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High-mass resonance with K* data. Hyosang Lee Pusan National University 2008/05/01 LEPS Collaboration Meeting. Motivation. Standard cut. Cut value. ntrk ≠ 2 Eg = 0 || fntag = 0 Zvtx < -1100 || -870 6 pm = 0 ithtofhit = 90 - PowerPoint PPT Presentation
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High-mass resonanceHigh-mass resonancewith K* datawith K* data
Hyosang LeeHyosang LeePusan National University
2008/05/01LEPS Collaboration Meeting
MotivationMotivation
Cut Cut valuevalue
Standard cutStandard cut
ntrk ≠ 2 Eg = 0 || fntag = 0 Zvtx < -1100 || -870<Zvtx noutl > 6 pm = 0 ithtofhit <= 0 | ytof – tofdiff | >= 90 | itof – tofid | >= 2 prbchi2 <= 0.02
Zvtx
Cut Cut valuevalue
KK++ selection cut selection cut
m/q(GeV/c2)
p(G
eV
/c)
m/q(GeV/c2)
p(G
eV
/c)
K* Data K* Data samplesample
MM(MM(,K,K++)X)X
MM(MM(,K,K++))++XXMM(MM(,K,K++)X)X
MM(MM(,K,K++)K)K--XX
MM(MM(,K,K++))++XX
MM(MM(,K,K++)pX)pX
K* Data K* Data samplesample
high-mass resonancehigh-mass resonance
SS01****01****
DD13****13****
KK++++ eventsevents
Missing massMissing mass
MM(MM(,K,K++)X)X MM(MM(,K,K++++)X)X
KK++++ eventsevents
Missing massMissing mass
MM(MM(,K,K++)X)X
MM
(M
M(
,K,K++++
)X)X
KK++++ eventsevents
MM(MM(,K,K++)X)X MM(MM(,K,K++++)X)X
Y*+
-+
Y*Y*
KK++++ eventsevents
MM(MM(,K,K++++)X)X MM(MM(,K,K++)X)X
Y*Y*
Y*+
Y*+
KK++++ eventsevents
++ background background
m/q(GeV/c2)
p(G
eV
/c)
selectedselected
MM(MM(,K,K++)X)X
KK++ - - eventsevents
Missing massMissing mass
MM(MM(,K,K++)X)X MM(MM(,K,K++--)X)X
KK++ - - eventsevents
Missing massMissing mass
MM(MM(,K,K++)X)X
MM
(M
M(
,K,K++++
)X)X
+ K+
KK++ - - eventsevents
Miss identification Miss identification
VetoVeto
MM(MM(,K,K++)X)X
MM(MM(,,)X)X
KK++ - - eventsevents
K* eventsK* events
VetoVeto
MK+- MK+-
K*K*
MM
(M
M(
,K,K++)X)X
KK++ - - eventsevents
Missing massMissing mass
MM(MM(,K,K++)X)X MM(MM(,K,K++--)X)X
KK++ - - eventsevents
Missing massMissing mass
MM(MM(,K,K++)X)X
MM
(M
M(
,K,K++++
)X)X
KK++ - - eventsevents
Y*Y*
Y*-
MM(MM(,K,K++)X)X MM(MM(,K,K++--)X)X
KK++ - - eventsevents
MM(MM(,K,K++)X)XMM(MM(,K,K++--)X)X
Y*Y*
KK++KK-- eventsevents
Missing massMissing mass
MM(MM(,K,K++)X)X MM(MM(,K,K++--)X)X
ppKK++Y*Y*KK++pKpK--
KK++KK-- eventsevents
eventevent
MK+-
vetoveto
MK+-
MM
(M
M(
,K,K++)X)X
KK++KK-- eventsevents
Y*Y*pKpK--
Mp-MM(MM(,K,K++--)X)X
pp
ppKK++Y*Y*KK++pKpK--
KK++p p eventsevents
Missing massMissing mass
MM(MM(,K,K++)X)X MM(MM(,K,K++p)Xp)X
KK++p p eventsevents
Missing massMissing mass
MM(MM(,K,K++)X)X
MM
(M
M(
,K,K++p
)Xp
)X
KK++p p eventsevents
MM(MM(,K,K++)X)X MM(MM(,K,K++p)Xp)X
Y*Y*pKpK--
Y*Y*pKpK--
KK++p p eventsevents
Y*Y*pKpK--
MM(MM(,K,K++)X)XMM(MM(,K,K++p)Xp)X
SummarySummarySummarySummary
We are looking for the high-mass hyperon resonances above 1.52 GeV.
We observed a clear peak at 1.67 GeV, which can be interpreted as either L1670 (D03…) or S1670(D13).
The peak is strongly coupled to the decay channel
Y* S pi
We need more statistics to confirm our finding.
LD2 data may help us identify if the Y* is L or S.
Y* can be also coupled to KN channel. We are going to see K-p data.
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