1 M. Selen, CIPANP/03 Recent Results in Hadronic Charm Decays Mats Selen, University of Illinois 2003 CIPANP, May 19-24, New York, NY

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


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


The usual suspectsThe usual suspects


Charmed Baryons


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


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

Mats Selen

since D -> many pions = big, perhaps also true in baryons


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 **



cc00 ++

4291±93events

KKpp

80.5±10.8events

mass scale

456±23events

New c Mass Measurementprevious




cc00 ++

Production cross-section & xp spectrum:

From fit to Petersonfragmentation function




Charmed Mesons


Charm Meson LifetimesThanks to Kevin Stenson for summary figure

Phys.Lett.B537:192-200,2002


CDF: Huge charm physics potential

Enormous production cross-section

Secondary Vertex Trigger is working well!

Reconstructed withonline SVT tracks

450,000events

78,000events


DDSS++ - D - D++ Mass Difference Mass Difference

CDFCDF

FERMILAB-PUB-03/048-E


D0 K+K, +




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


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



< 0.0046 @ 90% CL


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


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(



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)


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)


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


D0 K0K+ Dalitz Analysis

BaBarBaBar

hep-ex/0207089


BaBarBaBar

D0 K0K+ Dalitz Analysis

hep-ex/0207089


BaBarBaBar

D0 K0K+K

Dalitz Analysis

hep-ex/0207089


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




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 !



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


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


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)


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



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


D+ Dalitz

Stay TunedNew results expected later this year


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


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


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


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.

Documents

1 M. Selen, CIPANP/03 Recent Results in Hadronic Charm Decays Mats Selen, University of Illinois 2003 CIPANP, May 19-24, New York, NY