Model-independent methods to measure the $P$-parity of the ${\Theta }^{+}$-pentaquark in photoproduction experiments

Abstract

We discuss model independent methods to measure the $P$-parity of the ${\Theta }^{+}$-pentaquark, in the simplest processes of photoproduction, $\gamma +N\to \bar{K}+{\Theta }^{+}$, using definite relations between T-even polarization observables, which depend on the $P$-parity of the ${\Theta }^{+}$ baryon (with respect to the $NK$ system). One method, which holds for any photon energy and any $K$ meson production angle, is based on the relation between the ${\Sigma }_B$ asymmetry (induced by a linearly polarized photon beam, with unpolarized target) and the $D_{nn}$ component of the depolarization tensor (for unpolarized photon beam). Another method, which applies in collinear kinematics (or in threshold conditions), is related to the sign of the $D_{nn}$ component, with linearly polarized photon beam.

8 pages

References in corpus (9)

• Pentaquark hadrons from lattice QCD
• Understanding Pentaquark States in QCD
• Pentaquark states in a chiral potential
• A Method to Unambiguously Determine the Parity of the Theta+ Pentaquark
• Double polarization asymmetry as a possible filter for ${\Theta }^{+}$'s parity
• Spin observables and the determination of the parity of ${\Theta }^{+}$ in photoproduction reactions
• A possibility to determine the P-parity of the ${\Theta }^{+}$ pentaquark in the $pn\to {\Lambda }^0{\Theta }^{+}$ reaction
• Possible methods for the determination of the $P$-parity of the ${\Theta }^{+}$-pentaquark in NN-collisions
• Polarization phenomena in open charm photoproduction processes

Cited by in corpus (6)

• Pentaquark Theta^+(1540) production in gamma N --> K Anti-K N
• On the determination of the parity of the ${\Theta }^{+}$
• Polarization observables in the processes $p+p\to {\Theta }^{+}+{\Sigma }^{+}$ and $n+p\to {\Theta }^{+}+{\Lambda }^0$, for any spin and parity of the ${\Theta }^{+}$-hyperon in the threshold region
• Photoproduction and Radiative Decay of Spin 1/2 and 3/2 Pentaquarks
• Possibility of determinig the parity of the pentaquark ${\Theta }^{+}$ from photoproduction near threshold
• Antikaon angular distributions in the reaction $\gamma d\to K^{-}{\Theta }^{+}p\to K^{-}{K}^{+}np$ near the threshold and the parity of the ${\Theta }^{+}$ pentaquark