The XXVII International Scientific Conference of Young Scientists and Specialists (AYSS-2023)

Systematic studies of background subtruction under Σ0 mass peak measured at LHC with ALICE in pp collisions at s=13TeV

31 Oct 2023, 16:50

15m

Conference Hall, DLNP

Oral High Energy Physics High Energy Physics

Speaker

Nikita Gladin (MIPT, laboratory of fundamental interactions)

Description

The ${\mathrm{\Sigma }}^0$ hyperon is reconstructed via its electromagnetic decay into $\mathrm{\Lambda }+\gamma$ due to the unique ability of ALICE to register low-energy photons.

Different methods of background subtraction for the measurement of the yield of ${\mathrm{\Sigma }}^0$ hyperon invariant are investigated. It is done by
the approximation of the background shape by the
polynomial function and the application of the mixed background technique with Lambda hyperon taken from one event and photon from another. For the mixed background, the counting regions of the signal events were varied. A comparison of the methods has been conducted.

The ${\mathrm{\Sigma }}^0$ hyperon yields are presented in different transverse momentum regions with corresponding systematic uncertainties.

Presentation materials

Gladin_AYSS_2023.pdf