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Evidence for the decays of and *
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Zeitschriftentitel: | Chinese Physics C |
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Personen und Körperschaften: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
In: | Chinese Physics C, 43, 2019, 8, S. 083002 |
Medientyp: | E-Article |
Sprache: | Unbestimmt |
veröffentlicht: |
IOP Publishing
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Schlagwörter: |
Zusammenfassung: | <jats:title>Abstract</jats:title> <jats:p>We study the hadronic decays of <jats:inline-formula> <jats:tex-math><?CDATA $ \Lambda_{c}^{+} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M3.jpg" xlink:type="simple" /> </jats:inline-formula> to the final states <jats:inline-formula> <jats:tex-math><?CDATA $ \Sigma^{+}\eta $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M4.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ \Sigma^+\eta^\prime $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M5.jpg" xlink:type="simple" /> </jats:inline-formula>, using an <jats:inline-formula> <jats:tex-math><?CDATA $ e^+e^- $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M6.jpg" xlink:type="simple" /> </jats:inline-formula> annihilation data sample of 567 pb<jats:sup>-1</jats:sup> taken at a center-of-mass energy of 4.6 GeV with the BESIII detector at the BEPCII collider. We find evidence for the decays <jats:inline-formula> <jats:tex-math><?CDATA $ \Lambda_{c}^{+}\rightarrow\Sigma^{+}\eta $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M7.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ \Sigma^+\eta^\prime $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M8.jpg" xlink:type="simple" /> </jats:inline-formula> with statistical significance of <jats:inline-formula> <jats:tex-math><?CDATA $ 2.5\sigma $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M9.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ 3.2\sigma $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M10.jpg" xlink:type="simple" /> </jats:inline-formula>, respectively. Normalizing to the reference decays <jats:inline-formula> <jats:tex-math><?CDATA $ \Lambda_c^+\to\Sigma^+\pi^0 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M11.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ \Sigma^+\omega $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M12.jpg" xlink:type="simple" /> </jats:inline-formula>, we obtain the ratios of the branching fractions <jats:inline-formula> <jats:tex-math><?CDATA $ \displaystyle\frac{{\mathcal B}(\Lambda_c^+\to\Sigma^+\eta)}{{\mathcal B}(\Lambda_c^+\to\Sigma^+\pi^0)} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M13.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ \displaystyle\frac{{\mathcal B}(\Lambda_c^+\to\Sigma^+\eta^\prime)}{{\mathcal B}(\Lambda_c^+\to\Sigma^+\omega)} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M14.jpg" xlink:type="simple" /> </jats:inline-formula> to be <jats:inline-formula> <jats:tex-math><?CDATA $ 0.35 \pm 0.16 \pm 0.02 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M15.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ 0.86 \pm 0.34 \pm 0.04 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M16.jpg" xlink:type="simple" /> </jats:inline-formula>, respectively. The upper limits at the 90% confidence level are set to be <jats:inline-formula> <jats:tex-math><?CDATA $ \displaystyle\frac{{\mathcal B}(\Lambda_c^+\to\Sigma^+\eta)}{{\mathcal B}(\Lambda_c^+\to\Sigma^+\pi^0)} \lt 0.58 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M17.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ \displaystyle\frac{{\mathcal B}(\Lambda_c^+\to\Sigma^+\eta^\prime)}{{\mathcal B}(\Lambda_c^+\to\Sigma^+\omega)} \lt 1.2 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M18.jpg" xlink:type="simple" /> </jats:inline-formula>. Using BESIII measurements of the branching fractions of the reference decays, we determine <jats:inline-formula> <jats:tex-math><?CDATA $ \mathcal{B}({\Lambda_{c}^{+}\rightarrow\Sigma^{+}\eta}) = (0.41\pm0.19\pm0.05) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M19.jpg" xlink:type="simple" /> </jats:inline-formula>% (<0.68%) and <jats:inline-formula> <jats:tex-math><?CDATA $ \mathcal{B}({\Lambda_{c}^{+}\rightarrow\Sigma^{+}\eta'}) = (1.34\pm0.53\pm0.19) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M20.jpg" xlink:type="simple" /> </jats:inline-formula>% (<1.9%). Here, the first uncertainties are statistical and the second systematic. The obtained branching fraction of <jats:inline-formula> <jats:tex-math><?CDATA $ \Lambda_c^+\to\Sigma^+\eta $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M21.jpg" xlink:type="simple" /> </jats:inline-formula> is consistent with the previous measurement, and the branching fraction of <jats:inline-formula> <jats:tex-math><?CDATA $ \Lambda_{c}^{+}\rightarrow\Sigma^{+}\eta^{\prime} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083002_M22.jpg" xlink:type="simple" /> </jats:inline-formula> is measured for the first time. </jats:p> |
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Umfang: | 083002 |
ISSN: |
1674-1137
2058-6132 |
DOI: | 10.1088/1674-1137/43/8/083002 |