000000872 001__ 872
000000872 005__ 20220124075753.0
000000872 037__ $$aBELLE2-NOTE-PL-2018-006
000000872 041__ $$aeng
000000872 100__ $$aBryan Fulsom
000000872 245__ $$aPlot of K_S^0 → π+ π- invariant mass in 5 pb-1 of collision data
000000872 260__ $$c2018-05-25
000000872 300__ $$a1
000000872 520__ $$aThis figure shows the invariant mass distribution of K^0_S → π+ π-  in 5 pb^{-1} of collision data. Events are required to contain at least three good tracks to reject beam induced background, Bhabha scattering, and other low multiplicity background sources. The charged pion tracks from the K^0_S candidates are required to have a z-direction impact parameter, z0, in the range of -4 to 6 cm to ensure the tracks originate from near the interaction region. A vertex fitter based on a Kalman algorithm is used to fit the vertex to reject candidates where the tracks do not originate from near a common decay point.     The internal document reference is BELLE2-NOTE-PH-2018-001.
000000872 8560_ $$fpurquijo@unimelb.edu.au
000000872 8564_ $$uhttps://docs.belle2.org/record/872/files/BELLE2-NOTE-PL-2018-006.pdf
000000872 8564_ $$uhttps://docs.belle2.org/record/872/files/BELLE2-NOTE-PL-2018-006.gif?subformat=icon$$xicon
000000872 8564_ $$uhttps://docs.belle2.org/record/872/files/BELLE2-NOTE-PL-2018-006.gif?subformat=icon-700$$xicon-700