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Hadronic B Decays related to QCD at Belle and BaBar. Jeri, M.C. Chang FU JEN CATHOLIC UNIVERSITY Moriond QCD 2010 March 15, 2010. Luminosity at the B Factories. Taking shifts @ Belle control room. Belle stopped taking data since the end of December in 2009 .

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Hadronic b decays related to qcd at belle and babar

Hadronic B Decays related to QCD at Belle and BaBar

Jeri, M.C. ChangFU JEN CATHOLIC UNIVERSITY

Moriond QCD 2010 March 15, 2010


Luminosity at the b factories
Luminosity at the B Factories

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


Taking shifts @ belle control room
Taking shifts @ Belle control room

  • Belle stopped taking data since the end of December in 2009.

  • Final Belle running will be in Spring, 2010. (~1 month)

  • Belle will be upgraded to Belle-II. (~3 years)

2009.12.18

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


Outline

657M

PRD 80: 051103(R), 2009

232M

PRL 97, 201801, 2006

383M

PRL 100, 081801, 2008

465M

PRD 80, 092007, 2009

657M

arXiv:1001.4595

Outline

  • Baryonic B Decays

  • B decays to VV mode

  • Hadronic penguins

    • Final States with η’ and η

#BB-bar Events

657M

PRD 80: 111103(R), 2009

preliminary

467M

657M

arXiv:0910.4751, 2010

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


Baryonic b decays
Baryonic B Decays

  • First 4-body charmless baryonic decay has been observed

  • Motivation:

  • Br(4-body)> Br(3-body)> Br(2-body)

b→c tree diagram

First Observation

b→s penguin or b →u tree diagrams

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


Baryonic b decays1
Baryonic B Decays

  • Threshold enhancement is same for all baryonic decays.

605fb-1

PRD 80, 111103(R) (2009)

Fit with threshold function

657M

PRD 79, 052006 (2009)

PRD 76, 052004 (2007)

PRL 100, 251801 (2008)

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


Baryonic b decays2

+0.88

-0.84

BF( ) = (5.92 ± 0.69)x10-6

+0.67

-0.64

BF( ) = (4.78 ± 0.60)x10-6

+0.77

-0.72

BF( ) = (2.03 ± 0.27)x10-6

Baryonic B Decays

605fb-1

PRD 80: 111103(R) 2009

ρ0

f2(1270)

Red line:

Purple:

Green:

Blue: background

Black: total

Significance = 9.1

Significance = 9.5

Significance = 3

Intermediate 3-body decay

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


B decays to vv mode
B decays to VV mode

  • Motivation:

    • Measurements of fL in rare B decays to VV, such as , have revealed an unexpectedly large fraction of transverse polarization. (fL ~0.5)

    • This implies that non-factorizable contributions to the decay amplitude play a significant role.

    • Further information about these effects can be obtained with Br and fL in (also b → s penguin-dominated).

BABAR, PRL 93, 231804 (2004); Belle, PRL 94, 221804 (2005).

polarization puzzle

BABAR, PRL 97, 201801, 2006

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


B decays to vv mode1

232M

PRL 97, 201801, 2006

0

657M

PRD 80: 051103(R), 2009

B decays to VV mode

Observation?

?

fL~0.57

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


B decays to vv mode2

Observation?

B decays to VV mode

383M

PRL 100, 081801, 2008

657M

arXiv:1001.4595, 2010

submitted to PRD(R)

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


B decays to vv mode3
B decays to VV mode

Preliminary

657M

383M

arXiv:1001.4595, 2010

submitted to PRD(R)

PRL 100, 081801, 2008

?

9.1

8.1

0.35

0.30

fL~0.80

9.7

8.5

2.8

2.2

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


B decays to vv mode4
B decays to VV mode

465M

PRD 80, 092007, 2009

Observation

fL=0.31±0.22 ± 0.10

Showing the agreement with the theoretical expectations

H.-Y. Cheng and K.-C. Yang, Phys. Rev. D 78, 094001 (2008).

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


Hadronic penguins exclusive
Hadronic penguins: Exclusive

K*(892),(Kp)*0,K2*(1430)

ρ0,f0

467M BB

Preliminary

Preliminary

Observation

Observation

K2*(1430)(0,+)

ρ+

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


Hadronic penguins inclusive

arXiv:0910.4751, 2010

Hadronic penguins: Inclusive

657M BB

Sum of exclusive modes

γ γ

Preliminary

Knπ(n≦4,np0 ≦1)

Preliminary

Black errors –statistical only

Red errors –includes fitting and background systematics.

K*(892)

K*(1430)

Unknown?

-----: signal

-----: BB background

-----: combinatorial background

Signal yield (MXs> 1.0 GeV/c2) =

17.6σ statistical significance

Mbc is fitted in bins of Xs mass.

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


Hadronic penguins inclusive1
Hadronic penguins: Inclusive

BaBar PRL 93, 061801, 2004

657M BB

arXiv:0910.4751, 2010

Black –statistical error only

Blue –includes systematic errors other than model error

Red –includes systematic and model errors

Preliminary

Unknown?

Belle partial branching fraction for Xs mass range 0.4 –2.6 GeV/c2:

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


Summary
Summary

  • Baryonic B decays

    • Threshold enhancement exists in the invariant mass of two baryons. eg.

    • BR(4-body)>BR(3-body)>BR(2-body), for both charm and charmless baryonic mode.

  • B→VV mode

    • Belle and BaBar knew their inconsistency modes.

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


Summary1
Summary

  • Hadronic penguins

    • Exclusive η’ modes

      • Observations of

      • Unexpected enhancements of K2*(1430) over K*(892)

    • Inclusive Xs η mode

      • Belle partial branching fraction for Xs mass range 0.4 –2.6 GeV/c2:

      • Both Xs η and Xs η’ contains signals beyond the known K*(892,1430).

Preliminary

Preliminary

Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar


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