Production of Sigma(0) Hyperon and Search of Sigma(0) Hypernuclei at LHC with ALICE

The first measurements of the transverse momentum (pT) spectra and integrated yields and mean pT of Sigma(0) and Sigma(-0) hyperons in pp collisions at root s = 7 TeV at the LHC are presented. The Sigma(0)(Sigma(-0)) is reconstructed via its electromagnetic decay channel Lambda((Lambda) over bar) +gamma The Lambda ((Lambda) over bar) baryon is reconstructed via its decay into p + pi(-) ((p) over bar + pi(+)), while the photon is detected by exploiting the unique capability of the ALICE detector to measure low-energy photons via conversion into e(+)e(-) pairs in the detector material. The yield of Sigma(0) is compared to that of the. 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. In addition, the feasibility of a search for a bound state of proton, neutron and Sigma(0)(Sigma(0) hypernuclei 3(Sigma)(0) H) is presented, based on the luminosities foreseen for the LHC Runs 3 and 4.