Results of the measurement of the transverse and longitudinal cross-section for coincident electro-production of positively charged pions on protons measured in parallel kinematics at the invariant mass of W = 1125 MeV and at three fourmomentum transfers q 2 = −0.117, −0.195 and −0.273 GeV2 are presented. An axial-mass parameter of high accuracy was extracted from a preliminary analysis of the transverse cross-section within the Mainz effective Lagrangian model of the nucleon. The value supports the prediction of the chiral perturbation theory that pion-loop corrections effectively increase the value of the axial mass extracted from pion electro-production data relative to that from neutrino scattering. ; Opisuju se ishodi mjerenja poprečnog i uzdužnog udarnog presjeka za višestruku elektrotvorbu pozitivnih piona u paralelnoj kinematici.
The axial form factor of the nucleon from electro-pion production at low q2 ; Aksijalni faktor oblika nukleona iz tvorbe elektron-pion za male q2
1999-01-01
Fizika B : a journal of experimental and theoretical physics ; ISSN 1330-0016 (Print) ; ISSN 1333-9133 (Online) ; Volume 8 ; Issue 1
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
DDC: | 629 |
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