1 / 10

New Data, Efficiency and Background Models

New Data, Efficiency and Background Models. Omit tips & boundaries. ~ 518K events L>0.93. LnL = -1564843.8, NDF 37953 c 2 /NDF = 1.135. Data – Larger Sample. ~ 2M events L>0.70. LnL=-7708417.7, NDF 104598 c 2 /NDF = 1.09. Next. Make sure the isobar model fits work first !

fell
Download Presentation

New Data, Efficiency and Background Models

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. New Data, Efficiency and Background Models Omit tips & boundaries ~ 518K events L>0.93 LnL = -1564843.8, NDF 37953 c2/NDF = 1.135

  2. Data – Larger Sample ~ 2M events L>0.70 LnL=-7708417.7, NDF 104598 c2/NDF = 1.09

  3. Next • Make sure the isobar model fits work first ! • Include I=2 (p+p+) amplitude • Allow P-wave magnitudes to float below Kh threshold? • Input LASS P-wave • Other ideas ?

  4. Data come from: p+p  p+ p+ n (12.5 GeV/c) Hoogland et al, Nucl. Phys. B69, 266 (1974) p-d  p- p- p ps (9 GeV/c) Durusov et al, Phys. Lett. B45, 517 (1973) (Re-)Fit to form: d02 = -aq / (bm2+cm4+dm6) Achasov and Shestakov, Phys. Rev. D67, 114018 (2003) Then assume amplitude is unitary up to rr threshold: A2= ei d02 sin d02 I=2 p+p+ Amplitude

  5. Data – Isobar Model Fitk, K0(1430), K1(1410), K1(1688), K2(1420) All K* states (+ k!) Best isobar model fit ~ 2M events L>0.70 LnL=-8114132.0, NDF 108158 c2/NDF = 1.137

  6. Data – Isobar Model Fitk, K0(1430), K1(1410), K1(1688), K2(1420) No K1*(1410) 2nd best isobar model fit ~ 2M events L>0.70 LnL=-8112686.3, NDF 108160 c2/NDF = 1.152

  7. Data – Isobar Model Fitk, K0(1430), K1(1410), K1(1688), K2(1420) No K2*(1420) Worst isobar model fit ~ 2M events L>0.70 LnL=-8105548.8, NDF 108160 c2/NDF = 1.229

  8. Data – Isobar Model Fitk, K0(1430), K1(1410), K1(1688), K2(1420) Include I = 2p+p+ Equal to best isobar model fit ~ 2M events L>0.70 LnL=-8114132.0, NDF 108160 c2/NDF = 1.137

  9. P-Wave Magnitude • It is necessary to define a reference phase everywhere in the Dalitz plot • Define P-wave phase as that appropriate for the K*(890) Breit-Wigner from threshold up to Kh threshold. • The cross channel just overlaps this range • It is also necessary to define a magnitude scale. • Set this to 1.0 at the K*(890) pole. • It is not necessary to fix the magnitudes to follow the K*(890) Breit-Wigner

  10. Data – Float P-wave Magnitudes ~ 2M events L>0.70 LnL=-7708543.2, NDF 104590 c2/NDF = 1.088

More Related