Plot of π0 → γ γ invariant mass in 5 pb-1 of collision data

Sumitted to PubDB: 2022-01-24

Category: Conference papers and plots, Visibility: Public

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Authors	Torben Ferber
Date	May 31, 2018
Belle II Number	BELLE2-NOTE-PL-2018-009
Abstract	This figure shows the invariant mass distribution of $\pi^0 \to \gamma \gamma$ in 5 pb$^{-1}$ of collision data. Events are required to contain at least three good tracks to purity the sample with processes of the type $e^+e^- \to $ hadrons, while rejecting beam induced background, Bhabha scattering, and other low multiplicity background sources. The photon daughters of the $\pi^0$ candidates are required to have an energy of greater than 150 MeV, and to be within the acceptance of the Central Drift Chamber (CDC). The internal document reference is BELLE2-NOTE-PH-2018-002.