کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1854114 | 1035693 | 2008 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The spin of the proton
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
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چکیده انگلیسی
The twenty years since the announcement of the proton spin crisis by the European Muon Collaboration has seen tremendous progress in our knowledge of the distribution of spin within the proton. The problem is reviewed, beginning with the original data and the suggestion that polarized gluons may play a crucial role in resolving the problem through the U(1) axial anomaly. The discussion continues to the present day where not only have strong limits been placed on the amount of polarized glue in the proton but the experimental determination of the spin content has also become much more precise. It is now clear that the origin of the discrepancy between the experiment and the naive expectation of the fraction of spin carried by the quarks and anti-quarks in the proton lies in the non-perturabtive structure of the proton. We explain how the features expected in a modern, relativistic and chirally symmetric description of nucleon structure naturally explain the current data.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Particle and Nuclear Physics - Volume 61, Issue 1, July 2008, Pages 219-228
Journal: Progress in Particle and Nuclear Physics - Volume 61, Issue 1, July 2008, Pages 219-228
نویسندگان
A.W. Thomas,