SLAC E155 A PRECISION MEASUREMENT OF POLARIZED STRUCTURE FUNCTION g1 OF PROTON AND DEUTERON
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چکیده
The E155 experiment at the Stanford Linear Accelerator Center (SLAC) has performed a precision measurementof the proton and deuteron spin structure function g 1 using deep inelastic scattering of polarized electrons on polarized 15 NH 3 and 6 LiD. g d 1 (x)dx = 0:034 0:002(stat) 0:005(syst) at an average Q 2 = 5 GeV 2 .These preliminary results are in reasonably good agreement with previous data. A large range of extrapolations can accomodate the singular behaviour of the structure function at low x , calling into question the usual methods to extrapolate to x = 0. The softer behaviour of the Bjorken sum rule allows us to test it.
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تاریخ انتشار 2007