Spin asymmetries in {gamma} N {yields} {bar K}* {Theta}{sup +}
The photoproduction processes of the exotic {Theta}{sup +}(1540) baryon and the K* meson from the nucleon targets, i.e., {gamma}n {yields} K*{sup -} {Theta}{sup +} and {gamma}p {yields} {bar K}*{sup 0}{Theta}{sup +} are investigated in a hadronic model. We consider K and K* exchanges as well as the s and u channel nucleon and {Theta} terms. Various spin asymmetries together with cross sections are first computed in order to study the production mechanisms and the parity of the {Theta}{sup +}(1540) baryon. Within the uncertainties arising from the model-dependence of the production mechanisms and several coupling constants, we find that some target-recoil double spin asymmetries, C{sub xx{prime}}{sup TR} and C{sub xx{prime}}{sup TR} are sensitive to the parity of {Theta}{sup +}. In addition, the parity asymmetry of this reaction on the neutron target, which can be obtained by analyzing K* decay distribution, is found to be useful to estimate the K* N{Theta} coupling.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 836842
- Report Number(s):
- JLAB-THY-03-223; DOE/ER/40150-3141; hep-ph/0312229; NUPABL; TRN: US0500813
- Journal Information:
- Nuclear Physics, A, Vol. 745; Other Information: PBD: 1 Nov 2004; ISSN 0375-9474
- Country of Publication:
- United States
- Language:
- English
Similar Records
Photoproduction of the {theta}{sup +} resonance on the nucleon in a Regge model
Search for $\Theta^+(1540)$ pentaquark in high statistics measurement of $\gamma p \to \bar K^0 K^+ n$ at CLAS