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:365965

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}

• Research Organization: Fermi National Accelerator Laboratory
• DOE Contract Number: AC02-76CH03000; AS05-87ER40356; W-7405-ENG-48
• OSTI ID: 365965
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 26 Vol. 82; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HYPERONS
KAONS PLUS
LAMBDA BARYONS
PIONS MINUS
PIONS PLUS
POLARIZATION
PROTON-PROTON INTERACTIONS