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Constraining nucleon strangeness
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DOI：10.1103/PhysRevC.91.035205.png)
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摘要
En 中文
Determining the nonperturbative s (s) over bar content of the nucleon has attracted considerable interest and has been the subject of numerous experimental searches. These measurements used a variety of reactions, and place important limits on the vector form factors observed in parity-violating (PV) elastic scattering and the parton distributions determined by deep inelastic scattering (DIS). In spite of this progress, attempts to relate information obtained from elastic and DIS experiments have been sparse. To ameliorate this situation, we develop an interpolating model using light-front wave functions capable of computing both DIS and elastic observables. This framework is used to show that existing knowledge of DIS places significant restrictions on our wave functions. The result is that the predicted effects of nucleon strangeness on elastic observables are much smaller than those tolerated by direct fits to PV elastic scattering data alone. Using our model, we find -0.024 <= mu(s) <= 0.035 and -0.137 <= rho(D)(s) <= 0.081 for the strange contributions to the nucleon magnetic moment and charge radius. The model we develop also independently predicts the nucleon's strange spin content Delta s and scalar density < N vertical bar(s) over bars vertical bar N >, and for these we find agreement with previous determinations.
Keyword:
VIOLATING ELECTRON-SCATTERING
FORM-FACTORS
PROTON
SPIN
ASYMMETRY
MODEL
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期刊
IF:
3.4
论文数:
2.9W
被引数:
5.7W
机构
引用论文
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