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Evidence for the singly Cabibbo suppressed decay Λc+ →pη and search for Λc+ →pπ0 M. Ablikim, M. N. Achasov, S. Ahmed [et al.]

Contributor(s): Achasov, M. N | Ahmed, S | Chelkov, G. A | Ablikim, MMaterial type: ArticleArticleSubject(s): BESIII, детектор | BEPCII, коллайдер | Каббибо подавленные распадыGenre/Form: статьи в журналах Online resources: Click here to access online In: Physical Review D Vol. 95, № 11. P. 111102-1-111102-8Abstract: We study the singly Cabibbo suppressed decays Λ+c→pη and Λ+c→pπ0 using Λ+c¯Λ−c pairs produced by e+e− collisions at a center-of-mass energy of √s=4.6 GeV. The data sample was collected by the BESIII detector at the BEPCII collider and corresponds to an integrated luminosity of 567 pb−1. We find the first evidence for the decay Λ+c→pη with a statistical significance of 4.2 σ and measure its branching fraction to be B(Λ+c→pη=(1.24± 0.28(stat)±0.10(syst))×10−3. No significant Λ+c→pπ0 signal is observed. We set an upper limit on its branching fraction B(Λ+c→pπ0)<2.7×10−4 at the 90% confidence level.
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We study the singly Cabibbo suppressed decays Λ+c→pη and Λ+c→pπ0 using Λ+c¯Λ−c pairs produced by e+e− collisions at a center-of-mass energy of √s=4.6 GeV. The data sample was collected by the BESIII detector at the BEPCII collider and corresponds to an integrated luminosity of 567 pb−1. We find the first evidence for the decay Λ+c→pη with a statistical significance of 4.2 σ and measure its branching fraction to be B(Λ+c→pη=(1.24± 0.28(stat)±0.10(syst))×10−3. No significant Λ+c→pπ0 signal is observed. We set an upper limit on its branching fraction B(Λ+c→pπ0)<2.7×10−4 at the 90% confidence level.

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