Recent Results in Hadronic Charm Decays

1
Recent Results in Hadronic Charm Decays
Mats Selen, University of Illinois2003 CIPANP,
May 19-24, New York, NY
2
I will NOT talk about Dsp0

• Stay tuned for detailed experimental
  presentationsBaBar (Ray Cowan)CLEO (Jon
  Urheim) Belle (Tom Browder)plus a
  theoretical perspective from Harry Lipkin

3
The usual suspects
CDF
CLEO
Belle
FOCUS
BaBar
BES
4
Charmed Baryons
5
Phys.Lett.B52353-59,2001
Charm Baryon Lifetimes
Phys.Rev.Lett.88161801,2002
Phys.Lett.B541211-218,2002
Phys.Lett.B56141-48,2003
Thanks to Kevin Stenson for summary figure
6
Lc g Lppp-p0 (Steve Blusk)
CLEO-III
Phys. Rev.D67012001,2003
First Observation
7
X0c g pK-K-p (Basit Athar)
?0c?pKK?
148 18
Preliminary
CLEO-III
First branching ratio measurement of this
mode. (Made possible by CLEO-III RICH)
pKKp Mass (GeV/c2)
?0c? ? ?
77 13
Preliminary
?p Mass (GeV/c2)
8
?c0? ? -?
Preliminary
New ?c Mass Measurement
mass scale
80.510.8events
Preliminary
9
?c0? ? -?
Production cross-section xp spectrum
Preliminary
From fit to Petersonfragmentation function
Preliminary
10
Charmed Mesons
11
Charm Meson Lifetimes
Phys.Lett.B537192-200,2002
Thanks to Kevin Stenson for summary figure
12
CDF Huge charm physics potential

• Charm potential
• Trigger important
• Huge future potential

• Enormous production cross-section
• Secondary Vertex Trigger is working well!

450,000events
78,000events
13
DS - D Mass Difference
FERMILAB-PUB-03/048-E

• Charm potential
• Trigger important
• Huge future potential

CDF
14
D0 ? KK-, ??-
Preliminary

• Charm potential
• Trigger important
• Huge future potential

Preliminary
15
3453 111
D0 ? KK-, ??-
p-p
hep-ex/0212058
10830 148
K-K
105030 372
K-p
16
D? ??0 , K?0, KKs(Chul Gwon)
Preliminary
CLEO-II.V

• Unbinned maximum likelihood fit using FELIX.
• Fit variables M(D), xpD, cosqhelicity
• PDFs obtained from MC data

D?pp0
D?Kp0
D?KKS
17122
3421
27821
M(D) GeV
M(D) GeV
M(D) GeV
lt 0.0046 _at_ 90 CL
Preliminary
17
Isospin analyses using new D0?pp, KK numbers
CLEO-II.V
hep-ex/0212058
Preliminary
pp
KK
New FOCUS pp- , KK- old FOCUS KK0 PDG
New CLEO pp0 PDG
18
D0 ? K-K-K?, K-K?-?, ?-??-?
Preliminary
FOCUS Preliminary
PDG2002
19
D, DS ? 5-body Decays(Branching Ratios)
fppp-
hep-ex/0211056
1st obs.
p-pppp-
KK-ppp-
(inclusive ratios)
K-pppp-
KK-ppp-
FOCUS also has new resultson D ? 6-body decays !
20
KK-ppp-
K-pppp-
5-body Decays(Substructure)
(7 5 1)
(10 6 5)
NR
NR
hep-ex/0211056
(21 4 6)
(21 5 6)
Consistent with hypothesis that structure
dominated by quasi 2-body decays
K0p-pp
fp-pp
Lipkin Phys. Let. B 515, 81 (2001)
(30 4 1)
lt 3 _at_ 90CL
K-pr0p
K-Kr0p
Central value of a1 mass is outside phase-space,
but its wide (400 MeV).
(40 3 6)
(75 6 4)
K0r0p
fr0p
sum
sum
(corrected for unseen modes)
21
D0? K0K-?, K0K?- and K0KK-
hep-ex/0207089
Normalizing mode
11659 40
15279 129
805 35
2109 48
Errors are 3-5 times smallerthan previous
measurements
A Dalitz analysis was also done for each mode
22
D0? K0K-? Dalitz Analysis
hep-ex/0207089
23
D0? K0K?- Dalitz Analysis
hep-ex/0207089
24
D0? K0KK- Dalitz Analysis
hep-ex/0207089
25
D0?Ks?? (Mikhail Dubrovin)
Preliminary
CLEO-II.V

• Motivated by interest in KSp-p and KSK-K
  analyses.
• KSa0(980) seen in KSK-K
• but a0(980)???? is dominant
• First measurement of this BR

Preliminary
26
D0?Ks?? (Mikhail Dubrovin)
Preliminary
CLEO-II.V
KSa0(980) is dominant K(892)h is seen Something
else needed for good CL(but exactly what hard to
sort out) NR, KSa2(1320), KSa0(1450)kh,
K0(1430)h, K1(1410)h
Under investigation stay tuned !
27
2
D0? Ks?-? (David Asner)
S/(SB) 98 S 5300
Phys. Rev. Lett.89251802,2002
CLEO-II.V
m2(p-p) (GeV2)
Fit Fraction () (stat err shown)
K(892)p- 0.34 0.13
K(892)-p 65.7 1.3
K0r0 26.4 0.9
K0w 0.72 0.18
K0f0(980) 4.3 0.5
K0f2(1270) 0.27 0.15
K0f0(1370) 9.9 1.1
K0(1430)-p 7.3 0.7
K2(1430)-p 1.1 0.2
K(1680)-p 2.2 0.4
NR 0.9 0.4
1
0
0
3
2
1
m2(KSp)RS (GeV2)
28
D0? KSp-p
From Brian Meadows, Moriond/03

• 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!

29
D ? pp-? Dalitz
E791
Phys.Rev.Lett.86770-774,2001
Fit Frac. () Fit Frac. ()
r0(770)p 20.8 2.4 33.6 3.2 2.2
f0(980)p 7.4 1.4 6.2 1.3 0.4
f2(1270)p 6.3 1.9 19.4 2.5 0.4
f0(1370)p 10.7 3.1 2.3 1.5 0.8
r0(1450)p 22.6 3.7 0.7 0.7 0.3
Non-res 38.6 9.7 7.8 6.0 2.7
sp - 46.3 9.0 2.1
?2 254/162 138/162
Phase motion consistent with s(Method discussed
inPLB 550135-139,2002)
0 1 2
3
m2pp (GeV2)
30
D0??-??0(Charles Plager)
S/(SB) 80 S 1100
Preliminary
CLEO-II.V
m2(pp0) (GeV2)
Amplitude Phase Fit Fraction
rp- 1 (fixed) 0 (fixed) 76.51.84.8
r0p0 0.560.020.07 1033 23.91.84.6
r-p 0.650.030.04 -434 32.32.12.2
NR 1.030.170.31 77811 2.70.91.7
m2(pp-) (GeV2)
No contribution from s(500) at 1 level
0 1 2 3
0 1 2 3
m2(pp-) (GeV2)
m2(p-p0) (GeV2)
31
D ? K-p? Dalitz
Phys.Rev.Lett.89121801,2002
E791
Fit Frac. () Fit Frac. ()
K(892)p 13.8 0.5 12.3 1.0 0.9
K0 (1430)p 30.6 1.6 12.5 1.4 0.5
K2 (1430)p 0.4 0.1 0.5 0.1 0.2
K (1680)p 3.2 0.3 2.5 0.7 0.3
Non-res 90.9 2.6 13.0 5.8 4.4
kp - 47.8 12.1 5.3
?2 167/63 46/63
CLEO Dalitz analysisof D0 ? K-p?0 seesno
evidence for k.Phys. Rev.D63092001,2001
32
D ? KK-?, ??-? Dalitz
Stay TunedNew results expected later this year
33
s k from J/? decays
Preliminary BES results indicate significant
contributionfrom s and k in J/? ???? and J/?
?KK? respectively
Ning Wu (IHEP, Beijing) from talk given at
Hadron Spectroscopy. Tokyo, Feb/03
34
D0? Ks?0?0 (Scott Davis)(Just a peekstay tuned)
S/(SB) 70 S 700
CLEO-II.VIII
m2(p0p0) (GeV2)

• Complement KSp-p analyses
• Good place to search for low mass pp
• No r ??0?0 to get in the way!
• Fit seems to prefer presence of a broad scalar
  pp resonance (?)
• No unique solution using BWs.
• Also trying K-matrix approach.

m2(KSp0)RS (GeV2)
Not the only way to get a good fitmore work
needed
35
D0?K-K?0 (Paras Naik)(Just a peekstay tuned)
S/(SB) 55 S 400
CLEO-III

• Made possible by CLEO-III RICH
• Motivated by method for measuring g using
  B? D0K D0?KK Grossman, Ligeti, Sopher
  others
• Ingredient Strong phase between D0?KK-
  and D0?KK-
• ? Exactly what this analysis measures
• ? Stay Tuned

0 1 2 3
0 1 2 3
0 1 2 3
m2(K-p0) (GeV2)
m2(Kp0) (GeV2)
m2(K-K) (GeV2)
36
Summing Up
Too many new charm results to do them all justice
in 30 minutes !!
?c etc.
D

• There are many more on the way.
• The next few years should be very exciting for
  those of us interested in charm physics!