[Clas_hadron] Slides for presentation at BARYONS 2013

[Michael Evan McCracken]

Hi, Igor,
  Thanks for the comments. You are certainly correct about the the relation of our sensitivities to those from proton decay. I hope that I don't give the impression that that we're claiming a comparable study. 
  As to the SU(5) comment, I am not sure that I understand SU(5) theories well enough to comment on how they handle the neutrinos. I believe that there are proposed extensions which allow for massive neutrinos, but I'll plan to review the literature more before Thursday. However, SU(5) does suggest couplings of quarks to the charged leptons. Because CLAS gives us the opportunity to look for the neutral decay mode without too much extra work, I think that this measurement is worthwhile. As an aside, I'll add that I wish that we had access to a Lambda -> pi^0 nu channel, as this would offer access to couplings not covered by the reactions we've studied. Perhaps if there's interest, this could be done at a facility like CB ELSA. 
Best regards,
Mike

Michael Evan McCracken, Ph.D.
Washington & Jefferson College


On Jun 21, 2013, at 11:33, Igor Strakovsky <igor at va.gwu.edu> wrote:

> Mike,
> 
> Your slides look great.  Let me make two comments...
> 
> - The sensitivity of your decay is much-much-much more weaker vs proton
> and bounded neutron study.
> 
> - Your ref on SU(5) does not work well - SU(5) has no mixture to the
> neutrino because its multiplets have no right components of the neutrino.
> In this case, the neutrino is massless and there is no neutrino
> oscillations.
> 
> Kind Regards, Igor
> 
> On Thu, 20 Jun 2013 18:36:23 -0400, Michael Evan McCracken 
> <mmccracken at washjeff.edu> wrote:
> 
>> Dear all,
>>  I have posted slides for a talk that I will be giving next Thursday 
>> at the BARYONS conference in Glasgow.  The talk describes an analysis 
>> that Matt Bellis and I have been pursuing, searching for baryon number 
>> violating decays of the Lambda hyperon.  Slides can be found here:
>> http://www.jlab.org/Hall-B/secure/hadron/wiki/images/c/c2/Mccracken_baryons2013.pdf
>>  I spoke about the analysis at the last HSWG meeting (February). 
>> These slides are largely similar the ones shown in February (and at the 
>> APS meeting in April), though in the past few weeks we have unblinded 
>> our analysis and found no signal at branching fraction sensitivities on 
>> the order of ~5x10^-7.
>>  I welcome any comments or suggestions, and I look forward to seeing 
>> some of you in Glasgow.
>> 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
>> ----------------------------------------------
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> 
> Igor Strakovsky, SAID CNS The George Washington University
> Tel: 703-726-8344(NV),202-994-4742(FB),Skype: igors1945_2
> Fax: 202-994-3001(FB),Emails: igor at va.gwu.edu, igor at jlab.org
>