One,Two pion channels from PE target August 2014 (~10 hours of beam). 50 MLN events (1.2 shift ) Day 232/233 Piotr & Witek. P π - events with PID. Elastic events. P π - π 0. Elastic events selected by condition on azimuthal and polar angle correlation ( see next slide )
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50 MLN events (1.2 shift)
Piotr & Witek
tan1 * tan2distribution
Remark ; can be used to determine pion beam momentum or alternatively to check pion momentum reconstruction with Tracker
Widthdepends on pion momentum !
Cooplanarity of twotracks
Pπ- inv. mass
~16 MeVbelownominal CMS for 0.69 GeV/c pions
1.2% resolution from HADES reconstruction AND spread of pion incomingmomentum
Agust data and Background from July (carbon) not quiteyetperfect for August data (timecalibrationaffects PID cuts..)
For comparison: right same but both data samples from July with same timecalibration and PID cuts