Production of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>P</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math> states in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="normal">Λ</mml:mi><mml:mi>b</mml:mi></mml:msub></mml:math> decays
نویسندگان
چکیده
We develop a model for the production of Pc states observed at LHCb in Lambdab - Jpsi p K- decays. With fewer parameters than other approaches, we obtain excellent fits to Jpsi-p invariant mass spectrum, capturing both prominent peaks, and broader features over full range mass. A distinguishing feature our is that whereas Pc(4312), Pc(4380), Pc(4440) are resonances with Sigmac*-D* constituents, nature Pc(4457) quite different, can be understood either as Sigmac-D* threshold cusp, Lambdac(2595)-D enhancement due triangle singularity, or resonance. propose experimental measurements discriminate among these possibilities. Unlike models, mechanism respects isospin symmetry empirical dominance colour-enhanced processes weak decays, additionally gives natural explanation overall shape data. Our consistent constraints from photoproduction Lambdac-D(*)0 decays it does not imply existence partner whose apparent absence experiments unexplained models.
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ژورنال
عنوان ژورنال: Physical review
سال: 2022
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevd.106.054029