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Study of e(+)e(-) -> p(p)over-bar in the vicinity of psi(3770)
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2014 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 735, 101-107 p.Article in journal (Refereed) Published
Abstract [en]

Using 2917 pb(-1) of data accumulated at 3.773 GeV, 44.5 pb(-1) of data accumulated at 3.65 GeV and data accumulated during a psi(3770) line-shape scan with the BESIII detector, the reaction e(+)e(-) -> p (p) over bar is studied considering a possible interference between resonant and continuum amplitudes. The cross section of e(+)e(-) -> psi(3770) -> p (p) over bar, sigma(e(+)e(-)-> psi(3770) -> p (p) over bar), is found to have two solutions, determined to be (0.059(-0.020)(+0.070) +/- 0.012) pb with the phase angle phi = (255.8(-26.6)(+39.0) +/- 4.8). (< 0.166 pb at the 90% confidence level), or sigma(e(+)e(-) -> psi(3770) -> p<(p)over bar>) = (2.57(-0.13)(+0.12) +/- 0.12) pb with phi = (266.9(-6.3)(+6.1) +/- 0.9)degrees both of which agree with a destructive interference. Using the obtained cross section of psi(3770) -> p (p) over bar, the cross section of p (p) over bar -> psi(3770), which is useful information for the future PANDA experiment, is estimated to be either (9.8(-3.9)(+11.8)) nb (< 27.5 nb at 90% C.L.) or (425.6(-43.7)(+42.9)) nb. (C) 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.

Place, publisher, year, edition, pages
2014. Vol. 735, 101-107 p.
Keyword [en]
BESIII, Charmonium decay, Proton form factor
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-231292DOI: 10.1016/j.physletb.2014.06.013ISI: 000340048900018OAI: oai:DiVA.org:uu-231292DiVA: diva2:744503
Available from: 2014-09-08 Created: 2014-09-07 Last updated: 2014-09-08Bibliographically approved

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Johansson, TordKupsc, Andrzej
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