[en] Using data collected by the CLEO detector in the Υ(4S) region, we report new measurements of the exclusive decays of B mesons into final states of the type Λ_c⁺p-barn(π), where n=0,1,2,3. We find signals in modes with one, two and three pions and an upper limit for the two-body decay Λ_c⁺p-bar. We also make the first measurements of exclusive decays of B mesons to Σ_cp-barn(π), where n=0,1,2. We find signals in modes with one and two pions and an upper limit for the two-body decay Σ_cp-bar. Measurements of these modes shed light on the mechanisms involved in B decays to baryons

No abstract available

[en] In this article, we study the (1)/(2)^- and (3)/(2)^- heavy and doubly heavy baryon states Σ_Q((1)/(2)^-), Ξ'_Q((1)/(2)^-), Ω_Q((1)/(2)^-), Ξ_QQ((1)/(2)^-), Ω_QQ((1)/(2)^-), Σ_Q^*((3)/(2)^-), Ξ_Q^*((3)/(2)^-), Ω_Q^*((3)/(2)^-), Ξ_QQ^*((3)/(2)^-) and Ω_QQ^*((3)/(2)^-) by subtracting the contributions from the corresponding (1)/(2)⁺ and (3)/(2)⁺ heavy and doubly heavy baryon states with the QCD sum rules in a systematic way, and make reasonable predictions for their masses. (orig.)

[en] I discuss the experimental evidence for and theoretical interpretation of the new mesons and baryons with two heavy quarks. These include doubly-heavy baryons, exotic hadronic quarkonia and most recently a manifestly exotic pentaquark-like doubly heavy baryon with a minimal quark content uudc̄ discovered by LHCb, whose mass, decay mode and width are in agreement with a prediction based on a physical picture of a deuteron-like Σ_c D̄"* “hadronic molecule”.

[en] Based on data collected at the Υ(4s) resonance with the CLEO II detector operating at the Cornell Electron Storage Ring, the authors search for exclusive decays on the B meson to final states containing baryons. Exclusive reconstruction of B mesons is essential in understanding the mechanism for baryon production in B decays. Last year they observed the decay bar B⁰→Λ_c⁺bar pπ⁺π^-. They continue their search for exclusive B meson decays of the form bar B→Σ_c bar p(nπ) and bar B→p bar p(nπ) where n=0, 1, 2, and 3 pions

[en] Combined cross section times branching fraction limits are given for Σ_c⁺⁺ → Λ_c⁺π⁺ and Σ_c⁰ → Λ_c⁺π^- where Λ_c⁺ → Σ_s^±π^±π⁺. The Λ_c⁺ is reconstructed with partial information on the Σ_s; the missing Σ_s momentum is established through momentum conservation imposed by a constrained fit. The data are of π^- beam interactions at 250 GeV from Fermilab experiment E769

[en] Charmed (and bottom) hypernuclei are studied in the quark-meson coupling (QMC) model. This completes systematic studies of charmed (Λ⁺_c, Σ_c, Ξ_c), and Λ_b hypernuclei in the QMC model. Effects of the Pauli blocking due to the underlying quark structure of baryons, and the Σ_cN-Λ_cN channel coupling are phenomenologically taken into account at the hadronic level in the same way as those included for strange hypernuclei. Our results suggest that the Σ⁺⁺_c and Ξ⁺_c hypernuclei are very unlikely to be formed, while the Λ⁺_c, Ξ⁰_c and Λ_b hypernuclei are quite likely to be formed. For the Σ⁺_c hypernuclei, the formation probability is non-zero, though small. A detailed analysis is also made about the phenomenologically introduced Pauli blocking and channel coupling effects for the Σ⁰_c hypernuclei

[en] Using data recorded by the CLEO-II detector at CESR, we report evidence of a pair of excited charmed baryons, one decaying into Λ_c⁺ π⁺ and the other into Λ_c⁺π^-. The doubly charged state has a measured mass difference M(Λ_c⁺ π⁺) - M(Λ_c⁺) of 234.5 ± 1.1 ± 0.8 MeV and a width of 17.9_-3.2^+3.8 ± 4.0 MeV, and the neutral state has a measured mass difference M(Λ_c⁺π^-) - M(Λ_c⁺) of 232.6 ± 1.0 ± 0.8 MeV and a width of 13.0_-3.0^+3.7 ± 4.0 MeV. We identify these states as Σ*_c⁺⁺ and Σ*_c⁰, the spin 3/2⁺ excitations of the Σ_c baryons

[en] We discuss the isospin-breaking mass differences among baryons, with particular attention in the charm sector to the Σ_c⁺-Σ_c⁰, Σ_c⁺⁺-Σ_c⁰, and Ξ_c⁺-Ξ_c⁰ splittings. Simple potential models cannot accommodate the trend of the available data on charm baryons. More precise measurements would offer the possibility of testing how well potential models describe the non-perturbative limit of QCD

[en] We give the explicit wave functions of the qqqqq-bar components of the C=+1, J=1/2 charmed baryons, Σ_c, Λ_c and Ξ_c^a, and calculate the magnetic moments by adding the 5q components contributions, and we also compute the magnetic moments of the Σ_b and Σ_b* baryons. The influence of the additional light and strange qq-bar pairs is investigated. As we know, the constituent quark masses of the charm and beauty quarks are much heavier than that of the light and strange quarks, consequently, the hidden flavor contributions to the baryons magnetic moments may be significant. What is interesting is that the inclusion of the qqqqq-bar components contributions leads to different Λ_c⁺, Ξ_c^a+ and Ξ_c^a0 magnetic moments, all of which are predicted to be the same value 0.38μ_N on the basis of the classical qqq quark model. And it is shown that the differences of these magnetic moments are independent of the constituent mass of the charm quark