1 / 30

High-mass resonance with K* data

High-mass resonance with K* data. Hyosang Lee Pusan National University 2008/05/01 LEPS Collaboration Meeting. Motivation. Standard cut. Cut value. ntrk ≠ 2 Eg = 0 || fntag = 0 Zvtx < -1100 || -870<Zvtx noutl > 6 pm = 0 ithtofhit <= 0 | ytof – tofdiff | >= 90

joseph-atkinson
Télécharger la présentation

High-mass resonance with K* data

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. High-mass resonancewith K* data Hyosang Lee Pusan National University 2008/05/01 LEPS Collaboration Meeting

  2. Motivation

  3. Standard cut Cut value • ntrk ≠ 2 • Eg = 0 || fntag = 0 • Zvtx < -1100 || -870<Zvtx • noutl > 6 • pm = 0 • ithtofhit <= 0 • | ytof – tofdiff | >= 90 • | itof – tofid | >= 2 • prbchi2 <= 0.02 Zvtx

  4. K+ selection cut Cut value p(GeV/c) p(GeV/c) m/q(GeV/c2) m/q(GeV/c2)

  5. MM(g,K+)X K* Data sample MM(g,K+)X MM(g,K+)p+X MM(g,K+)p+X MM(g,K+)K-X MM(g,K+)pX

  6. high-mass resonance K* Data sample L(1670) S01**** S(1670) D13****

  7. Missing mass K+p+ events MM(g,K+)X MM(g,K+p+)X

  8. Missing mass K+p+ events MM(g,K+p+)X MM(g,K+)X

  9. Y*Sp K+p+ events LS-p+ Y*S-p+ MM(g,K+)X MM(g,K+p+)X

  10. Y*Sp K+p+ events S S(1385) Y*S-p+ Y*S(1385)-p+ MM(g,K+p+)X MM(g,K+)X

  11. p+ background K+p+ events selected p(GeV/c) m/q(GeV/c2) MM(g,K+)X

  12. Missing mass K+p - events MM(g,K+)X MM(g,K+p-)X

  13. Missing mass K+p - events MM(g,K+p+)X p+ K+ MM(g,K+)X

  14. Miss identification K+p - events Veto MM(g,p+p-)X MM(g,K+)X

  15. K* events K+p - events MM(g,K+)X Veto K* MK+p- MK+p-

  16. Missing mass K+p - events MM(g,K+)X MM(g,K+p-)X

  17. Missing mass K+p - events MM(g,K+p+)X MM(g,K+)X

  18. Y*Sp K+p - events MM(g,K+)X MM(g,K+p-)X Y*S+p-

  19. Y*Sp K+p - events MM(g,K+p-)X MM(g,K+)X

  20. Missing mass K+K- events MM(g,K+)X MM(g,K+K-)X gpK+Y*K+pK-

  21. f event K+K- events f veto MM(g,K+)X MK+K- MK+K-

  22. Y*pK- K+K- events p MM(g,K+K-)X MpK- gpK+Y*K+pK-

  23. Missing mass K+p events MM(g,K+)X MM(g,K+p)X

  24. Missing mass K+p events MM(g,K+p)X MM(g,K+)X

  25. Y*pK- K+p events Y*pK- MM(g,K+)X MM(g,K+p)X

  26. Y*pK- K+p events MM(g,K+)X MM(g,K+p)X

  27. Summary Summary • We are looking for the high-mass hyperon resonances above 1.52 GeV. • We observed a clear peak at 1.67 GeV, which can be interpreted as either L1670 (D03…) or S1670(D13). • The peak is strongly coupled to the decay channel • Y*  S pi • We need more statistics to confirm our finding. • LD2 data may help us identify if the Y* is L or S. • Y* can be also coupled to KN channel. We are going to see K-p data.

More Related