The Mudcat Café TM
Thread #59418 Message #1483783
Posted By: Rapparee
12-May-05 - 10:53 PM
Thread Name: BS: The Mother of all BS threads
Subject: RE: BS: The Mother of all BS threads
Well, yes, but....
Polarized deep inelastic scattering (DIS) experiments have shown that the quark spins account for only a rather small fraction of the nucleon spin, thus implying an appreciable contribution either from gluon spins or possibly from orbital angular momentum. Competing explanations exist for this result, in which the polarized glue G or the negatively polarized strange quarks lower the quark contribution to the nucleon spin. One way to solve this puzzle is to measure directly by studying, for example, polarized semi-inclusive processes, where the gluons enter in the initial state of the hard scattering sub-processes at lowest order. Since the main hard scattering sub-process in DIS is the virtual photo-absorption ∗q → q (q-event), the measurement of inclusive polarized structure functions, like g1(x), does not allow the separation of the various parton components, and does not give direct access to the spin-dependent gluon distribution.
Thus, with current knowledge we can only begin to appreciate spin-stabilized quark memory arrays.