1 / 10

BaBar’s First Steps

BaBar’s First Steps. Tim Adye Rutherford Appleton Laboratory Particle Physics Department Meeting 19th January 2001. Where did all the anti-matter go?. Nature treats matter and anti-matter identically So far , just one exception seen

ktapia
Download Presentation

BaBar’s First Steps

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. BaBar’s First Steps Tim Adye Rutherford Appleton Laboratory Particle Physics Department Meeting 19th January 2001 Tim Adye

  2. Where did all the anti-matter go? • Nature treats matter and anti-matter identically • So far, just one exception seen • Certain rare decays of the K-meson differ slightly between K and anti-K. • Discovered in 1964 • To understand it, we need another example • Should also be able to see the effect in B-meson decays • If this “CP Violation” is large enough, it could help explain why the Universe is made of just matter. • Maybe the antimatter decayed • Otherwise, how to explain where all the antimatter went? Tim Adye

  3. What are we looking for? We are are looking for a subtle effect in a rare(and difficult to identify) decay, so need to record the results of a large number of events. • Look for specific B-meson decays • 1 in 100,000 B-decays Tim Adye

  4. BaBar performance 26 24 Delivered 22 PEPII Delivered Luminosity 20 Total Recorded Luminosity Off-peak Recorded Luminosity 18 Recorded 16 14 Integrated Luminosity (fb-1) / million BB events 12 10 Earlier Expectation 8 6 4 2 0 6/1/99 7/1/99 8/1/99 9/1/99 1/1/00 2/1/00 4/1/00 5/1/00 6/1/00 7/1/00 8/1/00 9/1/00 3/1/00 10/1/99 11/1/99 12/1/99 10/1/00 11/1/00 Tim Adye

  5. B Factories • In four(good)days, we are now recording more than ARGUS did in 10 years! • BaBar and Belle have many more years to accumulate events (with increasing rate) * LEP I; similarly for other LEP experiments Tim Adye

  6. The BaBar Detector Tim Adye

  7. The BaBar Collaboration(quite a bit of it, anyway) Tim Adye

  8. What we do in PPD • We help ensure that BaBar can cope with all these events • Boda, Neil, and Stefy wrote/support a major component of the online system (Run Control) • Top-level control system for the detector operation • Tim manages the data exports throughout the collaboration in the US and Europe • Tim and Neil (with ITD) run UK Analysis centre • 4 TB of BaBar data on disk at RAL (6500 CD-ROMs, 2000 PC hard disks) • After SLAC, only RAL and Lyon have all the BaBar data • Neil produces simulated events on the ITD compute farm • Physics studies need more simulated data than real data • RAL contributes 10% (and growing) of the total Tim Adye

  9. What we do in PPD • And of course, we use all this data to do Physics (Gian, Stefy,…) ... Tim Adye

  10. Conclusion • BaBar’s first couple of years have been highly productive. • Potential to be the worlds’ best • First results presented at Osaka last July • First publication in a few weeks… • PPD has made a major contribution, especially in the data acquisition and development of a distributed computing analysis model. Tim Adye

More Related