What can we learn about the ratio by using space-like, time-like data and dispersion relations?

✍ Scribed by Rinaldo Baldini; Cesare Bini; Paolo Gauzzi; Marco Mirazita; Matteo Negrini; Simone Pacetti

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 201 KB
• Volume: 755
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2005.03.131

✦ Synopsis

Recent experimental data on the space-like and time-like form factors of the proton are analyzed by means of a dispersive procedure. Both the space-like data, from Jlab and the time-like ones from FENICE at ADONE, DM2 at DCI and E835 at Fermilab are unexpected, for instance all these results are inconsistent with the low energy scaling. In light of these good and bad news, we try to gain some information about the properties of the ratio G p E (q 2 )/G p M (q 2 ), by using a dispersive approach.