[Clas_hadron] [EXTERNAL] Abstract for April APS meeting

[John W. Price]

Hi all:

I would like to submit the following abstract to the April APS meeting.  Please let me know if you have any comments.  The deadline for submission is January 9.  I do not plan to show any cross sections other than those we have already published in the Rowley et al. paper from 2021 (which are, of course, already approved by the collaboration).  This talk will focus on improvements to the analysis we have made since that work was done.

John

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Nuclear Physics with Short-Lived Beams
J.W. Price (for the CLAS Collaboration)
Short-lived beam particles in nuclear physics present problems for both the beam flux and target thickness calculations. Historically, bubble chamber experiments measured these quantities directly during datataking. While measurements of the kinematic variables were very precise, these experiments were statistics-limited, due to rate limitations of bubble chambers. Modern large-acceptance detectors can overcome this limitation, with data rates several orders of magnitude greater than bubble chambers. The final-state particles are either detected directly or reconstructed from their decay particles. The beam particle is not detected directly, but is inferred via a missing mass calculation. A recent study with the CLAS detector at JLab in Newport News, Virginia used a preliminary version of this technique to measure the cross section for Lambda p -> Lambda p. The scattered Lambda was inferred via its decay to pi- p; the presence of two protons in the final state reduced greatly the amount of data to be analyzed. Although the incident momentum range was limited, the number of events in this measurement was far greater than any previous measurement for this process. This talk will present the motivations for the development of short-lived beams, the present status of this project with the CLAS Collaboration, and plans for future improvements to the technique.
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John W. Price
Professor, CSUDH Department of Physics
T: (310) 243-3403 | E: jprice at csudh.edu
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