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Scaling of the F₂ structure function in nuclei and quark distributions at x>1

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arxiv 1008.2713 v1 pith:WQPUHX4D submitted 2010-08-16 nucl-ex

Scaling of the F₂ structure function in nuclei and quark distributions at x>1

classification nucl-ex
keywords nucleiscatteringfalloffmeasurementsquarksrangeagreescontrast
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We present new data on electron scattering from a range of nuclei taken in Hall C at Jefferson Lab. For heavy nuclei, we observe a rapid falloff in the cross section for $x>1$, which is sensitive to short range contributions to the nuclear wave-function, and in deep inelastic scattering corresponds to probing extremely high momentum quarks. This result agrees with higher energy muon scattering measurements, but is in sharp contrast to neutrino scattering measurements which suggested a dramatic enhancement in the distribution of the `super-fast' quarks probed at x>1. The falloff at x>1 is noticeably stronger in ^2H and ^3He, but nearly identical for all heavier nuclei.

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