M. Selen, CIPANP/03 1
Recent Results Recent Results
in Hadronic in Hadronic Charm DecaysCharm Decays
Mats Selen, University of Illinois2003 CIPANP, May 19-24, New York, NY
M. Selen, CIPANP/03 2
I will NOT talk about Ds0
Stay tuned for detailed experimental presentations:BaBar (Ray Cowan)CLEO (Jon Urheim)
Belle (Tom Browder)
plus a theoretical perspective from Harry Lipkin
M. Selen, CIPANP/03 3
The usual suspectsThe usual suspects
M. Selen, CIPANP/03 4
Charmed Baryons
M. Selen, CIPANP/03 5
Charm Baryon LifetimesThanks to Kevin Stenson for summary figure Phys.Lett.B561:41-48,2003
Phys.Lett.B541:211-218,2002 Phys.Rev.Lett.88:161801,2002 Phys.Lett.B523:53-59,2001
M. Selen, CIPANP/03 6
cc
(Steve Blusk)
09.009.036.0)()( 0
pKBB
c
TOTc
06.006.024.0)()(
pKBB
c
cCLpKB
B
c
c %90@ 65.0)()(
CLpKB
B
c
RESNONc %90@ 13.0)(
)( 0
CLEO-III Phys. Rev.D67:012001,2003
First ObservationFirst Observation
M. Selen, CIPANP/03 7
00cc pK pKKK
(Basit Athar)
CLEO-III 148 ± 18
77 ± 13
pKK Mass (GeV/c2)
Mass (GeV/c2)
04.008.035.0)()(
0
0
c
TOTALc
BKpKB
02.004.014.0)(
))892((0
0*0
c
c
BKpKB
03.005.021.0)(
)(0
0
c
RESNONc
BKpKB
First branching ratio measurement of this mode.(Made possible by CLEO-III RICH)
0cpKK
0c
** Preliminary **** Preliminary **
** Preliminary **** Preliminary **
M. Selen, CIPANP/03 8
cc00 ++
4291±93events
KKpp
80.5±10.8events
mass scale
456±23events
New c Mass Measurementprevious
** Preliminary **** Preliminary **
** Preliminary **** Preliminary **
M. Selen, CIPANP/03 9
cc00 ++
Production cross-section & xp spectrum:
From fit to Petersonfragmentation function
** Preliminary **** Preliminary **
** Preliminary **** Preliminary **
M. Selen, CIPANP/03 10
Charmed Mesons
M. Selen, CIPANP/03 11
Charm Meson LifetimesThanks to Kevin Stenson for summary figure
Phys.Lett.B537:192-200,2002
M. Selen, CIPANP/03 12
CDF: Huge charm physics potential
Enormous production cross-section
Secondary Vertex Trigger is working well!
Reconstructed withonline SVT tracks
450,000events
78,000events
M. Selen, CIPANP/03 13
DDSS++ - D - D++ Mass Difference Mass Difference
CDFCDF
FERMILAB-PUB-03/048-E
M. Selen, CIPANP/03 14
D0 K+K, +
** Preliminary **** Preliminary **
** Preliminary **** Preliminary **
M. Selen, CIPANP/03 15
D0 K+K, +
3453 ± 111
10830 ± 148
105030 ± 372
06.010.081.2)()(
0
0
DKKD
0014.00014.00993.0)()(
0
0
KDKKD
0006.00012.00353.0)()(
0
0
KDD
hep-ex/0212058
M. Selen, CIPANP/03 16
D+ +, K+, K+Ks(Chul Gwon)
• Unbinned maximum likelihood fit using FELIX.• Fit variables: M(D+), xpD, coshelicity • PDF’s obtained from MC & data
171±22 34±21 278±21 D D DS
M(D+) GeV M(D+) GeV M(D+) GeV
CLEO-II.V
** Preliminary **** Preliminary **
** Preliminary **** Preliminary **
< 0.0046 @ 90% CL
M. Selen, CIPANP/03 17
CLEO-II.V
** Preliminary **** Preliminary **hep-ex/0212058
044.0421.00
2 AA
195.0042.0cos
Isospin analyses using new DIsospin analyses using new D00 numbers numbers
New FOCUS ,
+old FOCUS + PDG
New CLEO+ PDG
KK
M. Selen, CIPANP/03 18
D0
)%023.0034.0257.0()()(
0
0
KDKKKD
))%(10.097.2()()(
0
0
statKD
KKD
))%(12.066.8()()(
0
0
statKD
D
FOCUS PreliminaryFOCUS Preliminary PDG2002PDG2002
)%09.032.0(
)%28.034.3(
)%6.08.9(
** Preliminary **** Preliminary **
M. Selen, CIPANP/03 19
hep-ex/0211056
D+, DS 5-body Decays(Branching Ratios)
006.0002.0058.0)(
)(0
KDKD
011.0017.0290.0)()(
0
KDD
010.0011.0145.0)(
)(
KKDD
s
s
021.0024.0249.0)(
)(
s
s
DD
019.0009.0040.0)()(
0
KDKKD
1st obs.
FOCUS also has new resultson D 6-body decays !
(inclusive ratios)
M. Selen, CIPANP/03 20
hep-ex/0211056
5-body Decays(Substructure)
NR
sum
NR
sum
Consistent with hypothesis that structure dominated by quasi 2-body decays:
(30 ± 4 ± 1)%
(21 ± 4 ± 6)%
(7 ± 5 ± 1)%
(40 ± 3 ± 6)%
(10 ± 6 ± 5)%
(21 ± 5 ± 6)%
(75 ± 6 ± 4)%
< 3% @ 90%CL 1
0* aKD 01a
1 aDS
Lipkin: Phys. Let. B 515, 81 (2001)
Central value of a1 mass is outside phase-space, but it’s wide (~400 MeV).
018.0008.0099.0)(
)(0
10*
KDaKD
044.0078.0559.0)(
)( 1
KKDaD
S
S
(corrected for unseen modes)
M. Selen, CIPANP/03 21
BaBarBaBar
D0 K0K+, K0K+ and K0K+K
15279 ± 129 11659 ± 40
805 ± 35 2109 ± 48
Normalizing mode
200
00
10)56.029.032.8()()(
KDKKD
200
00
10)41.025.068.5()()(
KDKKD
200
00
10)27.037.030.16()()(
KDKKKD
A Dalitz analysis was also done for each mode…A Dalitz analysis was also done for each mode…
hep-ex/0207089
Errors are ~ 3-5 times smallerErrors are ~ 3-5 times smallerthan previous measurementsthan previous measurements
M. Selen, CIPANP/03 22
D0 K0K+ Dalitz Analysis
BaBarBaBar
hep-ex/0207089
M. Selen, CIPANP/03 23
BaBarBaBar
D0 K0K+ Dalitz Analysis
hep-ex/0207089
M. Selen, CIPANP/03 24
BaBarBaBar
D0 K0K+K
Dalitz Analysis
hep-ex/0207089
M. Selen, CIPANP/03 25
D0Ks (Mikhail Dubrovin)
CLEO-II.V
• Motivated by interest in KS and KSKK+ analyses.• KSa0(980) seen in KS
• but a0(980) is dominant
• First measurement of this BR
05.007.038.0)()(
00
00
S
S
KDKD
** Preliminary **** Preliminary **
** Preliminary **** Preliminary **
M. Selen, CIPANP/03 26
D0Ks (Mikhail Dubrovin)
CLEO-II.V
KSa0(980) is dominantK*(892) is seenSomething else needed for good CL(but exactly what hard to sort out):NR, KSa2(1320), KSa0(1450), K0(1430), K1(1410) …
Under investigation: stay tuned !
** Preliminary **** Preliminary **
M. Selen, CIPANP/03 27
D0 Ks+ (David Asner)
CLEO-II.V
Fit Fraction (%) (stat err shown)
0.34 ± 0.13
65.7 ± 1.3
26.4 ± 0.9
0.72 ± 0.18
f 4.3 ± 0.5
f 0.27 ± 0.15
f 9.9 ± 1.1
7.3 ± 0.7
1.1 ± 0.2
2.2 ± 0.4
NR 0.9 ± 0.4
m2(S) (GeV2) 0 1 2 3
m2() (GeV2) 0 1 2 3
m2(S) (GeV2) 0 1 2 3
m2 (
)
(GeV
2 )
m2(S)RS (GeV2)
S/(S+B) ~ 98% S ~ 5300
Phys. Rev. Lett.89:251802,2002
0
1
2
0 1 2 3
M. Selen, CIPANP/03 28
BaBarBaBar
D0 KS+
• BaBar has incredible statistics!• Unprecedented sensitivity !
• Will the standard approach work ?• There are hint of “problems” in many lower statistics Dalitz analyses.• Will have to confront these!
From Brian Meadows, Moriond/03From Brian Meadows, Moriond/03
M. Selen, CIPANP/03 29
D+ Dalitz
m2 (GeV2)
0 1 2 3m2
(GeV2)0 1 2 3
Fit Frac. (%) Fit Frac. (%)
20.8 ± 2.4 33.6 ± 3.2 ± 2.2
f 7.4 ± 1.4 6.2 ± 1.3 ± 0.4
f 6.3 ± 1.9 19.4 ± 2.5 ± 0.4
f 10.7 ± 3.1 2.3 ± 1.5 ± 0.8
22.6 ±3.7 0.7 ± 0.7 ± 0.3
Non-res 38.6± 9.7 7.8 ± 6.0 ± 2.7
46.3 ± 9.0 ± 2.1
138/162
Phys.Rev.Lett.86:770-774,2001
Phase motion consistent with :(Method discussed in
PLB 550:135-139,2002)
M. Selen, CIPANP/03 30
D0+0
(Charles Plager)
CLEO-II.V
m2() (GeV2)
m2 (
)
(GeV
2 ) S/(S+B) ~ 80%
S ~ 1100
No contribution from (500) at ~1% level
m2() (GeV2)
0 1 2 3m2() (GeV2)
0 1 2 3m2() (GeV2)
0 1 2 3
Amplitude Phase Fit Fraction
+ 1 (fixed) 0 (fixed) 76.5±1.8±4.8
0 0.56±0.02±0.07 10±3±3 23.9±1.8±4.6
0.65±0.03±0.04 4±3±4 32.3±2.1±2.2
NR 1.03±0.17±0.31 77±8±11 2.7±0.9±1.7
** Preliminary **** Preliminary **
M. Selen, CIPANP/03 31
D+ Dalitz Phys.Rev.Lett.89:121801,2002
Fit Frac. (%) Fit Frac. (%)
13.8 ± 0.5 12.3 ± 1.0 ± 0.9
K* 30.6 ± 1.6 12.5 ± 1.4 ± 0.5
K* 0.4 ± 0.1 0.5 ± 0.1 ± 0.2
K* 3.2 ± 0.3 2.5 ± 0.7 ± 0.3
Non-res 90.9± 2.6 13.0 ± 5.8 ± 4.4
47.8 ± 12.1 ± 5.3
46/63
0 1 2 3m2
(GeV2)0 1 2 3
m2 (GeV2)
CLEO Dalitz analysisof D0 0 seesno evidence for .Phys. Rev.D63:092001,2001
M. Selen, CIPANP/03 32
D+ Dalitz
Stay TunedNew results expected later this year
M. Selen, CIPANP/03 33
BESBES
& from J/ decays
Preliminary BES results indicate significant contributionfrom and in J/ and J/ respectively
Ning Wu (IHEP, Beijing) from talk given at “Hadron Spectroscopy….” Tokyo, Feb/03
M. Selen, CIPANP/03 34
D0 Ks0 (Scott Davis)
(Just a peek…stay tuned)CLEO-II.V+III
• Complement KSanalyses• Good place to search for low mass
• No 00 to get in the way!• Fit seems to prefer presence of a broad scalar resonance (?)
• No unique solution using BW’s.• Also trying K-matrix approach.
S/(S+B) ~ 70% S ~ 700
m2 (
)
(GeV
2 )
m2(S)RS (GeV2)
m2() (GeV2)
0 1 2
K*(890) + K0(1430) + f0 + NR
m2() (GeV2)
0 1 2
K*(890) + K0(1430) + f0 + NR +
Not the only way to get a good fit…more work needed
M. Selen, CIPANP/03 35
D0KK+0 (Paras Naik)(Just a peek…stay tuned)
CLEO-III
• Made possible by CLEO-III RICH• Motivated by method for measuring “” using B±→ D0K; D0→K*K [Grossman, Ligeti, Sopher & others]
• Ingredient: Strong phase between D0→ and D0→ Exactly what this analysis measures Stay Tuned
S/(S+B) ~ 55% S ~ 400
m2() (GeV2)
0 1 2 3m2() (GeV2)
0 1 2 3m2() (GeV2)
0 1 2 3
M. Selen, CIPANP/03 36
CLEO-cCLEO-c
Summing UpSumming Up
There are many more on the way.
The next few years should be very exciting for those of us interested in charm physics!
Too many new charm results to do them all justice in 30 minutes !!
D** c etc.
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