Improved Measurement of the Probability for Gluon Splitting into b bbar in Z{sub 0} Decays

Technical Report · Wed Sep 06 00:00:00 EDT 2000

DOI:https://doi.org/10.2172/764969· OSTI ID:764969

Burrows, Phil ^[1]

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1. SLAC

The authors present a preliminary measurement of the rate of gluon splitting into bottom quarks, g --> b anti-b, in hadronic Z{sup 0} decays collected by SLD between 1996 and 1998. The analysis was performed by looking for secondary bottom production in 4-jet events of any primary flavor. 4-jet events were identified, and a topological vertex-mass technique was applied to each jet in order to identify b or anti-b jets. The upgraded CCD based vertex detector gives very high B-tagging efficiency, especially for B hadrons of the low energies typical of this process. The two most nearly collinear b/anti-b jets were tagged as originating from g --> b anti-b. They measured the rate of secondary b/anti-b production per hadronic event, g{sub b/anti-b}, to be (2.84{+-}0.61(stat.){+-}0.59(syst.))xx 10{sup {minus}3} (preliminary).

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (US)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 764969
• Report Number(s): SLAC-PUB-8506
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B QUARKS
GLUONS
HADRONIC PARTICLE DECAY
PROBABILITY
QUANTUM FLAVORDYNAMICS
STANFORD LINEAR COLLIDER DETECTOR