Baryons with two heavy quarks: Masses, production, decays, and detection

2014/08/31 by Marek Karliner, Jonathan L. Rosner · 277 citations
Physics and Astronomy · #Baryon #Bottom quark #High-Energy Particle Collisions Research #Nuclear physics #Omega baryon #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Quantum Chromodynamics and Particle Interactions #Quark #Top quark #hep-ex #hep-ph

paper · pdf · doi:10.1103/physrevd.90.094007

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 90(9) (American Physical Society) · 29 pages, no figures. More text and references added. To be published in Phys. Rev. D

arxiv created 2014/10/06 · openalex publication_date 2014/11/10 · arxiv updated 2014/11/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

The large number of B_c mesons observed by LHCb suggests a sizable cross section for producing doubly heavy baryons in the same experiment. Motivated by this, we estimate masses of the doubly heavy J=1/2 baryons \mathrm\ensuremathΞ_cc, \mathrm\ensuremathΞ_bb, and \mathrm\ensuremathΞ_bc, and their J=3/2 hyperfine partners, using a method which accurately predicts the masses of ground-state baryons with a single heavy quark. We obtain M(\mathrm\ensuremathΞ_cc)=3627\ifmmode±\else\textpm\fi12 MeV, M(\mathrm\ensuremathΞ_cc^*)=3690\ifmmode±\else\textpm\fi12 MeV, M(\mathrm\ensuremathΞ_bb)=10162\ifmmode±\else\textpm\fi12 MeV, M(\mathrm\ensuremathΞ_bb^*)=10184\ifmmode±\else\textpm\fi12 MeV, M(\mathrm\ensuremathΞ_bc)=6914\ifmmode±\else\textpm\fi\phantom\rule0ex0ex13 MeV, M(\mathrm\ensuremathΞ^\ensuremath'_bc)=6933\ifmmode±\else\textpm\fi12 MeV, and M(\mathrm\ensuremathΞ_bc^*)=6969\ifmmode±\else\textpm\fi14 MeV. As a byproduct, we estimate the hyperfine splitting between B_c^* and B_c mesons to be 68\ifmmode±\else\textpm\fi8 MeV. We discuss P-wave excitations, production mechanisms, decay modes, lifetimes, and prospects for detection of the doubly heavy baryons.

Citations

• Measurement of theΛb0,Ξb−, andΩb−Baryon Masses
• Review of Particle Physics
• Predictions for masses of Xi_b baryons
• Doubly charmed baryon production in hadronic experiments
• The new Σb multiplet, heavy baryon mass predictions, meson–baryon universality and effective supersymmetry in hadron spectrum
• Factorization approach for inclusive production of doubly heavy baryon
• Mass sum rules for heavy-flavored hadrons
• Search for doubly charmed baryonsΞcc+andΞcc++inBABAR
• Doubly heavy baryons in QCD sum rules
• Charmed bottom baryon spectroscopy from lattice QCD
• Observation of a new Xi(b) baryon
• Charmed baryons in a relativistic quark model
• Static properties and semileptonic decays of doubly heavy baryons in a nonrelativistic quark model
• Mass spectra of doubly heavy baryons in the relativistic quark model
• Confirmation of the doubly charmed baryon Ξcc+(3520) via its decay to pD+K−
• On the production properties of the Doubly-Charmed Baryons
• Static properties and semileptonic decays of doubly heavy baryons in a nonrelativistic quark model

Cited by

• Semileptonic decays of doubly charmed or bottom baryons to single heavy baryons
• Charmed bottom baryon spectroscopy from lattice QCD
• Production of exotic tetraquarks QQq¯q¯ in heavy-ion collisions at the LHC
• Observation of the doubly-charmed-baryon decay \it Ξ_cc⁺⁺→\it Ξ_c⁰π⁺π⁺