Poncaré Invariant Models and the Non-Conservation of Helicity in Hadronic Physics

Details Poncaré Invariant Models and the Non-Conservation of Helicity in Hadronic Physics Poncaré Invariant Models and the Non-Conservation of Helicity in Hadronic Physics

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprx10001m&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Recent experimental work at Jefferson Laboratory and Mainz have used a variety of interesting new techniques to extract information about the nucleon elastic form factors G_E,M or F_1,2. The momentum transfers are sufficiently high Q^2>1 (GeV/c)^2, so that models of constituent structure must account for relativity. We focus on recent work (nucl-th/0201021) in which a relativistic constituent quark model is found to reproduce the recent data regarding the ratio of proton form factors, F_2(Q^2)/F_1(Q^2). We show that imposing Poincaré invariance leads to substantial violation of the helicity conservation rule, as well as an analytic result that the ratio F_2(Q^2)/F_1(Q^2) ~ 1/Q for intermediate values of Q^2. The possible implications of this model for other form factors and hadronic reactions are discussed.

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