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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/131515
Measurements of B(¯¯¯B0→Λ+c¯p) and B(B−→Λ+c¯pπ−) and studies of Λ+cπ− resonances
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We present an investigation of the decays ¯¯¯ B 0 → Λ + c ¯ p and B − → Λ + c ¯ p π − based on 383 × 10 6 Υ ( 4 S ) → B ¯¯¯ B decays recorded with the BABAR detector. We measure the branching fractions of these decays; their ratio is B ( B − → Λ + c ¯ p π − ) / B ( ¯¯¯ B 0 → Λ + c ¯ p ) = 15.4 ± 1.8 ± 0.3 . The B − → Λ + c ¯ p π − process exhibits an enhancement at the Λ + c ¯ p threshold and is a laboratory for searches for excited charm baryon states. We observe the resonant decays B − → Σ c ( 2455 ) 0 ¯ p and B − → Σ c ( 2800 ) 0 ¯ p but see no evidence for B − → Σ c ( 2520 ) 0 ¯ p . This is the first observation of the decay B − → Σ c ( 2800 ) 0 ¯ p ; however, the mass of the observed excited Σ 0 c state is ( 2846 ± 8 ± 10 ) MeV / c 2 , which is somewhat inconsistent with previous measurements. Finally, we examine the angular distribution of the B − → Σ c ( 2455 ) 0 ¯ p decays and measure the spin of the Σ c ( 2455 ) 0 baryon to be 1 / 2 , as predicted by the quark model.
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GARRA TICÓ, Jordi, GRAUGÉS POUS, Eugeni, BABAR Collaboration. Measurements of B(¯¯¯B0→Λ+c¯p) and B(B−→Λ+c¯pπ−) and studies of Λ+cπ− resonances. _Physical Review D_. 2008. Vol. 78, núm. 11, pàgs. 112003. [consulta: 24 de gener de 2026]. ISSN: 1550-7998. [Disponible a: https://hdl.handle.net/2445/131515]