Measurement of B ( J / ψ → η ′ e + e − ) and search for a dark photon

Ablikim, M.; Achasov, M. N.; Ahmed, S.; Albrecht, M.; Alekseev, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; 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.; Boyko, I.; Briere, R. A.; Cai, H.; Cai, X.; Cakir, O.; Calcaterra, A.; Cao, G. F.; Cetin, S. A.; Chai, J.; Chang, J. F.; Chelkov, G.; Chen, G.; Chen, H. S.; Chen, J. C.; Chen, M. L.; Chen, P. L.; Chen, S. J.; Chen, X. R.; Chen, Y. B.; Chu, X. K.; Cibinetto, G.; Cossio, F.; Dai, H. L.; Dai, J. P.; Dbeyssi, A.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, Y.; Dong, C.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dou, Z. L.; Du, S. X.; Duan, P. F.; Fang, J.; Fang, S. S.; Fang, Y.; Farinelli, R.; Fava, L.; Fegan, S.; Feldbauer, F.; Felici, G.; Feng, C. Q.; Fioravanti, E.; Fritsch, M.; Fu, C. D.; Gao, Q.; Gao, X. L.; Gao, Y.; Gao, Y. 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doi:10.1103/PhysRevD.99.012013

Title: Measurement of $B (J / ψ \to η' e^{+} e^{-})$ and search for a dark photon

Journal Article · Mon Jan 28 00:00:00 EST 2019 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.99.012013· OSTI ID:1492477

Ablikim, M.; Achasov, M. N.; Ahmed, S.; Albrecht, M.; Alekseev, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; 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. more »

Utilizing a data sample of (1310.6 ± 7.0) × 10⁶ J/ψ events collected with the BESIII detector at BEPCII, we study the electromagnetic Dalitz decay J/ψ→η'e⁺e^- with two dominant η' decay modes, η'→γ$$\pi$$⁺$$\pi$$^- and η'→$$\pi$$⁺$$\pi$$^- . The branching fraction is determined to be $$\mathcal{B(J/ψ→η'e^+e^-)}$$ = (6.79 ± 0.08 ± 0.35) × 10^-5, which improves in precision by a factor of 2 over the previous BESIII measurement. A search for the dark photon ( γ') is performed via J/ψ → η'γ' ,γ' → e⁺e^- . Excluding the ω and Φ mass regions, no significant signal is observed in the mass range from 0.1 to 2.1 GeV /c² . We set upper limits at the 90% confidence level on $$\mathcal{B(J/ψ→η'γ')}$$ × $$\mathcal{B(γ'→e^+e^-)}$$ , $$\mathcal{B(J/ψ→η'γ')}$$ and the mixing strength as a function of dark photon mass. This is among the first searches for dark photons in charmonium decays.

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Research Organization:: George Washington Univ. Virginia Science & Technology Campus, Ashburn, 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:: 1492477

Alternate ID(s):: OSTI ID: 1504171

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: 9 works

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