07/18/0806/17/08Group Meeting Chun-Min Jen 1 CLEO-c D + s e e Prof. Sheldon Stone, Dr. Liming Zhang Speaker : Chun-Min (Mindy)

07/18/0806/17/08 Group Meeting Chun-Min Jen

1

CLEO-cCLEO-cDD++

s s eeee

Prof. Sheldon Stone, Dr. Liming ZhangSpeaker : Chun-Min (Mindy) Jen

Syracuse Universityon behalf of CLEO collaboration


2

Apply different selection criteria on the determination of +/+ fake to e+ rate from what we did for D+

s ee.

we require every charged track, composed of e± or ± or ±, should pass “GoodTrack”, “KaonOK” and “PionOK”.

we didn’t require the final state be *only* one charged track; instead, we allow more than one charged track appeared as our final states.

Only those signal charged tracks within the signal and sideband regions of single-tags are dumped into n-tuples as raw data.

We didn’t exclude those charged tracks with the same charge-sign as that of the mother of single-tags, DS

Signal single track's momentum > 0.2 GeV

|COS θe| < 0.8 for signal single charged track

We store lots of info. Into our n-tuples.

e+ e-

D-/+S

Ec.o.m.=MeV

D*±S

D±S

+

e+

e

D+S

D-S

D-S

D+S

±± from same/opposite-sign

DS may fake into e+

I : Inclusive D+S X e+ e

Our New Plan

e-

Sometimes, don’t believe your eyes.


3

DS signal

Mass region

DS sideband

Mass region

± / ± fake into e±

For one-prong

K± / ± fake into e±

For one-prong


For multiple-prong


For multiple-prong

K± /± fake into e±

For one-prongSideband-subtracted


For multiple-prongSideband-subtracted


4

MomentumMomentum Distribution in Data

EID & Kaon-ID & Pion-ID for oppositeopposite - sign of Ds

± fake into e± w/o bin-by-bin weighting momentum distributions by fake rates


5



± fake into e± w/ bin-by-bin weighting momentum distributions by fake rates


6

Extra EnergyExtra Energy Distribution in Data




7





8





9





10





11





12


EID & Kaon-ID & Pion-ID for samesame - sign of Ds

e± w/ bin-by-bin weighting momentum distributions by fake rates


13


EID & Kaon-ID & Pion-ID for samesame - sign of Ds

e± w/ bin-by-bin weighting momentum distributions by fake rates

Table I. Refer to Chul-Su Park’s CBX

One-Prong # of fake events(after sideband-subtracted)

Before multiplying fake-rate ± e±

3558 ; [Eextra < 0.4 GeV] = 1103

After multiplying fake-rate ± e±

14 ; [Eextra < 0.4 GeV] = 5


14230 ; [Eextra < 0.4 GeV] = 1913


4 ; [Eextra < 0.4 GeV] = 1

Table II. Refer to Chul-Su Park’s CBX

Multiple-Prong # of fake events(after sideband-subtracted)


11945 ; [Eextra < 0.4 GeV] = 6123


33 ; [Eextra < 0.4 GeV] = 19


69142 ; [Eextra < 0.4 GeV] = 23129


19 ; [Eextra < 0.4 GeV] = 7


16

Future Plan …

Get the branching fraction measurement for inclusive D+

S X e+ e

Get the preliminary branching fraction

measurement for D+S +

Documents

07/18/0806/17/08Group Meeting Chun-Min Jen 1 CLEO-c D + s e e Prof. Sheldon Stone, Dr. Liming Zhang Speaker : Chun-Min (Mindy)