Speaker
Description
The first measurements of $\Sigma^{0}$ and $\overline{\Sigma}^{0}$ baryons transverse momentum ($p_{\rm{T}}$) spectra, integrated yields and mean $p_{\rm T}$ in pp collisions at $\sqrt{s} = 7$ TeV at the LHC are presented. The $\Sigma^{0}$ ($\overline{\Sigma}^{0}$) signal is reconstructed via the $\Lambda$ ($\overline{\Lambda}$) + $\gamma$ decay channel by invariant mass analysis. The $\Lambda$ ($\overline{\Lambda}$) baryon is reconstructed in its decay
into p + $\pi^{-}$ ($\overline{ \rm{p}} + \pi^{+}$), while the photon is detected exploiting the unique capability of the ALICE detector to measure low energy photons via conversion into e$^{+}$e$^{-}$ pairs.
The yield of $\Sigma^{0}$ is compared to that of the
$\Lambda$ baryon, which has the same quark content but different
isospin. These data contribute to the understanding of hadron production mechanisms and provide a reference for constraining QCD-inspired models and tuning Monte Carlo event generators such as PYTHIA.
