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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
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High-mass resonance with K* data

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  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.

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