000000889 001__ 889
000000889 005__ 20180531042156.0
000000889 037__ $$aBELLE2-NOTE-PL-2018-009
000000889 041__ $$aeng
000000889 100__ $$aTorben Ferber
000000889 245__ $$aPlot of π0 → γ γ invariant mass in 5 pb-1 of collision data
000000889 260__ $$a$$c2018-05-31
000000889 300__ $$a1
000000889 520__ $$aThis 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.
000000889 8560_ $$fphillip.urquijo@desy.de
000000889 8564_ $$uhttps://docs.belle2.org/record/889/files/BELLE2-NOTE-PL-2018-009.pdf