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Observation of ψ(3686)→n¯n and improved measurement of ψ(3686)→p¯p
Inst High Energy Phys, Beijing 100049, Peoples R China.
GI Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia.
Helmholtz Inst Mainz, Johann Joachim Becher Weg 45, D-55099 Mainz, Germany.
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2018 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 98, no 3, article id 032006Article in journal (Refereed) Published
Abstract [en]

We observe the decay psi (3686) -> n (n) over bar for the first time and measure psi (3686) -> p (p) over bar with improved accuracy by using 1.07 x 10(8) psi (3686) events collected with the BESIII detector. The measured branching fractions are B(psi(3686) -> n (n) over bar) = (3.06 +/- 0.06 +/- 0.14) x 10(-4) and B(psi(3686) -> p (p) over bar) = (3.05 +/- 0.02 +/- 0.12) x 10(-4). Here, the first uncertainties are statistical, and the second ones are systematic. With the hypothesis that the polar angular distributions of the neutron and proton in the center-of-mass system obey 1 + alpha cos(2) theta, we determine the a parameters to be alpha(n (n) over bar) = 0.68 +/- 0.12 +/- 0.11 and alpha(p (p) over bar) = 1.03 +/- 0.06 +/- 0.03 for psi(3686) -> n (n) over bar and psi(3686) -> p (p) over bar, respectively.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2018. Vol. 98, no 3, article id 032006
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Subatomic Physics Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:uu:diva-364398DOI: 10.1103/PhysRevD.98.032006ISI: 000441334500003OAI: oai:DiVA.org:uu-364398DiVA, id: diva2:1260183
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Swedish Research CouncilAvailable from: 2018-11-01 Created: 2018-11-01 Last updated: 2018-11-01Bibliographically approved

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Andersson, Walter IkegamiJohansson, TordKupsc, AndrzejLi, CuiPapenbrock, MichaelPettersson, JoachimSchönning, KarinWolke, Magnus

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Physical Review D: covering particles, fields, gravitation, and cosmology
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