[G12] Proposed abstract for HYP18

[John Price]

Hi Lei:

At the present time, I do not anticipate presenting cross sections.
That is actually Joey Rowley's work (which my students might finish in
parallel before the meeting), so he should get the first public
presentation of that.  Note that, at the present time, the cross section
calculation is more of an "estimate" than a "calculation", since the
simulation was not actually the Lambda-p process, but a process with a
similar final state and similar Lambda beam characteristics.  It's not
necessarily "wrong", but we probably want to be more careful about
making sure it's "right" before we stick our necks out on it.

My intent is to talk about the physics behind the process, the progress
we have made in the analysis and the prospects for getting a cross
section, and to finish up with a look forward to other things we can do
with a similar technique.  Note that I have also started this analysis
with g11 data, and we see many, many Lambda p scattering events; I
estimate about 17,000.  There is a great deal more work to do before we
are ready to present that, but I hope to have that in reasonable shape
by June.  Other things we are looking at are the proton-proton
scattering I brought up earlier, and also K-short proton scattering.  We
can reconstruct the final-state K-short very well, but we will need some
more work before I show it to anyone, really...

John

On Tue, 2018-04-03 at 13:52 -0700, Lei Guo wrote:
> Hi, John,
> 
> Sounds good. Is this an invited or contributed talk? Will cross sections be shown if any? Just want to remind you that we need CLAS speaker committee’s approval.
> 
> Cheers!
> 
> Lei
> > On Apr 3, 2018, at 8:43 AM, John W. Price <jprice at csudh.edu> wrote:
> > 
> > Hi all:
> > 
> > Ken Hicks and I have talked about submitting an abstract for HYP18 at JLab this June.  We’re past the deadline, but have contacted the organizers about submitting this.  Please let me know your comments ASAP.
> > 
> > =====
> > Lambda proton elastic scattering in CLAS
> > J.W. Price, M. Guillen, N. Nunez, J. Rowley, and K. Hicks
> > Lambda-Proton elastic scattering offers multiple insights on problems in nuclear physics. SU(3)-flavor symmetry implies a close agreement between the Lambda-proton and proton-proton scattering cross sections. The Lambda-Proton elastic scattering cross section can also illuminate the structure of neutron stars. A data-mining project was started using multiple CLAS data sets taken for other purposes with photon beams on a long liquid hydrogen target. A Lambda produced in a process such as gamma p-->K+ Lambda can interact with a second proton inside the target before either decaying or leaving the target. The good angular acceptance and momentum resolution of CLAS make it well-suited for this type of analysis, even though it was not designed for a measurement such as this. The scattered Lambda can be found in the pi- proton invariant mass. The four-vector of the initial Lambda is then reconstructed in the process Xp-->Lambda p, which shows a strong peak at the Lambda mass with roughly twice the number of events as the existing world data sample. This observation opens up the possibility of other measurements using secondary beams of short-lived particles. This talk will discuss the current status of the analysis, and our plans for future work on this project.
> > =====
> > 
> > John
> > 
> > -- 
> > John W. Price
> > Professor and Chair, CSUDH Department of Physics
> > Coordinator, Science, Mathematics, and Technology Program
> > Director, Office of Undergraduate Research, Scholarship, and Creative Activity
> > 310-243-3403
> > 
> > _______________________________________________
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> 

-- 
John W. Price
Professor and Chair, CSUDH Department of Physics
Coordinator, Science, Mathematics, and Technology Program
Director, Office of Undergraduate Research, Scholarship, and Creative
Activity
310-243-3403