CDF Inclusive Jet Analyses

In 1989 measured jet spectrum up to Et = 250 GeV -> consistent with LO QCD and with expected scaling violations wrt UA1/2 data. In 1992 with higher statistics measured jet spectrum to Et = 400 GeV and compared with NLO QCD -> consistent although there was a small (insignificant) excess at high-Et. Variation of cross-section with cone size at Et = 100 GeV approximately reproduced by NLO QCD with scale choice mu = Et/4, but not with softer scales. In 1993 compared jet Et spectra at 546 GeV and 1800 GeV, and found the data were 1.5-2.4 sigma below the predicted NLO QCD scaling violations -> an anomaly at low Et ? In 1996 published a high statistics measurement of the jet spectrum out to Et = 400 GeV c.f. NLO QCD -> significant excess at high-Et. May be due to inadequacies in gluon distribution or other QCD details.

Jet Differential Cross-Section c.f. LO QCD: ___________ PRL 62, 613 (1989)
Jet Differential Cross-Section c.f. NLO QCD: __________ PRL 68, 1104 (1992)
Scaling Violation Test (546 GeV c.f. 1800 GeV) __________ PRL 70, 1376 (1993)
Run 1A Differential Cross-Section c.f. NLO QCD: ______ PRL 77, 438 (1996)

Currently Active People: Alex Akopian, Anwar Bhatti, Brenna Flaugher, Christiana

Run 1B Differential Cross-Section c.f. NLO QCD: ______ ONGOING

Extraction of Alpha_s: _______________________________ STARTING

Scaling Violation Test (630 GeV c.f. 1800 GeV): _________ ONGOING