Determination of ππ scattering lengths from measurement of π+π− atom lifetime
B. AdevaSantiago de Compostela University, SpainL. AfanasyevJINR Dubna, RussiaM. BenayounLPNHE des Universites Paris VI/VII, IN2P3-CNRS, FranceA. BenelliZurich University, SwitzerlandZ. BerkaCzech Technical University in Prague, Prague, Czech RepublicV. BrekhovskikhIHEP Protvino, RussiaG. CaragheorgheopolIFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, RomaniaT. ČechákCzech Technical University in Prague, 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, RomaniaS. CostantiniBasel University, SwitzerlandC. CurceanuIFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, RomaniaP. DoskarovaCzech Technical University in Prague, Prague, Czech RepublicDiego DreossiINFN, Sezione di Trieste and Trieste University, Trieste, ItalyD. DrijardCERN, Geneva, SwitzerlandD. DudaJINR Dubna, RussiaM. Ferro-LuzziCERN, Geneva, SwitzerlandJ.L. Fungueiriño PazosSantiago de Compostela University, SpainM. Gallas TorreiraCERN , Geneva , SwitzerlandJ. GerndtCzech Technical University in Prague , Prague , Czech RepublicP. GianottiINFN , Laboratori Nazionali di Frascati , Frascati , ItalyD. GoldinBasel University , SwitzerlandF. GómezSantiago de Compostela University , SpainA. GorinIHEP Protvino , RussiaO.E. GorchakovSantiago de Compostela University, SpainC. GuaraldoINFN , Laboratori Nazionali di Frascati , Frascati , ItalyM. GugiuCERN, Geneva, SwitzerlandM. HansroulCERN , Geneva , SwitzerlandZ. HonsNuclear Physics Institute ASCR , Rez , Czech RepublicR. HošekCzech Technical University in Prague , Prague , Czech RepublicM. IliescuIFIN-HH , National Institute for Physics and Nuclear Engineering , Bucharest , RomaniaV.V. KarpukhinJINR Dubna , RussiaJ. KlusoňCzech Technical University in Prague , Prague , Czech RepublicM. KobayashiKEK , Tsukuba , JapanP. KokkasSantiago de Compostela University, SpainV. KomarovJINR Dubna , RussiaV.V. KruglovJINR Dubna , RussiaL. KruglovaSantiago de Compostela University, SpainA. KulikovJINR Dubna , RussiaA.V. KuptsovJINR Dubna , RussiaK. KurodaIHEP Protvino, RussiaA. LambertoINFN , Sezione di Trieste and Messina University , Messina , ItalyA. LanaroCERN , Geneva , SwitzerlandV.G. LapshinJINR Dubna, RussiaR. LednickýInstitute of Physics ASCR , Prague , Czech RepublicPh. LerusteLPNHE des Universites Paris VI/VII , IN2P3-CNRS , FranceP. Levi SandriSantiago de Compostela University, SpainA. López AgüeraSantiago de Compostela University , SpainV. LucheriniJINR Dubna, RussiaT. MäkiUOEH-Kyushu , JapanI. ManuilovIHEP Protvino , RussiaJ. MarínCentro de Investigaciones Energéticas, Medioambientales y TecnológicasJ.L. NarjouxLPNHE des Universites Paris VI/VII , IN2P3-CNRS , FranceL.L. NemenovJINR Dubna , RussiaM. NikitinJINR Dubna , RussiaTamara PardoIFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, RomaniaK. OkadaKyoto Sangyo University, Kyoto, JapanV. OlchevskiiJINR Dubna , RussiaA. PazosSantiago de Compostela University, SpainM. PentiaIFIN-HH , National Institute for Physics and Nuclear Engineering , Bucharest , RomaniaA. PenzoINFN, Sezione di Trieste, Trieste, ItalyJ.M. PerreauCERN , Geneva , SwitzerlandM. PlóCERN, Geneva, SwitzerlandT. PontaIFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, RomaniaG.F. RappazzoA. RiazantsevIHEP Protvino , RussiaJ. Molina RodriguezA. Rodriguez FernandezA. Romero VidalINFN , Laboratori Nazionali di Frascati , Frascati , ItalyV. M. RonjinV.I. RykalinJINR Dubna, RussiaJ. SaboridoSantiago de Compostela University, SpainC. Santamarina RíosIFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, RomaniaJ. SchacherUniversity of Bern, Bern, SwitzerlandC. SchuetzUniversity of Basel, Basel, SwitzerlandA. SidorovJ. SmolíkCzech Technical University in Prague, Prague, CzechiaF. TakéutchiKyoto Sangyo University, Kyoto, JapanA.V. TarasovL. TauscherUniversity of Basel, Basel, SwitzerlandM.J. TobarT. TrojekCzech Technical University in Prague, Prague, CzechiaS. TrusovSkobeltsin Institute for Nuclear Physics of Moscow State University , Moscow , RussiaVladimir A. UtkinJINR Dubna, RussiaO. Vázquez DoceSantiago de Compostela University, SpainS. VlachosUniversity of Basel, Basel, SwitzerlandO. O. VoskresenskayaSantiago de Compostela University, SpainT. VrbaCzech Technical University in Prague, Prague, CzechiaC. WillmottUniversidade de Santiago de Compostela, Santiago de Compostela, SpainV. YazkovLomonosov Moscow State University, Moscow, RussiaY. YoshimuraHigh Energy Accelerator Research Organization, Tsukuba, JapanM. ZhabitskyCERN, Geneva, SwitzerlandP. ZrelovSantiago de Compostela University, Spain
2011lv
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Annotatsiya
The DIRAC experiment at CERN has achieved a sizeable production of π+π− atoms and has significantly improved the precision on its lifetime determination. From a sample of 21 227 atomic pairs, a 4% measurement of the S-wave ππ scattering length difference |a0−a2|=(0.2533−0.0078+0.0080|stat|syst−0.0073+0.0078)Mπ+−1 has been attained, providing an important test of Chiral Perturbation Theory.
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