Journal ArticleDOI
Elastic Scattering Measurement of the Negative Pion Radius
E. B. Dally,J. M. Hauptman,J. Kubic,D. H. Stork,A.B. Watson,Z. Guzik,T.S. Nigmanov,V. D. Riabtsoy,E.N. Tsyganov,A.S. Vodopianov,Andrew Beretvas,A. Grigorian,J. C. Tompkins,T.E. Toohig,A. A. Wehmann,J. A. Poirier,C. A. Rey,James T. Volk,P. D. Rapp,P. F. Shepard +19 more
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TLDR
In this paper, a new measurement of the elastic scattering of 250-GeV/c negative pions by electrons provides form-factor results from 0.0368<q2<0.0940 (GeV /c)2.Abstract:
A new measurement of the elastic scattering of 250-GeV/c negative pions by electrons provides form-factor results from 0.0368<q2<0.0940 (GeV/c)2. These measurements determine the mean square pion radius to be 〈rπ2〉=0.439±0.030 fm2 or 〈rπ2〉12=0.663±0.023 fm. Comparisons are made with previous elastic-scattering experiments as well as with results obtained from electroproduction experiments, e+e− annihilation experiments, and phenomenological analyses.read more
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Journal ArticleDOI
Chiral perturbation theory to one loop
J. Gasser,Heinrich Leutwyler +1 more
TL;DR: In this article, the low energy representation of several Green's functions and form factors and of the na scattering amplitude are calculated in terms of a few constants, which may be identified with the coupling constants of a unique effective low energy Lagrangian.
Journal ArticleDOI
Chiral Perturbation Theory: Expansions in the Mass of the Strange Quark
Jürg Gasser,Heinrich Leutwyler +1 more
TL;DR: In this paper, the authors construct the generating functional of U(3)×U(3), which allows them to calculate the Green functions up to and including terms of order p4 (at fixed radio m quark p 2 ) in terms of a few coupling constants which chiral symmetry leaves undetermined.
Journal ArticleDOI
A measurement of the space-like pion electromagnetic form factor
Salvator Roberto Amendolia,Metin Arik,B. Badelek,G. Batignani,G. A. Beck,F. Bedeschi,E.H. Bellamy,E. Bertolucci,D. Bettoni,Halina Bilokon,G. Bologna,L. Bosisio,C. Bradaschia,Marco Budinich,A. Codino,Mauro Dell'Orso,B. D'Ettorre Piazzli,M. Enorini,Fabrizio Fabbri,F. Fidecaro,Lorenzo Foà,Ettore Focardi,S.G.F. Frank,A. Giazotto,Mario Giorgi,M. G. Green,J. Harvey,G.P. Heath,Murrough Landon,Paolo Laurelli,F. Liello,G. Mannocchi,P. V. March,P.S. Marrocchesi,A. Menzione,E. Meroni,E. Morini,Luigi Moroni,Edoardo Milotti,P. Picchi,Francesco Ragusa,Luciano Ristori,L. Rolandi,S. Sala,C.G. Saltmarsh,A. Saoucha,L. Satta,A. Scribano,P. Spillantini,A. M. Stefanini,D. Storey,J. A. Strong,R. Tenchini,Guido Tonelli,G. Triggiani,W. von Schlippe,E. Van Herwijnen,A. Zallo +57 more
TL;DR: The pion form factor has been measured in the space-like q 2 region 0.014 to 0.26 (GeV/c ) 2 by scattering 300 GeV pions from the electrons of a liquid hydrogen target.
Journal ArticleDOI
Low-energy expansion of meson form factors
Jürg Gasser,Heinrich Leutwyler +1 more
TL;DR: In this article, the authors calculate the corrections to various low-energy theorems concerning the behavior of pseudoscalar meson form factors near t = 0, including the Ademollo-Gatto theorem, Sirlin's relation between the Kl3 form factor ƒ+Kπ(t) and the electromagnetic form factors, and Dashen-Weinstein relation.
Book ChapterDOI
Introduction to Chiral Perturbation Theory
TL;DR: In this article, the basic concepts of chiral perturbation theory are discussed and a general introduction to the empirical and theoretical foundations which led to the development of Chirr-Perturbation Theory is provided.
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