Precision measurement of the {Sigma}{sup 0} hyperon mass

Conference · Tue Feb 17 04:00:00 EST 1998

OSTI ID:303917

Wang, M H.L.S.; Hartouni, E P; Kreisler, M N ^[1]

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1. and others

The research that is described in this paper is part of a program to study strong interaction mechanisms in proton proton collisions. The program consists of two experiments: Brookhaven E766 in which we studied the reactions pp {yields} p+ all charged particles with 27.5 GeV/c incident protons and Fermilab E690 in which we studied the reactions pp {yields} p+ all charged particles with 800 GeV/c incident protons. In these experiments, we employed state-of-the-art data acquisition sys- tems and acquired large samples of data: at Brookhaven we amassed 300 million high multiplicity events and at Fermilab, 5.5 billion events. Our uncertainty in the {Sigma}{sup 0} mass is more than 7 times smaller than the best previous result and was based on 16 times the statistics. Likewise, the {Sigma}{sup 0} - {Lambda}{sup 0} mass difference is more than 14 times more accurate than the previous best result. Finally, we note that this measurement is the first direct measurement of the {Sigma}{sup 0} mass.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE Office of Financial Management and Controller, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 303917
• Report Number(s): UCRL-JC--129889; CONF-9711168--; ON: DE98054343; BR: YN0100000
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ACCURACY
PROTON-PROTON INTERACTIONS
REST MASS
SIGMA NEUTRAL PARTICLES