Semileptonic Decays of Heavy Lambda Baryons in a Quark Model (2005)
Pervin, Muslema, Roberts, Winston, Capstick, Simon
The semileptonic decays of Lambda_c and Lambda_b are treated in the framework of a constituent quark model. Both nonrelativistic and semirelativistic Hamiltonians are used to obtain the baryon wave...
Model Dependence of the Properties of S11 Baryon Resonances (2003)
Kiswandhi, Alvin, Capstick, Simon, Dytman, Steven
The properties of baryon resonances are extracted from a complicated process of fitting sophisticated, empirical models to data. The reliability of this process comes from the quality of data and the...
Interpretation of the Theta+ as an isotensor pentaquark with weakly decaying partners (2003)
Capstick, Simon, Page, Philip R., Roberts, Winston
The Theta+(1540), recently observed at LEPS, DIANA and CLAS, is hypothesized to be an isotensor resonance. This implies the existence of a multiplet where the Theta++, Theta+ and Theta0 have...
Using pi_2(1670) -> b_1(1235) pi to Constrain Hadronic Models (2003)
Page, Philip R., Capstick, Simon
We show that current analyses of experimental data indicate that the strong decay mode pi_2 -> b_1 pi is anomalously small. Non-relativistic quark models with spin-1 quark pair creation, such as...
Hybrid and Conventional Baryons in the Flux-Tube Model (2002)
Capstick, Simon, Page, Philip R.
Conventional and hybrid light quark baryons are constructed in the non-relativistic flux-tube model of Isgur and Paton, which is motivated by lattice QCD. The motion of the flux tube with the three...
Baryon-Meson Loop Effects on the Spectrum of Non Strange Baryons (2002)
Morel, Danielle, Capstick, Simon
Corrections to the masses of baryons from baryon-meson loops can induce splittings between baryons which are comparable to those arising from the residual interactions between the quarks. These...
Key Issues in Hadronic Physics (2000)
Capstick, Simon, Dytman, Steven, Holt, Roy, Ji, Xiangdong, Negele, John, Swanson, Eric
A group of fifty physicists met in Duck, NC, Nov. 6-9 to discuss the current status and future goals of hadronic physics. The main purpose of the meeting was to define the field by identifying its...
Quark Models of Baryon Masses and Decays (2000)
The description of baryon resonance masses and decays in the constituent quark model is outlined, with emphasis on the potential-model approach combined with the 3P0 pair-creation model of strong...
Quark Models of Baryon Masses and Decays (2000)
The application of quark models to the spectra and strong and electromagnetic couplings of baryons is reviewed. This review focuses on calculations which attempt a global description of the masses...
Key issues in hadronic physics (2000)
Capstick, Simon, Dytman, Steven, Holt, Roy, Ji, Xiang-dong, Negele, John, Swanson, Eric, ...
Meson-loop contributions to the rho-omega mass splitting & rho charge radius (1999)
Pichowsky, M. A., Walawalkar, Sameer, Capstick, Simon
Contributions of two-pseudoscalar and vector-pseudoscalar meson loops to the rho-omega mass splitting are evaluated in a covariant model based on studies of the Schwinger-Dyson equations of QCD. The...
Constructing Hybrid Baryons with Flux Tubes (1999)
Capstick, Simon, Page, Philip R.
Hybrid baryon states are described in quark potential models as having explicit excitation of the gluon degrees of freedom. Such states are described in a model motivated by the strong coupling limit...
Evidence for the fourth P11 resonance predicted by the constituent quark model (1999)
Capstick, Simon, Lee, T. -S. H., Roberts, W., Svarc, A.
It is pointed out that the third of five low-lying P11 states predicted by a constituent quark model can be identified with the third of four states in a solution from a three-channel analysis by the...
Delta isobar masses, large N_c relations, and the quark model (1998)
Motivated by recent remarks on the Delta+ mass and comparisons between the quark model and relations based on large-N_c with perturbative flavor breaking, two sets of Delta masses consistent with...
Strange Decays of Nonstrange Baryons (1998)
The strong decays of excited nonstrange baryons into the final states Lambda K, Sigma K, and for the first time into Lambda(1405) K, Lambda(1520) K, Sigma(1385) K, Lambda K*, and Sigma K*, are...
Pion Cloud Contributions to the Proton's Weak Magnetic Form Factor (1997)
We report on the contributions to the nucleon weak magnetic and electric form factors arising from isospin-breaking form factors. The relativized quark model used in the calculations includes isospin...
The decays of excited nonstrange baryons into the final states Deltaj and Delta! are examined in a relativized quark pair creation model. The wavefunctions and parameters of the model are fixed by...
Pion Cloud Contributions to the Proton's Weak Magnetic Form Factor (1997)
We report on the contributions to the nucleon weak magnetic and electric form factors arising from isospin-breaking form factors. The relativized quark model used in the calculations includes isospin...
New Baryons in the Delta eta and Delta omega Channels (1997)
The decays of excited nonstrange baryons into the final states Delta eta and Delta omega are examined in a relativized quark pair creation model. The wavefunctions and parameters of the model are...
Baryon Current Matrix Elements in a Relativistic Quark Model (1997)
Capstick, Simon, Keister, B. D.
Current matrix elements and observables for electro- and photo-excitation of baryons from the nucleon are studied in a light-front framework. Relativistic effects are examined by comparison to a...
Baryon Magnetic Moments in a Relativistic Quark Model (1996)
Capstick, Simon, Keister, B. D.
Magnetic moments of baryons in the ground-state octet and decuplet are calculated in a light-front framework. We investigate the effects of quark mass variation both in the current operator and in...
Baryon Current Matrix Elements in a Light-Front Framework (1994)
Capstick, Simon, Keister, B. D.
Current matrix elements and observables for electro- and photo-excitation of baryons from the nucleon are studied in a light-front framework. Relativistic effects are estimated by comparison to a...
Quasi-Two-Body Decays of Nonstrange Baryons (1993)
Capstick, Simon, Roberts, Winston
We examine the decays of nonstrange baryons to the final states $\Delta\pi$, $N\rho$, $N\eta$, $N\eta^\prime$, $N\omega$, $N1/2^+(1440)\pi$, and $\Delta3/2^+(1600)\pi$, in a relativized...