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Decay widths and mass spectra of single bottom baryons

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arxiv 2307.00505 v1 pith:7AWAWC7D submitted 2023-07-02 hep-ph

classification hep-ph
keywords decaybottombaryonswidthsmodelstatesmasssingle
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We develop a Hamiltonian model that incorporates the spin, spin-orbit, and isospin interactions to determine the masses of the ground states of single-bottom baryons and their excitations up to the $D$-wave. Furthermore, we calculate the strong decay widths of single-bottom baryons using the $^3P_0$ model. Our calculations consider final states comprising bottom baryon-(vector/pseudoscalar) meson pairs and (octet/decuplet) baryon-(pseudoscalar/vector) bottom meson pairs within a constituent quark model. In that respect, this is the most complete investigation which has ever been performed in the single bottom baryon sector so far. Additionally, we compute the electromagnetic decay widths from $P$-wave states to ground states. The electromagnetic decays become dominant in cases where the strong decays are suppressed. The experimental uncertainties are propagated to the model parameters using a Monte Carlo bootstrap method. Our quantum number assignments, as well as our mass and strong decay width predictions, are in reasonable agreement with the available data. We also provide the partial decay widths for each open flavor channel. Our predictions of mass spectra and decay widths provide valuable information for the experiments seeking to identify new bottom baryons and knowledge of possible decay channels can aid in their identification in the data. Therefore, our results will be able to guide future searches for the undiscovered single bottom baryons at LHCb, ATLAS, and CMS.

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  1. Chiral effective theory of scalar and vector diquarks revisited

    hep-ph 2024-11 conditional novelty 5.0 of 10

    A new term in the chiral diquark Lagrangian is shown to control the mass ordering of pseudoscalar diquarks and to set the threshold at which heavy-baryon decays turn off under chiral restoration.

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