Statewide SRD presentation (Official)
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Transcript of Statewide SRD presentation (Official)
JUAN CARDENAS - PHYSICS MAJORNIGMS RISE SCHOLAR
Juan CardenasCSUDH
Evidence for Λp Elastic Scattering in the CLAS Detector
Cal State University, Dominguez Hills Hadronic Structure Laboratory
Mentor: Dr. John Price
CSUDH
OUTLINE
Juan Cardenas
Λp Scattering Motivation
Previous DataData mining g12 SkimmingData Analysis MethodsResultsFuture Plans
PROTON STUDY
Juan CardenasCSUDH
γp→γpProton interacts via EM + Strong forceK+, π+, Ko, π-
p, Λ, Ξ But.. other particles
don’t live long..
Κ Λ
Ξ Σ
π
n
p
CSUDH
PHYSICAL EXPERIMENT
Juan Cardenas
Data mining on g121 of 2 with long target 40cm LH2
Energy 3.6 – 5.4GeVWell suitedLarge acceptance
(Spherical shape)
CSUDH
Data Skim/Data Selectiono Look for 2
protonso Apparent
Baryon # violation = Rescattering Signal
o 126TB -> 17GB • Reconstruct
scattered Λ
Juan Cardenas
Apparent Baryon Number Violation
126 TB
17GB
CSUDH
Implications1:Brought Lambda beams to Nuclear Physics.
2: Twice the world sample in 750Mev – 2.5 GeV range (p)
3: Data points Error bars
Juan Cardenas
Special Thanks!
Juan Cardenas
Dr. John PriceCLAS collaborationJefferson LabNIGMS-RISE ProgramNIHColleagues at CSUDH
CSUDH
CSUDH
FUTURE
Juan Cardenas
Cross Section Requires Clean up background
for exact # of events Find effective path
lengthPAC proposal • Dedicated experiment
for Λ beam
CSUDH
Works Cited
Juan Cardenas
Scattering Cross-section Graph http://pdg.lbl.gov/2015/hadronic-xsections/rpp2014-
lambdap_sigmap_gp_gd_gg_plots.pdfPicture of CLAS Detector http://slideplayer.com/slide/1371778/ Picture of Real Detector https://www.google.com/search?q=CLAS+detector&espv=2&bi
w=1280&bih=705&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjepZXerMbLAhVL9GMKHaolA4oQ_AUIBygC#imgrc=jx78kxI3wJ-gJM%3A
PROTON https://en.wikipedia.org/wiki/Proton#/media/
File:Quark_structure_proton.svg Neutron https://en.wikipedia.org/wiki/Neutron#/media/
File:Quark_structure_neutron.svg
Works cited Cont.
Juan Cardenas
(Funnel pic) https://41perspectives.files.wordpress.com/2013/07/funnel-diagram-powerpoint2.jpg
CSUDH
Probability of Scattering in G12
Juan Cardenas
Given our parameters how often should Λp→ Λp happen?
CSUDH