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Measurements of the absolute branching fractions for D-s(+) -> eta e(+)nu(e) and D-s(+) -> eta ' e(+)nu(e)
RAS, BINP, SB, GI Budker Inst Nucl Phys, Novosibirsk 630090, Russia.;Novosibirsk State Univ, Novosibirsk 630090, Russia..
Helmholtz Inst Mainz, Johann Joachim Becher Weg 45, D-55099 Mainz, Germany..
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2016 (English)In: PHYSICAL REVIEW D, ISSN 2470-0010, Vol. 94, no 11, article id 112003Article in journal (Refereed) Published
Abstract [en]

By analyzing 482 pb(-1) of e(+)e(-) collision data collected at root s = 4.009 GeV with the BESIII detector at the BEPCII collider, we measure the absolute branching fractions for the semileptonic decays D-s(+) -> eta e(+)nu(e) and D-s(+) -> eta ' e(+)nu(e) to be B(D-s(+) -> eta e(+)nu(e)) = (2.30 +/- 0.31 +/- 0.08)% and B(D-s(+) -> eta ' e(+)nu(e)) = (0.93 +/- 0.30 +/- 0.05)%, respectively, and their ratio B(D-s(+) -> eta ' e(+)nu(e)) / B(D-s(+) -> eta ' e(+)nu(e)) = 0.40 +/- 0.14 +/- 0.02, where the first uncertainties are statistical and the second ones are systematic. The results are in good agreement with previous measurements within uncertainties; they can be used to determine the eta-eta' mixing angle and improve upon the D-s(+) semileptonic branching ratio precision.

Place, publisher, year, edition, pages
2016. Vol. 94, no 11, article id 112003
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-312039DOI: 10.1103/PhysRevD.94.112003ISI: 000389505100001OAI: oai:DiVA.org:uu-312039DiVA, id: diva2:1062786
Available from: 2017-01-08 Created: 2017-01-04 Last updated: 2017-01-08Bibliographically approved

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Andersson, Walter IkegamiJohansson, TordKupsc, AndrzejLi, CuiPettersson, JoachimSchönning, KarinWolke, Magnus

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