Study of the Dalitz decay J / ψ → e + e − η

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doi:10.1103/PhysRevD.99.012006

Title: Study of the Dalitz decay $J / ψ \to e^{+} e^{-} η$

Journal Article · Wed Jan 09 00:00:00 EST 2019 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.99.012006· OSTI ID:1490147

Ablikim, M.; Achasov, M. N.; Ahmed, S.; Albrecht, M.; Alekseev, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Ban, Y.; Begzsuren, K.; Bennett, D. W.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F.; Boger, E. more »

We examine the electromagnetic Dalitz decay J/ψ → e⁺e^-η and search for di-electron decays of a dark gauge boson (γ') in J/ψ → γ'η with the two η decay modes η → γγ and η → $$\pi$$⁺$$\pi$$^-$$\pi$$⁰ using (1310.6 ± 7.0) × 10⁶ J/ψ events collected with the BESIII detector. The branching fraction of J/ψ → e⁺e^-η is measured to be (1.43 ± 0.04(stat) ± 0.06(syst)) × 10^-5, with a precision that is improved by a factor of 1.5 over the previous BESIII measurement. The corresponding dielectron invariant mass dependent modulus square of the transition form factor is explored for the first time, and the pole mass is determined to be Λ = 2.84 ± 0.11(stat) ± 0.08(syst) GeV/c². We find no evidence of γ' production and set 90% confidence level upper limits on the product branching fraction $$\mathcal{B(J/ψ → γ'η)× B(γ' → e^+e^-)}$$ as well as the kinetic mixing strength between the Standard Model photon and γ' in the mass range of 0.01 ≤ m_γ' ≤ 2.4 GeV/c².

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Research Organization:: George Washington Univ. Virginia Science & Technology Campus, Asburn, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: BESIII Collaboration

Grant/Contract Number:: FG02-05ER41374; SC-0010118; SC-0010504; SC-0012069; SC0016583

OSTI ID:: 1490147

Alternate ID(s):: OSTI ID: 1504224

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 99 Journal Issue: 1; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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On the use of the covariance matrix to fit correlated data D'Agostini, G. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 346, Issue 1-2 https://doi.org/10.1016/0168-9002(94)90719-6	journal	July 1994
Electromagnetic decays of light mesons Landsberg, L. G. Physics Reports, Vol. 128, Issue 6 https://doi.org/10.1016/0370-1573(85)90129-2	journal	November 1985
Two U(1)'s and ϵ charge shifts Holdom, Bob Physics Letters B, Vol. 166, Issue 2 https://doi.org/10.1016/0370-2693(86)91377-8	journal	January 1986
Design and construction of the BESIII detector Ablikim, M.; An, Z. H.; Bai, J. Z. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 614, Issue 3 https://doi.org/10.1016/j.nima.2009.12.050	journal	March 2010
Study of the ρ and ω meson decays into a pseudoscalar meson and <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> pair with the CMD-2 detector Akhmetshin, R. R.; Aulchenko, V. M.; Banzarov, V. Sh. Physics Letters B, Vol. 613, Issue 1-2 https://doi.org/10.1016/j.physletb.2005.03.019	journal	April 2005
Study of the electromagnetic transition form-factors in <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>η</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>μ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>μ</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mi>γ</mml:mi></mml:math> and <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>ω</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>μ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>μ</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> decays with NA60 Arnaldi, R.; Banicz, K.; Castor, J. Physics Letters B, Vol. 677, Issue 5 https://doi.org/10.1016/j.physletb.2009.05.029	journal	June 2009
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Dark photon search in the mass range between 1.5 and 3.4 GeV/ c 2 Ablikim, M.; Achasov, M. N.; Ai, X. C. Physics Letters B, Vol. 774 https://doi.org/10.1016/j.physletb.2017.09.067	journal	November 2017
The muon g−2 Jegerlehner, Fred; Nyffeler, Andreas Physics Reports, Vol. 477, Issue 1-3 https://doi.org/10.1016/j.physrep.2009.04.003	journal	June 2009
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Searching for the light dark gauge boson in GeV-scale experiments Reece, Matthew; Wang, Lian-Tao Journal of High Energy Physics, Vol. 2009, Issue 07 https://doi.org/10.1088/1126-6708/2009/07/051	journal	July 2009
Event generators at BESIII Rong-Gang, Ping Chinese Physics C, Vol. 32, Issue 8 https://doi.org/10.1088/1674-1137/32/8/001	journal	August 2008
A photon conversion finder at BESIII Xu, Zhi-Rui; He, Kang-Lin Chinese Physics C, Vol. 36, Issue 8 https://doi.org/10.1088/1674-1137/36/8/010	journal	August 2012
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