- Conference date: 26–31 May 2009
- Location: San Diego (LaJolla) (California)
We discuss two recently carried out experiments at Jefferson Lab that measured with precision the spin structure function of the nucleon aiming at the determination of the twist‐3 matrix element known as for both the proton and the neutron. This matrix element is related to the average Lorentz color force that a quark experiences just at the instant it is struck. It is also interpreted as a measurement of a linear combination of the electric and magnetic “color polarizability” in the nucleon.
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