Observation of ψ(3686)→nn¯ and improved measurement of ψ(3686)→pp¯

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doi:10.1103/PhysRevD.98.032006

Title: Observation of $ψ (3686) \to n \bar{n}$ and improved measurement of $ψ (3686) \to p \bar{p}$

Journal Article · Fri Aug 10 00:00:00 EDT 2018 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.98.032006· OSTI ID:1463939

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

Here, we observe the decay ψ(3686) → n$$\bar{n}$$ for the first time and measure ψ(3686) → p$$\bar{p}$$ with improved accuracy by using 1.07 × 10⁸ ψ(3686) events collected with the BESIII detector. The measured branching fractions are $$\mathscr{B}$$(ψ(3686) → n$$\bar{n}$$) = (3.06 ± 0.06 ± 0.14) × 10^-4 and $$\mathscr{B}$$(ψ(3686) → p$$\bar{p}$$) = (3.05±0.02±0.12) × 10^-4. Here, the first uncertainties are statistical and the second ones systematic. With the hypothesis that the polar angular distributions of the neutron and proton in the center-of-mass system obey 1 + α cos² θ, we determine the α parameters to be α_n$$\bar{n}$$ = 0.68 ± 0.12 ± 0.11 and α_p$$\bar{p}$$ = 1.03 ± 0.06 ± 0.03 for ψ(3686) → n$$\bar{n}$$ and ψ(3686) → p$$\bar{p}$$, respectively.

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Research Organization:: George Washington Univ., Washington, DC (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; SC- 0010118

OSTI ID:: 1463939

Alternate ID(s):: OSTI ID: 1468655

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Vol. 98 Journal Issue: 3; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Title: Observation of $ψ (3686) \to n \bar{n}$ and improved measurement of $ψ (3686) \to p \bar{p}$