Measurement of QCD Jet Broadening in $$p\bar{p}$$ Collisions at $$\sqrt{s}$$ = 1.8-TeV
- Rutgers Univ., Piscataway, NJ (United States)
A measurement of the QCD Jet Broadening parameter,< $$Q_t$$ >,is described for high $$E_t$$ jet data in the central CDF calorimeter. Most analyses of $$p\bar{p}$$ jet data compare to QCD predictions by identifying dusters of energy in a detector. As an alternate approach, the method employed here involves the use of a global event parameter which is free from the ambiguities associated with the definition and separation of individual clusters. The parameter, $$Q_t$$ , is defined as the scalar sum of the transverse momentum perpendicular to the transverse thrust axis. At the parton level, $$Q_t$$ is zero for the $$2 \to 2$$ QCD process and thus, to first order, comes from the $$2 \to 3$$ process. $$Q_t$$ is defined such that it cancels the divergences in the $$2 =\to 3$$ matrix elements, and thus it can be evaluated without imposing separation and minimum $$P_t$$ cuts on the $$2 \to 3$$ partons. QCD predictions made for < $$Q_t$$ > are the result of a $$2 \to 3$$ calculation divided by a $$2 \to 2$$ calculation and show some dependence of the strong coupling constant a. . Comparisons are made to first-order QCD parton level calculations as well as to fully evolved and hadronized leading log predictions. The data is well described by the QCD predictions.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1375741
- Report Number(s):
- FERMILAB-THESIS-1989-06; UMI-90-13406; 289105
- Country of Publication:
- United States
- Language:
- English
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