1. B  VV and B  Baryons — a personal view
December 12, 2006, Nagoya

2. Part I: Comments on VV modes
Disclaimer
Part I: Comments on VV modes
Data vs Models
VT vs VV puzzle
No New Physics: Angular Study
Part II: the Emerging Baryonic modes
History: Discovery of p+p-K+
3-body > 2-body
Threshold Peaking !
Further Puzzle: Angular Correlations
K+ and c+c-K+
Two Body: Charmed vs Charmless
Future: Triple Products

3. Disclaimer
... you could talk about recent experimental/theoretical topics on the
charmless Baryonic decays.
The session also contains
B-> Ks Ks and other hadronic b-> d by Babar
B-> VV (under discussion) by Belle and Babar.
If you could include another topics related to these subjects,
that would be welcome, too.
To me, baryonic final states are the farthest away from CKM, as they
are more subject to hadronic effects, with dynamics not quite understood
yet. Further, although I am one of the people who initiated the direction
(even experimentally), I have not quite actively worked on it in past 2
years. If people like Hai-Yang Cheng, Chun-Khiang Chua, or Chao-Qiang
Geng, or Mahiko Suzuki are attending CKM, they may be more suitable for
this talk.

4. Polarization in Charmless VV Puzzle
Part I: Comments on VV modes
Polarization in Charmless VV Puzzle
Naïve Factorization :
Longitudinal fL = 1 – O(mV2/mb2)
BaBar 89M, PRL 91, (2003): Fit fL only, find ~ 0.5 !
Belle 86M, PRL 91, (2003): angular fit in transversity basis

5. Data

6. Models
yours truly

7. Heuristic/Drastic Model
On-shell b  s g: g is Transverse
b  s g ~ 3 x 10−4
b  s g ~ few x 10−3
10%
0.1% ?
B  K* g ~ 4 x 10−5
B  KT* fT ~ 5 x 10−6 b x g
min.
is “gg”
Simple String
Fragmentation
 Resonances
Complicated
Color Structure
August 17, ICHEP2004
George W.S. Hou (NTU)

8. Models
Problem with K*0r
Similar concept
a suppressed

9. Models
SCET (hep-ph/ ) : Annihilation (XA) factorizable, small, and real
Against,
including QCDF
Problem with K*0r
Similar concept
a suppressed

10. SCET, after all the work, throw up hand and adopt “Charming Penguin” ...
Does not give correct DCPV
Smaller B  K* F.F. ? e.g. A0 ~ 0.3 rather than (hep-ph/ )
Models
At least within standard framework
Against,
including QCDF
Hadronic
Problem with K*0r
Similar concept
LD Rescattering (inelastic FSI): selects only a small subset of
possible inelastic processes;
unknown “scale” for effective coupling
a suppressed

11. Data
Smaller B  K* F.F. ?
Pure P
Check K*K* modes

12. VT vs VV puzzle
hep-ex/

13. No New Physics: Angular Study
Complete fit following London+Sinha2 fL f‖ f⊥
Hadronic
Evidence for
FSI phase
CP conserv.
Triple Products
No indication for NP

14. Part II: the Emerging Baryonic modes
Baryons from Meson Decay — Only B !

15. Minzu Wang finished some R&D for ...
History: Discovery of p+p-K+
Spring 2001
Minzu Wang finished some R&D for ...
My advice: As late starter, work on some project that is not (yet) frontline.
(convenor)
Suggest: Rare Baryonic, both 2- and 3-body
“I can’t predict when/where they will emerge, but they will,
and
I expect 3-body > 2-body.”
Reported Fall 2001 !
How could I be so sure?
“We point out new ways to search for charmless baryonic B decays and suggest that enhanced baryon production is favored by reduced energy release on the baryon side.”
WSH & Soni, PRL’01 (hep-ph/ )

16. (we were congratulated by Russian colleagues
Anecdote: Kpp  Khh
Powerful new Dalitz plot to scoop up
3-body and quasi-2-body modes.
Ironically, a CLEO leftover:
h = p+, K+, but not p+
But nobody thought of it ...
(we were congratulated by Russian colleagues

17. B+ → p+p-K+ and charmless baryonic
PRL 88, (2002)
A new class of B decays dominated (so far) by Belle
K+p+p-
Threshold peaking generic
[predicted by Chua, WSH, Tsai, PLB’02
for B  rp-n from
factorization  baryon form factor
Half a dozen modes observed
— 2-body still not observed
Search for pentaquark Θ+(+), Glueball
— Not seen, limits set
hep-ph/
pLg

18. ARGUS’87 vs. CLEO’88 Exp false alarm Grand History 1987: ARGUS ...
1988 CLEO refute
Exp false alarm
ARGUS 1988
PLB209(1988)119
ppp(p)
~ 5x10-4 !!
CLEO 1988
PRL62(1989)8
ppp(p)
< 1.4 (2.9)x10-4

19. 2-body Charmless Baryonic Modes Very Rare (≪ 10-5 of Mesonic)
Grand History
1987: ARGUS ...
1988 CLEO refute
1997: first exclusive measurement of BcpX (X= , ) by CLEO
One thing
struck me:
Phys. Rev.D59:111101,1999
2-body Charmless Baryonic Modes Very Rare (≪ 10-5 of Mesonic)

20. Grand History 1987: ARGUS ... 1988 CLEO refute
1997: first exclusive measurement of BcpX (X= , ) by CLEO
2000: first observation of B  D*p-n by CLEO

21. Probably Only Person to Notice This Slide at ICHEP2000
Dave Cinabro at ICHEP2000
[CLEO Spokesperson]
I knew worker, Tony Rubiera,
who had graduated and left;
So, communicated further with
advisor (J. Yelton) at Florida.
Phys.Rev.Lett. 86 (2001) 2732

22. “enhanced baryon production is favored by reduced energy release”
Grand History
1987: ARGUS ...
1988 CLEO refute
1997: first exclusive measurement of BcpX (X= , ) by CLEO
2000: first observation of B  D*p-n by CLEO
WSH & Soni: “Pathways to Rare Baryonic B Decays”
“enhanced baryon production is
favored by reduced energy release”

23. Grand History 1987: ARGUS ... 1988 CLEO refute
1997: first exclusive measurement of BcpX (X= , ) by CLEO
2000: first observation of B  D*p-n by CLEO
WSH & Soni: “Pathways to Rare Baryonic B Decays”
2001: first observation of charmless B+ ppK+ by Belle
Chua, WSH & Tsai: “Prediction” for Threshold Enhancement
hep-ph/

24. II. Possible Dynamics of Underlying 3-body
CLEO’01:
Factorized Currents/Current Produced /Isospin Relation
Belle’02: and
Extend Idea … Seems to Work
Threshold Peaking
Factorization in 3-body ?
&
r, p
Chua, WSH, Tsai, PRD’02
hep-ph/
Vector Current gives 60% & Threshold Enhancement
hep-ph/ , to appear PRD
in preparation
hep-ph/
25 July 2002, ICHEP
George W.S. Hou

25. Grand History 1987: ARGUS ... 1988 CLEO refute
1997: first exclusive measurement of BcpX (X= , ) by CLEO
2000: first observation of B  D*p-n by CLEO
WSH & Soni: “Pathways to Rare Baryonic B Decays”
2001: first observation of charmless B+ ppK+ by Belle
Chua, WSH & Tsai: “Prediction” for Threshold Enhancement
2002: observation of cpX (X=,) by Belle, CLEO, D(*)0pp by Belle
2003: first observation of 2-body decay: B0 cp (Belle)
first evidence of B+ J/p (BaBar)
2004: first observation of B+ p by Belle
2005: Doubly charmed baryon modes B cc, ccK by Belle

26. reduced energy release ...
Threshold Peaking
Low Mass
bsg MC
pΛgSignal
threshold peaking
String breaking g s b
Understood b s
Not Low Mass
Peaking for hadronic
less understood
reduced energy release ...

27. Hai-Yang Cheng, talk at Capri, 5/06
Rosner; Suzuki

28. B+ΛΛK+ 140 fb-1 cf. ffK First observation of bs s s baryonic decayg
b s s
cf. ffK
140 fb-1
threshold peaking
First observation of bs s s
baryonic decay
Signal Yield in 2D fit: 19.9
Efficiency: 4.0%-6.9%
Statistical Significance: 7.4σ
BF:( ± 0.38) x 10-6
First Charmless B decay with two Λ!
Threshold enhancement again.
Compliment to BφK(*) (bsss penguin)
PRL 93,211801, 2004

29. hc  ff, LL: Study CPV in 3-body with hc width
Observation of ηc Λ Λ
hep-ex/
Ratio for baryon quark-diquark model check
hc  ff, LL: Study CPV in 3-body with hc width
ffK: Hazumi hep-ph/

30. B+c+c-K+ BF(B+c+c-K+ ) = (6.5 ± 1.1 ± 3.4) × 10-4
hep-ex/ , to appear in PRL
Unexpected large rate
considering the limited
phase sapce
Threshold effect?
c+ pK-π+ signal
BF(B+c+c-K+ ) = ( ± 1.1 ± 3.4) × 10-4
+1.0
-0.9

31. Observation of B cc B+ c0c+ B0 c-c+ hep-ex/0510074, to appear
PRD(RC)
B+ c0c+
B0 c-c+
CKM(cc)=VcbVcs* <-> CKM(cp)=VcbVud*
Enhancement for smaller Q ?
c π 1%
cc  >> cp  10-5

32. A new class of charmless B decays dominated (so far) by Belle
PRL 88, (2002)
K+p+p-
Threshold peaking generic
Angular correlation of K- & p a puzzle
Half a dozen modes observed
pLg
2-body still not observed
pp < 10 -7

33. Part I: Comments on VV modes
Disclaimer
Part I: Comments on VV modes
Data vs Models
VT vs VV puzzle
No New Physics: Angular Study
Part II: the Emerging Baryonic modes
History: Discovery of p+p-K+
3-body > 2-body
Threshold Peaking !
Further Puzzle: Angular Correlations
K+ and c+c-K+
Two Body: Charmed vs Charmless
Future: Triple Products