Measurement of the dijet transverse thrust distribution in proton - anti-proton collisions
This dissertation presents the first measurement in a hadron collider of an event shape variable, the Dijet Transverse Thrust T$$t\atop{2}$$ which is sensitive to the spatial jet distribution on the plane perpendicular to the colliding p$$\bar{p}$$ beams. $$t\atop{2}$$ is calculated with the two most energetic jets reconstructed with the k$$\perp$$ algorithm, and it ranges from T$$t\atop{2}$$ =1, for a pencil-like configuration, to T$$t\atop{2}$$ =√2/2, for two equal energy jets at 90°. The measurement is based on 87.3 pb-1 of data collected with the D0 detector at the Fermilab Tevatron p$$\bar{p}$$ Collider. The cross section is reported as a function of 1-T$$t\atop{2}$$ and log (1-T$$t\atop{2}$$), with enhances the high statistics T$$t\atop{2}$$→1 region, and presented for four separate event energy ranges. The measurement is in good agreement with a fixed-order O(α$$3\atop{s}$$) perturbative QCD prediction, except at high T$$t\atop{2}$$, where resummation corrections are expected to be important, and below T$$t\atop{2}$$≃√3/2, where the leading order diagrams contributing to T$$t\atop{2}$$ are O(α$$4\atop{s}$$). The data also show a very good level of agreement with a recent Next-to-Leading pQCD three jet generator which covers the full T$$t\atop{2}$$ range, except for the T$$t\atop{2}$$=1 point.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 878910
- Report Number(s):
- FERMILAB-THESIS-2003-48; TRN: US200721%%343
- Country of Publication:
- United States
- Language:
- English
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