Observation of a fine structure in e+e−→hadrons production at the nucleon-antinucleon threshold

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dc.contributor.authorAkhmetshin, R.R.
dc.contributor.authorAmirkhanov, A.N.
dc.contributor.authorAnisenkov, A.V.
dc.contributor.authorAulchenko, V.M.
dc.contributor.authorBanzarov, V.Sh.
dc.contributor.authorBashtovoy, N.S.
dc.contributor.authorBerkaev, D.E.
dc.contributor.authorBondar, A.E.
dc.contributor.authorBragin, A.V.
dc.contributor.authorEidelman, S.I.
dc.contributor.authorEpifanov, D.A.
dc.contributor.authorEpshteyn, L.B.
dc.contributor.authorErofeev, A.L.
dc.contributor.authorFedotovich, G.V.
dc.contributor.authorGayazov, S.E.
dc.contributor.authorGrebenuk, A.A.
dc.contributor.authorGribanov, S.S.
dc.contributor.authorGrigoriev, D.N.
dc.contributor.authorIgnatov, F.V.
dc.contributor.authorIvanov, V.L.
dc.contributor.authorKarpov, S.V.
dc.contributor.authorKazanin, V.F.
dc.contributor.authorKoop, I.A.
dc.contributor.authorKirpotin, A.N.
dc.contributor.authorKorobov, A.A.
dc.contributor.authorKozyrev, A.N.
dc.contributor.authorKozyrev, E.A.
dc.contributor.authorKrokovny, P.P.
dc.contributor.authorKuzmenko, A.E.
dc.contributor.authorKuzmin, A.S.
dc.contributor.authorLogashenko, I.B.
dc.contributor.authorLukin, P.A.
dc.contributor.authorMikhailov, K.Yu.
dc.contributor.authorOkhapkin, V.S.
dc.contributor.authorOtboev, A.V.
dc.contributor.authorPestov, Yu.N.
dc.contributor.authorPopov, A.S.
dc.contributor.authorRazuvaev, G.P.
dc.contributor.authorRuban, A.A.
dc.contributor.authorRyskulov, N.M.
dc.contributor.authorRyzhenenkov, A.E.
dc.contributor.authorSenchenko, A.I.
dc.contributor.authorShatunov, Yu.M.
dc.contributor.authorShatunov, P.Yu.
dc.contributor.authorShebalin, V.E.
dc.contributor.authorShemyakin, D.N.
dc.contributor.authorShwartz, B.A.
dc.contributor.authorShwartz, D.B.
dc.contributor.authorSibidanov, A.L.
dc.contributor.authorSolodov, E.P.
dc.contributor.authorTalyshev, A.A.
dc.contributor.authorTitov, V.M.
dc.contributor.authorTolmachev, S.S.
dc.contributor.authorVorobiov, A.I.
dc.contributor.authorZemlyansky, I.M.
dc.contributor.authorYudin, Yu.V.
dc.date.accessioned2019-06-17T16:27:05Z
dc.date.available2019-06-17T16:27:05Z
dc.date.copyright2019en_US
dc.date.issued2019
dc.description.abstractA study of hadron production at the nucleon-antinucleon threshold has been performed with the CMD-3 detector at the VEPP-2000 e+e−collider. The very fast rise with about 1 MeV width has been observed in the e+e−→p¯p cross section. A sharp drop in the e+e−→3(π+π−) cross section has been confirmed and found to have a less than 2 MeV width, in agreement with the observed fast rise of the e+e−→p¯p cross section. For the first time a similar sharp drop is demonstrated in the e+e−→K+K−π+π−cross section. The behavior of the e+e−→3(π+π−),K+K−π+π−cross sections cannot be explained by an interference of any resonance amplitude with continuum, therefore this phenomenon cannot be due to a narrow near-threshold resonance. No such structure has been observed in the e+e−→2(π+π−) cross section.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipThe authors are grateful to A. I. Milstein for useful discussions and help with a theoretical interpretation. We thank the VEPP-2000 personnel for excellent machine operation. Part of this work related to the photon reconstruction algorithm in the electromagnetic calorimeter is supported by the Russian Science Foundation (project #14-50-00080). The work is partially supported by the Russian Foundation for Basic Research grants 16-02-00160-a, 17-02-00327-a, 17-52-50064-a and 18-32-01020. Part of this work related to account of threshold proximity is supported by the MSHE grant 14.W03.31.0026.en_US
dc.identifier.citationAkhmetshin, R.R., Amirkhanov, A.N., Anisenkov, A.V., Aulchenko, V.M., Banzarov, V.Sh., Bashtovoy, N.S., … Yudin, Y.V.(2019). Observation of a fine structure in e+e−→hadrons production at the nucleon-antinucleon threshold. Physics Letters B, 794, 64-68. https://doi.org/10.1016/j.physletb.2019.05.032en_US
dc.identifier.urihttps://doi.org/10.1016/j.physletb.2019.05.032
dc.identifier.urihttp://hdl.handle.net/1828/10926
dc.language.isoenen_US
dc.publisherPhysics Letters Ben_US
dc.subjectVictoria Subatomic Physics and Accelerator Research Centre (VSPA)
dc.subject.departmentDepartment of Physics and Astronomy
dc.titleObservation of a fine structure in e+e−→hadrons production at the nucleon-antinucleon thresholden_US
dc.typeArticleen_US

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