Study of [Lambda][sup 0] Polarization in Four Different Exclusive pp Reactions at 27. 5 GeV/c

Journal Article · Tue Jun 01 04:00:00 EDT 1999 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.82.5213· OSTI ID:6470472

Felix, J; Avilez, C; Moreno, G ^[1]; Hartouni, E P; Jensen, D A; Kreisler, M N; Uribe, J; Wang, M H ^[2]; Christian, D C; Gutierrez, G; Holmes, S D; Wehmann, A ^[3]; Church, M D; Gottschalk, E E; Knapp, B C; Stern, B J; Wiencke, L R ^[4]; Forbush, M; Huson, F R; White, J T ^[5]

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1. Universidad de Guanajuato, Leon, Guanajuato (Mexico)
2. University of Massachusetts, Amherst, Massachusetts 01003 (United States)
3. Fermilab, Batavia, Illinois 60510 (United States)
4. Columbia University, Nevis Laboratories, Irvington, New York 10533 (United States)
5. Department of Physics, Texas AM University, College Station, Texas 77843 (United States)

We have measured the x[sub F] and P[sub T] dependence of the polarization of [Lambda][sup 0] hyperons produced in exclusive final states pp[r arrow]p[Lambda][sup 0]K[sup +][pi][sup +] [pi][sup [minus]] , pp[r arrow]p[Lambda][sup 0]K[sup +][pi][sup +] [pi][sup [minus]][pi][sup +][pi][sup [minus]] , pp[r arrow]p[Lambda][sup 0]K[sup + ][pi][sup +][pi][sup [minus]][pi][sup +] [pi][sup [minus]][pi][sup +][pi][sup [minus]] , and pp[r arrow]p[Lambda][sup 0]K[sup +][pi][sup +] [pi][sup [minus]][pi][sup +][pi][sup [minus]][pi][sup +][pi][sup [minus]][pi][sup +][pi][sup [minus] ] at 27.5thinspthinspGeV/c . We present an empirical parametrization for [Lambda][sup 0] polarization as a function of x[sub F] and P[sub T] : P=([minus]0.443[plus minus]0.03 7)x[sub F]P[sub T] for [minus]1[le]x[sub F][le]1 and 0[le]P[sub T][le]1.8 GeV/ c . This parametrization is independent of the final state and provides a good description of the data. We note that the mechanism responsible for [Lambda][sup 0] polarization appears to be independent of the production mechanism. [copyright] [ital 1999] [ital The American Physical Society]

• DOE Contract Number: AC02-76CH03000; AS05-87ER40356; W-7405-ENG-48
• OSTI ID: 6470472
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Vol. 82:26; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

662340* -- Hadron Interactions-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON-BARYON INTERACTIONS
BARYONS
BOSONS
ELEMENTARY PARTICLES
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
HYPERONS
INTERACTIONS
KAONS
KAONS PLUS
LAMBDA BARYONS
MESONS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PIONS
PIONS MINUS
PIONS PLUS
POLARIZATION
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
PSEUDOSCALAR MESONS
STRANGE MESONS
STRANGE PARTICLES