Observation of $\psi(3686) \to n\bar{n}$ and improved measurement of $\psi(3686) \to p \bar{p}$ - INSPIRE

DataBETA

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

BESIII

Collaboration

Mar 6, 2018

13 pages

Published in:

Phys.Rev.D 98 (2018) 3, 032006

Published: Aug 11, 2018

e-Print:

1803.02039 [hep-ex]

DOI:

10.1103/PhysRevD.98.032006

PDG:

{{\mathit \psi}{(2S)}}

\rightarrow

{{\mathit p}}{{\overline{\mathit p}}}

Experiments:

BEPC-BES-III

View in:

ADS Abstract Service

reference search14 citations

Citations per year

Abstract: (APS)

We observe the decay ψ(3686)→nn¯ for the first time and measure ψ(3686)→pp¯ with improved accuracy by using 1.07×108 ψ(3686) events collected with the BESIII detector. The measured branching fractions are B(ψ(3686)→nn¯)=(3.06±0.06±0.14)×10-4 and B(ψ(3686)→pp¯)=(3.05±0.02±0.12)×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+αcos2θ, we determine the α parameters to be αnn¯=0.68±0.12±0.11 and αpp¯=1.03±0.06±0.03 for ψ(3686)→nn¯ and ψ(3686)→pp¯, respectively.

Note:

13 pages, 9 figures

Particle Physics Experiments
electron positron: annihilation
electron positron: colliding beams
psi(3685): electroproduction
psi(3685): hadronic decay
n: pair production
p: pair production
n: angular distribution
p: angular distribution
psi(3685): branching ratio: measured

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