Baryonic decays of B mesons. H.Kichimi, June28-July3, 2004 1 Baryonic decays of B mesons H. Kichimi Representing the Belle collaboration BEACH June28-July3,

1 Baryonic decays of B mesons. H.Kichimi, June28-July3, 2004Baryonic decays of B mesons. H.Kichimi, June28-July3, 2004

Baryonic decays of B Baryonic decays of B mesonsmesons

H. KichimiH. KichimiRepresenting the Belle collaborationRepresenting the Belle collaboration

BEACH June28-July3, 2004BEACH June28-July3, 2004IIT, ChicagoIIT, Chicago


Large b-quark mass Large b-quark mass ＆＆ CKM matrix elements CKM matrix elements Large variety in B meson decaysLarge variety in B meson decays b b c W c W--, b , b u W u W--, b , b s qq, b s qq, b d qq d qq Hadronizations into mesons and baryonsHadronizations into mesons and baryons CP and CKM studies in mesonic decaysCP and CKM studies in mesonic decays New particles X(3872) and DNew particles X(3872) and DsJsJ

Baryonic BFs are large, however not well studied yet.Baryonic BFs are large, however not well studied yet. BFs of exclusive baryonic decaysBFs of exclusive baryonic decays Structures in di-baryonsStructures in di-baryons 　　 Exotic quark states ( pentaquark searches)Exotic quark states ( pentaquark searches) CP, T and CKM studies in baryonic decays CP, T and CKM studies in baryonic decays

B meson decaysB meson decays

Recent results from Belle and Babar are presented.Recent results from Belle and Babar are presented.


~1 km in diameter

/ KL detection 14/15 lyr. RPC+Fe

Central Drift Chamber small cell +He/C2H5

CsI(Tl) 16X0

Aerogel Cherenkov cnt. n=1.015~1.030

Si vtx. det. 3 lyr. DSSD

TOF conter

SC solenoid 1.5T

8 GeV e-

3.5 GeV e+

Belle detectorBelle detector

8 GeV e8 GeV e-- x 3.5 GeV e x 3.5 GeV e++

@ 1.2A x 1.6A@ 1.2A x 1.6ALLpeakpeak = 1.39 x 10 = 1.39 x 1034 34 secsec-1-1cmcm-2 -2 ( June 3 )( June 3 )

Mt. Tsukuba

KEKBBelle

KEKB and the Belle detector

400 members400 members59 institutes59 institutes13 countries13 countries

Belle collaborationBelle collaboration


PEP-II and the BaBar detector

9 GeV e- x 3 GeV e+

@ 1.5A x 2.3ALpeak = 0.92 x 1034 sec-1cm-2

PEP-II

BaBar


Luminosity competition

KEKB 280 fb-1

PEPII 220as of June 22

KEKB monthly luminosity0.94fb-1/day 22 fb-1/month123 fb-1/year

This report is based on the data taken by July 2003 BaBar 124 fb-1 Belle 150 fb-1 July2003

Integrated luminosity (logged)

KEKB : 1.392 x 10 34

( June3)PEP-II: 0.9213x 10 34 (May21)

Peak luminosity history


Contents of this talk

1.1. Charmfull baryonic B decaysCharmfull baryonic B decays b b c (W c (W--) Tree ) Tree BB00cc

+ + p p BB--cc

+ + p p

BB00cc+ + p p

BB00D D 0(*)0(*) p p p p　　 BF and di-baryon massBF and di-baryon mass2. Charmless baryonic B decays2. Charmless baryonic B decays b b s (qq) Penguin s (qq) Penguin b b u (W u (W--) Tree) Tree BF and di-baryon massBF and di-baryon mass3. Searches for pentaquarks 3. Searches for pentaquarks

W W b b u u u c u c

d sd s

ggb b s (d) s (d) u d s cu d s c

u d s cu d s c

b b c c u c u c

d sd s

W W


Charged track momentum 　　　　　　　 & IP, Vee-vertex and B-vertex Si-VTX & CDCParticle ID/K/proton CDC/ACC/TOF (Belle) 　　 DIRC (BaBar) 　 and KL

0 multi-layers of RPC + Fe e and CsI(Tl) calorimeters

B-signal selection 1

B-event-shape parameter to suppress continuum background Fox-Wolfram moments, costhrust or Fisher discriminant of those prms

Energy difference : E = EB – Ebeam ~ 10 MeV

Beam constrained B mass : Mbc = Ebeam2 – pB

2

B-B from (4S) at 10.580 GeV/c2 in the CMS

~ 3 MeV/c2

4-vector measurement

B-signal selection


E = EE = EBB - E - Ebeambeam

MMbcbc= E= Ebeambeam22 – p – pBB

22

140 fb140 fb-1-1BB00 cc

++ p p ++ --

Single Gaussian plusSingle Gaussian plusARGUS functionARGUS function

Double Gaussian plusDouble Gaussian plusLinear bkgndLinear bkgnd

M( M( cc++ p p ) mass ) mass

B-signal box |E|<30 MeV Mbc>5.27GeV/c2

DataData

~ 3 MeV/c~ 3 MeV/c22

B-signal selection 2

Mass window ±14MeV/c2

569±39


B0c+p

Br = ( 2.19 Br = ( 2.19 ±±0.320.32±±0.57 0.57 ) x 10) x 10- 5- 5

+0.56+0.56- 0.49- 0.49

Stat. Sys. Error of Br (c+)

First observation of baryonic 2-body decay

19.6+5.0- 4.4

Belle : PRL 90, 121802 (2003) 78 fb-1

b b c c dd

u u uuu u

d d d d

BB00 cc

pp

1. Charmfull decays b b c c u u

d d

W W


B0 D(*)0 p p　

D0 K- +

D0 K- + - +

D0 K- +

BB00 D D00pppp BB00 D D0* 0* pppp

Belle: PRL 8989, 151802 (2002) 29.4 fb-1

33.6evnts

24.2evnts

34.2evnts

8.9

5.6

5.1

total 19.3 evnts 5.6

D*0 D00

b b c c u u

d d

W W


B0 D(*)0 p p　Belle: PRL 8989, 151802 (2002) 29.4 fb-1

1.18±0.15±1.18±0.15±0.160.16

1.20 1.20 ±0.21±0.21

BB++ D D++ pppp

< 0.15 x < 0.15 x 1010-4-4

BB++ D* D*++ pppp

< 0.15 x < 0.15 x 1010-4-4

BB00 D D00pppp

BB00 D* D*00pppp +0.33+0.33- 0.29- 0.29

x10x10- 4- 4

UL@90%CUL@90%CLL

These decays are not allowed by bc transitions

( B yields by E fit )

b b c c u u

d d

W W


BB-- cc++ p p --

233±1233±19 9 signalsignalss

CC(2455)(2455)00

CC(2520)(2520)00

sidebansidebandd

32.832.8

12.12.22

+ 6.6+ 6.6 - 5.9- 5.9

+ 5.6+ 5.6 - 4.9- 4.9

Belle: new results 140 fbBelle: new results 140 fb-1 -1

BB--cc++pp-- 19.8±1.919.8±1.9

BB--cc00

2455 2455

pp 3.64 3.64

BB--cc00

2520 2520

pp 1.19 1.19

BF x 10BF x 10-5-5

+0.73+0.73- 0.66- 0.66+0.55+0.55- 0.48- 0.48

~ 25% of the total (c+ p -) B

F

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Observation of a new 2-body decay

( as of Moriond QCD2004 )

b b c c u u

d d

W W


(c+p) mass

CC++p)p)

M(c+ -)>2.6 & M(p-) >1.6GeV/c2

to remove c(2455/2520) & (1232)

B signals by E fit for each mass bin

B- c+ p - M(c

+p) structure

Br = ( 3.79 ) x 10 - 5

BW = 0.15±0.05

Mass = 3.32±0.02

6.1 significance

CC00CC

++--))

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75±17evnts

( as of Moriond QCD2004 )

Phase spacefunction

+0.75- 0.71


MC helicity 2 /ndSolid line : 0 0.97Dashed line : 1 1.58

BB-- cc++ p p --

by by E fit for each cosE fit for each cos bin bin

Helicity distribution 　 of the (c+p) system ( <3.6GeV/c2 )

data: dotsMC : histograms

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yc+

(c

+p) direc. B - at rest

Helicity angle

p

c+p) at rest


B0 c+ p - -

cc++++(2455)(2455) cc

00(2455)(2455)

cc++++(2520)(2520) cc

00(2520)(2520)

M(M(cc++))

Intermediate 3-body decaysIntermediate 3-body decays Belle 140 fbBelle 140 fb-1-1

BB00 cc++ p p

10.44±0.71 ±1.25 10.44±0.71 ±1.25 ±2.71±2.71(*1)(*1)

BB00 c c (2455)(2455) ++++ p p

1.25±0.21 ±0.15 1.25±0.21 ±0.15 ±0.33±0.33

BB00 c c (2455)(2455) 00

p p

1.11±0.20 ±0.13 1.11±0.20 ±0.13 ±0.29±0.29

BB00 c c (2520)(2520) ++++ p p

1.04±0.23 ±0.13 1.04±0.23 ±0.13 ±0.27±0.27

BB00 c c (2520)(2520) 00

p p

0.44±0.16 ±0.05 0.44±0.16 ±0.05 ±0.11±0.11

44.7±7.6 40.4±7.1

58.4±13.0 25.1±9.0

M(M(cc++)+c.c.)+c.c.

M(M(cc++)+c.c.)+c.c.

(*1) total BFPre

limin

ary

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x 10 - 4


BB0 0 ( (cc++p) p) --

CC++/0++/0 (2455/2520) excluded (2455/2520) excluded

BB- - ( (cc++p) p) --

B Signals byB Signals byE fitE fit

consistent with 4-body consistent with 4-body MC phase space, MC phase space, however fine structures however fine structures ?

MC 4-body phase spaceMC 4-body phase space

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M(c+p) structure in 3, 4 body decays


BFs for Charmfull decays

BB00 cc++ p p

10.44±0.71 ±1.25 10.44±0.71 ±1.25 ±2.71±2.71(*1)(*1)

BB00 c c (2455)(2455) ++++

p p

1.25±0.21 ±0.15 1.25±0.21 ±0.15 ±0.33±0.33

BB00 c c (2455)(2455) 00

p p

1.11±0.20 ±0.13 1.11±0.20 ±0.13 ±0.29±0.29

BB00 c c (2520)(2520) ++++

p p

1.04±0.23 ±0.13 1.04±0.23 ±0.13 ±0.27±0.27

BB00 c c (2520)(2520) 00

p p

0.44±0.16 ±0.05 0.44±0.16 ±0.05 ±0.11±0.11 ULUL

BF x 10 BF x 10 - 4- 4

BB- - cc++p p 1.98 ± 0.19 1.98 ± 0.19

BB- - cc (2455) (2455)00 pp 0.36 ± 0.070.36 ± 0.07

BB- - cc (2520)(2520)

00 pp 0.12 ± 0.060.12 ± 0.06

BB00 cc+ + p p 0.22 ±0.03± 0.22 ±0.03±

0.060.06

4-body decay4-body decay

3-body decays3-body decays

2-body decays2-body decays+0.06+0.06- 0.05- 0.05

(*1) total Br.

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Strong suppression of lower multiplicity decaysBF(2-body)<<BF(3-body)<<BF(4-body) ~1/10 : 1 : ~10

Stat, sys and error in BF(c+ p K- )

(PRL90)

Belle new 140 fbBelle new 140 fb-1-1


B0 p -

BB00 p p --

Peaked at threshold

Belle: PRL 90, 201802 (2003) 78 fb-1

5.8

39.2 evnts

MC Phase SpaceMC Phase Space

B0 p - ( 3.97 ±0.56 ) ( 3.97 ±0.56 ) x10x10-6-6

B0 p K- < 8.2 x 10-7 @90%CL

B0 p 0 - < 3.8 x 10-6 @90%CL

+1.00+1.00- 0.80- 0.80

ggb b s s u d u d

u d u d

2. Charmless decays


BB++ p p p p KK++

4.89 ±0.54

BB++ p p p p ++ 1.76 ±0.21

BB00 p p K p p K00 1.56 ±0.19

BB++ p p K p p K *+*+

6.7

BB+ + pp pp++

BBo o ppK ppKss00 BB+ + ppK ppK*+*+

BB+ + ppK ppK++

B+ p p h+

MC phase spaceMC phase space

BF x10-6 +0.59- 0.55+0.42- 0.37+0.52- 0.49+2.4- 2.0

+0.9- 1.1

Belle: PRL 92, 131801 (2004) 78 fb-1

PRL 88, 181803(2002) 29 fb -1

(1)Peaked at threshold(2) BF( pp K ) > BF( pp ) consistent with BF(K) > BF()(3) BF( pp K0 ) < BF( pp K+ ) differe

nt from mesonic cases

(M(Mpppp<2.85GeV/c<2.85GeV/c2 2 to exclude charm)to exclude charm)

ggb b s, ds, d u d u d

u d u d

W W b b u u u u

d d

95.4 evnts15.3

37.46.7

11.35.1

14.56.0

First observation in baryonic decay


B+ K+

B+

22.9 evnts (M<2.85)

threshold peaking

Charmonium excluded

B+

B++

2.91 ±0.38

B++

< 2.8 < 2.8 @90%CL@90%CL

+0.90- 0.70

BF x 10-6

MC phase space

Belle New 140fb-1

no signal

ggb b s s s s

s s

+5.8- 4.8

7.4

First observation of bs s s decayHep-ex/0406068 submitted to PRL


B+ p p K+

BaBar 80 fb -1

ggb b ss u d u d

u d u d

Belle: (4.89 　 ±0.54)x10-6

(Mpp<2.85GeV/c2)

+0.59- 0.55　　　

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B0 p pBaBar : PRD69, 091503(R) (2004)

Dotted curves : signals for Br=1x10Dotted curves : signals for Br=1x10-6-6

< 2.7 x 10 < 2.7 x 10 -7-7 for B for B00p pp p

BaBar UL@ 90% CL 80 fbBaBar UL@ 90% CL 80 fb-1-1

b b u u dd

u u uuu u

d d d d

BB00

pp

pp

no evidence yet

W W b b u u u u

d d

Br = ( 2.19 Br = ( 2.19 ±±0.320.32±±0.57 0.57 ) x 10 ) x 10 - 5- 5

+0.56+0.56- 0.49- 0.49

2. B0c+ p (Belle)

Belle : PRD65, 091103(R) (2002) Belle : PRD65, 091103(R) (2002)

29 fb29 fb-1-1 Belle UL @ 90% CLBelle UL @ 90% CL < 1.2 x 10 < 1.2 x 10 -6-6 for pp for pp

< 1.0 x 10 < 1.0 x 10 -6-6 for for < 2.2 x 10 < 2.2 x 10 -6-6 for p for p

1. Strong suppression relative to 3-body decay by ~1/10, as observed in bc.

Br = ( Br = ( 1.76 ±0.21 ) ) x 10 x 10 - 6- 6

1. B1. B+ + p p p p ++ (Belle) (Belle)+0.42- 0.37

2. Consistent with the ratio of Vub/Vcb.


ModeMode BaBarBaBar BelleBelle typetype

BB00 p p p p < 0.27 < 0.27 < 1.2< 1.2 bb u u d u u d

BB00 < 1.0< 1.0 bb d s s d s s

BB00 p p < 2.2< 2.2 bb s u u s u u

BB00 p p -- 3.97 3.97 ±0.56±0.56

b b s u u s u u

BB00 p p -- < 3.8< 3.8 b b s u u s u u

BB00 p p K K --

< 8.2< 8.2 b b d s s d s s

BB++ p p K p p K ++ 5.7± 5.7± 0.7±0.4 0.7±0.4

4.89 4.89 ±0.54±0.54

b b s u u, s d s u u, s d dd

BB++ p p K p p K *+*+

6.7 6.7 b b s u u, s d s u u, s d d d

BB00 p p K p p K00 1.56 1.56 ±0.19±0.19

b b s u u, s d s u u, s d d d

BB00 p p K p p K*0*0 < 7.6< 7.6 b b s u u, s d s u u, s d dd

BB++ p p p p ++ 1.76 1.76 ±0.21±0.21

b b u u d u u d

BB++ KK++ 2.91 2.91 ±0.36±0.36

b b s s s s s s

BB++ ++ < 2.8< 2.8 b b d s s d s s

BB00 J/ J/ pp

< 26< 26 < 41< 41 b b c c s c c s

BB00 J/ J/ p p pp

< 1.9< 1.9 b b c c d c c d

x10 x10 - -

66

+1.00+1.00- 0.08- 0.08

+0.59+0.59- 0.55- 0.55+0.9+0.9- 1.1- 1.1

+2.4+2.4- 2.0- 2.0

+0.52+0.52- 0.49- 0.49

+0.42+0.42- 0.37- 0.37+0.90+0.90- 0.70- 0.70

BFs for Charmless DecaysBFs for Charmless Decays

M(pp) < 2.85GeV M(pp) < 2.85GeV to remove charmto remove charm

UL @ 90% CLUL @ 90% CL

2-bodys2-bodys

3-bodys3-bodys

New


Searches for pentaquarksSearches for pentaquarksBaBar : Inclusive searches for +, 5and N5

Belle searches will be reported in PQ04.

++(1540) (1540) p Ks p Ks

p Ks p Ks


BaBar-1 : Inclusive search for +(1540) Ks p

1.6 – 1.8 GeV/c2

c+(2285)

1.44 – 1.60 GeV/c2

+(1540)++ Ks p Ks p

1.8 – 3.0 GeV/c2

c+ signal only

Ks pKs p Pre

limin

ary

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y(M) ~ 2MeV/c2

for all p* with eff. ~16%

Ks from I.P. MKs ±10MeV/c2 eff. ~26%

M(Ks p)

Mc+) =5~7MeV/c2 (FWHM) Data-MC in good agreement

No evidence

All mass region : 1.4 - 5.4 GeV/c2

98K evnts in c+ region

123 fb-1


mm

mm

No signals observed

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c0

(2470)

0 (1532)

124 fb-1

, p : 258K, p : 8.7K

: 16.9K c

: 4.2K

BaBar-2 Inclusive searches for 5and N5

Hadrons 556M evnts


mK+

mKs

mK-

55KsKs

55KsKs

No signals observed

124 fb-1

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- (1672)

C0

(2470)

55KK++

C+

(2285)

N50

N50

c : 615.7K : 6357.7

(evnts)

Inclusive searches for 5and N5 continued

p : 10 x 10+6

Ks : 2 x 10+6


SummarySummary

1. A low mass (1. A low mass (cc++p) structure in Bp) structure in B- - cc

+ + p p -- mass = 3.32±0.02 GeV/cmass = 3.32±0.02 GeV/c22 BW BW = 0.15 ± 0.05 Ge= 0.15 ± 0.05 Ge

V/cV/c22

BF (BF (cc++p structure) ~ 20% of the 3-body decayp structure) ~ 20% of the 3-body decay

2. BFs for 2, 3 and 4-body decays are measured precis2. BFs for 2, 3 and 4-body decays are measured precisely.ely.

Strong suppression of lower multiplicity decays.Strong suppression of lower multiplicity decays. BF(2-body) << BF(3-body) << BF(4-body) BF(2-body) << BF(3-body) << BF(4-body) 3. b3. b s s s : B s s s : B++KK+ + is observed. is observed. bbu u d : Bu u d : B++p p p p ++

4. Threshold peaking behavior of (pp) (p4. Threshold peaking behavior of (pp) (p and ( and (massesmassesin charmless 3-body decays.in charmless 3-body decays.5. Searches for pentaquarks at Belle and BaBar.5. Searches for pentaquarks at Belle and BaBar. No positive evidence. ULs will be reported at PQ04 .No positive evidence. ULs will be reported at PQ04 .

Documents

Baryonic decays of B mesons. H.Kichimi, June28-July3, 2004 1 Baryonic decays of B mesons H. Kichimi Representing the Belle collaboration BEACH June28-July3,