Hi Kerstin,
first I have some comments to your numbers, that you are not really
comparing the correct things, but them I have some other numbers to
confirm your findings.
So, you can not take the numbers of events in the BSemiExcl data skim to
calculate any ratios. The contain all data (well, mostly Bs but anyway).
You have to run them through BbkLumi and use the luminosity or number of
BB events, which is the same by a constant factor.
And you are neglecting Run3, which might or might not affect the whole
thing. Anyway, here are the numbers run by run:
generic:
1235(all/BsemiExcl) 1237(all/BSemiExcl) total ratio 1235/1237
run1: 24246000 1667945 28762000 1814045 53008000 0.8429
run2: 119356000 8955315 120299826 7443054 239655826 0.9921
run3: 67974000 4742604 61310000 3914416 129284000 1.1087
run4: 332944433 27934200 336130399 24157489 669074832 0.9905
data: lumi Bcounting AllEvents BSemiExcl
run1: 19458.963 21181864 268587495 3982175
run2: 60266.741 66441247 866976254 12802202
run3: 31061.051 34076579 447426127 6688118
run4: 99762.620 110107681 1512711646 23104133
sum generic/2/data: (lumi)
run1: 1.362
run2: 1.987
run3: 2.081
run4: 3.353
So, there are two things. There is a minor dependency in the ratio
charged/neutrals by run period (~15%). There is a strong dependency
in the ratio generic/data by run period.
So, we should weight by different run period. It is possible to
distinguish between run123 and run4 using the run number. I will see if
this is also possible for run1, run2 and run3.
How about reweighting between charged and neutral Bs? Could/will be more
difficult. ;)
Cheers,
Wolfgang
Kerstin Tackmann wrote:
> Hi,
>
> here are some more numbers along these lines...
>
> I had a closer look at the number of events in the generic MC we are
> using.
>
> In the reduced ntuples (without any cuts, fits, ...) we have the following
> numbers of entries in the TTree:
> Run1+2 448821
> Run4 1196783
>
> the ratio of these is 2.667
>
> looking at Roberto's tcl files, I find these numbers (the numbers of
> events we run over in production):
> Run12 19880359
> Run4 52091689
>
> and the ratio is 2.620.
>
> This looks to me as if our ratio of generic MC between SP5 and SP6 simply
> does not match the ratio of luminosities in the corresponding runs in
> data. I thought we are supposed to use SP5 and SP6 so that it corresponds
> to the lumi ratios....
>
> in data I see in the tcl files
> Run1+2 16784377
> Run4 23104133
>
> and the ratio is 1.377.
>
>
> Are we not using all of the generic SP5? Or do we somehow use extra SP6?
> How did this come about? Could someone (Roberto, Wolfgang, ?) please
> clarify this?
>
> Kerstin
>
>
>
>> The interesting point is that the SP6/SP5 yield is different from
>> the ratio of Run4/Run1+2 luminosities, take e.g. your Vcb 1'bin numbers:
>>
>> SP6/SP5 = 1327.69/482.67 = 2.75
>> Run4/Run1+2 = 100ifb/80ifb = 1.25


Wolfgang Menges
Queen Mary, University of London SLAC, MS 35
Mile End Road 2575 Sand Hill Road
London, E1 4NS, UK Menlo Park, CA 94025, USA
+44 20 7882 3753 ++1 650 926 8503
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