Possible methods for the determination of the $P$-parity of the ${\Theta }^{+}$-pentaquark in NN-collisions

Abstract

We present two possibilities to determine the P-parity of the pentaquark ${\Theta }^{+}$, in a model independent way, via the measurement of polarization observables in $p+p\to {\Theta }^{+}+{\Sigma }^{+}$, or $n+p\to {\Theta }^{+}+{\Lambda }^0$, in the near threshold region. Besides the measurement of the spin correlation coefficient, $A_{xx}=A_{yy}$, (in collisions of transversally polarized nucleons), the coefficient $D_{xx}$ of polarization transfer from the initial proton to the final ${\Sigma }^{+}({\Lambda }^0)$ hyperon is also unambiguously related to the ${\Theta }^{+}$ parity.

arXiv comment7 pages, 1 figure

References in corpus (2)

• Close-to-threshold Meson Production in Hadronic Interactions
• Spin Transfer in Exclusive Lambda Production from pp Collisions at 3.67 GeV/c

Cited by in corpus (11)

• Pentaquark Theta^+(1540) production in gamma N --> K Anti-K N
• Magnetic moments of antidecuplet pentaquarks
• Spin observables and the determination of the parity of ${\Theta }^{+}$ in photoproduction reactions
• On the determination of the parity of the ${\Theta }^{+}$
• Spin structure of spin-1/2 baryon and spinless meson production amplitudes in photo and hadronic reactions
• 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
• Model-independent methods to measure the $P$-parity of the ${\Theta }^{+}$-pentaquark in photoproduction experiments
• Production of the pentaquark ${\Theta }^{+}$ in $np$ scattering
• $P$-parity of charm and strange particles in electroproduction processes, in collinear regime
• Spin correlations in the reaction "pi \vec D --> \vecΣΘ^+" and the parity of Theta^+
• Angular distribution and azimuthal asymmetry for pentaquark production in proton-proton collisions