[Clas12_verystrange] Resolved Omega- issue

[Michael Dugger]

Derek,

I looked at requiring the K-, and also demanding that the K0 vertex is 
separated from the K+ vertex by > 0.5 cm and get the same thing as you:
Super clean. No background at all :)


-Michael

On Fri, 24 Feb 2012, Derek Glazier wrote:

> Hi Mike,
>   The consistency is good now at least. And if you detect the K- too the 
> situation is actually quite promising as the background seems to be entirely 
> suppressed by a vertex cut.
> Cheers
> Derek
>
> On 02/24/12 19:42, Michael Dugger wrote:
>> 
>> Hi,
>> 
>> I have now found the answer to my original question as to whether my Omega 
>> plot looked reasonable.
>> 
>> The problem: The cross section weighting for the Omega- was too large when 
>> I simply scaled the neutral cascade cross section by 1/10. The effective 
>> cross section I reported earlier was measured after the detection 
>> efficiency, so it was just dumb luck that the effective cross section ended 
>> up near the value that we wanted BEFORE the simulated detector response.
>> 
>> I put in 0.3 nb for the Omega- cross section (as Igor requested) and got 
>> the plot attached (OmegaMNew.gif).
>> 
>> The bad news: The Omega- signal I get is consistent with Derek's and is a 
>> sad little guy :(
>> 
>> Take care,
>> Michael
>> 
>> 
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>
>