Convener: Ashutosh Kotwal
We present measurements of the Drell-Yan cross section at high dielectron invariant mass using 120 pb-1 of data collected in pbar-p collisions at sqrt(s) = 1.8 TeV by the DØ experiment during 1992-1996. No deviation from standard model expectations is observed. We use the data to set limits on the energy scale of quark-electon compositeness with common constituents. The 95% confidence level lower limits on the compositeness scale vary between 3.3 TeV and 6.1 TeV depending on the assumed form of the effective contact interaction.
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| Preliminary DØ dielectron mass distribution. | Preliminary DØ measured Drell-Yan cross section. |
| Model | Λ+ (TeV) | Λ- (TeV) |
| LL | 3.3 | 4.2 |
| LR | 3.4 | 3.6 |
| RL | 3.3 | 3.7 |
| RR | 3.3 | 4.0 |
| LL+RR | 4.2 | 5.1 |
| LR+RL | 3.9 | 4.4 |
| LL-LR | 3.9 | 4.5 |
| RL-RR | 4.0 | 4.3 |
| VV | 4.9 | 6.1 |
| AA | 4.7 | 5.5 |
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