[Halld-physics] talk for W&M

[Kei Moriya]

Hi Volker,

You can see the details in my slides, but from the PAC numbers,
we expect an efficiency of
(0.40)^3 × 0.80 × 0.70 = 0.029
for a 2 K+, K-, p, pi- final state.

The slides show that with the current way I produce the events,
there is a very forward, very high momentum K+ and low momentum pi-.
I think those, together with the detached Lambda vertex
will probably account for much of the loss
compared to the nominal numbers we used in the PAC.

	Kei

On 1/20/14 5:41 PM, Volker Crede wrote:
> Dear Kei,
>
> Just a brief question: Are your Xi(1820) studies and yield estimates consistent with our dziscussion in last year's proposal?
>
> Best wishes and good luck with your talk,
>
>         Volker
>
>
> On Jan 20, 2014, at 5:03 PM, Kei Moriya <kmoriya at indiana.edu> wrote:
>
>> Dear all,
>>
>> Thank you for listening to my practice last week for
>> my talk this Friday at William & Mary, and again for
>> the many comments that people sent in afterwards.
>> I would also like to thank those who sent me pictures
>> and figures for use. For groups developing detectors,
>> if you would like a different picture to be used, please
>> let me know.
>>
>> I have updated the talk, and the talk can be downloaded
>> from the DocDB at:
>> http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=2384
>>
>> I have added a few estimates of yields and figures based on
>> the simulation studies I have been doing.
>>
>> For justification
>> of these, please see the slides at the following:
>> http://dustbunny.physics.indiana.edu/~kmoriya/2014-01-20-Xi/
>>
>> I can explain these figures and estimates at the next
>> physics meeting next Monday. The current results are:
>>
>> - we will produce 3M K+ K+ Xi- events with a 5 nb cross section
>>    (all yield results for Phase IV running)
>> - the reconstruction efficiency for Xi- is 4.2%
>> - the mass resolution of Xi-(1820) -> Lambda K- is 10 MeV
>> - the vertex resolution in z for the K+ in Xi-(1820) production is
>>    ~0.05 cm, with worse resolution for secondary vertices
>> - we will produce 600k Xi-(1820) events with a 1 nb cross section
>> - the reconstruction efficiency for Xi-(1820) is 1.6%
>>
>> My talk is this Friday, so please send in any comments
>> or further suggestions by then. There will be some small
>> changes of course, but unless there are strong objections,
>> I think the talk is in it's semi-final form.
>>
>> Thanks again for your comments and suggestions,
>>
>> 	Kei
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>
>