charged kaon lifetime
DESCRIPTION
Paolo Massarotti K charged meeting 29 July 2004. Charged kaon lifetime. F. Ambrosino, P. De Simone, P. Massarotti, V. Patera. Measure ot T : length. •. - PowerPoint PPT PresentationTRANSCRIPT
Charged kaon lifetime
F. Ambrosino, P. De Simone, P. Massarotti, V. Patera.
Paolo Massarotti K charged meeting 29 July 2004
Background analisys
Four falimies:
good vertex (~ 69%)
kaon hits associated to daughter track (~ 20%)
Daughter hits associated to kaon track (~ 5%)
kaon broken track(~ 6%)
Daughter P*with kaon mass hypothesis
Cut on 100 MeV
Paolo Massarotti K charged meeting 29 July 2004
Measure of
on MCaG = (101.2 ) x10-2
bG = (.15 ) x10-3
T+MC = (12.35±0.08) ns
T-MC = (12.37±0.11) ns
T+true = 12.37 ns
Paolo Massarotti K charged meeting 29 July 2004
MC trueMC reco
Measure of : time
kaonfrom 0
We useneutral and charged
vertex
Paolo Massarotti K charged meeting 29 July 2004
Neutral vertex efficiency
we look for a vertex with: 1 on time
P* < 220 MeV
Paolo Massarotti K charged meeting 29 July 2004
•kaon
daughter
on time
Neutral vertex efficiency: MC true and reco
Paolo Massarotti K charged meeting 29 July 2004
MC trueMC reco
aNV = (104.7 ) x10-2
bNV = (2.0 ) x10-3
from 0 recostruction efficiency
Paolo Massarotti K charged meeting 29 July 2004
aNV = (96.15 ) x10-2
bNV = (.33 ) x10-3
Contamination:
Paolo Massarotti K charged meeting 29 July 2004
minus
plus
aNV = (2.6 ) x10-2
bNV = (.50 ) x10-3
aNV = (1.7 ) x10-2
bNV = (.91 x10-3
Neutral and charged vertex efficiency: MC true and reco
Paolo Massarotti K charged meeting 29 July 2004
aNV CV = (106.3) x10-2
bNV CV= (1.8 ) x10-3
Measure of T: MC
T+MC = (12.35 ± 0.04) ns T-
MC = (12.38 ± 0.02) ns
Paolo Massarotti K charged meeting 29 July 2004