-lived (metastable) $A_{2\pi}$ states will be performed with the same setup. This observation opens a possibility to measure the energy difference between $ns$ and $np$ states and to determine the value of another combination $2a_0+a_2$ of $\pi\pi$ scattering length in a model-independent way. In combination with the first measurement it allows to get $a_0$ and $a_2$ separately. An additional measurement of the multiple scattering angles in different materials with accuracy better than 1% will be performed in parallel with the observation. This measurement is needed to improve the systematic accuracy in the $A_{2\pi}$ lifetime for the data already collected in 2008--2010.

Published
2011

3. Lifetime measurement of $\pi^{+}\pi^{-}$ and $\pi^{\pm} K^{\mp}$ atoms to test low energy QCD: Addendum to the DIRAC Proposal

Author

Adeva, B, Afanasiev, L G, Berka, Z, Brekhovskikh, V, Caragheorgheopol, G, Cechák, T, Chiba, M, Constantinescu, S, Drijard, Daniel, Dudarev, A, Détraz, C, Evangelou, I, Gallas, M V, Gerndt, J, Giacomich, R, Gianotti, P, Giardoni, M, Gorin, A, Gortchakov, O E, Guaraldo, C, Gómez, F, Hansroul, M, Hosek, R, Iliescu, M A, Jabitski, M, Karpukhin, V V, Kluson, J, Kobayashi, M, Kokkas, P, Komarov, V, Kruglov, V, Kruglova, L, Kulikov, A, Kuptsov, A, Kuroda, K I, Lamberto, A, Lanaro, A, Lapshin, V G, Lednicky, R, Levi-Sandri, P, Lucherini, V, Manthos, N, Nemenov, Leonid L, Nikitin, M, Okada, K, Olchevskii, V, Penescu, L, Pentia, M, Penzo, Aldo L, Petrascu, C, Pló, M, Pustylnik, Z P, Rappazzo, G F, Riazantsev, A, Romero, A, Rykalin, V I, Saborido, J, Santamarina-Rios, C, Schacher, J, Schütz, C P, Sidorov, A, Smolik, J, Takeutchi, F, Tarasov, A, Tauscher, L, Triantis, F A, Trusov, S V, Vlachos, S, Vázquez, P, Vázquez-Doce, O, Yazkov, V, Yoshimura, Y, Zhabitsky, V M, and Zrelov, V P

Subjects
Detectors and Experimental Techniques
Published
2004

4. First observation of $\pi$K atom and its lifetime measurement

Author

Adeva, B, Afanasiev, L G, Berka, Z, Brekhovskikh, V, Caragheorgheopol, G, Cechák, T, Chiba, M, Costantini, S, Constantinescu, S, Détraz, C, Doudarev, A, Drijard, Daniel, Evangelou, I, Ferro-Luzzi, M, Gallas-Torreira, M V, Gerndt, J, Giacomich, R, Gianotti, P, Giardoni, M, Goldin, D, Gómez, F, Gorin, A, Gortchakov, O E, Guaraldo, C, Hansroul, M, Hosek, R, Iliescu, M A, Jabitski, M, Kalinina, N A, Karpoukhine, V, Kluson, J, Kobayashi, M, Kokkas, P, Komarov, V, Koulikov, A, Kouptsov, A, Krouglov, V, Krouglova, L, Kuroda, K I, Lamberto, A, Lanaro, A, Lapshin, V G, Lednicky, R, Levi-Sandri, P, López-Aguera, A, Lucherini, V, Mäki, T, Manuilov, I V, Manthos, N, Medinsky, M, Montanet, Lucien, Nemenov, L L, Nikitin, M, Okada, K, Olchevskii, V, Pentia, M, Penzo, Aldo L, Petrascu, C, Pló, M, Pop, D, Pustylnik, Z P, Rappazzo, G F, Riazantsev, A, Rodríguez, X M, Rodríguez-Fernández, A M, Rykalin, V I, Santamarina-Rios, C, Saborido, J, Schacher, J, Schütz, C, Sidorov, A, Smolik, J, Takeutchi, F, Tarasov, A, Tauscher, Ludwig, Tobar, M J, Triantis, F A, Trousov, S, Vlachos, S, Yazkov, V V, Yoshimura, Y, Zrelov, V P, and Ponta, T

Subjects
Detectors and Experimental Techniques
Published
2000

5. Lifetime measurement of $\pi^{+}\pi^{-}$ atoms to test low energy QCD predictions

Author

Adeva, B, Afanasiev, L G, Angeles-Lopez, M, Benayoun, M, Chvyrov, A, Ciortea, C, Dumitriu, D, Gianotti, P, Gomes, F, Gorshakov, O, Groza, L, Guaraldo, C, Kalinina, N, Karpukhin, V, Kobayashi, M, Komarov, V, Kruglov, V, Kruglova, L, Kulikov, A, Kuptsov, A, Kuroda, K, Lanaro, A, Le Bornec, Y, Leruste, Ph, Lucherini, V, Maki, T, Micu, L, Montanet, L, Mozzetti, R, Narjoux, J, Nemenov, L, Nichitiu, F, Nikitin, M, Nupieri, M, Okada, K, Okusawa, T, Olshevsky, V, Pazos, A, Pentia, M, Petrascu, M, Petrascu, C, Piticu, I, Plo, M, Ponta, T, Pustylnik, Zh, Rjabkov, D, Rosca, A, Schacher, J, Scheglov, Yu, Selikov, A, Szilagyi, Z, Takeutchi, F, Tarasov, A, Tatischeff, B, Trusov, S, Willis, N, Yazkov, V, Yonnet, J, Yoshida, T, Zghiche, A, Zoran, V, and Zrelov, P

Subjects
Detectors and Experimental Techniques
Published
1994

6. Emulsion-counter hybrid detector for the study of double hypernuclei and the H-dibaryon

Author

Aoki, S, Bahk, S Y, Chung, K S, Chung, S H, Fukuda, O, Hahn, C H, Hara, T, Hirata, S, Hoshino, K, Ieiri, M, Iijima, T, Imai, K, Ishigami, T, Kazuno, M, Kikuchi, K, Kim, C O, Kim, D C, Kim, J Y, Kim, T C, Kitamura, H, Kobayashi, M, Kodama, K, Maeda, Y, Masaike, A, Matsuda, Y, Minakawa, F, Miyanishi, M, Nagoshi, C, Nakamura, M, Nakanishi, S, Nakano, T, Nakazawa, K, Niu, K, Niwa, K, Okabe, H, Ono, S, Park, I G, Park, M S, Sato, Y, Shibuya, H, Shimizu, H M, Song, J S, Tajima, H, Takashima, R, Takeutchi, F, Tanaka, K H, Teranaka, M, Tezuka, I, Togawa, H, Ueda, Y, Ushida, N, Watanabe, S, Yoon, C S, and Yokota, J

Subjects
Detectors and Experimental Techniques
Published
1994

7. RD-17 status report: ultra fast readout of scintillating fibres using upgraded position-sensitive photomultipliers

Author

Agoritsas, V, Akchurin, N, Bergdolt, A M, Bing, O, Bravar, A, Cardini, A, Cavasinni, V, Di Girolamo, B, Ditta, J, Dufournaud, J, Flaminio, Vincenzo, Giacomich, R, Gorin, A M, Khaustov, G V, Kuroda, K, Magaudda, D, Manuilov, I V, Newsom, C R, Okada, K, Okusawa, K, Önel, Y M, Penzo, Aldo L, Rappazzo, G F, Riazantsev, A V, Rykalin, V I, Salvato, G, Schiavon, R P, Sillou, D, Takeutchi, F, Tareb-Reyes, M, and Yoshida, T

Subjects
Detectors and Experimental Techniques
Published
1993

8. RD17 status report: ultra fast readout of scintillating fibres using upgraded position-sensitive photomultipliers

Author

Agoritsas, V, Akchurin, N, Bergdolt, A M, Bing, P, Bravar, S, Ditta, J, Dufournaud, J, Dyachenko, A V, Giacomich, R, Gorin, A M, Kuroda, K, Magaudda, D, Newsom, C R, Okada, K, Önel, Y M, Penzo, Aldo L, Rakhmatov, V E, Rykalin, V I, Salvato, G, Savin, A A, Schiavon, R P, Sillou, D, Soloviev, Yu V, Takeutchi, F, Tareb-Reyes, M, Vasilchenko, V G, Yoshida, T, and Zaychenko, A A

Subjects
Detectors and Experimental Techniques
Published
1992

9. Ultrafast readout of scintillating fibres using upgraded position-sensitive photomultipliers

Author

Agoritsas, V, Akchurin, N, Ditta, J, Dufournaud, J, Giacomich, R, Gorin, A M, Kuroda, K, Meshchanin, A P, Newsom, C R, Nurushev, S B, Önel, Y M, Okada, K, Oshima, N, Pauletta, G, Penzo, Aldo L, Rakhmatov, V E, Rykalin, V I, Salvato, G, Schiavon, R P, Sillou, D, Solovyanov, V L, Takeutchi, F, Vasilev, V, Vasilchenko, V G, Villari, A C C, Yamada, R, and Yoshida, T

Subjects
Physics::Instrumentation and Detectors, Detectors and Experimental Techniques
Abstract

In view of the new possibilities for event detection and tracking in future multi-TeV collider experiments, we propose to improve the performance of position-sensitive photomultipliers and, with it, to realize an ultrafast readout device of scintillating fibres; this should play a unique role in the complex of a future vertex detector, owing to its inherent subnanosecond resolving time as well as its capability of an extremely high counting rate. Our proposal is first aimed at upgrading the position-sensitive PM, in particular its space and time resolutions. Full advantage of the new phototube will be demonstrated in its immediate application to a generic prototype of a scintillating-fibre detector. Our programme also includes intensive R&D on a real-time digitization of the multihit topology, which should provide an essential back-up to the vertex tracking at extremely high rates, one of the most difficult problems relevant to the expected high performance of the LHC.

Published
1991

10. Topological trigger device using scintillating fibres and position-sensitive photomultipliers

Author

Dufournaud, J, Kuroda, K, Sillou, D, Oshima, N, Yamada, R, Agoritsas, A, Akchurin, N, Newsom, C R, Önel, Y M, Takeutchi, F, Giacomich, R, Pauletta, G, Penzo, Aldo L, Salvato, G, Schiavon, R P, Villari, A C C, Toshida, T, Gorin, A, Meshchanin, A P, Nurushev, S B, Rakhmatov, V E, Rykalin, V I, Solovyanov, V L, Vasilchenko, V G, and Vasilev, V

Subjects
Physics::Instrumentation and Detectors, Detectors and Experimental Techniques
Abstract

An approach to a high-quality level-1 trigger is proposed on the basis of a topological device that will be realized by using scintillating fibres and position-sensitive photomultipliers, both of which are considered as potential candidates for new detector components, thanks to their excellent time characteristics and high radiation resistance. The device is characterized, in particular, by its simple concept and reliable functioning, which are a result of the mature technologies employed. In the LHC environment, the major interests of such a scheme reside in its capability to select high ptransv. tracks in real time, in its optional immunity against low ptransv. tracks and loopers, as well as in its effective links to other associated devices within the complex of a vertex detector.

Published
1990

12. Detection of pionium with DIRAC

Author

Lanaro, A., Adeva, B., Afanasev, L., Benayoun, Maurice, Brekhovskikh, V., Caragheorgheopol, G., Cechak, T., Chiba, M., Constantinescu, S., Doudarev, A., Dreossi, D., Drijard, D., Ferro-Luzzi, M., Gallas Torreira, T., Gerndt, J., Giacomich, R., Gianotti, P., Gomez, F., Gorin, A., Gortchakov, O., Guaraldo, C., Hansroul, M., Hosek, R., Iliescu, M., Kalinina, N., Karpoukhine, V., Kluson, J., Kobayashi, M., Kokkas, P., Komarov, V., Koulikov, A., Kouptsov, A., Krouglov, V., Krouglova, L., Kuroda, K. I., Lapshine, V., Richard Lednicky, Leruste, P., Levi Sandri, P., Lopez Aguera, A., Lucherini, V., Maki, T., Manuilov, I., Montanet, L., Narjoux, J. L., Nemenov, L., Nikitin, M., Nunez Pardo, T., Okada, K., Olchevsky, V., Pazos, A., Pentia, M., Penzo, A., Perreau, J. M., Petrascu, C., Plo, M., Ponta, T., Pop, D., Riazantsev, A., Rodriguez, J. M., Rodriguez Fernandez, A., Rykaline, V., Santamarina, C., Schacher, J., Sidorov, A., Smolik, J., Takeutchi, F., Tarasov, A., Tauscher, L., Trusov, Sergey V., Vazquez, P., Vlachos, S., Yazkov, V., Yoshimura, Y., and Zrelov, P.

Subjects
High Energy Physics::Lattice, High Energy Physics::Experiment, Detectors and Experimental Techniques, Nuclear Experiment
Abstract

The aim of the DIRAC experiment at CERN is to provide an accurate determination of S-wave pion-pion scattering lengths from the measurement of the lifetime of the pi+ pi- atom. The measurement will be done with precision comparable to the level of accuracy of theoretical predictions, formulated in the context of Chiral Perturbation Theory. Therefore, the understanding of chiral symmetry breaking of QCD will be submitted to a stringent test. The aim of the DIRAC experiment at CERN is to provide an accurate determination of S-wave pion-pion scattering lengths from the measurement of the lifetime of the pi+ pi- atom. The measurement will be done with precision comparable to the level of accuracy of theoretical predictions, formulated in the context of Chiral Perturbation Theory. Therefore, the understanding of chiral symmetry breaking of QCD will be submitted to a stringent test.

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