1 / 20

Σ (1385) and Λ (1405) from KLOE

Σ (1385) and Λ (1405) from KLOE. S.Wycech. Chiral v.s. Y-A Akaishi. Uncertainties. Initial state clarified for dense He  S wave Final state interactions Σ  Λ conversion important for Σ (1385) extraction background estimate

allan
Download Presentation

Σ (1385) and Λ (1405) from KLOE

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. Σ(1385) and Λ(1405) from KLOE S.Wycech

  2. Chiral v.s. Y-A Akaishi

  3. Uncertainties Initial state clarified for dense He  Swave Final state interactions Σ Λ conversion important for Σ(1385) extraction background estimate ratio (Σ+ π-)/(Σ- π+) = | A0 + A1|2 | A0 - A1|2 good check for energy dependence in A1 and A0 Technicalities : helium wave function , 3-5 body kinematics

  4. Dependence on capture stateprobably settled to S wave.Not clear- wave function in He, 3 body effects, FSI • Riley, Esmaili

  5. Examples : Old K-He data Bubble chamber experiments detect P π , PΣ , T3He K-4He  3He, π- , Λ K-4He  3He, π, Σ

  6. K-4He  3He, π- , ΛFetkvoich K- n  π- , Λ S wave capture Σ Λ K- n  Σ(1385) T π 100 150

  7. K-4He  p,d, π- , ΛRoosen K- n  π- , Λ K- N  Σπ- conversion Σ  Λ P π 100 150 Calculations exists (not bad) no clear evidence for Σ(1385)

  8. K-4He  3He, π- , ΛFetkvoich K- n  π- , Λ and convergence T π >90 K- n  Σ(1385) T 3He 20 40

  9. Recoupling Σ(1385) calculations never done s p p s Higher rate for Σ in p –atomic level Calculation may be done

  10. Good news from KLOE

  11. Capture from flight and at stop P = ρ | t( EKN) Φ(pN) | 2 ρ – phase space EKN= EN + EK - pKN2/2Mred Φ(p) – Fourier transform of ΦN(r) ΦK(r) Flight pN = pΣπ- pK ΦK(r) = exp(i r pK) Stop ΦK = ΦATOM ; TK=0 ; pN = pΣπ

  12. Simple procedure Stop : Pexp(M) / ρ |Φ( pΣπ) |2 ~ | t( EKN) |2 Flight : Pexp(M) / ρ |Φ(pK -pΣπ) |2 ~ | t( EKN) |2 Look for continuity (? )

  13. Simple procedure

  14. A puzzle – shift larger than 20 MeV An effect of changed Fourier transform ?

  15. CLAS, HADES dependence on entrance mechanism PP K+ K- , pp Wasa /Juelich σΦ E

  16. CLAS – entrance mechanism γ K+ K- p Λ(1405) Peak depends on W (γp-energy)

  17. HADES mechanism ΦΛ(1405) K+ May deform the line in a different way

More Related