Study of η′ → π+π−l+l− decays at BESIII

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dc.authorscopusidOnur Buğra Kolcu / 57936993500
dc.authorscopusidSerkant Ali Çetin / 34567544400
dc.authorwosidSerkant Ali Çetin / AGF-0147-2022
dc.authorwosidOnur Buğra Kolcu / P-4990-2015
dc.contributor.authorAblikim, M.
dc.contributor.authorAchasov M.N.
dc.contributor.authorAdlarson P.
dc.contributor.authorÇetin, Serkant Ali
dc.date.accessioned2025-04-18T09:15:49Z
dc.date.available2025-04-18T09:15:49Z
dc.date.issued2024
dc.departmentİstinye Üniversitesi, Rektörlük, Temel Bilimler Bölümü
dc.description.abstractWith a sample of (10087 +/- 44) x 10(6)J/psi events accumulated with the BESIII detector, we analyze the decays eta ' -> pi(+)pi(-)l(+)l(-)(l = e, mu) via the process J/psi -> gamma eta '. The branching fractions are measured to be B(eta ' -> pi(+)pi(-)e(+)e(-)) = (2.45 +/- 0.02(stat.) +/- 0.08(syst.)) x 10(-3) and B(eta ' -> pi(+)pi(-)mu(+)mu(-)) = (2.16 +/- 0.12(stat.) +/- 0.06(syst.)) x 10(-5), and the ratio is B(eta '->pi(+)pi(-)e(+)e(-))/B(eta '->pi(+)pi(-)mu(+)mu(-)) =113.4 +/- 0.9(stat.) +/- 3.7(syst.). In addition, by combining the eta ' -> pi(+)pi(-)e(+)e(-) and eta ' -> pi(+)pi(-)mu(+)mu(-) decays, the slope parameter of the electromagnetic transition form factor is measured to be b(eta ')=1.30 +/- 0.19 (GeV/c(2))(-2), which is consistent with previous measurements from BESIII and theoretical predictions from the VMD model. The asymmetry in the angle between the pi(+)pi(-) and l(+)l(-) decay planes, which has the potential to reveal the CP-violation originating from an unconventional electric dipole transition, is also investigated. The asymmetry parameters are determined to be A(CP)(eta '->pi(+)pi(-)e(+)e(-)) = (-0.21 +/- 0.73(stat.) +/- 0.01(syst.))% and A(CP)(eta '->pi(+)pi(-)mu(+)mu(-)) = (0.62 +/- 4.71(stat.) +/- 0.08(syst.))%, implying that no evidence of CP-violation is observed at the present statistics. Finally, an axion-like particle is searched for via the decay eta ' -> pi(+)pi(-)a, a -> e(+)e(-), and upper limits of the branching fractions are presented for the mass assumptions of the axion-like particle in the range of 0 - 500 MeV/c(2).
dc.identifier.citationAblikim, M., Achasov, M. N., Adlarson, P., Afedulidis, O., Ai, X. C., Aliberti, R., ... & Hölzken, F. (2024). Study of η′→ π+ π− l+ l− decays at BESIII. Journal of High Energy Physics, 2024(7), 1-27.
dc.identifier.doi10.1007/JHEP07(2024)135
dc.identifier.endpage26
dc.identifier.issn10298479
dc.identifier.issue7
dc.identifier.scopus2-s2.0-85199183813
dc.identifier.scopusqualityQ1
dc.identifier.startpage1
dc.identifier.urihttp://dx.doi.org/10.1007/JHEP07(2024)135
dc.identifier.urihttps://hdl.handle.net/20.500.12713/6734
dc.identifier.wosWOS:001350126500001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorÇetin, Serkant Ali
dc.institutionauthorKolcu, Onur Buğra
dc.institutionauthoridOnur Buğra Kolcu / 0000-0002-9177-1286
dc.institutionauthoridSerkant Ali Çetin / 0000-0001-5050-8441
dc.language.isoen
dc.publisherSpringer science and bsiness media deutschland GmbH
dc.relation.ispartofJournal of high energy physics
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectCP Violation
dc.subjectDark Matter
dc.subjecte+-e− Experiments
dc.subjectQCD
dc.titleStudy of η′ → π+π−l+l− decays at BESIII
dc.typeArticle

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