Dijet Mass Spectrum and a Search for Quark Compositeness in $\bar{p} p$ Collisions at $\sqrt s = 1.8 TeV$

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22 March 1999

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 82 (12) , 2457-2462
https://doi.org/10.1103/physrevlett.82.2457

Abstract

Using the D0 detector at the 1.8 TeV

\bar{p} p

Fermilab Tevatron collider, we have measured the inclusive dijet mass spectrum in the central pseudorapidity region

| η_{jet} | < 1.0

for dijet masses greater than

200 GeV {/ c}^{2}

. We have also measured the ratio of spectra

σ (| η_{jet} | < 0.5) / σ (0.5 < | η_{jet} | < 1.0)

. The order

α_{s}^{3}

quantum chromodynamics predictions are in good agreement with the data and we rule out models of quark compositeness with a contact interaction scale

< 2.4 TeV

at the

95 %

confidence level.

Keywords

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