Observation of the <math display="inline"><msubsup><mi mathvariant="normal">Ξ</mi><mi>b</mi><mo>-</mo></msubsup><mo stretchy="false">→</mo><mrow><mi>ψ</mi><mrow><mo stretchy="false">(</mo><mn>2</mn><mi>S</mi><mo stretchy="false">)</mo></mrow></mrow><msup><mi mathvariant="normal">Ξ</mi><mo>-</mo></msup></math> decay and studies of the <math display="inline"><msub><mi mathvariant="normal">Ξ</mi><mi>b</mi></msub><mo stretchy="false">(</mo><mn>5945</mn><msup><mo stretchy="false">)</mo><mn>0</mn></msup></math> baryon in proton-proton collisions at <math display="inline"><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math>

Benecke, Anna;Bethani, Agni;Bruno, Giacomo;Caputo, Claudio;CMS;et.al.
(2024) Physical review D — Vol. 110 (2024)

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Abstract
The first observation of the decay <math display="inline"><msubsup><mi mathvariant="normal">Ξ</mi><mi>b</mi><mo>-</mo></msubsup><mo stretchy="false">→</mo><mrow><mi>ψ</mi><mrow><mo stretchy="false">(</mo><mn>2</mn><mi>S</mi><mo stretchy="false">)</mo></mrow></mrow><msup><mi mathvariant="normal">Ξ</mi><mo>-</mo></msup></math> and measurement of the branching ratio of <math display="inline"><msubsup><mi mathvariant="normal">Ξ</mi><mi>b</mi><mo>-</mo></msubsup><mo stretchy="false">→</mo><mrow><mi>ψ</mi><mrow><mo stretchy="false">(</mo><mn>2</mn><mi>S</mi><mo stretchy="false">)</mo></mrow></mrow><msup><mi mathvariant="normal">Ξ</mi><mo>-</mo></msup></math> to <math display="inline"><msubsup><mi mathvariant="normal">Ξ</mi><mi>b</mi><mo>-</mo></msubsup><mo stretchy="false">→</mo><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow><msup><mi mathvariant="normal">Ξ</mi><mo>-</mo></msup></math> are presented. The <math display="inline"><mi>J</mi><mo>/</mo><mi>ψ</mi></math> and <math display="inline"><mi>ψ</mi><mrow><mo stretchy="false">(</mo><mn>2</mn><mi>S</mi><mo stretchy="false">)</mo></mrow></math> mesons are reconstructed using their dimuon decay modes. The results are based on proton-proton colliding beam data from the LHC collected by the CMS experiment at <math display="inline"><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math> in 2016–2018, corresponding to an integrated luminosity of <math display="inline"><mn>140</mn><mtext> </mtext><mtext> </mtext><msup><mi>fb</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The branching fraction ratio is measured to be <math display="inline"><mrow><mi mathvariant="script">B</mi><mo stretchy="false">(</mo><mrow><msubsup><mrow><mi mathvariant="normal">Ξ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mo>-</mo></mrow></msubsup><mo stretchy="false">→</mo><mrow><mi>ψ</mi><mrow><mo stretchy="false">(</mo><mn>2</mn><mi>S</mi><mo stretchy="false">)</mo></mrow></mrow><msup><mrow><mi mathvariant="normal">Ξ</mi></mrow><mrow><mo>-</mo></mrow></msup></mrow><mo stretchy="false">)</mo><mo>/</mo><mi mathvariant="script">B</mi><mo stretchy="false">(</mo><mrow><msubsup><mrow><mi mathvariant="normal">Ξ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mo>-</mo></mrow></msubsup><mo stretchy="false">→</mo><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow><msup><mrow><mi mathvariant="normal">Ξ</mi></mrow><mrow><mo>-</mo></mrow></msup></mrow><mo stretchy="false">)</mo><mo>=</mo><mspace linebreak="goodbreak"/><mn>0.8</mn><msubsup><mrow><mn>4</mn></mrow><mrow><mo>-</mo><mn>0.19</mn></mrow><mrow><mo>+</mo><mn>0.21</mn></mrow></msubsup><mrow><mo stretchy="false">(</mo><mi>stat</mi><mo stretchy="false">)</mo></mrow><mo>±</mo><mn>0.10</mn><mrow><mo stretchy="false">(</mo><mi>syst</mi><mo stretchy="false">)</mo></mrow><mo>±</mo><mn>0.02</mn><mo stretchy="false">(</mo><mi mathvariant="script">B</mi><mo stretchy="false">)</mo></mrow></math>, where the last uncertainty comes from the uncertainties in the branching fractions of the charmonium states. New measurements of the <math display="inline"><msub><mi mathvariant="normal">Ξ</mi><mi>b</mi></msub><mo stretchy="false">(</mo><mn>5945</mn><msup><mo stretchy="false">)</mo><mn>0</mn></msup></math> baryon mass and natural width are also presented, using the <math display="inline"><msubsup><mi mathvariant="normal">Ξ</mi><mi>b</mi><mo>-</mo></msubsup><msup><mi>π</mi><mo>+</mo></msup></math> final state, where the <math display="inline"><msubsup><mi mathvariant="normal">Ξ</mi><mi>b</mi><mo>-</mo></msubsup></math> baryon is reconstructed through the decays <math display="inline"><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow><msup><mi mathvariant="normal">Ξ</mi><mo>-</mo></msup></math>, <math display="inline"><mrow><mi>ψ</mi><mrow><mo stretchy="false">(</mo><mn>2</mn><mi>S</mi><mo stretchy="false">)</mo></mrow></mrow><msup><mi mathvariant="normal">Ξ</mi><mo>-</mo></msup></math>, <math display="inline"><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow><mi mathvariant="normal">Λ</mi><msup><mi>K</mi><mo>-</mo></msup></math>, and <math display="inline"><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow><msup><mi mathvariant="normal">Σ</mi><mn>0</mn></msup><msup><mi>K</mi><mo>-</mo></msup></math>. Finally, the fraction of <math display="inline"><msubsup><mi mathvariant="normal">Ξ</mi><mi>b</mi><mo>-</mo></msubsup></math> baryons produced from <math display="inline"><msub><mi mathvariant="normal">Ξ</mi><mi>b</mi></msub><mo stretchy="false">(</mo><mn>5945</mn><msup><mo stretchy="false">)</mo><mn>0</mn></msup></math> decays is determined.
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Benecke, A., Bethani, A., Bruno, G., Caputo, C., Delaere, C., Donertas, I. S., Giammanco, A., Jain, S., Jain, S., Lemaitre, V., Lidrych, J., Mastrapasqua, P., Tran, T. T., Wertz, S., CMS, & et al. (2024). Observation of the <math display=“inline”><msubsup><mi mathvariant=“normal”>Ξ</mi><mi>b</mi><mo>-</mo></msubsup><mo stretchy=“false”>→</mo><mrow><mi>ψ</mi><mrow><mo stretchy=“false”>(</mo><mn>2</mn><mi>S</mi><mo stretchy=“false”>)</mo></mrow></mrow><msup><mi mathvariant=“normal”>Ξ</mi><mo>-</mo></msup></math> decay and studies of the <math display=“inline”><msub><mi mathvariant=“normal”>Ξ</mi><mi>b</mi></msub><mo stretchy=“false”>(</mo><mn>5945</mn><msup><mo stretchy=“false”>)</mo><mn>0</mn></msup></math> baryon in proton-proton collisions at <math display=“inline”><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math>. Physical review D, 110. https://doi.org/10.1103/PhysRevD.110.012002 (Original work published 2024)