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Quick update on fits for 29/2/08 AM Cooper-Sarkar

Quick update on fits for 29/2/08 AM Cooper-Sarkar. Have tried the new inbetween Further suggestion. Bg= -0.03 ± 0.02 Cg= 7.8 ± 0.7 Buv= 0.69 ± 0.07 Cuv= 5.1 ± 0.2 Duv= 12.1 ± 2.3 Euv= -0.66 ±0.91 Cdv= 3.8 ± 0.4 BUbar = -0.206 ± 0.005 CUbar = 5.1 ± 0.9 ADbar = 0.159 ± 0.006

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Quick update on fits for 29/2/08 AM Cooper-Sarkar

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  1. Quick update on fits for 29/2/08 AM Cooper-Sarkar • Have tried the new inbetween • Further suggestion

  2. Bg= -0.03 ± 0.02 Cg= 7.8 ± 0.7 Buv= 0.69 ± 0.07 Cuv= 5.1 ± 0.2 Duv= 12.1 ± 2.3 Euv= -0.66 ±0.91 Cdv= 3.8 ± 0.4 BUbar = -0.206 ± 0.005 CUbar = 5.1 ± 0.9 ADbar = 0.159 ± 0.006 CDbar = 4.0 ± 1.1 Feltesse Cooper-Sarkar Chi2 old = 437.9 Chi2 new = 428.0 Look at parameters, agree that gluon distribution must be flatter at low-x

  3. Yes but probably not worth it -except for model dependence- concentrate on ‘inbetween’ Not sure, its true its very interesting, but do we want to tell it to the world? Using the ‘best’ (ie straight) versions of H1 and ZEUS-jets params (with further ZEUS-JET optimisation) can be one part of model dependence- but of course there are many other dependences I am wary of using straight/humpy for model dependence

  4. Probably should use versions with latest low-Q2 sets in for consistency with low-x slope analysis- what about BPC/T In between, PDG value, Vary cuts and Q0for model dependence, SHOULD use VFNS but this would need Q02=2 for consistency Considering Hessian/Offset/Quadratic, so far Joel and I have only compared quadratic in any detail- to do anything else will take more time. If Offseting it may be most appropriate just to offset the 4 procedural errors NO PDF providers have ever put scale dependences into their uncertainties, nor the contribution from alphas. They only do this if considering an alphas measurement itself See last slide We’ve only got one month to do this in!

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