Scaling of the F_2 structure function in nuclei and quark distributions at x>1

Details Scaling of the F_2 structure function in nuclei and quark distributions at x>1 Scaling of the F_2 structure function in nuclei and quark distributions at x>1

2010-08-16

arxiv.org/abs/1008.2713v1

Phys.Rev.Lett.105:212502,2010

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 4 figures, to be submitted to physical review

Scientific paper

10.1103/PhysRevLett.105.212502

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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