Hera Events, Tevatron Jets, and the Uncertainty On Quarks At Large X

Details Hera Events, Tevatron Jets, and the Uncertainty On Quarks At Large X Hera Events, Tevatron Jets, and the Uncertainty On Quarks At Large X

1997-04-16

arxiv.org/abs/hep-ph/9704338v2

Phys.Lett. B409 (1997) 271-276

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 page Latex, 8 ps figures, replaced with modifications to the text

Scientific paper

10.1016/S0370-2693(97)00885-X

The recently reported excess of events at HERA compared to QCD calculations impels us to examine all possible Standard Model explanations before invoking ``new physics''. We explore the possibility of adding an unusual, but small, component of additional quarks at large x (beyond x>0.75) as a way to increase the predicted SM cross-section in the HERA kinematic region by the QCD evolution feed-down effect. We describe various scenarios under which this can be achieved while maintaining good global fits to all established data sets. This implies a much larger SM uncertainty than commonly assumed. In addition, the modified parton distributions provide another possible mechanism to account for the CDF high-pt jet excess which occurs at similar x and Q^2 values.

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