First Measurement of a Long-Lived π^{+}π^{-} Atom Lifetime
The adapted DIRAC experiment at the CERN PS accelerator observed for the first time long-lived hydrogenlike π^{+}π^{-} atoms, produced by protons hitting a beryllium target. A part of these atoms crossed the gap of 96 mm between the target and a 2.1 μm thick platinum foil, in which most of them dissociated. Analyzing the observed number of atomic pairs, n_{A}^{L}=436_{-61}^{+157}|_{tot}, the lifetime of the 2p state is found to be τ_{2p}=(0.45_{-0.30}^{+1.08}|_{tot})×10^{-11} s, not contradicting the corresponding QED 2p state lifetime τ_{2p}^{QED}=1.17×10^{-11} s. This lifetime value is three orders of magnitude larger than our previously measured value of the π^{+}π^{-} atom ground state lifetime τ=(3.15_{-0.26}^{+0.28}|_{tot})×10^{-15} s. Further studies of long-lived π^{+}π^{-} atoms will allow us to measure energy differences between p and s atomic states and so to discriminate between the isoscalar and isotensor ππ scattering lengths with the aim to check QCD predictions.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2019 |
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| Erschienen: |
2019 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:122 |
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| Enthalten in: |
Physical review letters - 122(2019), 8 vom: 01. März, Seite 082003 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Adeva, B [VerfasserIn] |
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| Anmerkungen: |
Date Completed 03.04.2019 Date Revised 03.04.2019 published: Print Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1103/PhysRevLett.122.082003 |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM295546565 |
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| 245 | 1 | 0 | |a First Measurement of a Long-Lived π^{+}π^{-} Atom Lifetime |
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| 500 | |a Date Completed 03.04.2019 | ||
| 500 | |a Date Revised 03.04.2019 | ||
| 500 | |a published: Print | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a The adapted DIRAC experiment at the CERN PS accelerator observed for the first time long-lived hydrogenlike π^{+}π^{-} atoms, produced by protons hitting a beryllium target. A part of these atoms crossed the gap of 96 mm between the target and a 2.1 μm thick platinum foil, in which most of them dissociated. Analyzing the observed number of atomic pairs, n_{A}^{L}=436_{-61}^{+157}|_{tot}, the lifetime of the 2p state is found to be τ_{2p}=(0.45_{-0.30}^{+1.08}|_{tot})×10^{-11} s, not contradicting the corresponding QED 2p state lifetime τ_{2p}^{QED}=1.17×10^{-11} s. This lifetime value is three orders of magnitude larger than our previously measured value of the π^{+}π^{-} atom ground state lifetime τ=(3.15_{-0.26}^{+0.28}|_{tot})×10^{-15} s. Further studies of long-lived π^{+}π^{-} atoms will allow us to measure energy differences between p and s atomic states and so to discriminate between the isoscalar and isotensor ππ scattering lengths with the aim to check QCD predictions | ||
| 650 | 4 | |a Journal Article | |
| 700 | 1 | |a Afanasyev, L |e verfasserin |4 aut | |
| 700 | 1 | |a Anania, A |e verfasserin |4 aut | |
| 700 | 1 | |a Aogaki, S |e verfasserin |4 aut | |
| 700 | 1 | |a Benelli, A |e verfasserin |4 aut | |
| 700 | 1 | |a Brekhovskikh, V |e verfasserin |4 aut | |
| 700 | 1 | |a Cechak, T |e verfasserin |4 aut | |
| 700 | 1 | |a Chiba, M |e verfasserin |4 aut | |
| 700 | 1 | |a Chliapnikov, P V |e verfasserin |4 aut | |
| 700 | 1 | |a Doskarova, P |e verfasserin |4 aut | |
| 700 | 1 | |a Drijard, D |e verfasserin |4 aut | |
| 700 | 1 | |a Dudarev, A |e verfasserin |4 aut | |
| 700 | 1 | |a Dumitriu, D |e verfasserin |4 aut | |
| 700 | 1 | |a Fluerasu, D |e verfasserin |4 aut | |
| 700 | 1 | |a Gorin, A |e verfasserin |4 aut | |
| 700 | 1 | |a Gorchakov, O |e verfasserin |4 aut | |
| 700 | 1 | |a Gritsay, K |e verfasserin |4 aut | |
| 700 | 1 | |a Guaraldo, C |e verfasserin |4 aut | |
| 700 | 1 | |a Gugiu, M |e verfasserin |4 aut | |
| 700 | 1 | |a Hansroul, M |e verfasserin |4 aut | |
| 700 | 1 | |a Hons, Z |e verfasserin |4 aut | |
| 700 | 1 | |a Horikawa, S |e verfasserin |4 aut | |
| 700 | 1 | |a Iwashita, Y |e verfasserin |4 aut | |
| 700 | 1 | |a Karpukhin, V |e verfasserin |4 aut | |
| 700 | 1 | |a Kluson, J |e verfasserin |4 aut | |
| 700 | 1 | |a Kobayashi, M |e verfasserin |4 aut | |
| 700 | 1 | |a Kruglov, V |e verfasserin |4 aut | |
| 700 | 1 | |a Kruglova, L |e verfasserin |4 aut | |
| 700 | 1 | |a Kulikov, A |e verfasserin |4 aut | |
| 700 | 1 | |a Kulish, E |e verfasserin |4 aut | |
| 700 | 1 | |a Lamberto, A |e verfasserin |4 aut | |
| 700 | 1 | |a Lanaro, A |e verfasserin |4 aut | |
| 700 | 1 | |a Lednicky, R |e verfasserin |4 aut | |
| 700 | 1 | |a Mariñas, C |e verfasserin |4 aut | |
| 700 | 1 | |a Martincik, J |e verfasserin |4 aut | |
| 700 | 1 | |a Nemenov, L |e verfasserin |4 aut | |
| 700 | 1 | |a Nikitin, M |e verfasserin |4 aut | |
| 700 | 1 | |a Okada, K |e verfasserin |4 aut | |
| 700 | 1 | |a Olchevskii, V |e verfasserin |4 aut | |
| 700 | 1 | |a Ovsiannikov, V |e verfasserin |4 aut | |
| 700 | 1 | |a Pentia, M |e verfasserin |4 aut | |
| 700 | 1 | |a Penzo, A |e verfasserin |4 aut | |
| 700 | 1 | |a Plo, M |e verfasserin |4 aut | |
| 700 | 1 | |a Prusa, P |e verfasserin |4 aut | |
| 700 | 1 | |a Rappazzo, G F |e verfasserin |4 aut | |
| 700 | 1 | |a Romero Vidal, A |e verfasserin |4 aut | |
| 700 | 1 | |a Ryazantsev, A |e verfasserin |4 aut | |
| 700 | 1 | |a Rykalin, V |e verfasserin |4 aut | |
| 700 | 1 | |a Saborido, J |e verfasserin |4 aut | |
| 700 | 1 | |a Schacher, J |e verfasserin |4 aut | |
| 700 | 1 | |a Sidorov, A |e verfasserin |4 aut | |
| 700 | 1 | |a Smolik, J |e verfasserin |4 aut | |
| 700 | 1 | |a Takeutchi, F |e verfasserin |4 aut | |
| 700 | 1 | |a Trojek, T |e verfasserin |4 aut | |
| 700 | 1 | |a Trusov, S |e verfasserin |4 aut | |
| 700 | 1 | |a Urban, T |e verfasserin |4 aut | |
| 700 | 1 | |a Vrba, T |e verfasserin |4 aut | |
| 700 | 1 | |a Yazkov, V |e verfasserin |4 aut | |
| 700 | 1 | |a Yoshimura, Y |e verfasserin |4 aut | |
| 700 | 1 | |a Zrelov, P |e verfasserin |4 aut | |
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