Outline Detectors and Methods –Spectrometer layout –Segmented target, OOT cut effectiveness...
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![Page 1: Outline Detectors and Methods –Spectrometer layout –Segmented target, OOT cut effectiveness –CITADL Kaonicity pion ID effect on K-pi reflection –Target.](https://reader034.fdocuments.us/reader034/viewer/2022051517/5697bf711a28abf838c7dfaf/html5/thumbnails/1.jpg)
Outline• Detectors and Methods
– Spectrometer layout– Segmented target, OOT cut
effectiveness– CITADL
• Kaonicity• pion ID effect on K-pi
reflection– Target Silicon– Vertexing and skim strategy– Omega signal
• EM Calorimeters & Muon Upgrades– IE & OE
• pi0 reconstruction– D*-D mass– Semileptonic Physics
• Form Factor Measurement• D0-D0bar mixing
• FOCUS Physics– K K Ks Dalitz– DCSD : D+ -> KKK– Charm baryon signals
• CascadeC -> p k pi• LambdaC -> sigma pi pi
– Double-D Production– K K pi Dalitz– D lifetimes
• CP Violation and Mixing– D0 CP eigenstate lifetime diffs.
• CLEO plots• FOCUS Advantages• K-pi signal• Skim Strategy (candidate-
driven)
– CP asymmetry (Daniele)– CP asymetry (O’Reily)
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Segmented TargetD
ecays/2
00
m Be
OBeO
tarsil
tarsil
black - primary vertex red - secondary vertex
• 62% of D decays occur in air• Out-of-Material cut virtually eliminates non-charm backgrounds
From background subtracted charm!
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D+ Yield = 11528 S/N = 2.8
p( )M KK
DKK
p( )M KK
D+ Yield = 7157 S/N = 10
Out of Material
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“Kaonicity” Golden Kaons & pions
Likelihood based Cerenkov algorithm
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D+ +- without Cerenkov ID
K reflection
signal
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D+ +- with loose pion IDp- >1.0KW W
Yield = 3317
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D+ +- with tight pion ID
Yield = 2092
p- > 4.0KW W
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0 reconstruction with the IE and OE
Y ield = 1 0 7 1 4S/N = 1 5
(with D* tag)
D0 K-+0
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2 0( )M
2( )M K
*K
*0 0K
0K
D0 K-+0 has a rich substructure with lots of interference
![Page 10: Outline Detectors and Methods –Spectrometer layout –Segmented target, OOT cut effectiveness –CITADL Kaonicity pion ID effect on K-pi reflection –Target.](https://reader034.fdocuments.us/reader034/viewer/2022051517/5697bf711a28abf838c7dfaf/html5/thumbnails/10.jpg)
Target Silicon Detector
20
25
30
35
40
45
50
5800 7800 9800 11800 13800run number
Proper time resolution vs run number
TS used
No TSTS inst
alle
d
ts ( )fs
Target Silicon detector improves proper time resolution by about 20%
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D*-D Mass Difference Measurements• These measurements hilight our improved 0
reconstruction• Statistical errors should be about 3 times better than
present world average
*0 0( ) ( )M D M D
*0 0 0 0,D D D K
= 142.02 0.03 MeV
PDG = 142.12 0.07 MeV
M
* 0,D D D K
*( ) ( )M D M D
= 140.72 0.03 MeV
PDG = 140.64 0.10 MeV
M
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c pK
Charm Baryon Signals
Cabibbo suppressed decay mode of the
(first observed by SELEX)
c
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2GeV/c 2GeV/c
c c c
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Expected resonance contributions to D0 KKKS
Class 1 BSW requires resonance coupling to u-dbar quarks and a dikaon. The only resonances are:
•a0 (980) (sub-threshold)
•a2 (1320)Class 2 BSW requires resonance coupling to u-ubar quarks and a dikaon:
f0 (980) (subthreshold)
•f2 (1270)
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2( )SM K K
2( )M K K
lobes
0(980) ?a
0(980) ?f
2( ) (GeV/c )sM K KK
Dalitz Analyses SD K K K
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FOCUS Semileptonic Physics
• Measure Form Factors for
– Check against recent LGT calculations
• Cabibbo suppressed decays:• Semileptonic mixing:• Rare or forbidden decays:
Expect roughly 50 times more semimuonic events than E687 with our rebuilt muon system!
*0
*0s
s
D K
D
D
De eK
0D l D lr n p n+ ® ®* 0 0 ( )D D D Kp mp p n+ + ++ + -® ® ®
0D mm+ -®
![Page 17: Outline Detectors and Methods –Spectrometer layout –Segmented target, OOT cut effectiveness –CITADL Kaonicity pion ID effect on K-pi reflection –Target.](https://reader034.fdocuments.us/reader034/viewer/2022051517/5697bf711a28abf838c7dfaf/html5/thumbnails/17.jpg)
*0 ( )D K K
— Right Sign — Wrong Sign
RS-WS yield 56445
( )M K
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D0 CP eigenstate Lifetime Differences
CLEOassuming CP
CLEO allowi
ng CP
violation
M
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FOCUS can make competitive measurement
0 signal from FOCUSD K K
Y=16532 STN=2.3
Expect y =1.3%
(y (CLEO) = 1.73%)
M(KK)
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• Extremely good proper time resolution : 8% (D0)
– No resolution systematics or error inflation
• A segmented target with ~62% of decays verticizing in air
– Grossly minimizes absorption corrections in matter
• Excellent (and flexible) Cerenkov identification
– Vary misidentification reflections to gauge systematics.
• Skims use a vertexing algorithm with nearly flat t’ acceptance
– Minimizes any reliance on MC and reduces systematic error
• We expect to measure y to within 1.3%
FOCUS ADVANTAGES
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Skim Strategy with minimal time bias
K
KSeed track
Primary vtx track
Recoil charm track
Nearly uniform time acceptance --right up to the skim cut!
Nucleate about seed track to form a primary vertex.
Look for two tracks with a good intersection
A minimum bias skim for D0 KK
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CP Violation Search in D+ and D0 Decays
0
0Where( ) ( ) ( )
( ) ( ) ( )
( )CP
D D N D K KA D
D D N D K
D KK D KK D
Asymmetry mechanism in PythiaNeed to correct for production asymmetry which occurs at ~3% level
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*D *DExpecting 1-2% sensitivity
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Doubly Cabibbo Suppressed Decays
D Peak DS PeakD = 8.5 MeV/c2
DS = 8.5 MeV/c2
D KKK
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Double D Photoproduction Dynamics
Charm and anticharm acoplanarity distribution probes NLO QCD
The correlation between a charm particle and an anticharm particle in the same event
radians)
: kinematic tag
: Double D reconstruction ~