Speaker
Satoshi Yano
(Hiroshima University (JP))
Description
The $\omega$ meson is a promising probe to investigate the properties of the QGP. It is well known that the yield of high-p_t particles is suppressed in nucleus-nucleus collisions relative to that in pp collisions.
The effect is attributed to the energy loss of the energetic parent partons traversing the created medium.
Since $\pi^0$ and $\omega$ mesons have the same quark content (u and d), the comparison of the suppression between $\pi^$ and $\omega$ can provide
information whether the energy loss occurs at the parton level or not.
The ALICE detector covers a wide central region (|\eta|<0.9) to reconstruct charged particles and has two electro-magnetic calorimeters with good energy resolution. The $\omega$ meson is reconstructed in the $\pi^0\pi^+\pi^-$ channel in pp collisions at sqrt(s) = 7 TeV over a wide p_t range This is faciliated by a high-photon energy trigger. We discuss the trigger performance and cut optimization and present the latest results of the analysis.
Author
Collaboration ALICE
(CERN, Geneva, Switzerland)
Co-author
Satoshi Yano
(Hiroshima University (JP))
