First observation of long-lived π+π− atoms

Autor: B. Adeva, L. Afanasyev, A. Anania, S. Aogaki, A. Benelli, V. Brekhovskikh, T. Cechak, M. Chiba, P. Chliapnikov, P. Doskarova, D. Drijard, A. Dudarev, M. Duma, D. Dumitriu, D. Fluerasu, A. Gorin, O. Gorchakov, K. Gritsay, C. Guaraldo, M. Gugiu, M. Hansroul, Z. Hons, S. Horikawa, Y. Iwashita, V. Karpukhin, J. Kluson, M. Kobayashi, V. Kruglov, L. Kruglova, A. Kulikov, E. Kulish, A. Kuptsov, A. Lamberto, A. Lanaro, R. Lednicky, C. Mariñas, J. Martincik, L. Nemenov, M. Nikitin, K. Okada, V. Olchevskii, V. Ovsiannikov, M. Pentia, A. Penzo, M. Plo, P. Prusa, G. Rappazzo, A. Romero Vidal, A. Ryazantsev, V. Rykalin, J. Saborido, J. Schacher, A. Sidorov, J. Smolik, F. Takeutchi, L. Tauscher, T. Trojek, S. Trusov, T. Urban, T. Vrba, V. Yazkov, Y. Yoshimura, M. Zhabitsky, P. Zrelov

Publikováno v: Physics Letters B, Vol 751, Iss C, Pp 12-18 (2015)

After observing and investigating the double-exotic (a double-exotic atom is a bound system, in which both oppositely charged components are unstable particles like μ,π,K,…) π+π− atom with the ground state lifetime τ of about 3×10−15 s, t

Externí odkaz: https://doaj.org/article/a6fa6cf240f54e65a283d9181db07e9a

Upgraded DIRAC spectrometer at CERN PS for the investigation of ππ and πK atoms

Autor: K. Gritsay, A.V. Kuptsov, Carlos Marinas, V. Kruglov, A. Ryazantsev, Masaaki Kobayashi, Y. Yoshimura, A. Sidorov, V.I. Rykalin, P. Chliapnikov, Bernardo Adeva, Tomáš Trojek, D. Fluerasu, Claude Amsler, P. Prusa, A. Anania, A. I. Kulikov, J. Smolik, Yoshihisa Iwashita, M. Plo, M. Nikitin, P. Doskarova, S. Constantinescu, M. Gugiu, J. Saborido, J. Martincik, M. Hansroul, L. Afanasyev, G. Caragheorgheopol, M. Pentia, R. Lednicky, L. Nemenov, Armando Lanaro, J. Schacher, O.E. Gorchakov, A. Penzo, L. Kruglova, Z. Hons, Y. Allkofer, A. Romero Vidal, O. Ullaland, C. Ciocarlan, L. Tauscher, V. Karpukhin, T. Vrba, Masami Chiba, D. Dumitriu, M. Duma, M. Zhabitsky, V. Brekhovskikh, C. Guaraldo, T. Urban, A. Lamberto, V. Olchevskii, S.V. Trusov, S. Horikawa, Tomáš Čechák, S. Aogaki, A. Benelli, C. Detraz, E. Kulish, D. Drijard, A. Gorin, Fujio Takeutchi, V. Yazkov, J. Kluson, P. Zrelov, K. Okada, A. Dudarev, G.F. Rappazzo

Publikováno v: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 839:52-85

The DIRAC spectrometer installed at CERN PS was upgraded in order to study simultaneously A2π and AπK atoms, namely the bound states of two π mesons, and of π and K mesons, respectively. The detector system can now accept a high intensity beam of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ba172953d904337ecc6e80dbb96bf5cb
https://doi.org/10.1016/j.nima.2016.07.049

Measurement of the πK atom lifetime and the πK scattering length

Autor: L. Nemenov, L. Tauscher, Claude Amsler, P. Federicova, E. Kulish, P. Chliapnikov, Bernardo Adeva, D. Fluerasu, R. Lednicky, A. Anania, Y. Allkofer, V.I. Rykalin, J. Schacher, P. Zrelov, S. Horikawa, A. Romero Vidal, T. Vrba, C. Guaraldo, S. Aogaki, K. Gritsay, S.V. Trusov, P. Prusa, Carlos Marinas, M. Zhabitsky, A. Lamberto, A. Gorin, Yoshihisa Iwashita, Masaki Kobayashi, A. Penzo, M. Plo, A. Dudarev, Y. Yoshimura, M. Gugiu, A. Sidorov, Masami Chiba, V. Yazkov, L. Afanasyev, M. Pentia, V. Brekhovskikh, K. Okada, Fujio Takeutchi, Tomáš Čechák, G.F. Rappazzo, D. Dumitriu, L. Kruglova, Tomáš Trojek, M. Nikitin, J. Saborido, A. Benelli, V. Karpukhin, J. Kluson, J. Martincik, M. Hansroul, O.E. Gorchakov, Z. Hons, A.V. Kuptsov, A. Ryazantsev, D. Drijard, Armando Lanaro, V. Kruglov, A. I. Kulikov, J. Smolik, T. Urban, V. Olchevskii

Publikováno v: Physical Review D. 96

After having announced the statistically significant observation ($5.6\ensuremath{\sigma}$) of the new exotic $\ensuremath{\pi}K$ atom, the DIRAC experiment at the CERN proton synchrotron presents the measurement of the corresponding atom lifetime, b

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::786ef9e6f992eef44ac9e3e618095f91
https://doi.org/10.1103/physrevd.96.052002

Observation ofπ−K+andπ+K−Atoms

Autor: E. Kulish, L. Tauscher, M. Nikitin, V. Olchevskii, L. Kruglova, L. Afanasyev, V. Brekhovskikh, T. Urban, A. I. Kulikov, J. Smolik, A. Romero Vidal, M. Zhabitsky, A. Gorin, D. Fluerasu, A. Lamberto, Fujio Takeutchi, V. Karpukhin, O.E. Gorchakov, M. Pentia, T. Trojek, Y. Allkofer, A. Penzo, T. Vrba, K. Gritsay, J. Saborido, R. Lednicky, A. Anania, Masami Chiba, Masaaki Kobayashi, A.V. Kuptsov, V. Yazkov, A. Ryazantsev, C. Guaraldo, Z. Hons, Yoshihisa Iwashita, M. Plo, S.V. Trusov, V. Kruglov, M. Gugiu, D. Drijard, S. Horikawa, J. Martincik, M. Hansroul, K. Okada, Tomáš Čechák, S. Aogaki, P. Doskarova, D. Dumitriu, Y. Yoshimura, C. Marinas, A. Sidorov, Armando Lanaro, P. Chliapnikov, Bernardo Adeva, V.I. Rykalin, Claude Amsler, P. Prusa, A. Benelli, J. Kluson, G.F. Rappazzo, P. Zrelov, A. Dudarev

Publikováno v: Physical Review Letters. 117

The observation of hydrogenlike πK atoms, consisting of π^{-}K^{+} or π^{+}K^{-} mesons, is presented. The atoms are produced by 24 GeV/c protons from the CERN PS accelerator, interacting with platinum or nickel foil targets. The breakup (ionizati

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1747144d34ad4d5adf73cd74456a2542
https://doi.org/10.1103/physrevlett.117.112001

Determination of ππ scattering lengths from measurement of π+π− atom lifetime

Autor: R. Hosek, S. Vlachos, K. Okada, J. Gerndt, V.I. Komarov, Y. Yoshimura, A. Sidorov, P. Leruste, M.J. Tobar, J.-M. Perreau, L. Nemenov, J. Marín, T. Maki, A. Benelli, T. Vrba, G.F. Rappazzo, Masaaki Kobayashi, A. Lamberto, M. Gallas Torreira, V. Yazkov, A.V. Kuptsov, P. Zrelov, M. Zhabitsky, V.M. Ronjin, C. Guaraldo, D. Dreossi, P. Doskarova, S.V. Trusov, C. Schuetz, A. Romero Vidal, V. Lucherini, T. Nunez Pardo, Josue Molina Rodriguez, A. Dudarev, L. Afanasyev, S. Constantinescu, Masami Chiba, V. Kruglov, Tomáš Čechák, J.-L. Narjoux, M. Pentia, C. Ciocarlan, K. I. Kuroda, J. Kluson, R. Lednicky, O. Voskresenskaya, P. Levi Sandri, D. Drijard, V. Olchevskii, J. Schacher, A. Tarasov, A. Riazantsev, M. Gugiu, A. Rodriguez Fernandez, V. Brekhovskikh, I. Manuilov, O. Vazquez Doce, T. Ponta, C. Curceanu, A. Pazos, A. Penzo, L. Tauscher, T. Trojek, Z. Berka, G. Caragheorgheopol, O. Gorchakov, M. Nikitin, J. Saborido, C. Willmott, Paola Gianotti, M. Ferro-Luzzi, M. Plo, V. Karpukhin, L. Kruglova, D. Goldin, Armando Lanaro, A. I. Kulikov, J. Smolik, S. Costantini, Z. Hons, C. Santamarina, M. Hansroul, J. L. Fungueirino Pazos, Panagiotis Kokkas, A. Lopez Agüera, P. Chliapnikov, Fujio Takeutchi, V. Utkin, Bernardo Adeva, V.I. Rykalin, M. Iliescu, F. Gomez, A. Gorin, V. Lapshin, M. Benayoun

Publikováno v: Physics Letters B. 704:24-29

The DIRAC experiment at CERN has achieved a sizeable production of + atoms and has significantly improved the precision on its lifetime determination. From a sample of 21227 atomic pairs, a 4% measurement of the S-wave scattering length di erence ja0

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::924201713bf03753f7d657b22ffd0266
https://doi.org/10.1016/j.physletb.2011.08.074