Download e-book for iPad: Age and area. a study in geographical distribution and by J. C. Willis

By J. C. Willis

Age and zone. A examine in geographical distribution and foundation of species This ebook, "Age and area", via J.C. Willis, is a replication of a booklet initially released earlier than 1922. it's been restored by means of people, web page via web page, so you might take pleasure in it in a kind as just about the unique as attainable.

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55) where one has the isovector part of one of the electromagnetic form factors in Eqs. 50) when A = 0 and one of the charge-changing weak form factors in Eqs. 54) when X = = !. Of course, when discussing charge-changing weak interaction processes it is also necessary to consider axial-vector currents as well as vector currents. The analogous operators for multipole expansions of the axial-vector currents will be denoted with a "5" superscript" F± (q)= cJ5 v/2Ji1 + 1 (_)rs _Mrs ( -MTs Tf F± Tl LJh(q) -- v/2Ji1 + 1 (_)rs _Mrs ( -MTs F± (q)= EJ, + V'2Ji1 + 1 1 F'_t4(q) - V'2Ji + 1 (_)rs Mrs ( -MTs T!

Dispersion corrections to NC eN amplitudes have received less theoretical attention. and there exists no experimental information in this case. The authors of Ref. [Mar84] have estimated hadronic contributions to the Z°-'_, box amplitude in atomic PV by including only nucleon intermediate states. 0006. The corresponding contributions to R r=° and R r=l are on the order of a few tenths of a percent. No study has been made of many-body contributions, which might result in enhancements over the one-body scale similar to those seen in PC scattering from carbon.

For the axial-vector corrections, on the other hand, R_)(1-quark) _ few percent for neutrino scattering, significantly smaller than for electron 39 scattering where R_)(1-quark) ,,- 25-50°A, due to the logarithmic enhancements and treelevel suppression factors mentioned above. This result has important consequences for the interpretation of observables containing (HIJ_,'_c H). 0113 for 3In = 100 GeV and rnt = 140 GeV, where the values have been extracted from Ref. _lar90] and where the uncertainties include estimated uncertainties in hadronic contributions (see below).

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Age and area. a study in geographical distribution and origin of species by J. C. Willis


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