170 likes | 311 Views
PID Band Structure Check and p p pi- final state. Y.C.Han@ K0 meeting Nov22, 2007. PID Band Structure. Yellow: Deutron Red: Proton Purple: Kaon Green: Pi+ Blue: Pi-. Time Relation. IH CTime. OH MeanCTime. Flight Time (OH – IH). Target Region. -2.5cm<X<1.5cm.
E N D
PID Band Structure Checkandp p pi- final state Y.C.Han@ K0 meeting Nov22, 2007
PID Band Structure Yellow: Deutron Red: Proton Purple: Kaon Green: Pi+ Blue: Pi-
Time Relation IH CTime OH MeanCTime Flight Time (OH – IH)
Target Region -2.5cm<X<1.5cm
Particle Type Pion Plus Pion Minus Unknown Proton
Vertex Type Proton Proton Pi- Proton Pi+ Pi- Pi+ Pi- Pi- Pi+ Pi+ Pi- Unknown
IH OH and Tag segment No obvious dependence on single segment.
Conclusion PID band structure related to the 2nsec like band structure of time of flight; The band structure tends to more obvious in the non-target region, unknown particles, unknown vertex; while shows no dependence on the IH, OH, or Tag segment hit.
Tagger photon and pppi final state Final Momentum= | mom_p1+mom_p2+mom_pi- |
Cut region 50 40 30 20 10 1
Cut Result Jan2007 Total pppi- Events: 22138 50 2470 events 40 1953 events 20 999 events 30 1454 events 10 508 events 1 58 events
IH deposit energy correction Mean Momentum Proton 520 531 Pi- 363.5 365.9
After correction 50 40 30 20 10 1 /c
After correction Cut region MeV/c Cut region MeV/c 1935 events 2431 events 50 40 1455 events 947 events 30 20 457 events 51 events 1 10
Tagger photon vs final mom with final IM cut Cut Region 50 40 30 20 10 1 /(c*c)
Tagger photon vs final mom with final IM cut 2014 events 2482 events 1465 events 947 events 469 events 45 events