El Cuerpo
Académico de Partículas Campos y Relatividad General invita
cordialmente a su próximo seminario
Spin physics
with strange hadrons: polarization and spin alignment
Dr. Eleazar Cuautle
Flores
Instituto de Ciencias Nucleares, UNAM
(En estancia sabática
en la FCFM, BUAP)
Este
seminario se llevará a cabo en la
Sala de Conferencias 111B/302
Miércoles 6 de junio de 2012
12:00 hrs.
Resumen:
Polarization may provide valuable insights into the
evolution of the system, the hadronization mechanism,
and the origin of hadronic spin preferences. The
present talk discuss a production mechanism from which the $\Lambda^0$
polarization in $pp$ collisions could be explained and
predictions for Lead-Lead are presented. The method used in $\Lambda^0$
polarization, can be used in similar way to estimate the spin alignment of the
vector mesons $K^{*0}$ and $\phi(1020)$ reported by STAR
at RHIC. These measurements are consistent with the absence of spin alignment
with respect to the reaction plane, whereas when it is measured with respect to
the production plane, a non-zero and transverse momentum dependent spin
alignment is found in mid-central Au + Au collisions. We explain these results
in terms of a simple model of vector meson production where the spin of their
constituent quarks is oriented during hadronization
as the results of Thomas precession. The model is then used to predict the spin
alignment for other vector mesons such as $\rho^0$ and $\omega$.