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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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one two pion channels from pe target august 2014 10 hours of beam

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 events with pid
Pπ- events with PID

Elasticevents

Pπ-π0

  • Elasticeventsselected by condition on azimuthal and polar anglecorrelation (seenextslide)
  • Red line – background from Carbon scaled from 2MLN eventscollected on carbon target in July
p elastic events
Pπ- elasticevents

tan1 * tan2distribution

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

p elastic events selected via angular correlations
Pπ- elasticevents: selected via angularcorrelations
  • Pion – proton correlations
  • ~ 2.7 MLN elasticevents
total cms of elastic events
TOTAL CMS of elasticevents

Pπ- inv. mass

~16 MeVbelownominal CMS for 0.69 GeV/c pions

1.2% resolution from HADES reconstruction AND spread of pion incomingmomentum

p 0 elastic events selected vie veto on elastic
P π- π0 elasticevents: selectedvie veto on elastic
  • 0.33 MLN π- π0 events (afterbackgroundsubtraction)
  • background (red) taken from carbon run in July (not completelyperfectbecuse of slightdifference in timecalibration- to be improved). Nevertheless, fitsquitegood
n selected with pid
nπ- π+ selected with PID

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

n selected with pid missing mass cut
n π- π+ selected with PID & missing mass cut
  • 0.56 MLN 2 pion eventsafterbackgroundsubtraction from 52 MLN events- as expected from JULY 1 MLN needs 100 MLN (2 shifts)
  • background not easy to subtract from PE data alone, would be much easier to havededicated run with carbon target for backgroundsunbtraction
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