Abstract
Using a data sample of 980 fb−1 collected with the Belle detector at the KEKB asymmetric-energy e+e− collider, we study the processes of {Xi}_c^0to Lambda {overline{K}}^{ast 0} , {Xi}_c^0to {Sigma}^0{overline{K}}^{ast 0} , and {Xi}_c^0to {Sigma}^{+}{K}^{ast -} for the first time. The relative branching ratios to the normalization mode of {Xi}_c^0to {Xi}^{-}{pi}^{+} are measured to beBΞc0→ΛK¯∗0/BΞc0→Ξ−π+=0.18±0.02stat.±0.01syst.,BΞc0→Σ0K¯∗0/BΞc0→Ξ−π+=0.69±0.03stat.±0.03syst.,BΞc0→Σ+K∗−/BΞc0→Ξ−π+=0.34±0.06stat.±0.02syst.,\\documentclass[12pt]{minimal}\t\t\t\t\\usepackage{amsmath}\t\t\t\t\\usepackage{wasysym}\t\t\t\t\\usepackage{amsfonts}\t\t\t\t\\usepackage{amssymb}\t\t\t\t\\usepackage{amsbsy}\t\t\t\t\\usepackage{mathrsfs}\t\t\t\t\\usepackage{upgreek}\t\t\t\t\\setlength{\\oddsidemargin}{-69pt}\t\t\t\t\\begin{document}$$ {\\displaystyle \\begin{array}{c}\\mathcal{B}\\left({\\Xi}_c^0\\to \\Lambda {\\overline{K}}^{\\ast 0}\\right)/\\mathcal{B}\\left({\\Xi}_c^0\\to {\\Xi}^{-}{\\pi}^{+}\\right)=0.18\\pm 0.02\\left(\\mathrm{stat}.\\right)\\pm 0.01\\left(\\mathrm{syst}.\\right),\\\\ {}\\mathcal{B}\\left({\\Xi}_c^0\\to {\\Sigma}^0{\\overline{K}}^{\\ast 0}\\right)/\\mathcal{B}\\left({\\Xi}_c^0\\to {\\Xi}^{-}{\\pi}^{+}\\right)=0.69\\pm 0.03\\left(\\mathrm{stat}.\\right)\\pm 0.03\\left(\\mathrm{syst}.\\right),\\\\ {}\\mathcal{B}\\left({\\Xi}_c^0\\to {\\Sigma}^{+}{K}^{\\ast -}\\right)/\\mathcal{B}\\left({\\Xi}_c^0\\to {\\Xi}^{-}{\\pi}^{+}\\right)=0.34\\pm 0.06\\left(\\mathrm{stat}.\\right)\\pm 0.02\\left(\\mathrm{syst}.\\right),\\end{array}} $$\\end{document}where the uncertainties are statistical and systematic, respectively. We obtainBΞc0→ΛK¯∗0=3.3±0.3stat.±0.2syst.±1.0ref.×10−3,BΞc0→Σ0K¯∗0=12.4±0.5stat.±0.5syst.±3.6ref.×10−3,BΞc0→Σ+K∗0=6.1±1.0stat.±0.4syst.±1.8ref.×10−3,\\documentclass[12pt]{minimal}\t\t\t\t\\usepackage{amsmath}\t\t\t\t\\usepackage{wasysym}\t\t\t\t\\usepackage{amsfonts}\t\t\t\t\\usepackage{amssymb}\t\t\t\t\\usepackage{amsbsy}\t\t\t\t\\usepackage{mathrsfs}\t\t\t\t\\usepackage{upgreek}\t\t\t\t\\setlength{\\oddsidemargin}{-69pt}\t\t\t\t\\begin{document}$$ {\\displaystyle \\begin{array}{c}\\mathcal{B}\\left({\\Xi}_c^0\\to \\Lambda {\\overline{K}}^{\\ast 0}\\right)=\\left(3.3\\pm 0.3\\left(\\mathrm{stat}.\\right)\\pm 0.2\\left(\\mathrm{syst}.\\right)\\pm 1.0\\left(\\mathrm{ref}.\\right)\\right)\\times {10}^{-3},\\\\ {}\\mathcal{B}\\left({\\Xi}_c^0\\to {\\Sigma}^0{\\overline{K}}^{\\ast 0}\\right)=\\left(12.4\\pm 0.5\\left(\\mathrm{stat}.\\right)\\pm 0.5\\left(\\mathrm{syst}.\\right)\\pm 3.6\\left(\\mathrm{ref}.\\right)\\right)\\times {10}^{-3},\\\\ {}\\mathcal{B}\\left({\\Xi}_c^0\\to {\\Sigma}^{+}{K}^{\\ast 0}\\right)=\\left(6.1\\pm 1.0\\left(\\mathrm{stat}.\\right)\\pm 0.4\\left(\\mathrm{syst}.\\right)\\pm 1.8\\left(\\mathrm{ref}.\\right)\\right)\\times {10}^{-3},\\end{array}} $$\\end{document}where the uncertainties are statistical, systematic, and from mathcal{B}left({Xi}_c^0to {Xi}^{-}{pi}^{+}right) , respectively. The asymmetry parameters alpha left({Xi}_c^0to Lambda {overline{K}}^{ast 0}right) and alpha left({Xi}_c^0to {Sigma}^{+}{K}^{ast -}right) are 0.15 ± 0.22(stat.) ± 0.04(syst.) and −0.52 ± 0.30(stat.) ± 0.02(syst.), respectively, where the uncertainties are statistical followed by systematic.
Highlights
Measurements of branching fractions and asymmetry parameters of Ξ0c → ΛK ∗0, Ξ0c → Σ0K ∗0, and
In the ΛK ∗0, Σ0 K ∗0, and Σ+ K ∗− invariant mass spectra, no peaking background is found from combinatorial backgrounds of Λ, Σ0, and Σ+ candidates, but we found a fraction of Ξ0c signal events from the events outside of the K ∗0 and K ∗− signal regions, especially in the higher side of M (K − π + ) and M (KS0 π − ), as shown in figure 2
We measure for the first time the branching fractions and asymmetry parameters of
Summary
Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, Karlsruhe, Germany. Korea Institute of Science and Technology Information, Daejeon 34141, South Korea. P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russian Federation. Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia. Faculty of Chemistry and Chemical Engineering, University of Maribor, 2000 Maribor, Slovenia. University of Mississippi, University, MS 38677, U.S.A
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