Lambda Hyperon Polarization in Lambda - Proton Elastic Scattering in the Range 60 < $$P_{\Lambda}$$ < 380 GeV/c

Thesis/Dissertation · Sat Oct 01 04:00:00 EDT 1977

DOI:https://doi.org/10.2172/1435923· OSTI ID:1435923

Edelman, Brian Scott ^[1]

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1. Rutgers U., Piscataway

Polarization measurements are a useful indication of the importance of spin dependent forces in an interaction. This thesis presents the first high statistics measurement of the polarization arising from the elastic scattering of two nonidentical baryons. A large data sample consisting of 162,813 $$\Lambda$$-p elastic scatters was analyzed for the polarization of the scattered $$\Lambda$$ using the maximum likelihood technique. Data were seen in the momentum interval 60 < $$p_{\Lambda}$$ < 380 GeV/c and in the t interval 0.03 < $$\mid t \mid$$ < 1.4 (GeV/c)$^2$. At 100 GeV/c the data showed a polarization of -0.14 $$\pm$$ 0.04 in the t interval 0.1 < $$\mid t \mid$$ < 0.4 (GeV/c) $^2$ • . The polarization decreased with increasing $$\Lambda$$ momentum to -0.08 $$\pm$$ 0.03 at 140 GeV/c, -0.004 $$\pm$$ 0.021 at 180 GeV/c, -0.022 $$\pm$$ 0.018 at 230 GeV/c, and +0. 010 + 0.028 at 320 - GeV/c. A sample of 1367 $$\bar{\Lambda}$$-p elastic scatters was also - seen. The observed, $$\bar{\Lambda}$$ polarizations were +0.20 $$\pm$$ 0.14 at 95 GeV/c and -0.08 $$\pm$$ 0.14 at 145 GeV/c.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1435923
• Report Number(s): FERMILAB-THESIS-1977-11; RU-78-118; UMI-78-05073; 123388
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS