1 / 17

Hadronic B Decays related to QCD at Belle and BaBar

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 .

langer
Download Presentation

Hadronic B Decays related to QCD at Belle and BaBar

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Hadronic B Decays related to QCD at Belle and BaBar Jeri, M.C. ChangFU JEN CATHOLIC UNIVERSITY Moriond QCD 2010 March 15, 2010

  2. Luminosity at the B Factories Jeri M.C. CHANG- Hadronic B Decays at Belle and BaBar

  3. 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

  4. 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

  5. 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

  6. 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

  7. +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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. 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

  17. 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

More Related