1 / 22

Polarization fraction & time-dependent CP analysis of measured at Belle.

Polarization fraction & time-dependent CP analysis of measured at Belle. Kim Vervink. March 2008 – Geneva Swiss Physical Society – Annual meeting. Motivation. b  ccd transition. = CP eigenvalue. Motivation.

ashley
Download Presentation

Polarization fraction & time-dependent CP analysis of measured at Belle.

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. Polarization fraction & time-dependent CP analysis ofmeasured at Belle. Kim Vervink March 2008 – Geneva Swiss Physical Society – Annual meeting

  2. Motivation b  ccd transition = CP eigenvalue

  3. Motivation Similarity with the “golden” channel: First observation of mixing induced CP violation! • very clean measurement of sin2b • No hadronic contamination • No contamination from other phases Difference: : clean because “P/T” is estimated small in the SM. : clean because 1 CKM amplitude is dominant. The decay amplitude is CKM suppressed. Any New Physics in the penguins will right away show up, but overall branching fraction is small.

  4. Angular analysis

  5. History Branching fraction CP odd fraction and CP violation

  6. Luminosity Belle (10 Mar 08) All: ~ 778 fb-1 , Cont: ~ 68 fb-1 , Y(5S): ~24 fb-1 Belle + BaBar > 1 ab-1

  7. Results All preliminary…

  8. Extracting signal Show signal in: Signal events:

  9. Angular analysis Comparison with Babar:

  10. Decay rates at Belle Standard method (similar method used for ) 2 B-mesons are produced in a boosted frame tis measured from vertex positions B-mesons are entangled: flavor of B1 at time t2 is determined by B2 decay

  11. lifetime measurement B-meson lifetime. : background contribution.

  12. CP violation measurement Significance of CPV : 3.8 Comparison with Babar: Standard Model prediction in absence of penguin diagrams: Compatible with SM prediction.

  13. Summary • The Standard Model predicts a clean measurement of . • With a sample of 500 signal events we find: • Adfa • … with a significance of 3.8 A result compatible with the Standard Model. Kim Vervink

  14. Backup slides

More Related