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The newly observed Λ b(6072)0 structure and its ρ-mode nonstrange partners

2020/04/28 by Wei Liang, Qi-Fang Lü · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Computer science #Lambda #Mode (computer interface) #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #hep-ex #hep-ph #nucl-th

paper · pdf · doi:10.1140/epjc/s10052-020-8274-2

8 pages, 4 figures, comments and suggestions are welcome

arxiv created 2020/04/28 · openalex created_date 2020/05/13 · openalex publication_date 2020/08/01 · arxiv updated 2020/08/26 · openalex updated_date 2026/08/06

Abstract

Abstract Inspired by the newly observed Λ b(6072) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Λ</mml:mi><mml:mi>b</mml:mi></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mn>6072</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math> structure, we investigate its strong decay behaviors under various assignments within the 3P0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mrow /><mml:mn>3</mml:mn></mml:msup><mml:msub><mml:mi>P</mml:mi><mml:mn>0</mml:mn></mml:msub></mml:mrow></mml:math> model. Compared with the mass and total decay width, our results suggest that the Λ b(6072) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Λ</mml:mi><mml:mi>b</mml:mi></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mn>6072</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math> can be regarded as the lowest ρ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>ρ</mml:mi></mml:math> -mode excitation in Λ b <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>Λ</mml:mi><mml:mi>b</mml:mi></mml:msub></mml:math> family. Then, the strong decays of ρ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>ρ</mml:mi></mml:math> -mode nonstrange partners for the Λ b(6072) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Λ</mml:mi><mml:mi>b</mml:mi></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mn>6072</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math> are calculated. It is found that the JP=5/2- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mi>J</mml:mi><mml:mi>P</mml:mi></mml:msup><mml:mo>=</mml:mo><mml:mn>5</mml:mn><mml:mo>/</mml:mo><mml:msup><mml:mn>2</mml:mn><mml:mo>-</mml:mo></mml:msup></mml:mrow></mml:math> Λ b <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>Λ</mml:mi><mml:mi>b</mml:mi></mml:msub></mml:math> and Λ c <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math> states are relatively narrow, and mainly decay into the Σ b(*) π <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msubsup><mml:mi>Σ</mml:mi><mml:mi>b</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mrow /><mml:mo>∗</mml:mo><mml:mo>)</mml:mo></mml:mrow></mml:msubsup><mml:mi>π</mml:mi></mml:mrow></mml:math> and Σ c(*) π <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msubsup><mml:mi>Σ</mml:mi><mml:mi>c</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mrow /><mml:mo>∗</mml:mo><mml:mo>)</mml:mo></mml:mrow></mml:msubsup><mml:mi>π</mml:mi></mml:mrow></mml:math> final states, respectively. These two states have good potentials to be observed in future experiments, which may help us to distinguish the three-quark model and diquark model.

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