학술논문
Threshold π0 photoproduction on transverse polarised protons at MAMI
Document Type
article
Author
S. Schumann; P.B. Otte; C.S. Akondi; J.R.M. Annand; H.-J. Arends; R. Beck; A.M. Bernstein; N. Borisov; A. Braghieri; W.J. Briscoe; S. Cherepnya; C. Collicott; S. Costanza; E.J. Downie; M. Dieterle; C. Fernández-Ramírez; A. Fix; L.V. Fil'kov; S. Garni; D.I. Glazier; W. Gradl; G. Gurevich; P. Hall-Barrientos; D. Hamilton; D. Hornidge; D. Howdle; G.M. Huber; V.L. Kashevarov; I. Keshelashvili; R. Kondratiev; M. Korolija; B. Krusche; A. Lazarev; V. Lisin; K. Livingston; I.J.D. MacGregor; J. Mancel; D.M. Manley; P.P. Martel; E.F. McNicoll; W. Meyer; D. Middleton; R. Miskimen; A. Mushkarenkov; B.M.K. Nefkens; A. Neganov; A. Nikolaev; M. Oberle; M. Ostrick; H. Ortega; P. Ott; B. Oussena; D. Paudyal; P. Pedroni; A. Polonski; V.V. Polyanski; S. Prakhov; G. Reicherz; T. Rostomyan; A. Sarty; M.H. Sikora; V. Sokhoyan; O. Steffen; I.I. Strakovsky; Th. Strub; I. Supek; L. Tiator; A. Thomas; M. Unverzagt; Yu.A. Usov; D.P. Watts; D. Werthmüller; L. Witthauer; M. Wolfes
Source
Physics Letters B, Vol 750, Iss C, Pp 252-258 (2015)
Subject
Language
English
ISSN
0370-2693
1873-2445
1873-2445
Abstract
Polarisation-dependent differential cross sections σT associated with the target asymmetry T have been measured for the reaction γp→→pπ0 with transverse target polarisation from π0 threshold to photon energies of 190 MeV. The data were obtained using a frozen-spin butanol target with the Crystal Ball / TAPS detector set-up and the Glasgow photon tagging system at the Mainz Microtron MAMI. Results for σT have been used in combination with our previous measurements of the unpolarised cross section σ0 and the beam asymmetry Σ for a model-independent determination of S- and P-wave multipoles in the π0 threshold region, which includes for the first time a direct determination of the imaginary part of the E0+ multipole.