Evidence for πK-atoms with DIRAC
B. AdevaIGFAE, Santiago de Compostela University, SpainL. AfanasyevJINR Dubna, RussiaY. AllkoferPhysik-Institut der Universität Zürich, SwitzerlandC. AmslerPhysik-Institut der Universität Zürich, SwitzerlandA. AnaniaINFN, Messina University, Messina, ItalyA. BenelliPhysik-Institut der Universität Zürich, SwitzerlandV. BrekhovskikhIHEP Protvino, RussiaG. CaragheorgheopolIFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, RomaniaT. ČechákCzech Technical University, Prague, Czech RepublicM. ChibaTokyo Metropolitan University, JapanP. ChliapnikovIHEP Protvino, RussiaC. CiocarlanIFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, RomaniaS. ConstantinescuIFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, RomaniaC. CurceanuINFN, Laboratori Nazionali di Frascati, Frascati, ItalyC. DetrazCERN, Geneva, SwitzerlandDiego DreossiINFN, Trieste University, Trieste, ItalyD. DrijardCERN, Geneva, SwitzerlandA. DudarevJINR Dubna, RussiaM. DūmaIFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, RomaniaD. DumitriuIFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, RomaniaJ.L. FungueiriñoIGFAE , Santiago de Compostela University , SpainJ. GerndtCzech Technical University , Prague , Czech RepublicA. GorinIHEP Protvino , RussiaO.E. GorchakovINFN, Trieste University, Trieste, ItalyK. GritsayJINR Dubna , RussiaC. GuaraldoCERN, Geneva, SwitzerlandM. GugiuIFIN-HH , National Institute for Physics and Nuclear Engineering , Bucharest , RomaniaM. HansroulCERN , Geneva , SwitzerlandZ. HonsNuclear Physics Institute ASCR , Rez , Czech RepublicShin HorikawaPhysik-Institut der Universität Zürich , SwitzerlandM. IliescuINFN , Laboratori Nazionali di Frascati , Frascati , ItalyV.V. KarpukhinJINR Dubna , RussiaJ. KlusoňCzech Technical University , Prague , Czech RepublicM. KobayashiKEK , Tsukuba , JapanV. KomarovJINR Dubna , RussiaV.V. KruglovJINR Dubna , RussiaL. KruglovaJINR Dubna , RussiaA. KulikovSkobeltsin Institute for Nuclear Physics of Moscow State University, Moscow, RussiaA.V. KuptsovSkobeltsin Institute for Nuclear Physics of Moscow State University, Moscow, RussiaI. KurochkinIHEP Protvino , RussiaA. LambertoINFN , Messina University , Messina , ItalyA. LanaroINFN , Laboratori Nazionali di Frascati , Frascati , ItalyV.G. LapshinJINR Dubna, RussiaR. LednickýInstitute of Physics ACSR , Prague , Czech RepublicP. Levi SandriIHEP Protvino, RussiaA. López AgüeraIGFAE , Santiago de Compostela University , SpainV. LucheriniINFN , Laboratori Nazionali di Frascati , Frascati , ItalyI. ManuilovIFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, RomaniaC. MariñasCERN, Geneva, SwitzerlandL.L. NemenovIFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, RomaniaM. NikitinIFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, RomaniaK. OkadaKyoto Sangyo University , Kyoto , JapanV. OlchevskiiJINR Dubna , RussiaM. PentiaIFIN-HH , National Institute for Physics and Nuclear Engineering , Bucharest , RomaniaA. PenzoINFN, Trieste University, Trieste, ItalyM. PlóIGFAE , Santiago de Compostela University , SpainG.F. RappazzoINFN , Messina University , Messina , ItalyC. RegenfusPhysik-Institut der Universität Zürich , SwitzerlandJ. RochetPhysik-Institut der Universität Zürich , SwitzerlandA. RomeroIGFAE , Santiago de Compostela University , SpainV. M. RonjinJINR Dubna, RussiaA. V. RyazantsevIHEP Protvino , RussiaV.I. RykalinIHEP Protvino , RussiaJ. SaboridoCERN, Geneva, SwitzerlandJ. SchacherUniversity of Bern, Bern, SwitzerlandA. SidorovIHEP Protvino , RussiaJ. SmolíkCERN, Geneva, SwitzerlandS. SugimotoHigh Energy Accelerator Research Organization, Tsukuba, JapanF. TakéutchiKyoto Sangyo University, Kyoto, JapanA.V. TarasovSkobeltsin Institute for Nuclear Physics of Moscow State University, Moscow, RussiaL. TauscherBasel University , SwitzerlandT. TrojekCzech Technical University in Prague, Prague, CzechiaS. TrusovLomonosov Moscow State University, Moscow, RussiaVladimir A. UtkinJINR Dubna, RussiaO. Vázquez DoceINFN, Trieste University, Trieste, ItalyT. VrbaCzech Technical University in Prague, Prague, CzechiaV. YazkovLomonosov Moscow State University, Moscow, RussiaY. YoshimuraHigh Energy Accelerator Research Organization, Tsukuba, JapanM. ZhabitskyIFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, RomaniaP. ZrelovIHEP Protvino, Russia
2009en
Ochiq kirishGibrid
Litsenziya: cc-by
ABI
Annotatsiya
We present evidence for the first observation of electromagnetically bound π±K∓-pairs (πK-atoms) with the DIRAC experiment at the CERN-PS. The πK-atoms are produced by the 24GeV/c proton beam in a thin Pt-target and the π± and K∓-mesons from the atom dissociation are analyzed in a two-arm magnetic spectrometer. The observed enhancement at low relative momentum corresponds to the production of 173±54 πK-atoms. The mean life of πK-atoms is related to the s-wave πK-scattering lengths, the measurement of which is the goal of the experiment. From these first data we derive a lower limit for the mean life of 0.8 fs at 90% confidence level.
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