Muslema Pervin

Heavy baryons in a quark model

A quark model is applied to the spectrum of baryons containing heavy quarks. The model gives masses for the known heavy baryons that are in agreement with experiment, but for the doubly-charmed baryon Ξcc, the model prediction is too heavy. Mixing between the ΞQ and Ξ′Q states is examined and is found to be small for the lowest lying states. In contrast with this, mixing between the Ξbc and Ξ′bc states is found to be large, and the implication of this mixing for properties of these states is briefly discussed. We also examine heavy-quark spin-symmetry multiplets, and find that many states in the model can be placed in such multiplets. We compare our predictions with those of a number of other authors.

Strangeness -2 and -3 baryons in a constituent quark model.

We apply a quark model developed in earlier work to the spectrum of baryons with strangeness -2 and -3. The model describes a number of well-established baryons successfully, and application to cascade baryons allows the quantum numbers of some known states to be deduced. [JLAB-THY-07-728].

Quantum Monte Carlo calculations of electroweak transition matrix elements in A = 6, 7 nuclei

Greens function Monte Carlo (GFMC) calculations of magnetic dipole, electric quadrupole, Fermi, and Gamow-Teller transition matrix elements are reported for A=6,7 nuclei. The matrix elements are extrapolated from mixed estimates that bracket the relevant electroweak operator between variational Monte Carlo (VMC) and GFMC propagated wave functions. Because they are off-diagonal terms, two mixed estimates are required for each transition, with a VMC initial (final) state paired with a GFMC final (initial) state. The realistic Argonne v{sub 18} two-nucleon and Illinois-2 three-nucleon interactions are used to generate the nuclear states. In most cases we find good agreement with experimental data.

Quantum Monte Carlo calculations of magnetic moments and M1 transitions in A≤7 nuclei including meson-exchange currents

Greens function Monte Carlo calculations of magnetic moments and

Hyperfine mixing and the semileptonic decays of double-heavy baryons in a quark model

M1

Baryon Spectra and Semileptonic Decay in a Constituent Quark Model

transitions including two-body meson-exchange current (MEC) contributions are reported for

Semileptonic decays of heavy Ω baryons in a quark model

A\leq7

Semileptonic Decays of Heavy Omega Baryons in a Quark Model

nuclei. The realistic Argonne