Z$ decay into a bottom quark, a light sbottom and a light gluino

Abstract

The discrepancy between the measured and theoretical production cross section of $b$ quarks at the Tevatron can probably be explained by the recently proposed scenario of light gluinos of mass 12-16 GeV and light sbottoms of mass $2-5.5$ GeV. In this scenario, we study a related process at the $Z$ pole, $Z\to b{\tilde{b}}_1^{\ast }\tilde{g}+\bar{b}{\tilde{b}}_1\tilde{g}$ followed by $\tilde{g}\to b{\tilde{b}}_1^{\ast }/\bar{b}{\tilde{b}}_1$. The hadronic branching ratio for this channel is $(1-3)\times 10^{-3}$, which is of order of the size of the uncertainty in $R_b$. We find that a typical event consists of an energetic prompt bottom-jet back-to-back with a ``fat'' bottom-jet, which consists of a bottom quark and two bottom squarks. Such events with a $10^{-3}$ branching ratio may affect the measurement of $R_b$; even more interesting if the ``fat'' bottom jet can be identified.

14 pages, references are added

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Cited by in corpus (9)

• Light Gluino and the Running of alpha_s
• Squark Mixing in Electron-Positron Reactions
• Z -> b b-bar b b-bar in the light gluino and light sbottom scenario
• Heavy bottom squark mass in the light gluino and light bottom squark scenario
• Z decays into light gluinos: a calculation based on unitarity
• Impact of CP phases on a light sbottom and gluino sector
• Phenomenological study of the atypical heavy flavor production observed at the Fermilab Tevatron
• Can there be a heavy sbottom hidden in three-jet data at LEP?
• R Parity Violating Decays of the Gluino