[Clas_hadron] Abstract for April APS

[Michael Evan McCracken]

Thanks, Volker.  I'll add a line about predictions if I can find 
numerical values.  In what literature Matt and I have found, it seems 
that predictions focus on decays of heavy mesons to lighter baryons, 
mostly for charm and bottom mesons.  I'll do some more searching and see 
if I can find anything that is Lambda- or even strange-quark-specific. 
Leptoquarks seem to be a hot theoretical topic right now, so perhaps I'm 
missing something.

   As far as g12 is concerned, the main reasons for using g11 are:
1) Matt and I are familiar with it.
2) It has a (relatively) huge and *clean* sample of Lambdas when using 
three-track final states.
3) I've been working with the compressed copy of it that resides at CMU. 
  This has made analysis very quick and nimble.

I could look into adding g12 to the analysis, but I'd probably first try 
performing an analysis that requires only two charged final-state 
particles.  This would provide a large increase in statistics, but would 
also greatly increase background contamination.
   We haven't been able to find any other searches for these reactions, 
so setting any upper limit will be a first.  This isn't a great reason 
to not expand the Lambda sample, but we're working to understand the 
analysis right now.  Perhaps these techniques can later be applied to 
larger samples.

Thanks for the comments.
-mCc-


----------------------------------------------
Michael Evan McCracken, Ph.D.
Assistant Professor of Physics
Washington & Jefferson College
60 South Lincoln Street
Washington, PA 15301
(724)223.6148
----------------------------------------------

On 12/27/12 13:52 PM, burkert wrote:
> Hi Mike,
>
>   Great to see that you are still actively analyzing CLAS data. I surely
> hope you won't find any baryon-number violating Lambda decays with only
> 3 million Lambda events. But if you can push the upper limit down by an
> order of magnitude that would be a nice result.
> In your abstract you may want to provide some information about any
> "super-", "grand-.." or other theories that would predict such decays
> and at what scale.
>
> Best,
> Volker
>
>
>
>
>       On 12/27/12 12:23 PM, Michael Evan McCracken wrote:
>> Dear Spectroscopists,
>>   I would like to give a 10-minute contributing talk at the April APS
>> meeting in Denver.  I plan to present the status of a search for
>> baron-number-violating decays of the $\Lambda$ hyperon using the g11
>> dataset.  I have been working on this analysis with Matt Bellis since
>> last Summer, and it is progressing nicely.  This news may seem out of
>> the blue, but I plan to give a full talk at the Hadron Spec Working
>> Group meeting on February 22nd.
>>   Until then, the abstract has been placed in the JLab filesystem at
>> http://www.jlab.org/Hall-B/secure/hadron/abstracts/2012/aps_april_2013_mccracken.pdf
>>
>> A pdf of the abstract is also attached to this e-mail.
>>
>> I welcome any comments or suggestions.
>>
>> Best regards,
>> Mike McCracken
>>
>>
>> ----------------------------------------------
>> Michael Evan McCracken, Ph.D.
>> Assistant Professor of Physics
>> Washington & Jefferson College
>> 60 South Lincoln Street
>> Washington, PA 15301
>> (724)223.6148
>> ----------------------------------------------
>>
>>
>> This body part will be downloaded on demand.
>