Download Hadron Structure in Electroweak Precision Measurements by Nathan L. Hall PDF
By Nathan L. Hall
This thesis examines the γZ field contribution to the vulnerable cost of the proton. right here, by way of combining fresh parity-violating electron-deuteron scattering information with our present figuring out of parton distribution features, the writer indicates that you could restrict this version dependence. The ensuing building is a strong version of the γγ and γZ constitution features that could even be used to check numerous low-energy phenomena. such instances are mentioned during this paintings, particularly, the nucleon’s electromagnetic polarizabilities and quark-hadron duality.
By utilizing phenomenological details to constrain the enter constitution features, this crucial yet formerly poorly understood radiative correction is decided on the kinematics of the parity-violating test, QWEAK, to some extent of precision greater than two times that of the former top estimate.
A special research into to be had parametrizations of the electromagnetic and interference cross-sections exhibits that prior analyses suffered from the lack to properly quantify their version dependence.
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Extra resources for Hadron Structure in Electroweak Precision Measurements
Sample text
3 Model dependence makes up for ∼2 % of the total uncertainty, while the remainder (∼8 %) comes from the resonances. Sibirtsev, Blunden, Melnitchouk and Thomas To transform the resonances, SBMT use the SU(6) quark model wave functions to obtain an estimate for the ratio of the couplings of the isospin-1/2 resonances. Given the similarity between the weak and electromagnetic couplings, these ratios are set to one. The 3/2 resonances’ ratios on the other hand, are approximated as p (1 + Q W ) ≈ (2 − 4 sin2 θW ) using isospin symmetry and conservation of vector current.
As it turns out, the most important aspect of the γVZ calculation revolves around the γ Z structure function inputs. A complete knowledge of these structure functions would allow for a precise determination of the correction leaving little room for debate. This is not the case, however, for although the electromagnetic structure functions have been determined accurately in the crucial low-Q 2 , low-W 2 regions by experiments like E94-110 [57, 58] at JLab, there is no such data for the γ Z γZ γZ structure functions.
The estimated errors on the γ Z correction by SBMT, arising from the uncertainties in the fit parameters [14], are significantly smaller than GHRM’s [11]. 1 results in an error more than two and half times less than those in Ref. [11]. Carlson and Rislow Resonances in Carlson and Rislow’s structure functions are modified by a similar relation to Eq. 28). , Model II. 46 4 Structure Functions the MAID model of Ref. [30]. The transition amplitudes in Eq. 29) are calculated using the constituent quark model [12, 13].